Weekly Report for Week
Ending April 22, 2004
The LIGO Executive
Committee Agenda for Monday April 26, 2004
will be:
(Meeting time: 10:30 am Pacific Time)
- Announcements
- LSC Issues
(Saulson)
- Comments on Weekly
Report
- WBS 1 LIGO I
Construction (Lindquist)
- Field Change Orders/Contingency Liens/Change Requests
- WBS 2 LIGO Lab
Operations
- Administration (Lindquist)
- Sites (Raab, Zucker, Shoemaker)
- Detector (Whitcomb, Coyne)
- Campus Research Facilities (Weinstein (40 Meter), Libbrecht
(TNI), Ottoway (LASTI))
- Data Analysis and Computing (Lazzarini)
- WBS 3 and 4 Advanced R&D and LIGO II
(Shoemaker)
- CHANGE
CONTROL BOARD/TECHNICAL REVIEW BOARD SESSION AS NEEDED
Special Announcements:
Weekly
Report Highlights
LSC Issues (Saulson)
No report this week.
LIGO I
Construction/LIGO Laboratory Administration (Lindquist)
Status of LSC/MOU Research
Updates and Program Reports (Petrac)
No report (leave).
LIGO Weekly Site Telecon
(Lindquist)
There was no site teleconference scheduled Thursday, April 22,
2004.
The list of current actions revised
to reflect
the status of open actions assigned through the last update (March 4,
2004) may be
found at ACTION
LIST.
PROPERTY
MANAGEMENT (Chargois)
From: Ed Chargois
<chargois_e@ligo.caltech.edu>
-
Provided assistance to the Detector Group (L. Jones) with
packing and shipping of twenty (20) BNC male vacuum, non-magnetic RG
174 Connectors to LLO (K. Ryan). Account Number P204324).
-
Provided assistance to MIT (K. Bayer) with the shipment of one
(1) LCD Projector ins support of the LDC Conference beginning 23 April
04. Account Number P204254.
-
Provided assistance to the Detector Group (K. Mailand) with
the disposal of 300+ ft. of soft copper tubing and a caster mounted
platform. No cost to the LIGO.
-
Prepared a Purchase Requisition to Air Courier Dispatch for
the return delivery of four (4) Laptop computer from LLO
that supported the LSC.
-
Provided R. Brambila with a past due Federal Express Invoice
(1-608-10715) This shipment is charged to LHO Account Number
LIGO.HAN 2.1 NSFLIGO.FY02OF.
DOCUMENT
CONTROL CENTER (Turner, Mak)
>From:
Linda
Turner - turner@ligo.caltech.edu>
Web pages
for the DCC give simple how-to's for document numbering, easy access to
the latest on-line documents, and search capabilities for the DCC
database. Take a look.
. .
ACCOMPLISHMENTS
> From: Cleveland Mak <mak_c@ligo.caltech.edu>
ACTIVITY
04/22/04
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Press here to access
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COST
SCHEDULE CONTROL SYSTEMS (Cunningham, Brambila, Kaufman, Salone)
From: Esther Cunningham
<esther@ligo.caltech.edu>
Press here for
ACCOUNTS
PAYABLE HISTORY DATA.
From: "Brambila, Ruth"
<Ruth.Brambila@caltech.edu>
- Completed through the new subcontract for Planning Systems,
Inc. Prepared the package for routing of approvals and federal
expressed the purchase order to the vendor.
- Revised the MIT package on change order #23 to include the
internal modification transferring funds funds as requested and to
increase the contract value to include the remainder of the budget for
FY2004.
- Working on a new change order for Triad for the renewal of
support.
- Reconciled 38 pcard transactions for the period ending April 19,
2004 which totaled $55,998.91.
- Received a refund check from Lawrence Berkeley National Lab for
$1,000.00 for overpayment covering the period of 11/20/1998 thru
9/30/2001. Deposited it to the current poeta on this subcontract.
From: Gina
Salone
<gsalone@ligo.caltech.edu>
- Modifying Planning System Inc (PSI) Contract
- Working with Northrop to resolve invoice problem
- Assisting Larry Jones and Mike Smith with Contracts/Purchase
Orders
- Working with Florence to correct charges concerning Excel
contract, which Intel’s moving money from one poeta to another.
From:
Florence Kaufman
<fkaufman@ligo.caltech.edu>
- Revised the March Visitor Program report for new information
received from Cindy regarding cancelled visits. The report for
March is now posted on the staffing site.
- Reviewed CCB Watch List prepared by Dennis Coyne and made some
suggestions.
- Responded to Dennis Coyne's request for clarification of
Caltech's Equipment Fabrication Policy.
- Noted that corrections required for reallocation of payroll for
Ed Maros had not been done correctly and requested corrections.
The allocations have now been corrected.
- Prepared two Cost Transfers per Gary's request to transfer costs
to his new Award.
- Prepared a report as of the end of March for the DIA Award for
Vern Sandberg.
- Requested Expenditure Type Correction for travel expenditures in
the Visitor Program that had been classified to an inappropriate
Expenditure Type resulting in unwarranted Indirect Cost.
Financial reports can be
found at:
http://docuserv.ligo.caltech.edu/~fireport.
SUBCONTRACTS
MANAGEMENT (Petrac, Jasnow)
From: irena@ligo.caltech.edu (Irena Petrac)
From: Ed Jasnow <jasnow@ligo.caltech.edu>
- The contract for the Advanced LIGO actuators was executed
yesterday and Fedex'd to the contractor, PSI. The contract is
worth $148,000, reflecting the reductions directed by the Change
Control Board.
- The fully executed contract for the Advanced LIGO optical
coating with LMA-Virgo was handed to Jean Marie Mackowski who is
visiting Caltech from France.
- Efforts have begun to initiate a service contract with Lightwave
Electronics, Inc., to perform repairs on three lasers at LHO.
This repair will include the installation of new diodes.
SUPPORT (Baldon, Lloyd,
Tischler)
>Irene Baldon
- A great portion of my time has been tied-up with working with
Raindance Reservationless Conferencing, selected as the new replacement
for AT&T Teleconferencing, adapting it to LIGO's needs, setting up
cards and pins for frequent users, distributing these, and cancelling
AT&T standing calls as users become comfortable with
Raindance. Raindance will be charging LIGO $0.24/minute/caller as
opposed to AT&T charging LIGO $1.00/minute/caller. As
significant savings to LIGO. At the moment there are nineteen
(19) Card/Pin holders and I have a total of six (6) assigned to me for
one-time users.
- Processed the paper work for one (1) new/revised trip.
There are seventeen (17) trips in various stages of completion before
ticketing can be done and/or paper work completed. PLEASE
NOTE: The 2004 SURF travel has started and this year I'm
currently working on twenty-five (25) travel arrangements, including
domestic and foreign.
- Completed fourteen (14) Expense Reports and there are twenty-six
(26) reports yet to be done. I continue to contact travelers who
have outstanding Expense Reports (more than one (1) month old) to ask
for their cooperation in sending me their receipts so that these can be
closed in a timely manner. Presently is are nine (9) reports more
than 30 days old.
- Reconciled eight-five (85) P-Card items for the month ending
April 15th. Reconciled and close one (1) P-Card for a LIGO
tranveling outside the U.S. and unable to do his own. I continue
to work closely with Terry Gunter and LIGO/Hanford personnel in
acquainting them with P-Card procedures and reconciling.
- Continued to cover the Project Office, Barry Barish's and Donna
Tomlinson's Office when called upon. Worked on the preparation
and distribution of the Travel/Vacation Itinerary for April 12, 2004.
>Dorothy Lloyd
- Jim continued with data entry in the LIGO database and helping
out in the DCC.
>From: Ryan Tischler <rtischle@ligo.caltech.edu>
-
PAC16 details, Travel issues, Roster Photo Project.
ADVANCED LIGO (Cost
Schedule
Control Systems) T. Frey
From: Thomas Frey <tfrey@ligo.caltech.edu>
For list of documents
that are being used to develop Adv.
LIGO Cost and Schedule, see
http://www.ligo.caltech.edu/~tfrey/Cost_MTG_082002/
Executed overall
changes to Adv LIGO baseline. These tasks include the following:
-
Added / corrected
inter-project logic links.
-
Task code
assignment clean up.
-
Task description
clean up.
-
Integration of the
revised Adv LIGO Summary schedule.
Development of the Advanced LIGO Project Controls Guidebook continues.
Project Web Site for
posting schedule and progress related data continues to be updated with
the latest and greatest.
Reports
(Lindquist)
LIGO Video--Tom
Lucas (Lucas Productions) has been at Caltech interviewing
people. Thanks for your support. Tom is building the "plot
line" for a 20-25
minute NOVA type video on LIGO under a Grant from the NSF. Tom
will
be traveling from Caltech to the Hanford site tomorrow to participate
in the
"star party" scheduled for April 24.
Change
Control/Contingency (Lindquist)
There are no open change requests.
Human
Resources (Akutagawa)
From: Cindy Akutagawa
<cindy@ligo.caltech.edu>
- Various personnel/payroll /HR related work.
Quality/Safety (Tyler)
>From: Bill Tyler <tyler@ligo.caltech.edu>
No report.
LIGO Hanford
Observatory (LHO) and Interferometer Operations
(Raab)
Summary of
Commissioning Activities at LIGO Hanford
Observatory (Sigg)
Site Activities
Keita Kawabe has joined the LIGO Hanford staff as a scientist.
We welcome him to the lab, and his family to Washington.
Two nights
of public outreach began last Saturday.
Spring into Astronomy (Apr 17), saw about 90 visitors to the lab for a
talk by Fred, stargazing with
Tri-City Astronomy Club telescopes, and a video on cosmology.
National Astronomy Day (Apr
24) should attract still more visitors, and include solar astronomy and
tours of LIGO.
Dewar
bonks, produced in CP2's LN2 tank, remain a daily unlocking source
for both Hanford interferometers.
H1 Activities
The common mode path was switched to REFL2.
In order to do this, an ND filter had to be added to avoid saturations;
REFL2 can't be used
with too much light.
The PSL laser swap
and layout upgrade has been essentially completed. Eleven watts out of
the laser lands
7.5W on the mode cleaner. Closing tasks are listed in the linked elog.
The FSS was tempermental in light of the new PSL; needed adjustment.
Shot and dark noise measurements
were made of the non-resonant sideband REFL photodiode.
The 4k antisymmetric port has its own doll's
house, with photo.
The lucite enclosure, when purged, reduces dust-induced glitches on
AS_Q by an order of magnitude.
With burst analyses impacted for some 10-20h after entry, we'll want to
stay out of the enclosures during
science runs.
WFS1 optical path was modified.
An ND filter installed
in reference cavity detector path.
H2 Activities
The hardest button to button : H2 wouldn't readily go into CM mode for
several days, in part
due to script problems, part due to bad alignment. Problem solved
with patient
and careful checks.
DAQ
New LSC
code was installed on H1.
LIGO Livingston
Observatory (LLO) and Interferometer Operations
(Zucker et al)
ANNOUNCEMENTS:
Gary Traylor has agreed to take on the role of Lead Operations
Specialist at LLO. Gary's expertise, insight and leadership have
become legendary at LLO, and we're fortunate that he is taking on this
added responsibility.
On a more somber note, after much reflection Joe Langdale has decided
to pursue further studies in computer science, and will be leaving LLO
in May. We're grateful for all Joe's hard work on the interferometer
and vacuum system and the many intense operator shifts under his belt
(not to mention the poboys), and wish him well in the future.
Public Outreach (Bonnie
Wooley, Katrina Carter, Joe Giaime, and MZ)
Bonnie and Katrina hosted two enthusiastic school groups this week for
site tours, hands-on science activities, and BTE painting.
Joe MC'd the annual meeting of the Livingston Parish Economic
Development Council at the LLO site on Wednesday night. After his
lecture, the guests retired to an outdoor dinner with live music under
the LLO pavilion. Among the guests were many of the local
businesspeople who played key roles in site construction, some of whom
had not visited since it was a pine forest. Many opnely expressed
their gratitude and pride, and thanked LIGO for its
contribution to the community.
Mike hosted separate half-day visits by John Hunt, a senior advisor in
the Physics Division at NSF, and by Richard Matzner, chair of the LIGO
Program Advisory Committee (PAC). Both were interested in in-depth
reports on the progress of commissioning, HEPI, and preparations for
our next set of science runs; although they've each heard numerous
presentations, seeing the installation and commissioning in progress
was far more illuminating.
Commissioning Overview
(Zucker)
HEPI continues at full steam. Piping contractors are now done with both
endstations and both X and Y ends are wet and pumping. Corner
station piping has progressed to include connections to all the BSC's
and HAM4, up to the final hookup (to be filled in after actuators are
complete). The installation of the first HAM actuator (on HAM4)
went off very smoothly on Friday, despite the scrutiny of a film crew
looking over Gary and Harry's shoulder. We now feel confident in
getting to an installation pace of one actuator per day, as we had
hoped. At this writing three of the four HAM4 actuators are in place.
HEPI commissioning is now in full swing at the X end. Sensors and
actuators are now all active and signals coming through to the DAQ
system. This afternoon the crew commanded a tentative gentle move to
the hydraulic actuators. The payload responded, though not quite as
planned. More work to do, but bottom line: "Eeet eees ALIVE!!!"
We installed the TCS viewport in a very short 1-day vent of the Y
beamtube manifold; since we only vented the manifold, no interferometer
components were exposed and the pressure has already recovered to a
compatible level. The gates will be reopened Monday.
The regeneration of the third of our four cryopumps (CP1) went well,
although a fault in the exterior gas handling system is preventing
high-temperature bake. This should not affect post-regen performance
however.
Installation of the IO WFS hardware required substantial revision to
the rack wiring; this is now finished and under test (see below).
More cleanup on the X end RFI retrofit wiring continues. We are waiting
on some replacements for cables which were discovered to be
incompatible (although miraculously the interferometer ran just fine).
L1 Commissioning (Frolov)
Andri and I made measurements of the effect of prc offset on the full
ifo lock. The effect of the prc offset on the sideband is similar to
the effect we saw in the PRM lock. We also saw an increase of ~15% in
the DARM optical gain.
I worked witn Rusyl, Garry, and Harry on the TCS viewport
installation. I contacted M.Smith and K.Ryan to get the drawings
and instructions, and checked with Rus that we were ready for the
installation. The section of the Yarm was gated off and vented by Rus,
the viewports were installed this morning by Garry and Harry.
I am preparing to recommission the IO WFS servo. So far I copied the
digital filters from the old MC WFS filter bank to the new one. I made
a new MC WFS script to zero the RF and DC offsets script to reflect the
change in the readout.
LLO Seismic retrofit (Rich
Abbott)
- Electronics commissioning is well under way at the X end
station. So far, the signal sensing chain has been checked out
and is fully functional. The actuation chain has been checked out
up to the hydraulic control valves, but the cable are not yet attached.
- The actuators in the X end station have been taken out of the
bleed mode. The bleed mode is used to remove trapped air from the
system. There are a few minor code issues that must be looked
into, but the system is quickly nearing the system ID phase.
Within the next few days, we will be running the system ID process.
- The hydraulics in the Y end are running on the pressure control
servo. Final debug of that was accomplished on Wednesday.
- The actuators for 3 of the 4 piers on Ham 4 have been installed,
and the 4th pier will probably be completed by the end of the week.
- The piping installation in the vertex has about 6 more weeks of
work. The work is slower than anticipated due to a reduction in
the number of installers, but they are keeping up with the rest of the
HEPI development schedule. The installation task is on budget at
present.
Oddvar Spjeld adds:
- completed assembly of four HEPI housings for the first HAM chamber
- follow-up of installation: preparing for next assembly batch
- follow-up of flex hoses manufacturing: partial delivery not
possible
- ordered and received revised HAM attachment shims from Southern
Ent.
- fit-check of HEPI housing - HAM pier: one attachment hole is
off-centered
- preparing for transfer of the Solid Works server to Caltech (1-2
weeks)
Safety and security (Rich
Riesen)
- We had CPR/first aid/AED(defibrillator) training this reporting
period. 17 people have been certified by the American Red
Cross. There will be another class next week for those who
couldn't make this weeks training.
- Continuing work on site safety procedures and S.O.Ps.
- Found no safety concerns during my weekly site tour.
- Completion of the safety requirements punch list for the HPLF
should be early next week.
HPLF and L1 Commissioning
(Amin)
HPLF:
According to IPG's VP of Operations, IPG is still projecting an April
27th ship date for the 100 W laser. We are expecting them to send
an installation technician to initially unpack and validate the the
laser. Once this is complete, LLO has 30 days to characterize the
laser and make certain it complies to our requirements.
Additionally, a group of Russian scientists from IAP Nihzy Novgorod
will be arriving to begin conducting high power laser tests. Further
information and high power lab progress will be noted as it becomes
available.
2k Faraday Isolator:
UF now has all optical pieces and mounts constructed. We await the
arrival of EOTech's Faraday rotator. It appears that we are still
waiting on Northrop-Grumman to grow a crystal that meets LIGO
requirements.
PSL:
I am continuing to look into the occasional RefCav lock losses. So far
I have tested the 80 MHz VCO and determined that there appears to be a
soft limit for sending the FSS into oscillation when an external DC
offset of 0.28 VDC is applied. Also, visible and occasionally extended
spikes in the FAST portion of the FSS can be seen when switching on and
off this external DC signal. I am now looking into the likelyhood that
the MC servo is feeding a non-zero VDC to the VCO. I have not
determined the "how this would happen" yet.
The NPRO appears to be quite reliable for the past couple of
weeks. No major problems for concern, yet.
Photon Calibrators:
Continuing to be supporting cast to D. Lormand in setting up the photon
calibrators. We will be testing the second laser later today for
elliptical polarization.
General Computing (Roddy)
- Current bandwidth usage can be seen at
http://teche.ligo-la.caltech.edu/mrtg/LLO-Router/130.39.245.1_1.html
- Archived bandwidth usage can be seen at
http://teche.ligo-la.caltech.edu/mrtg/archive/ under the dated folder
for the week of interest.
- Spent a lot of the last week working with a RAID disk system
which the user home directories will once again be moved to. I
replaced all of the drives in it since we had two drive failures in it
and the drives were out of warranty. This also increased the
capacity to > 1 TB at RAID 5. I spent a good bit of time
setting it up and then used rsync to copy the home directories to
it. Due to the limitations of a UFS file system which is >
1TB, there is a 1 million file limit. We have > 1 million
files in the home directories so at 182 GB of files, Solaris reported
that the disk was full. df -h reported only 182 GB of 1.09 TB
used, but df -o i reported all of the inodes used. I then tried
to create a new file system with a greater inode density. Solaris would
not let me. After much work with format, newfs, and reading on
Sun's web site, I discovered the limitations on a 1 TB disk. In
addition to the UFS limits, a disk with >= 1TB does not use the
standard vtoc to format the disk. It uses an EFI format to create
the slices. Last night when I left I recreated the hardware RAID
with RAID 0+1 which should reduce the capacity of the RAID to ~800
GB. This should allow Solaris to work with the disk more easily
and also provide more redundancy in the RAID. Once again tonight
I will start rsyncing the files to the new disk. It should be
done by morning so that I can start migrating the user directories to
it.
- Tried last night to install another switch in the new
building. This is needed since we are using all of the ports in
the existing switch and we need more. Unfortunately the switch
would not even fit in the rack (the rack is half of the standard rack
depth) so I have ordered a switch from Dell that will fit.
- Renewed all of the Matlab license maintenance contracts. I
was ~$4900 for GC and ~$1100 for CDS. The individual licenses for
people's laptops cost a fortune every year.
- started on a script to change the group ownership of everyone's
files so that once we change the staff gid I can then change the
files. This script needs to be a bit more intelligent than just
chown -R since some files may intentionally have a different group than
the owner and we should not change that.
Data Analysis (Yakushin)
LDAS admin:
- Working out replication procedure in the new version of DB2.
Data analysis:
- Generated and tested with waveburst the first set of LIGO-TAMA
high-frequency MDC frames.
- Generated but have not tested yet gaussian all sky waveforms on
the whole S2.
- Working on generating ZM and BH merger MDC frames.
AdL Optics Modeling and S3
Analysis (Franzen)
- I have found several problems with the Melody v.2.1 mode cleaner
model. The thermal lensing in the HR coatings is one order of magnitude
too strong compared with the corresponding results using the Winkler
formula. Furthermore, the astigmatism of the beam leaving the mode
cleaner appears to be too large as well and independent of power. I am
presently trying to understand the reason for these discrepancies. I
have reported these problems to Amber and Ray at Stanford.
- I am writing a short note on my S2 WaveMon veto work.
CDS Controls (Chethan
Parameswariah)
- Working on the HEPI Watchdog. Added HEPI ETMX input
position/Geo and STS sensors and output DAC epics channels to the frame
builders to be recorded by frames.
- Tested running HEPIEY and HEPI2 processor with all the cards in
the crate.
- Looking at the disk space status on the Frame builders to add the
long list new HEPI channels.
CDS support (Ash Khan)
- Helping Russ and Rolf in relocating the IOO WFS signals from
l1iool0 to l1ascauxl0.
- Documenting the DAQ/RFM changes per HEPI installation.
Detector/Technical
Support (Coyne)
Seismic Upgrade Project
CDS
see also CDS meeting minutes in the commissioning
archives:
CDS Software
(Rolf Bork reporting)
- Installed end station code at LHO to support new acquisition
photodiode.
- Code to use new Freq. Devices DAC modules now installed in both
LHO4K end station controllers.
- Continued support of Hepi at LLO.
- Alex at LHO to install latest ASC w/IO WFS.
- Wrote a new ICS110B ADC initialization driver to replace the
commercial software drivers we have been using over the years. We
tested this on LHO2K mid-station ADCU (the one that has been having
problems with bad data in some channels when running in DMA mode) and
the problems appear to have gone away. Dave is now testing this code on
the other DAQ systems. If testing is successful, we will put this new
driver in all of our other systems that use ICS110B ADC modules.
- Working on VME drivers for the new 2.2GHz Pentium VME processors.
CDS Hardware
(Jay Heefner reporting)
- LLO EMI Retrofit: Continued ordering and receiving of cables and
components for LLO upgrade.
- Output Mode Cleaner: Continued working with Peter, Bill and
Virginio.
- Digital MC WFS: Completed drawings and cross connect list for the
LLO digital mode cleaner WFS. Sent copies of drawings to LHO for mark
up.
PSL
(PeterKing)
- Flavio and I have breadboarded a new shunt board in an attempt to
understand the notch-like feature observed at approx. 2.6 MHz. In
addition a bias circuit for the IRF9540 HexFET was fabricated to
characterise the HexFET.
OMC
(PeterKing, Bill Kells, Virginio Sannibale, Lee Cardenas)
- After receiving most of the machined parts for the OMC vacuum
chamber a number of mistakes were noticed, which led to a few
on-the-spot modifications. The most obvious was an O-ring groove
that was cut 0.050 in. too deep. There were a few other minor
machining errors that were readily rectified. All parts made it
in time for a vacuum bake over the weekend. The exceptions being
the Brewster window mounts due to a problem encountered with the CNC
mill.
- What was obvious whilst hanging the cavity is that what I thought
was an okay design on paper is in reality quite hard to assemble and in
one case was not practical. The OMC is now held in place with a
spring rather than a pair of screws. At least mechanically there
are no major fitting errors.
- The OMC has been locked to an NPRO laser with some cobbled
together electronics. The vacuum chamber is currently undergoing
a pumpdown test.
Thermal Compensation System (TCS)
(Mike Smith)
- Purchase Reqs for 4 TCS systems ( LHO 2k and LLO 4k) are being
placed.
- Acousto-optic modulators for relative intensity control were not
ordered. A new design for DC laser power control using rotatable,
coated Brewster's angle polarizers is being developed.
- A preliminary plan view layout of the TCS for LLO was sent to
Valera.
Optics Analysis
(Mike Smith)
- Revision is complete for the paper to be submitted on "Direct
Measurement of Scattered Light Effect on the Sensitivity in TAMA300",
by Takahashi, Arai, Kawamura, and Smith.
Optical Contamination Cavities
(Lee Cardenas, Liyuan Zhang
)
OTF Lab. (W. Bridge)
The (21) pieces of the new twisted, shielded, teflon cables are
under test. We are taking ring down and beat frequency
measurements as well as the RGA of the chamber every day. NO CHANGE
Absorption Test Measurement
prototype in progress The
sapphire substrate PINK color from Lyon, France. (314 mm Dia. X 131mm
thick.) still inside the enclosure and the latest scan performed for
absorption give us a result of ~25 ppm. The substrate is in
standby for further measurements.
The 80mm sapphire cube went for scan and we found extremely non-uniform
surface. We stopped the scan.
The fabrication of the rods for the enclosure is in STANDBY. We
have received (3) sapphire substrates 3" Dia x 1.0" Thick to be
tested. New modified holders is in progress for these mirrors.
We have encounter with a situation with our 30 watt laser. We
found a water leak on the power amplifier box. We contacted
Quantronix and advise us to open the box and check for the o-ring
condition. We found that the screws were very loose so we tighten
them up ands check again for leak and it did hold for a day then it
started leaking again. Now we decided to open it up and check the
o-ring and found none. We decided to change for new o-ring.
Please see Dr. Zhang's report.
Scatterometer system in standby
OTF Lab at Lauritsen ROOM 38:
NO CHANGE.
Cavity #3: The cavity is locked and we are taking ring down and beat
frequency measurements every day as well as the RGA for the chamber.
Cavity #2: Test cavity optical set up in standby
Misc... tasks
different fixture to accommodate sapphire substrate samples are in
progress.
40 Meter
Interferometer (Weinstein)
Commissioning (Miyakawa, Vass,
Ward, Kawamura):
- Work towards implementing a full LSC
system for locking the dual-recycling interferometer is progressing
rapidly; see below.
- The mode cleaner servo is performing
less robustly. Osamu thinks that the demod phase has somehow changed
(maybe when RF cabling was done in that rack a couple of weeks ago),
and will re-tune the demod phase with different-length cables.
- Rob continues to study the deep
complexities of the front-end LSC code, with the aim of modifying it
for dual recycling.
- Seiji is writing a technical note
summarizing his studies of dual-recycling lock acquisition, in which he
concludes that dither-locking MICH can provide a robust path towards
lock of the full IFO.
PSL
(Miyakawa, Vass, Ward):
- Our MOPA continued to misbehave in new
and strange ways. Ever since Steve & Osamu turned down the current
on the NPRO (to reduce the overheating), the MOPA power monitor has
been fluctuating *upward* from 11 watts up to 13 or 14 watts. When that
happens, the mode cleaner falls out of lock.
- Steve and Rob obtained an NPRO heat
sink from the shop (ordered by Peter King weeks ago) and installed it
on the NPRO in our MOPA laser. They also removed the cover from the
NPRO. The TEC temperature monitor fell to 1 volt, the MOPA power
stopped fluctuating, and the mode cleaner held lock for hours. Late
last night, there was some more MOPA power fluctuation, but it hasn't
happened since.
- In the next few days, we will close
the MOPA cover (it is now propped open a few inches) and declare
victory on the heating problem.
- However, there are still problems with
the FSS. There appears to be a big oscillation (3MHz) in the FSS fast
PZT loop which is limiting the gain and causing the mode cleaner to
fall out of lock. Osamu burned the card out while testing it, by
plugging it into a bad extened board. Ben fixed the FSS board this
morning, brought over a new extender board, and checked that the FSS
board works ok. But it still has the big oscillation. Osamu thinks it
is an electronics problem that can be fixed. But he's also checking and
tuning up the optical path to the reference cavity.
- Osamu and Rob found that the EPICS
sliders for the FSS common gain and fast gain do not work as they
should. They will enlist Ben to help find and fix the problem.
- We intend to adjust the PSL slow loop
temperature change in the EPICS state code.
Optical
sensing (Kawazoe, Sakata, Ward):
- Fumiko continues to work on
implementing an oplev servo filter based on what she found at the sites
(modified with FOTON to be more appropriate for our 5" optics).
- Shihori is documenting her
commissioning of the electro-optic shutters.
- Steve will attempt to adjust the
camera views so that the beam flags (in front of the 4 test masses) can
be seen.
Electronics
(B. Abbott, Heefner, Taylor, Mageswaran):
- Ben has been accumulating the
remaining hardware needed for length sensing for dual recycling,
including: two more double-demod RFPDs, another 33 MHz RFPD, a third
LSCPD interface board, a fourth whitening board, and a fourth
anti-aliasing board.
- Jay is working on mods to the LSC rack
drawings to get the wiring for these additional boards.
- Ben continues to work on the redesign
of the RFPD amplifier for fast RF and low power.
- The RFM network went down on Wednesday
at around 6am for unknown reasons. Rob spent much of the day trying to
get it back up (by rebooting the vme cpus) with no success. Jay
determined that the problem was that the c1epics linux cpu which
connects EPICS with the front-end servos was not performing its task.
He restarted the task and everything else could be brought up by the
end of the day. Thanks, Jay; this is going into the procedures manual!
- Ben will check that perennial problems
associated with rebooting (XYCOM boards not set right, EOS state not
right, polarities for mechanical shutter toggles set right) are now
being automatically done right.
- Steve has had no luck locating our
STACIS servo extender board, and TMC wants $1K for a new one. We'll see
if we can borrow one, and/or attempt to optimize the servo gains
without it.
- Steve located some old picomotor
controls which work with our picomotor-driven in-vacuum beam flags, and
he and Bob have run cables so that all beam flags can be controlled
from the control room. Ben modified a switch so that it worked with
this system.
- A controller for a uniblitz shutter
that was non-functional out of the box will be fixed by the
manufacturer at no charge.
- Bob ordered heliac cables and
connectors for the long fast RF runs, and they are on their way.
- EPICS code to shutter the PSL during
vacuum transitions will be implemented soon.
- We plan to do a careful search for 60
Hz pickup in our LSC crate, which is anomalously large.
- Mohana and Shihori continue to work on
setting alarm limits on all EPICS channels in the EPICS alarm handler.
Facility
(Vass) and South Annex Bake Ovens (Taylor):
- Bob plans to deliver 8 LIGO-I OSEMs to
Janeen (and spares for the 40m) by the middle of next week.
- Bob is finished plumbing up new
"clean" oven C, and is pumping on the RGA line.
- Bob has decommission "dirty" oven D
and surplused it. It is now removed from his lab.
- Bob is exploring building a new very
large bake oven for AdvLIGO.
Thermal Noise
Interferometer (Libbrecht)
No report.
LASTI (Ottoway)
LASTI Weekly (Allen, McInnes, Mason, Mittleman, Ottaway, Sarin,
Smith)
No report.
Data Analysis and
Computing (Lazzarini)
Simulation and Modeling (Bhawal)
Weekly
Physics Meeting
- Matt described details of his various work at MIT last week.
Virginio showed results from Seismic noise injection to SimLIGO. Biplab
talked about a solution by Virgo people for the problem of FFT way of
propagation for a focussed beam which violates Paraxial approximation.
A Week at
MIT (Matt)
- Worked with Rana, Peter and Nergis
on possible schemes for Advanced LIGO lock acquisition, improvements to
LIGO1 acquisition, LinLIGO noise modeling, and intensity stabilization
servo (ISS) design.
- Lock acquisition(LA) for AdLIGO may
take the form of a second laser injected along the path of the main
beam before the mode-cleaner. This laser would have a slightly
different wavelength (~900nm?) which would reduce the effectiveness of
the coatings, thereby making the IFO a low finesse system. The
low-finesse IFO would be locked, and then offsets applied to bring the
high-finesse IFO into resonance.
- We made a list of possible
improvements to the LIGO1 LA code, including frequency actuation,
non-resonant side-band sensing, improved power scaling, and a more
flexible interface. It seems, however, that as long as the
current system continues to work well this upgrade would not be an
effective use of resources, so this is on hold until a greater need
arises.
- LinLIGO is now able to produce a
full noise budget similar to the ones previously produced by Rana's
model. Several noise sources were added to achieve this goal:
seismic, thermal, frequency, intensity, oscillator phase, etc. I
will spend some time in the upcoming weeks tuning the interface and
adding featurs in preparation for my trip to LHO where I plan to gather
new data and produce a complete and up-to-date noise budget.
- For the Intensity Stabilization
Serve (ISS), I built a prototype analog amplifier which we used in
combination with Rana's modified current shunt. The prototype servo has
a bandwith of about 200kHz, 30 degrees of phase margin and factor of 2
gain margin. The gain at 10kHz is greater than 35dB, which is more than
sufficient to effectively remove intensity noise from the noise budget.
Seismic
Noise Injection (Biplab, Virginio)
- We injected accelerometer data from a locked stretch of S1 to
SimLIGO and slowly ramped up the noise level in simulation. We could
see that slower the speed of increase in the noise level, higher the
level of seismic noise that the interferometer can tolerate. In one
case we could go upto a factor of 7 higher than normal in this way and
SimLIGO still kept its lock.
FFT for a Focussed Beam (Biplab,
Hiro)
- A method is described in Virgo Physics book available in Virgo
webpage to tackle the problem of propagating too much focussed beam in
FFT when the beam violates the paraxial approximation. Both of us
independently tested it using Matlab. We still need to sort out a few
points especially about energy conservation. However, it seems it would
be a good solution to follow once we completely clear up our possible
misunderstandings.
Code
Development and Maintenance
e2e 2.0 release:
- (Hiro) When testing the release
candidate, a few glitches were found. One problem related to parsing
the setting string has been solved by modifying alfi. A new alfi has
been released already. The documentation of the new primitive FUNC_X
has been revised during this week, and a new revised version will be
included in the release.
- (Hiro) A long standing bug of macro
implementation - the path specification being not respected - has been
solved. This may not be in e2e 2.0 release, because some extensive
testing is needed.
- (Melody) FUNC_X: Biplab tested
FUNC_X using it in various cases. Fixed some problems found during
FUNC_X testing. Continuing with the technical documentation for FUNC_X.
Alfi
- (Bruce) Added Parameter Settings feature to assist the modeler
when settings contain semi-colons.
- (Melody) Looked at alfi code for a possible fix for one of the
problems found during FUNC_X testing.
LIGO Data Analysis System
Software Systems (Blackburn)
- The plans for upgrading the gmt_trigger database table need to be
settled prior to the next LDAS release obviously. This planning
requries inputs from LSC DASWG members. Because the meeting was
preempted by the APS talk reviews this week, we will now wait for
inputs durng at next week's DASWG meeting before settling the LDAS
release.
- The memory leaks associated with -dbquery, -dbntuples and
-dbqualityflag in the dataConditionAPI have been cleaned up. This still
leaves a large memory leak associated with the -dbspectrum option.
- Added a translate function to allow the dataCondition Library to
ingest ILWD data.
- Cleaned up the LDCG tool set in preparation for the next LDAS
release.
- Four seconds were shaved off of all URL retrievals within the
managerAPI. This had a significant impact on the rate at which DMT
triggers can be ingested into LDAS.
- The user command hypertext links for jobs under the LDAS logs now
includestart times.
- Carried out a major code review of TCL code for the manager,
generic, frame dataCondition and mpi APIs. Found nothing that needs
immediate attention, but several optiimizations are possible and will
be part of a future LDAS release.
- Continued to bring our new C++ programmer up to speed this week.
He is now fully qualified to review nightly build and unit test results
and to stow these builds and start/stop LDAS systems.
- Fixed metadata memory leak from dataRecv thread not waking up
leaving tid and object behind after job timed out by installing bgLoop
for waking up dataRecv threads. Fixed metadata to return exception if
job times out without getting data.
- Adjusted timing resource variable for the eventMonitorAPI,
lightWeightAPI, and metaDataAPI to allow better job control and fewer
failures.
- Added the sngl_inspiral database table changes to the LDAS-DEV
and LDAS-TEST systems and updated test scripts to reflect these changes.
- Installed DB2 8.1 (fixpak 5) on all tandem boxes except tandem2
and on the LDAS-DEV, LDAS-TEST and LDAS-CIT systems.
- Completed the system / integration level tests on the version of
LDAS built from CVS on Monday of this week.
- Configured the LDAS-TEST system to run a pre-release version of
LDAS 1.1.0.
- Drafted a "how-to" document for upgrading to IBM DB2 V8.1 for
LDAS.
Hardware Systems (Anderson)
Caltech
(Dan Kozak)
- Finally got Sun to send us all the T3 drives we needed for CIT.
- Got Sun to send 2 3510 drives for CIT.
- Set up L700 cleaning tapes at LHO as per the manual (we're
waiting to see if this technique works).
- Did Sun security patches for 6th floor desktops, ldas-sw,
ldas-dev/dataserver, ldas-test/dataserver-test.
- Upgraded all but one T3 at CIT to latest pSOS (1.18.03) and disk
firmware.
- Continued HPSS deletions.
(Stuart Anderson)
- Upgraded ldas-sw to the new version of /ldcg and related tools
being used for the next LDAS release (based on gcc-3.3.3).
- Upgraded security patches on 6th floor desktops.
- Remapped Condor cluster services for added security.
- Finished generating S1 L3 frames for the Stochastic group and
distributed them across the LDAS-CIT cluster.
MIT
(Keith Bayer)
- Built condor and have it running on cluster nodes.
- Cloning harddrives to replace hdd's in failed cluster nodes.
Livingston
(Igor Yakushin)
- Working out replication procedure in the new version of DB2.
Hanford
(Greg Mendell)
- RDS frames with channels requested for a study at LHO have been
generated successfully using LDAS and are located from fortress
under:
/samrds/postS3/temperatureRDS/L1/LHO/H-temperatureRDS_R_L1-764[4-6].
The data in these three directories spans the GPS time interval
[764447408, 764605824) and is in 16 second frame files, from
H-temperatureRDS_R_L1-764447408-16.gwf to
H-temperatureRDS_R_L1-764605808-16.gwf. The number of frame files =
9837. The size of each frame file ~ 3.2 MBs. The total size of data set
~ 31 GBs. There is one gap in the data (due to a time interval when the
framebuilder was down). The missing GPS time interval is
[764483136 764484160) = 1024 s gap. The above data has been permanently
archived onto tape and will remain visible from fortess indefinetly.
The channels in thse special RDS frames are:
H1:LSC-AS_Q 1
H1:LSC-POB_I 1
H1:LSC-POB_Q 1
H1:LSC-SPOB_MON 1
H1:ASC-WFS1_QP 1
H1:ASC-WFS1_QY 1
H1:LSC-POY_DC 1
H1:TCS-ITMX_LASER_ENABLE 1
H1:TCS-ITMX_AOM 1
H1:TCS-ITMX_AOM_SUPPLY_TEMP 1
H1:TCS-ITMX_LASER_MON 1
H1:TCS-ITMX_AOM_RETURN_TEMP 1
H1:TCS-ITMX_CENTRAL_MASK 1
H1:TCS-ITMX_AOM_MON 1
H1:TCS-ITMX_ANNULUS_MASK 1
H1:TCS-ITMY_LASER_ENABLE 1
H1:TCS-ITMY_LASER_MON 1
H1:TCS-ITMY_AOM 1
H1:TCS-ITMY_AOM_MON 1
H1:TCS-ITMY_CENTRAL_MASK 1
H1:TCS-ITMY_ANNULUS_MASK 1
H1:LSC-POYPD_IMon 1
H1:LSC-POYPD_QMon 1
(The 1's after each name is the downsample factor; 1 mean no
downsampling so all the channels will be at the same sample rate in the
reduced frames as in the raw frames.)
Data Analysis Activities
(Lazzarini)
Creightn:
- This week I helped Peter Shawhan prepare a report on our our
Exttrig burst code review, and checked the timing precision for all
pulsars in the known pulsar search (to be written up this afternoon).
Mendell:
- As last week, we continue to work on comparisons of our code with
the Hough code, and improve our estimated upper limits. We have a plan
for the code needed to run Monte Carlo simulations for the final
results, and hope to start writing that soon.
Shawhan:
- Drafted talk about inspiral results for the upcoming APS Meeting,
and presented it at the all-LSC telecon on Wednesday.
- Worked on reviewing pulsar S2 time-domain analysis, which is to
be presented at the APS Meeting.
- Gave feedback to Duncan about his GWDAW proceedings article draft.
Sylvestre:
- Worked on porting TFClusters and the burstdso to a stand-alone
application. In particular, worked on issues related to using the
datacondAPI in stand-alone mode.
- Worked on applications of my Coherent Power Filter algorithm to
the burst search. Got very encouraging results from the S2 playground
data, both from the detection of Sine Gaussian signals and the
rejection of noise, and from the localization of the source on the sky.
Weinstein:
- Working on Inspiral S2 Binary NS analysis review
- Working on documenting all the burst waveform catalogs
Yakushin:
- Generated and tested with waveburst the first set of LIGO-TAMA
high-frequency MDC frames.
- Generated but have not tested yet gaussian all sky waveforms on
the whole S2.
- Working on generating ZM and BH merger MDC frames.
Lazzarini:
- Edited and resubmitted the H1+H2 optimal signal estimation paper
to PRD Verified the S1 analysis results could be reproduced using the
new S2 pipeline in Matlab. This was requested by the stochastic results
review committee.
General Computing (Wallace)
MIT:
(Keith)
- Rebuild hacked windows box
- Reconfigured ldas E450 to mount GC executables
- Met with Tufts computer people for upcoming LSC conference
Livingston:
(Shannon)
- Current bandwidth usage can be seen at http://teche.ligo-la.caltech.edu/mrtg/LLO-Router/130.39.245.1_1.html
- Archived bandwidth usage can be seen at http://teche.ligo-la.caltech.edu/mrtg/archive/
under the dated folder for the week of interest.
- Spent a lot of the last week working with a RAID disk system
which the user home directories will once again be moved to. I
replaced all of the drives in it since we had two drive failures in it
and the drives were out of warranty. This also increased the
capacity to > 1 TB at RAID 5. I spent a good bit of time
setting it up and then used rsync to copy the home directories to
it. Due to the limitations of a UFS file system which is >
1TB, there is a 1 million file limit. We have > 1 million
files in the home directories so at 182 GB of files, Solaris reported
that the disk was full. df -h reported only 182 GB of 1.09 TB
used, but df -o i reported all of the inodes used. I then tried
to create a new file system with a greater inode density. Solaris
would not let me. After much work with format, newfs, and reading
on Sun's web site, I discovered the limitations on a 1 TB disk.
In addition to the UFS limits, a disk with >= 1TB does not use the
standard vtoc to format the disk. It uses an EFI format to create
the slices. Last night when I left I recreated the hardware RAID
with RAID 0+1 which should reduce the capacity of the RAID to ~800
GB. This should allow Solaris to work with the disk more easily
and also provide more redundancy in the RAID. Once again tonight
I will start rsyncing the files to the new disk. It should be
done by morning so that I can start migrating the user directories to
it.
- Tried last night to install another switch in the new
building. This is needed since we are using all of the ports in
the existing switch and we need more. Unfortunately the switch
would not even fit in the rack (the rack is half of the standard rack
depth) so I have ordered a switch from Dell that will fit.
- Renewed all of the Matlab license maintenance contracts.
- Started on a script to change the group ownership of everyone's
files so that once we change the staff gid I can then change the
files. This script needs to be a bit more intelligent than just
chown -R since some files may intentionally have a different group than
the owner and we should not change that.
Hanford:
(Christine)
- Network usage can be seen at http://www.ligo-wa.caltech.edu/~christin/mrtg/
198.129.208.1_198.129.78.122.html
- Spent Monday doing my duty at Jury selection. Thankfully, I
was not selected.
- Mike Pedraza provided me with a written report of his audit of
our PCs. There were some problems that Fred and I will have to
deal with, but most were in good shape. I will finish auditing
the rest of the laptops over the next week.
- During Mike's audit he found two PCs that have bad hard drives,
I've ordered replacements. Unrelated to the audit a user's
monitor went blank then smelled of melting plastic and would not turn
on again. I've ordered a replacement monitor.
- Followed up on an order that is over due. Ordered some
supplies as requested by the users. I'm also purchasing
Symantec's Ghost software to do disk images of the PCs and Zonealarm
for the travel laptops.
- Blocked an IP address at the firewall, spam e-mail was
originating from this ip address.
- I had to re-install Windows and some application software on a PC
that suddenly stopped booting. I'm still working on getting all
the software working again.
- I have two other computers that were found to have problems
during the audit and now require a complete rebuild. I'll be
working on those over the weekend.
- The new license server is ready for use, I'll be working with
Dave to get it connected to the CDS network.
- I've started changing the group id for user accounts that use
group 10. This has been quite a mess because the Solaris
Management software for managing user accounts has many bugs in it and
each time I change a user's group id it invalidates the user's password
as well.
CIT:
(Mike)
- Worked in Hanford part of the week; going through as many pc's as
possible patching up security holes, running windows/office critical
updates and fixing OS/software errors.
- This week I had a lot of catch up work on onsite user support,
that included fixing software, printing and networking issues.
- Have been going around making sure that our users have updated
their workstations with the latest critical updates. I also have been
stopping unnecessary services that hackers are well aware of.
- Submitted a report to Christine on the work I performed out in
Hanford.
(Bruce Sears)
-Ilog: (4.5
days)
- Added author and keyword threading feature.
- Added keyword edit feature and group controls.
- Designing and implementing new content interface.
- Writing filter to change stochastic group keywords.
(Lisa)
- Spent many hours reviewing spam for false positives and trying to
make the filters more effective. I'm very near the point of
having the adaptive filter running. I'm currently still feeding
in good e-mail (ham) to finish its training.
- Programmed 2 of the new AP-2000's to replace access points in
wilson house and the Synchrotron.
- Worked on a number of user problems including an nfs mount
permission issue and ssl setups.
- Submitted a proposal for a paper on postmaster mail filtering to
next year's LISA Conference.
- Mail Stats 4/15 - 4/21
- Messages Accepted: 17352
- Spam Rejected: 9289
- Viruses Rejected: 879
- False Positives: 45
- Total Mail Thru: 27520
(Veronica)
- LSC website: Most time was spent working on LSC-related projects.
Made and installed webpages for the review of LSC technical papers.
Access to papers currently under review is password-protected. The
reviewed papers will be published with open access. Updated the
navigational bar with new images. Working on the website for the
upcoming June meeting.
- LIGO website: Implementing changes related to the recent change
of LIGO PM. Usual upkeep.
- CaJAGWR website: updates to the website, usual amount of upkeep
and support. As the ITS cluster became available again after a security
incident, I was able to post the stream pointer and a file of the last
talk.
- Project Science: Support for the upcoming October workshop.
Started working on the workshop website.
(Larry)
- Resolved a couple of web and web-calendar issues. Also, setup a
new web calendar and removed a couple of outdated links.
- Assisted the DCC with a number of issues. Everything from moving
files to going over the changes needed in the s/w program that George
S. is still working on.
- Placed a number of orders for equipment, including a new printer
for the 6th floor. When it arrives we will do some shuffling of units.
- Worked on a number of PC fixes. Most needing s/w installs and
some upgrade work.
- Had a little fun working with Dennis on getting his analysis to
work on the SDRC pkg.. Now I need to work in getting the results to
display.
- Worked a number of webcam issues. The new zoom lens does work but
the graphics on the screen in the SCR are a little too small to be
totally clear. We will keep working on it.
- Reworking a couple of documents. One of them concerning the
security plan which is and will eat up some time.
- Setup a number of user accounts. We have a few SURF students and
visitors that are trying to get a few things started before they arrive.
- The electricians showed up for the computer room expansion. Spent
a number of hours going over the logistics with them. Presently, it
doesn't look like we will have to power-down any equipment, I hope it
stays that way.
- Spending time each day going over the e-mail filter system. Going
through the logs and updating rule sets is a daily task that appears
will have to continue for some time. On the positive side there
have been a decrease in the amount of spam getting through.
- Over the past week we have experienced intermittent network
problems. So, far most of the problems have been outside the CIT
borders with a few minor ones on the edge routers.
Advanced LIGO and
Supporting R&D (Shoemaker)
Seismic Isolation
From: Jay Heefner
<jay@ligo.caltech.edu>
- Modified and tested a voice coil actuator in an effort to meet
the new requirements. The modified version comes veyr close to meeting
the requirements, but further testing and measurements are needed for
freq<10Hz.
- Put together a block diagram of how we might use the ADE
capacitive position sensors. Once we agree on the block diagram, we
will send it to ADE for comments.
From: Larry Jones <ljones@ligo.caltech.edu>
Advanced LIGO Seismic
Structure
SEI Structure:
ASI is re-planning the project cost and schedule
with the HAM structure fabrication removed from the task. The BSC
configuration development is on plan.
LIGO has submitted comments to ASI on their process specifications for
fabrication and for precision packaging of the SEI structure and pods.
The Design Review meeting for the BSC structure is scheduled for May
18, 2004. Delivery at LASTI of the BSC prototype is expected to be in
November, 2004.
Actuators:
PSI has confirmed that they will be making the
actuator designs
self-protective from lateral shifts; that is, a shifted bobbin will
contact the inner core piece before it contacts the magnets on the
outside.
PSI will be using 6061-T6 for the bobbin material to minimize the
effects of reheat on yield strength.
PSI is scheduled to deliver interface drawings for the actuators by
April 29.
Position Sensors:
Feedthroughs were ordered from Insulator Seal. Jay
has diagrammed the
sensor/module setup for a chamber and has had a productive discussion
with the vendor, ADE.
Seismometers:
Nothing new.
Galling/Dusting Test:
Nothing new.
Suspension
From: ctorrie <ctorrie@ligo.caltech.edu>
- Design meeting:
http://www.ligo.caltech.edu/~ctorrie/SUS_MEETING/SUS_MEETING.html
- CPtype Quad: The design of the Test Mass, Penultimate Mass,
Reaction mass and Penultimate reaction mass is on going. A document
outlining the requirements is available in draft from at the above
link, LIGO - T040013-04. Assemblies have been created for each
with required configurations this implies that we have 6 assemblies.
several aspects have to be finalised. It is hoped to have these
completed by the end of April.
- Single and Double Pendulum: A test on a 4 x4 array eddy current
damper has been set up on a 40 kg mass by Janeen and I. the next step
is to take the transfer function or response. The parts for the
double pendulum are ready and will be built as part of a visit by
Russell Jones in May.
- Visits:
Russell Jones May 10th to may 19th 2004
LOCATION: Caltech
Mike Perreur-Lloyd June 1st to August
1st 2004 LOCATION: Caltech
Calum Torrie August 2004
LOCATION: Glasgow
From: Janeen Romie
<romie_j@ligo.caltech.edu>
AdLIGO Suspensions
Quad FEA
Still working with Dennis and Calum on Quad/SEI fea. We completed
the heavy mass/high first mode model to remove enough mass to meet the
mass budget (with contingency) Dennis had provided. Modal analysis was
performed in Ansys and Algor to prove that the first mode is still 150
Hz. I made an IDEAS universal file in Algor and gave it to Dennis to
integrate into his coupled dynamics model.
MC to LASTI in June
Coordinating with many key folks on preparing for the mode cleaner
triple suspension to go to LASTI in June.
Hybrid Osems
Corona Magnetics quoted for the magnet coil winding job. They can
accomplish the coil winding on a limited number of coils (the ones we
need for the MC controls prototype for the LASTI installation in June)
in a week, if we pay an expediting fee. I'm working with another vendor
in Rosemead and hope to have a second quote by the end of this week.
Suspension Gazebo
Minitec has shipped the kit for the suspension gazebo. It is 11
feet high but can be re-configured to about 8 feet high. It is very
modular so it has a number of uses, along with the primary use of
mounting the quad prototype.
Suspensions Controls Prototype Testing Plan
I've incorporate all changes but I am still waiting for
clarification on a few issues from Mark Barton and Caroline Cantley. I
reminded them on Tuesday.
Primavera
I've completed assigning Primavera task numbers to the Quad task
list such that Primavera updates and task scheduling/priorities may be
done more easily. Calum has input them in the Excel version of the quad
task list. I've scheduled a meeting with the Primavera reporting
personnel for Friday at 8am to make the appropriate (% completes)
updates.
Catcher Development
In preparation for the four experiments to support quad catcher
development, I'm redesigning a number of parts in Solidworks and will
bring the prints to the machine shops this week. Calum, Helena and I
also had a meeting with Jean-Marie Machowski this afternoon to discuss
the covers for the optics. The meeting was very enlightening and
provided us with a number of things to think about.
Input Optics
Progress Report for the Advanced LIGO Input Optics (Period:
February 15 – April 1, 2004)
1. UF High Power Laser Facility at the LIGO Livingston Observatory
Cognizant Scientists: Rupal Amin and Ken Franzen
Progress at the HPLF has been in the areas of safety and equipment
acquisition. Since the primary laser and Advanced LIGO EOM
prototypes have not yet arrived, no tests or experiments have been
conducted.
In our last update, the HPLF had completed and obtained approval for
its laser safety plan and was in conformance with LIGO laser safety
protocols. Although these protocols were adequate, a revised site
stipulation regarding laser emergency shutdown procedures has been put
in place. HPLF compliance procedures involve procedures for
shutting down HPLF’s lasers during an improper lab incursion.
Safety hardware and software have been procured for this purpose and
await installation approval. Additionally, the HPLF lab has
satisfied local fire codes, effective at the beginning of March.
Smoke detectors and optically compliant, halon based extinguishers have
been installed.
The HPLF has also acquired laser beam diagnostic components
specifically for the high power laser system. These units are a
BeamScanÒ from Photon Inc. used for beam tomography and a cavity
spacer to be used in precision wavefront measurements. Both
devices were made available by the California Institute of
Technology. Photon Inc. has informed the HPLF group that we
should expect a BeamScanÒ to be shipped on the 23rd of
April. This will coincide with the delivery of the HPLF 100 W
laser.
The HPLF eagerly awaits its new 100 W fiber laser from IPG Photonics
Corp. In an e-mail dated 31 March 2004, IPG set a shipping date
between April 19 and April 23. After it is unpacked and initially
activated by their engineer, the HPLF will have 30 days to verify the
performance of the laser and return it if not satisfactory. A two
year limited warrantee ensues for hardware and components that are not
expected to fail.
In upcoming months, the lab plans to begin endurance testing the AdL
electro-optic modulator under 100 W (single pass) and 200 W (double
pass) conditions. This experiment will also be followed by a
series of RF sideband stability measurements while the EOM sustains 100
W radiation levels. Further experiments are pending on initial
results acquired from these first two basic tests.
2. Mode Cleaner Thermal Modeling
Cognizant Scientist: Ken Franzen
We have been testing the Melody AdLIGO mode cleaner model, written by
Ray Beausoleil with input from Amber Lynn Bullington Stanford
University. The Melody code aims at providing detailed steady state
numerical models of interferometers taking thermal distortions into
account at high input beam powers. The physical phenomena included in
the present version of Melody includes aperture diffraction,
mirror-field curvature mismatch, thermal lensing in substrate and
coatings, thermo-elastic surface deformation, and the elasto-optical
effect.
The AdLIGO mode cleaner model is still not complete since mirror-field
curvature mismatch and astigmatism are not yet included for the curved
mirror. However, the contribution from these effects have been
estimated as small. Preliminary results from the present model indicate
that the thermal distortions of the input beam leaving the mode cleaner
are insignificant, i.e. much less than 1 % contamination of the carrier
and sideband output beam by higher order spatial modes. Work is in
progress in order to complete the model and verify these preliminary
results.
3. Laser Adaptive Optics for Advanced LIGO Mode-Matching
Cognizant Scientists: Malik Rakhmanov, Liang Zhang, and Joe Gleason
Theoretical modeling for thermal lensing has been implemented over the
past month. The model assumes that a 514 nm argon laser is used
as a heating (or writing) beam to generate the desired thermal lensing
effect on OG515 Schott glass. A Nd:YAG laser is used as reading
beam to evaluate the thermal lensing. The model uses a calculated
or numerically derived temperature distribution created by the writing
beam to aberrate the reading beam. Modal structure is determined
by computing Gaussian mode overlap integrals. The argon and Nd:YAG beam
power and mode parameters can be adjusted to determine the optimal
configuration. The theoretical results confirm a variable thermal lens
can be generated using different power of heating beam.
Fig.1 shows the temperature profile on the front surface of OG515 when
the power of heating beam is 4W and beam radius is 8mm. The
thermal gradient varies the optical path length (OPL) through the
temperature-dependent refractive index and thermal expansion. The
OPL change results in a thermal lens through coupling to the
temperature dependence of the refractive index. Fig.2 compares
the predicted to the experimentally measured dynamic focal lengths. The
theoretical results are in good agreement with measurement results in
focal length of thermal lens, with the focal length decreasing from
approximately ¥ to 5 m with increasing heating beam power of.
Fig.3 shows the power in TEM00 mode of reading beam through the thermal
lens is strongly dependent on the ratio of the size of heating beam to
the size of reading beam. Larger writing beams are better, not
surprising since the reading beam will become more aberrated as it
samples non-spherical optical path deformations. Fig.4 plots the TEM00
mode in the new basis (after focusing) assuming a perfect TEM00 input
mode and indicates the thermal lens doesn’t introduce large-amplitude
higher modes for an optimal choice of reading to writing beam
ratios.
We are now investigating the effects of heating from absorption by high
power reading beam (the 125W Advanced LIGO laser).
[Figures did not come through. If interested contact
David Shoemaker or Dave Reitze (reitze@phys.ufl.edu) -pel]
4. High Power Electro-optic modulator development
Cognizant Scientists: Wan Wu, Guido Mueller
Electronics: For our home-made modulator, a commercial hybrid
temperature controller HTC-3000 is currently used instead of the PID
controller (see DCC#: LIGO-E030494-00-D) designed by Mike Marquez. The
setting point resistor is adjusted to let the temperature controller
work properly. A box with ribbon cable connector on is built to
hold the controller and the cable with the AMP CPC connector is built
to connect the EOM to the power supply and the temperature
controller. Testing of this unit is continuing.
New Focus RTA-based modulator: We have received our custom RTA-based
New Focus modulator. Looks like a standard New Focus EOM with a 4
mm aperture! The modulation frequency was specified at 20 MHz for
this go around. Higher frequencies should be no problem.
5. IO Mechanical Design
Cognizant Engineer: Luke Williams
Progress has been made in several areas. First, the March LSC was
attended, including talks by the systems and suspension groups that
affected the layout. Second, the layout was updated with the new
1.950m circular HAM tables. Third, it was determined that the
osems on the MC suspensions will not interfere with the laser.
Fourth, mounts and stands were designed for the Faraday Isolator.
The layout was updated to include this change as well. Figure 5
below shows the new layout of HAM1. Figure 2 shows a 3D model of
the FI. A variation of this will be retro-fitted into the H1
interferometer in June.
[Figures did not come through. If interested
contact David Shoemaker or Dave Reitze (reitze@phys.ufl.edu) -pel]
Core Optics
From: Helena Armandula
<ahelena@ligo.caltech.edu>
Summary of the teleconference that took place on Wed., 21st, 2004
The teleconference took place during J-M. Mackowski's visit to Caltech.
Ask Helena for associated image files.
Attendants: Sheila Rowan, Gregg Harry, Roger Route, Norna Robertson,
Jean-Marie Mackowski, Bill Kells, Gari Billingsley, Riccardo DeSalvo,
Helena Armandula
On the issue
of adhesion of coating to sapphire, Jean-Marie mentioned once
again that, cleaning sapphire before coating, is very difficult.
He examined the two sapphire substrates we sent for coating, one
superpolished, the other commercially polished. Enclosed are
pictures of features observed on the superpolished substrate. The marks
could be seen faintly with an intensity lamp and looking at an angle.
Pictures taken under a microscope at 5x. Where the marks are seen, the
coating did not stick. These features were not observed on the
commercially polished substrate. See pictures attached.
NOTE: Bill
Kells made the observation that the features seen on these pictures are
very similar to the ones seen on the pictures he took of the Hanford
interferometer (fused silica) optics under lock. At the time, we
thought that the "smears" were cleaning marks, now????
He also measured the surface roughness on both substrates. There was
not too much difference between the substrates, however, peak to valley
differences were more pronounced on the commercial parts. See the
attached graphs.
About film
structure, effects of crystal orientation. He was not very
concerned with the materials we are testing since they are amorphous.
Coating
absorption - The only limitation is the sensitivity of the
measuring system with a limit of 0.4ppm for sapphire compared to the
limit of 20 ppb for
fused silica.
Coating
progress up-date -Jean-Marie will be shipping the coated
sapphire to Peter Sneddon on April 26th. The coating is the same doped
tantala that showed lower mechanical losses in fused silica substrates.
On future work
LMA developed a sort of traveler to track the substrate information.
See the model attached.
Mirror cover
design - With Janeen and Calum we discussed a cover to protect
the mirrors during handling and assembly steps.
Jean-Marie provided us with the sketches of a stainless steel shipping
container. He tested parts stored in the metal containers through the
years and did not see any coating changes. Also, discussed was
the mirror handler that he uses. It does not use vacuum on the coated
side on the substrate like the ERGO arm. Vacuum can be a source of
contamination if up-most care is not taken.
For coating
purposes he favors fused silica over sapphire. Chances of coatings
failing on sapphire are greater. Cleaning is problematic. Unlike
sapphire, for our application (many thick layers), fused silica is a
very well known material.
Ed Jasnow joined us for lunch, the contract has FINALLY been signed!!!!
[No graphics provided -pel]
For additional information about this report, contact lindquist_p@ligo.caltech.edu