The LIGO Executive Committee meeting for February 21, 2005
is cancelled because of the Holiday.
No report.
LIGO Laboratory
Administration (Lindquist)
STATUS OF LSC MOUs (Petrac)
LSC MOUs and Research Plans and Progress Reports
For a web page summary showing the status of LSC MOUs and associated
Attachment updates through August 15th and Progress Reports through February
12th see:
http://www.ligo.caltech.edu/~irena/Revstatus/Reviewstat.doc
Non-LSC MOUs
SITE TELECONFERENCE
(Lindquist)
A site teleconference was held on Thursday, February 17, 2005.
The following items were among those discussed:
·
Assigned Action Items: The action to establish a
PMA account to be used for Web Site reservations for the LSC Meeting has been
accomplished. There seem to be learning curve issues related to getting
the site up for people to begin registering for the March LSC meeting.
The current estimate is tomorrow (Friday, February 18, 2005). E. Jasnow
will monitor the situation with Livingston and with the Webmeister here at
Caltech.
·
Conference Calling: Didn't work this week.
The numbers had expired.
·
P-Card Training: P-card training for
Livingston personnel is now scheduled for March 9th.
·
Livingston Electrical Maintenance Contract:
M. Zucker has read the draft RFQ and will return a couple of minor edits.
·
Replacement of Air Conditioning at Caltech:
Musical offices is in progress in Bridge at Caltech because of construction
(replacement of the air conditioning system) and hazardous material remediation
activities. Everyone is asked to be patient if communications are
occasionally disrupted. The SCR will be used again next week for the site
teleconference instead of the ECR.
·
Personnel Issues: There was an editorial
in the New York Times. Apparently there has been a massive amount of
pressure applied to the State Department from the scientific community to speed
up the processing of VISAs. New rules will make clearances valid for four
years for students and for two years for working scientists. E. Jasnow
accepted an action (#130) to check with the International Scholars Office at
Caltech to ascertain how this may affect students and scientists who are
already here.
·
The list of assigned actions updated through February
17, 2005 will be found Here.
PROPERTY MANAGEMENT
(Chargois)
>Ed Chargois <chargois_e@ligo.caltech.edu>
DOCUMENT CONTROL CENTER
(Turner, Mak)
>Linda Turner - turner@ligo.caltech.edu>
>Cleveland Mak <mak_c@ligo.caltech.edu>
|
WE 2/17/2005 |
In |
Out |
Packages |
22 |
4 |
|
Faxes |
54 |
19 |
COST SCHEDULE CONTROL
SYSTEMS (Cunningham, Brambila, Kaufman, Salone)
>Esther Cunningham <esther@ligo.caltech.edu>
>"Brambila,
Ruth" <Ruth.Brambila@caltech.edu>
>Gina Salone <gsalone@ligo.caltech.edu>
>Florence Kaufman <fkaufman>
SUBCONTRACTS MANAGEMENT (Petrac, Jasnow)
>Irena@ligo.caltech.edu
(Irena Petrac)
>Ed Jasnow <jasnow@ligo.caltech.edu>
SUPPORT (Baldon,
Lloyd)
>Irene Baldon
>Dorothy Lloyd
PROPOSALS and REPORTS
(Lindquist)
Nothing to report.
DCC Steering Committee (Lindquist)
The DCC Steering Committee met February 16, 2005. Discussion
continued on the requirements matrix currently under development. The
next meeting of the DCC steering committee is scheduled for Tuesday, February
22, 2005. The location has been moved to the SCR while installation of
the new air conditioning is in progress.
CHANGE CONTROL/CONTINGENCY MANAGEMENT
(Lindquist)
>Cindy Akutagawa <cindy@ligo.caltech.edu>
Quality/Safety
(Tyler)
>From: Bill Tyler <tyler@ligo.caltech.edu>
No report.
Summary of Commissioning Activities at LIGO
Hanford Observatory (L. Matone)
This was a difficult week for H1, both in robustness and sensitivity. For the
past couple of days, locking has been difficult -- investigations are in
progress.
4km IFO
2km IFO
DAQ
LHO Outreach
L1 Commissioning (Valera Frolov)
Interferometer stability improved significantly after
additional sources of optical backscattering were identified and eliminated.
The largest offender was the beam clipping on the optics on the X-arm transmitted
light optical bench. During the last three days we had several long lock
stretches with one lock lasting thirteen hours. The inspiral range during the
long locks was around 6.5 Mpc and peak-to-peak variations of several percent on
an hour time scale. The best inspiral range is now
close to 7 Mpc.
The summary of commissioning activities this week:
·
mystery noise that appeared in the AS PD dark noise was
removed by adding ferrite chokes on the cable going to the AS_I servo/test input.
The dark noise was further improved by attenuating the RF drive of the AS_I
servo.
·
dtt code was updated to allow fast DAQ data to be
viewed in the control room. The up to date versions of SUN C and C++ compiler,
and ROOT were installed on CDS machines.
·
WFS servos were retuned for more robust performance.
·
the UGF of the tidal was extended to 0.1Hz to suppress
the HEPI gain peaking.
·
grounding of the electronics racks in the corner
station was reworked. Now all the
racks are attached to a big lead by a short wire instead of being
daisy-chained.
·
X end station seismic noise at 11Hz was identified to
come from VEA HVAC air fans. The noise from 11Hz duct resonance was removed by changing
the fan pitch.
·
frequency noise contribution to the ifo output was
re-measured. It was found that the ifo noise improves with more light on the
reflected port PD, but we are currently limited by saturations from the signal
in the orthogonal phase.
·
accelerometers and magnetometer were re-connected. The
1 Hz sideband structure on 60Hz line from the end station heater still shows up
on the end station magnetometers.
·
interferometer DC calibration was re-done and new LSC
model was produced. The transfer functions of the anti-imaging boards at the
end station were re-measured.
·
interferometer contrast defect was re-measured. The
result is 10 times larger than was obtained in the last measurement a year ago. Another independent measurement of the
carrier to the sideband ratio gave a factor of 5 discrepancy with the old
contrast defect number.
Education and Outreach (Thacker)
Sent out email LEPAC invitations for May meeting.
Prepared for two outreach visits 2/18:
Attended LA GEAR UP Teacher Professional Development RFP
review on 2/14
Safety and Security (MZ for Riesen)
Rich is at Rockwell in Cincinnati for an LSO training course
this week.
Tom reports no safety issues worth noting, but does not
enjoy carrying the cell phone.
Site Administration (B. Wooley)
·
Preparation for the March LSC Meeting in full swing.
·
Attended Dreamweaver training to support LLO web
re-work.
L1 and AdL Mechanical Engineering (Spjeld)
AdL Quad SUS
Installation Fixtures
AdL SEI Engineering Effort
LLO Engineering
HEPI Valve Calibration
Upcoming Tasks
LLO General Computing and LIGO CyberSecurity (Roddy)
·
The new router locked up a couple days ago. Tom
had to power cycle and reboot it. There was no indication of the reason
for the lockup in logs, etc. Might be nice to have a device to power
cycle the router remotely. Looking into this...
·
Still working with LSU on the bandwidth
bottleneck. It is somewhat of a mystery. We have eliminated our
bottleneck, now it is a matter of finding out where the remaining bottlenecks
are. My suspicions differ with LSU's. It is not looking hopeful for
S4 data transfers.
·
fixed (I think) a VPN issue with our firewall. I
still need to confirm that there are no other issues, but I believe that I
found the bug.
·
Still working on putting together a new web server.
·
Working with the local Sun rep on covering our Suns
whose warranties have expired.
·
Trying to track down a server that the shipping company
lost. Dell will replace it if the server cannot be found. However,
I am still behind since I have been delayed at least 3 weeks on receiving the
server.
·
putting together an order for apple. Two laptops
and possibly a couple other machines.
·
working on some documentation and scheduling for
security items as a result of the LHO meeting.
CDS Software Support (Khan)
·
Trying to bring the weather station data online. We
have had no success, as we found out that there may be a problem with the cable
runs between the EPICS controller and the outside weather station controller.
·
Preparing for S4 the run, including, the RoboScimon and
the DMT channel configurations.
·
Writing a Linux device driver for a portable data
logging system that may reduce the number of cables in the EPICS DAQ system.
High Power Laser Facility, Optics Modeling and L1
Commissioning (Franzen)
·
Finally received an update from IPG Photonics regarding
the the status and repair of the broken 100 W laser. Unfortunately nothing but really
bad news. The IPG engineers found that the fiber blocks and other components
within the laser have burned. Furthermore, due to the extent of the damage they
claim that it is difficult to determine the exact cause for the failure. The
expected repair time is as long as 4-6 weeks, which they will expedite as much
as possible.
·
David Reitze asked me to use the latest AdvLIGO mode
cleaner Melody model to simulate the present LIGO-I mode cleaner at 0-30 W
input power. The reason for this
exercise is to check that the reflected beam profile is consistent with the
real data and also to predict how it would appear after an upgrade to 30 W
input power after S5. My results so far can be inspected at http://www.ligo-la.caltech.edu/~franzen/melody/LIGO-I_MC.html
· I used a microscope in order to study the coatings of the RTP crystals which was irradiated by a >85 W, <0.7 mm diameter beam for three weeks. After careful study I claim that no damage is detectable using this somewhat crude method.
LDAS/Condor Sysadmin and Burst Analysis (Yakushin)
·
On Friday night tape robot got stuck while I was
attending burst f2f meeting at CIT. I called the control room to ask Tom to
power cycle the robot. Unfortunately, we misunderstood each other and a wrong
button was pressed which resulted in power interruption in the LDAS room.
After the power was restored, the system came up OK except that /samrds and /samraw
were not mounted on gateway which was noticed and fixed on Monday. To prevent
such cases of miscommunication in the future I suggest to have a cordless
headset phone in the LDAS room so that it is easy to direct somebody remotely
if I am not on site and something urgently needs to be done. Currently there is
no phone in LDAS room at all.
·
During recent days tape robot misbehaved several times:
it failed to initialized correctly on reboot, a tape got stuck in the hand,
etc. It turned out that the robot's hand is worn out and had to be replaced. After it was done the robot seems to be
working OK. I am importing more tapes now in preparation for S4.
·
The file system was reconfigured: /samraw, /samrds,
/cluster were merged into /archive (Dan).
·
For more convenient access to the archived data in the
control room, ldas:/archive is NFS mounted on CDS machines river and london
(there was a complaint that it is not that easy to access archived data in the control
room). The long term solution for this problem would be to QFS mount /archive
on some CDS machine, however, it cannot be implemented before S4.
·
3 disks failed in different T3s during this week.
·
Debugging and testing waveburst online scripts.
·
Generated several types of MDC frames for the whole S3
but since it was suggested at the burst f2f meeting that we might not have to
do a complete burst analysis of S3, this activity is at the moment suspended until
the final decision is made about S3 analysis.
·
Attended burst f2f meeting at CIT.
see
also the CDS weekly meeting minutes in the commissioning archives:
no
report
Jay Heefner reporting
no
report
PeterKing
The transfer function of the NPRO power actuator was
measured down to
Bill
Kells
I've
been working with the COC people to plot
Lee
Cardenas, Liyuan Zhang
OTF
Lab. (W. Bridge) shut down due to the HVAC refurbishment
& asbestos abatement
OTF Lab at Lauritsen ROOM 38
Cavity #3 no change
The contamination test for (6) new disks of VAC SEAL Epoxy samples is in
progress. Cavity is locked and we are taking measurements for absorption and
ring down for contamination loss every day.
Cavity #2 in progress
mode matching and optical set up is in progress New 51cm long contamination
cavity is being disassembled, changing new mirrors and parts to be cleaned and
baked. We need some more optics
(1/4waveplate, polarizer cube etc..) the alignment of the optics for the new
414 npro is underway.
·
This week we had a setback at the bond-noise
experiment. Two of the RTV springs in our seismic stack ruptured, and we had to
remove the plate, clean up the pieces, and install new springs. Many thanks to
Steve Vass for donating extra springs! IFO commissioning:
o
Rob and Rana tweaked up the filters for the LSC servos.
They opened up the BW of all 3 loops (PRC, MICH, & SRC), bringing the UGFs
to ~100-150 Hz. The changes seem to speed up the DRMI locking a lot, and seem
to help it hold better against the arm resonances. Rana also added violin mode
filters on the ETMY controller.
o
Rob and Rana's new auto-alignment script works pretty
well. However, in their tests, they moved the BS, which messed up the Y arm
completely. Osamu has put the BS P&Y back where it was, and he and Steve
have completely realigned the entire interferometer, including all suspended
optics, exit beam lines, oplevs, photodiodes.
o
Osamu tweaked the LSC demod phases to optimize the
signals. However...
o
The MC length drift produces a phase shift on the
transmitted RF sidebands; this wreaks havoc on all the LSC signals if the demod
phases are kept fixed. The solution is to monitor the MC length (or
equivalently, the RF frequency which is resonant in the MC) and change the RF
frequency in response.
o
Osamu has set up a simple monitor, which dithers the
MC_ERR signal at 30 kHz and then demods the demodulated MCR RFPD. He reports
daily changes of 10 Hz out of 33 MHz (corresponding to ~4 microns in MC
length); over months, the drift can be as large as 500 Hz or 200 microns!
o
He then feeds back to the RF signal generator. This
works well, except that we need to simultaneously change the 33 MHz, 133, 166,
and 199. The phase-locked signal generators can't respond to the feedback
signal. We need to replace these additional signal generators with RF circuits
that generate phase- and frequency-locked signals at 4x, 5x, and 6x. Osamu and
Jay are working on the design of such circuits.
o
If we can servo the RF frequency to keep the
transmitted sidebands on resonance, will the IFO servo demod phases stay
stable? To determine this, Osamu measured the relationship between the
demodulation phase delay on the MICH servo and the mismatch between the MC
length and RF modulation frequency. He varied the RF modulation frequency from
its perfectly resonant value by 1 Hz, 3Hz, 10Hz, ... 10kHz. His result agrees
very well with the expectation assuming a simple MC cavity pole. From this, he
accurately measure the MC finesse to be 970 (design is 1200).
o
Osamu found two problems with the optical spectrum
analyzer at the SP: the driver was broken and the wrong cable was used. He
swapped in the driver for the OSA at the MCT beam line, and replaced the cable.
The broken driver will be shipped back to Coherent for repair.
o
Osamu found that the electro optic shutter (EOS) at the
SP port varies in transmittance, and he suspects a thermal effect (crystal is
heating up?). He plans to disable the EOS and replace it with a manual HWP/PBS
(in addition to the mechanical shutter).
o
Virginio continues to optimize the performance of the
MC2 optical lever, reducing the couplings between PIT, YAW and POS, in order to
improve the diagonalization of the MC2 coil output matrix.
·
IFO modeling and DC detection development:
o
Ben has started testing the thermal handling
capabilities of the new in-vac DC photodiode for our homodyne experiment. It
has been heated inside a vacuum with 100mW for the past 24 hours, with a
temperature increase of only around 4 Kelvin. He will continue the experiment
for a few days until temperatures become stable.
o
Mike Smith made a revised layout of the output optics
chamber to revise the steering mirrors and beam splitter for the output mode
matching telescope, the output mode cleaner, and the in-vacuum DC photo
detector.
o
Rob continues to use Finesse to search for more robust
CARM and DARM signals for lock acquisition. Previously, we used XARM and YARM
to acquire lock, then switched to CARM and DARM smoothly. But with dual
recycling, the POX and POY signals are almost degenerate, and the CARM and DARM
signals are very narrow and almost useless for lock acquisition.
o
Monica continues to develop her e2e 40m code. She is
systematically measuring TFs and error signal sweeps from all degrees of
freedom to all sensors.
·
PSL:
o
Ben and Rich will tune up the MINCO temperature to get
rid of the large oscillation in the PSL reference cavity temperature. We are
seeing the effect of this variation in the RF phase of the MC transmitted
light.
·
Electronics and computing:
o
Ben has implemented all the new Rev.B coil driver
functionality: changed all of the auxiliary databases; reworked an EPICS
screens to employ the new coil offsets for all the core optics, and made the
cables to connect the new 4116 cross connects to their modules when they are
put in place. The revB coil drivers for ETMX and ETMY are in place and working.
He will put in the ITMX and ITMY coil drivers in the next few days, and then
the BS, PRM and SRM ones when they come in from the shop. We need to scrounge
around for the required 4116s and re-arrange the crates to find room for them.
o
Rolf has completed the ASC code for the 40m, and Jay is
~90% done with testing it. Should be able to install next week.
o
Still no solution to the problem of glitches from the
ISC110b ADC's reading out the suspension OSEMs. Jay and Ben are looking for
similar glitches in the ICS110b's reading out the IO and PEM data. Rolf has a
potential solution that was implemented in HEPI, but it probably would be a big
effort to get it going at the 40m; so it's on the back burner.
o
Rana changed the fonts used in the MEDM screens. You
can now read the numbers clearly! And the snapshots are easier to read, too.
o
We await some of Alex Ivanov's time to set up a new Linux
disk server, network firewall, and fremebuilder. We hope that when S4
starts, he will become available.
·
Lab Infrastructure:
o
Virginio and Steve have written a first draft
documenting the measurements, tuning up and resultant performance of the STACIS
system.
o
Dan and Monica continue to survey all of our in-air
optical beam lines, to document the as-built system and update the
comprehensive optical layout AutoCad drawing maintained by Mike Smith.
o
Electricians are installing a new circuit and many new
wall plugs in the 40m-control room. There is a circuit dedicated to our key
control computers, which will also have a UPS backup system.
·
Bake oven Lab:
o
Bob is setting up for bake jobs for Dennis Coyne and
for Janeen.
o
Bob continues to work with Calum, taking blade spring
data.
This week we had a setback at the bond-noise experiment. Two
of the RTV springs in our seismic stack ruptured, and we had to remove the
plate, clean up the pieces, and install new springs. Many thanks to Steve Vass
for donating extra springs! The stack is now restored and back in operation.
Also, Akira has put together a frame and pulley system with
counterweights for hoisting the glass bell jar in that experiment.
Jay continues to configure our new PC with Fedora 3 for epics control. Installation of Linux on that machine did not proceed smoothly at first, apparently due to a faulty CD-ROM drive. Jay replaced the drive and was able to install the operating system.
No report.
Mark Barton described his work on mechanical simulation for the Advanced LIGO that he started. Sany Yoshida and Dominic Dubois of Southern Louisianna University presented their work on simulation of the Input optics.
(Hiro) Various code modifications and runs have been done and will be done for the thermal effect study and the quantification of the effect of the mirror surface phase map. Physics results will be summarized next week.
(Biplab) Using SimLIGO and a set-up for output optics that reduces the beam width to ~1 mm radius, studied how the motion of mirrors could induce the beam shift at a photodetector or a phasecamera. The estimate is : the beam could shift by about 3% of its width at the detector.
Related to this study: The large beamshifts (of the order of the beam width) observed in fitting data of phase camera images taken under same thermal states seem to be originating from correlation between beam offsets and order 1 modal components, which creates degeneracy in fitted parameters.
(Mark Barton) The e2e simulation of the AdvLIGO triple pendulum that I reported last week was quite slow to run, so I spent some time hacking at the Mathematica to improve it. The issue was that there was a high-frequency eigenmode of each blade-tip that required a very fine time-step to resolve. (This was after previously eliminating five other even higher frequency eigenmodes for each blade.) To fix this requires that the blade tip be eliminated from the model as a mass, but simply setting its mass to zero doesn't work because the eigenfrequency goes to infinity rather than disappearing. The coordinates of the blade-wire junction have to be considered for the purposes of analysing how the blade and wire behave as ideal elastic elements in series but must be suppressed from the normal mode analysis. This required some structural changes and new features in the modeling toolkit. It all seems to be working OK, and so a new v1.6 toolkit, a new "xtralite" triple model and an updated manual T020205-01 will be released in the next day or so.
(Monica) New e2e simulations and comparison between e2e and Twiddle results: up to now the Differential Arm mode signals at 166 MHz and 33 MHz, the CARM signal at 33 Mhz match very well. Other signals at different frequencies will be compared soon. In the meanwhile, as crosscheck, I will try to simulate those outputs also with Finesse and with my analytical calculations.
(Hiro) Mark Barton started to build mechanical part of adv.LIGO simulation. He uses State Space code in e2e. The matrix is large, 45x45,
and it runs pretty slow. Optimization of RungeKutta code is being attempted.
A new release, together with an updated manual, is scheduled soon. (The date got delayed because unexpected bugs surfaced.)
(Bruce) - Completing Alfi documentation update.
(Melody) Performing regression testing using the new JGo library.
Chatterji:
Dupuis:
I spent some time installing LAL/LALApps and various applications I use (like Supermongo:) on my new Apple laptop. Then I checked some recent changes that Curt Cutler has made to LALBarycenter by comparing it to TEMPO. By calculating the Einstein delay at the site as opposed to the center of the Earth, the agreement between the two codes has improved by 1-2 microsecs (~rejean/tempo_test). I began preparing to write a methods paper for the pulsar search.
Mandic:
Mendell:
The first version of the StackSlide binary search code (e.g., which will be used to search for GWs from Sco-X1, other LMXBs, and other neutron stars in binary systems) has been checked into LALapps by Virginia Re. Virginia is a postdoc visiting LHO from Birmingham. She returns to the UK on Feb 20. The code currently works for certain test cases. Virginia will be working on adding more routines to handle Monte Carlo software injections to map out the parameter space metric, so that the code can perform a real search in the near future. Both she and I will be adding code in the next year to also StackSlide the F-statistic as part of a hierarchical search for continuous gravitational waves from isolated neutron stars and as well as those in binary systems.
Shawhan:
Weinstein
Yakushin:
LDAS
This week was focused on getting out a new release of LDAS for the S4 Science Run. This was needed to resolve a bug in the createRDS pipeline command discovered in the E12 Engineering Run. All system tests of the 1.5.0 release have passed.
A prerelease of the 1.5.0 release for the S4 run was installed at LHO on Monday to allow Greg Mendell to test against his createRDS driver script. Greg performed two days of testing and reran the E12 segments of data that had identified the bug. No problems were identified with the two-day run and all prior issues in LDAS and the createRDS script were shown to be fixed.
The LLO system was shutdown this week for hardware repairs and configuration issue. When the hardware was back online, we decided to install the prerelease of 1.5.0 there as well to provide more time for testing and evaluation. Only a documentation issue in the FAQ for the release was found to be in need of attention and now fixed in the official release.
The official release will be installed at LHO, LLO and CIT on Friday of this week. MIT is undergoing hardware maintenance and will not be upgraded to the official release until next week. LDAS-DEV and LDAS-TEST already have the official release running on them as of today.
S4 specific databases were generated at LHO and LLO on Wednesday of this week. They will be generated on CIT on Friday and MIT when it is available for upgrading to the new LDAS. The new S4 database will be made the default as each system is restarted with the 1.5.0 release.
The tandem systems are once again available to us after several months of waiting. We will begin upgrading these to LDAS 1.5.0 today.
TCLGLOBUS
Testing failed when using MyProxy delegated proxy certificate with the following error message: globus_xio_gsi: gss_acquire_cred failed. meaning there is no valid proxy certificate. We're still looking at the cause of the problem.
Fixed globus_io_read() and globus_io_register_read() issue on how to handle end-of-file flag at the SWIG layer.
Fixed globus_io_tcp_register_connect() issue on how to pass handle reference back at the Tcl layer.
Completed 2 Tcl scripts (asynchronous file copy and client/server) to exercise asynchronous functionalities of Globus I/O.
Two out of 96 SWIG-wrapped Globus I/O functions are still buggy. The functions are:
globus_io_register_select()
globus_io_secure_authorization_data_get_callback()
OSG
Naveen Palavalli is attending the OSG Integration Working Meeting in Chicago this week. The meeting intends to bring up the OSG Testbed at the 16 sites participating; LIGO Caltech is one of these sites. The LIGO-CIT-OSG site is now showing green afte a long week of preparation and installing software and properly configuring our OSG system from Chicago and here at home. The week got off to a slow start do to last minute availability of the hardware to be used for our OSG testbed. The hardware wasn't working at the time of Naveen's departure and a quick response by several members of the local LDAS software team got the system ready literally just in time for Naveens hands on training. The system currently has a gatekeeper and 3 nodes available. Remaining work includes installing condor and syncronizing the worker nodes with the gatekeeper. We officially passed the site verification tests performed by the OSG integration team.
(Dan Kozak)
(Phil Ehrens)
(Al Wilson)
(Stuart Anderson)
(Keith Bayer)
(Igor Yakushin)
(Greg Mendell)
(Ben Johnson)
(Keith)
(Shannon)
(Christine)
(Mike)
(Veronica)
Adv. LIGO
Systems
from Dennis
Coyne
See also: AL Systems
web page, AL
Systems email archives
Planning
Records Of Decision or Agreement (RODA)
See also the RODA
status web page
Requirements
Interface Issues
See the
"Interfaces" section of the AL Systems
web page
From: "Thomas
Frey" tfrey@ligo.caltech.edu
Progress Period from 01.28 to 02.18
Out of the office on
01.24,26,26,02.08, 09, and 10
·
See http://www.ligo.caltech.edu/~tfrey/index.html for a
complete listing of all project related cost and schedule data.
Accomplishments:
·
Sub-system PLANNING activities
§
Continued work on preparing web space for posting Adv. LIGO reports.
("The Whole Enchilada")
§
Continued work on the 40-Meter schedule changes.
§
Executed telecoms with Carol.
§
Finished work on AOS schedule changes.
§
Executed several meetings / telecoms regarding schedule and cost estimate
topics.
§
Finished preparing the progress update with progress through 01.31.05 and
posted data to web.
§
Started work preparing progress data requests for progress period ending
03.31.05.
·
ROSTER
DATABASE:
§
Assisting Irena as needed on record changes.
§
Continue to assist Irena with setting up her web site to accommodate
review of attachment As.
·
COST BOOK
DATABASE:
§
Posted current version of the cost estimate inclusive of AOS and IO
changes.
From: Ken Mason
<kmason@ligo.mit.edu>
Advanced LIGO Seismic Structure
SEI Structure:
86 0f 133 drawings have been completed and released by ASI.
They are now posting all drawings to their project web site as they are being
released.
ASI has sent to Ed Chargois hardware they purchased under the contract. This
consists of nuts, bolts, and the spring calibration fixture.
The buy-off meeting scheduled for 3/8 at ASI is still on schedule.
Actuators:
LBEC Technicians has finished termination and potting of the
6 Phase II large and small bobbins.
One small actuator has been integrated and tested. One large actuator has
been assembled and mounted to the test stand. Testing of the large
actuator was scheduled to be completed by monday
Integration and testing of the remaining 5 large and small actuators are
occurring this week and they will be shipped to us next week.
From: Janeen Romie
<romie_j@ligo.caltech.edu>
AdLIGO Suspensions
Working with the SUS team on the full quad structure fea. Even with my new
computer, Algor is troublesome. Algor support has been helpful and we continue
to work this. Working with SUS team on welding issues.
Collecting hardware lists from sus team to purchase nuts, bolts and associated
hardware. Tracking all this in PCard software.
Providing LIGO Lab SUS status/accomplishments and future plans to David.
Continuing to meet with Laurent every Tuesday at
Supporting Oddvar and Ken Mailand on their installation fixture designs.
Preparing for and meeting with Carol on SUS budgets and schedules.
Initial LIGO
Working with Doug, Betsy, Gari and Helena on the possibility of changing
out a suspension at LHO. Met with Phil Willems this morning about possibly
using an LOS structure prototype for a ring heater test.
Gin Gin
Researching availability of hardware for Stan and David.
From: Ken mailand
<kmailand@ligo.caltech.edu>
I'm currently learning solidworks, and
working on the lower suspension installation arm to move the lower suspension
into the BSC chamber. Also Im designing a platform for the modules for the BSC
chamber, to fit either the large or small port tube, and to allow positioning
possibilities to clear obstructions that may be near the chamber.
I spoke to Riccardo re. his previous experience with the air bake ovens, for
possible configurations and space requirements. This preliminary hardware
design showing an oven with a integral wash cleaning platform was sent for
quote, the hardware configuration was modified this week. The preliminary cost
estimate for this bake oven/cleaning station should be at CIT in a week.
I have requested a ball park baking estimate from NTS based on our visit, not a
quote, just an ROM for our budgeting use. We can use this with Astro-Pacs
cleaning estimate and other shipping and handling costs estimates to compare
with our in house estimate, for this task. I spoke to Michale Mize today and
NTS expects to have the ROM finished and to us by 2-23.
From: Bill Kells
<kells@ligo.caltech.edu>
Have now been spending focused time on the overview
plan for AdL COC (ie the budget plan issue). A big strategy in this is to learn as much as possible from our
LIGO I experience and those interferometers as test beds (eg HR scatter and TL
properties) to determine where the most effort is needed in further R&D.
From: Peter King pking@ligo.caltech.edu
AdvLIGO PSL
An exposure test of a different high power
photodiode has been underway for just over a week now without any detrimental
effects. Given that the device under test is the same as the one that
failed earlier, my conclusion is that the voltage regulator that failed was
just a bad regulator and that there is nothing basically wrong with
design. The photodetector under test has no heatsinking and is running at
about 375 mA of photocurrent.
A newer version of the boards for the photodetector is being laid out. This fixes the problems encountered in
changing versions of Protel.
From:
Michael Smith <smith@ligo.caltech.edu>
ZEMAX TRAINING COURSE
I attended a 5-day ZEMAX optical design training course: advanced optical
design including birefringent media and physical optics propagation.
40 METER
Made a revised layout of the output optics chamber to revise the steering
mirrors and beam splitter for the output mode matching telescope, the output
mode cleaner, and the in-vacuum AS photodetector.
ADLIGO
STRAY LIGHT CONTROL
In the process of updating the scattered light budget for Adv LIGO, with
emphasis on the recycing cavity scattering budget and the requirements for
scattering by MMT2.
From: Riccardo DeSalvo
<desalvo@ligo.caltech.edu>
We held a telecon with Alban and Jean Marie in
Juri
Im still working on my (simplified) FFT program for studying
the beam propagation in our Mexican Hat cavity; in particular I analyzed the
problem of the fundamental limitations of discrete and finite grids in order to
find the optimal choice for my simulation.
I sent an abstract for the conference Optics & Photonics 2005 which will be
on 31 July -
Erika
Doing a simutaion of the effect of de-centering using the
standard FFT program.
Marco (16 Feb)
OTF absestos removal works: for the next Tuesday an
inspection is scheduled. The works on the roof and the floor will be performed
the next week. The laboratory should be ready after my return from the
The PZTs driver is almost ready to be tested. The assembly will be completed
before the end of this week.
Machine shop oven didnt cook our blades because a broken resistor which
interrupted the cooking process.
The Rockwell hardness meter was re-calibrated and so we were able to measure
the real hardness of our maraging blades.
The result was a difference of 10 points of the C-Rockwell scale of the new
blades with respect with old blades (5 years old).
We are preparing to make comparative tests between ground surface and rolled
surface blades. We started the hardness comparison between uncooked maraging
grounded and grounded 20% oversize and then rolled to size samples. We are
waiting for the oven repair for a further test on the maraging hardening and
precipitation processes.
Creep experiment: today the temperature controller was turned to 190oC after a
week at 40oC. During that period the data sample was quite stable around
7.34mm.
Riccardo
Final draft of conference contribution for the Long Beach
ASME meeeting, available in http://www.ligo.caltech.edu/~desalvo/paper_asme-2005.doc
For additional information about this report, contact whitcomb_s@ligo.caltech.edu
