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The LIGO Executive Committee Agenda for Monday December 8, 2003 will be:
(Meeting time: 10:30 am Pacific Time)
Special Items:
no report
Laboratory Administration (Lindquist)
LIGO Weekly Site Telecon (Lindquist)
A site teleconference was held Thursday, December 4, 2003. The following ussues were discussed:
From: Ed Chargois <chargois_e@ligo.caltech.edu>
>From: Linda Turner - turner@ligo.caltech.edu>
ACCOMPLISHMENTS
ACTIVITY
| 12/04/03 | Packages | Faxes |
| In | 43 | 40 |
| Out | 26 | 45 |
Press here to access the DOCUMENT
CONTROL CENTER WEB PAGE.
From: Esther Cunningham <esther@ligo.caltech.edu>
Press here for ACCOUNTS PAYABLE HISTORY DATA.
From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>
From: irena@ligo.caltech.edu
(Irena Petrac)
LSC MOUs / Attachment Updates and Progress Reports
ACIGA:
SUPPORT (Baldon, Lloyd, Tischler)
>Irene Baldon
ADVANCED LIGO
(Cost Schedule Control Systems) T. Frey
From: Thomas Frey <tfrey@ligo.caltech.edu>
Accomplishments:
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/
Continued development of a proposal for implementing Primavera Project Planner Enterprise.
IO - Still need completed WBS dictionary and BOE. Continue to work on adding key milestones, consolidated logic, and preparing a status request for David Reitze.
SUS - No action items pending. Completed input of revised progress data / ETCs, and schedule changes.
LDAS - No action required at this point in time.
INSTALL - No action items pending.
DAQ - No action required at this point in time.
PM - No action required at this point in time.
FAC - No action required at this point in time.
SUP - No action required at this point in time.
Received notice that we will be issuing an update to the authorship list. Started to revisit the process of generating the list to refresh my memory.
Project Web Site for posting schedule and progress related data continues to be updated with the latest and greatest.
We continue to work the FY 2004 budgets. The next meeting is with
Gary on Monday.
The following change requests are open.
| CR-030015 | FY 2003 Livingston Observatory Detector Maintenance Expenses (Increment) | R. Wooley | July 14, 2003 |
| CR-030016 | Hanford Facilities 2.2--Divide the Large Equipment Access to Facilitate Movement of Large Items (currently assigned to FY 2004 liens list) | J. Worden | July 31, 2003 |
From: Cindy Akutagawa <cindy@ligo.caltech.edu>
Summary of Commissioning Activities at LIGO Hanford Observatory (compiled by M. Landry)
The holiday weekend was good for both IFOs,
allowing lengthy continuous
science mode stretches of 26 hours (H1) and
22 hours (H2). The H2 duty
cycle was up during the last week, 74% compared
to a S3 cumulative figure
of 58%. H1 held at its cumulative 63%.
H1 and H2 ranges are typical (2.5
and 0.9Mpc, respectively).
Pulsar hardware injections, on since the beginning of the run, were
turned off
in stages. The loudest pulsar was shut off on Wed Nov 26th, while
the rest
were shut down on Dec 1. Some weaker pulsars are expected to
be restarted
on Dec 22 for the duration of the run. Energetic burst and inspiral
waveforms
were injected
on Wednesday.
Comparisons between GPS and atomic clocks show a small, steady drift
of
about 50ns/day between the two. This is thought to be acceptably
small,
attributable to the atomic clock, within it's tolerance, and eminently
correctable.
Cumulative science-mode segments are now available
online with a latency
of only a few minutes.
At opportune times, PEM injections
were made in the LVEA. As part of these
investigations, the current ambient noise level at 50Hz was estimated
to
produce displacement noise at roughly the SRD. More injections
occured in
the outbuildings, with the conclusion, 'please don't drop hammers in
the Y-end
station'. The IFO was tellingly sensitive to impulses in
EY, compared to
other outbuildings.
4K IFO
The microseism was blamed for much of the downtime of the interferometers
this past week. However, a closer
look does necessarily support the anecdotes.
AS_Q fluctuations were investigated, here
and here.
It was suggested
that the stability in the 2k range compared to that of the 4k
is due to its spectrum being dominated by (stationary) lines, in the
region of
interest.
2K IFO
Early last week it was observed that the AS3I_CORR signal was dominated
by
motion at 1Hz. Some ASC loop shaping was attempted to knock this
down,
but as this did not help AS3I situation, AS3 was removed from AS_Q,
and
now we are running on AS2
only.
DAQ
Slow channels from the EDCU had spurious values at times; this is being
investigated.
---------------------------------------------------------------------
S3
--------------------------------------------------------------------
Continued problems maintaining lock in L1. The
dominant losses of duty
factor have been logging (as usual), thunderstorm
activity and
exceptionally high microseism.
However, we are also experiencing stability problems with our WFS
system. Due to the compressed commissioning time before the run, we
did
not arrive at a suitable angular control configuration for our recycling
cavity. Without these degrees of freedom under wavefront control,
sensing for the other degrees of freedom falls victim to interference
from their fluctuations. The current theory is that this might explain
our sporadic mysterious "phase wander" in the otherwise robust WFS1
sensor, which is controlling differential arm cavity alignment. We
are
discussing a proposal to rig new controls for the recycling mirror
and
differential ITM alignment, even though this investment
will absorb some (scarce and precious) locking time. An intensive
analysis offline by Rana Adhikari and Gregg Harry indicates there
may be a clean solution that eluded us before.
Poorly-understood impulsive events also appear to be unlocking the
machine even in the absence of seismic or alignment anomalies. We
believe we have evidence of high-speed bursts in the mode cleaner or
PSL
controls (or the laser itself), but because they are intermittent we
have
not been able to catch them in the act and isolate them. With the
interferometer proper shut down, we have observed spontaneous unlocking
of the mode cleaner as frequently as several times per hour. We are
concentrating all available resources on this problem.
Safety/security (Rich Riesen)
---------------------------------------------------------------------
No significant entries for this week.
LDAS (Yakushin)
---------------------------------------------------------------------
1) Debugging scripts for burst MDC frame production. Testing the frames
using waveburst.
2) Working on line removal algorithm for waveburst.
General Computing (Roddy)
---------------------------------------------------------------------
Implemented a new backup system for our main file server and our web
server. The machines back up to our RAID server and keeps several
versions on spinning media. This will later be implemented to
back up
to tape also. This process seems to be working really well.
Working with Allen and Excel to plan the changes to the computer user's
room so that we can move the GC servers out of the communications
room.
Trying to get a problem fixed with ITS at Caltech with the
software.caltech.edu download site. Downloads almost always fail
from
this site. I have tried to get it set up so that I do not have
to use
the VPN to download software. They claim that that has been done,
however I still cannot download from Livingston. When I use the
VPN the
download is allowed, however it almost always fails. I have had
to use
some other means to get the software most of the time.
Applied several security patches to some Linux boxes on the network.
This is to fix the root exploit that was announced for the Linux kernel.
Still working with LSU on the GigE network upgrade and also waiting
on a
response from them on the UDP packet problems between Hanford and
Livingston.
Working with RuthAnne at Caltech on setting up several ITS/VPN accounts.
Most of Monday was spent working with the Pcard software. Seems
that my
version of the Oracle software that was provided by Caltech is corrupt.
Either that, or it will not install with the latest service pack
installed on Windows 2000. It took quite a while to get a copy
from
oracle.com that would work with the Pcard software from Caltech.
However, the freely downloadable Oracle clients (version 8.x.x) seem
to
work. It is a newer version than what Caltech provided us with.
Also
looking into the mac client that Caltech has. There are two people
with
a Mac at Livingston with a Pcard.
LLO Seismic Retrofit and L1 Detector TLC (Rich Abbott)
---------------------------------------------------------------------
Working on HEPI electronics with Ben and Flavio. The first boards
will
go to the board house tomorrow as part of the big build. Ordered
50
chassis yesterday for the electronics to live in. The priority
is to
complete the components for the hydraulic pump and support electronics
first and then to complete the remainder of the electronics as a
simultaneous massive block. Excel has done a good job on the
pump
controller box and has responded to some changes as they arose during
the design. I anticipate they will be done within two weeks.
LLO Seismic Retrofit (Ben Abbott)
---------------------------------------------------------------------
I am working with Rich on the HEPI system. I am working out the
cabling issues involved in making HEPI conform with the new RFI
protocols. Some interesting points include using media converters
on
the ethernet signals so that the ethernet can be brought into the rack
and crates on an optical fiber then changed back to copper inside the
VME crate, and the use of a custom designed back panel with RFI
feedthroughs into the crates.
LLO Seismic retrofit (Kern)
---------------------------------------------------------------------
Welded assembly of the first article actuator was completed and successfully
leak checked last week. 3 more are being assembled. The shop
manufacturing
the balance of parts for the remaining 84 sets is on track to deliver
them
in ~2 weeks. Working on completing the final bill of materials for
HEPI, and
ordering much miscellaneous hardware and minor purchased parts.
Ordered
thru-hole load cells and displays for the springs. Ordered our custom
4-way
valve for the bypass tree. Working with Ken Mailand on the pump station
and
manifolds, and we've asked a few local shops for estimates to fabricate
the
pump station frames. Striving to complete the Mechanical Installation
RFQ
for piping installation. Mike, Rus, Allen and Rich A began a
critical look
at the installation schedule and staffing requirements.
E2E Input Optics Modeling (T. Findley, N. Jamal, K. Rogillo, and S.
Yoshida)
---------------------------------------------------------------------
We had a productive week. H. Yamamoto installed the most recent version
of
e2e. This enables us to calculate optical power coupling to higher
order modes
with much higher accuracy. T. Findley calculated the power coupling
to higher
order modes due to motions of MMT optics. When a realistic mechanical
disturbance was given to the suspension points of all MMT suspensions,
the
calcualtion showed that the MMT3 output beam could have as high as
0.5% of
intermittent coupling to higher order modes (typically for ~1 sec,
two or
three times in 10 sec). K. Rogillio continued the analysis of HAM table
top
motions. Nafis Jamal joined our group. He made an e2e box to analytically
calculate optical power coupling to higher order modes for given translational
and/or rotational misalignment of the incident beam to an optical cavity.
This
box will be used to verify the above-mentioned numerical results obtained
by
T. Findley's calculation.
no report
Since our last report, we have discovered that
our Sapphire mirrors do
not meet design spec. The coatings
were applied to the wrong sides of
the mirrors. The AR coatings were applied to the concave sides, and
the
HR coatings to the flat, wedged back sides, making it impossible to
form
a resonant cavity with these mirrors. We contacted the vendor (REO),
and
they have agreed to correct the problem. As of this writing, however,
we
do not have an estimate of how long this will take.
We removed the two Sapphire optics already installed and began
reinstalling the fused-silica masses, so that we can perform additional
measurements on them while the Sapphire optics are being recoated.
no report
--------------------------------------------------------------
SIMULATION AND MODELING (Bhawal)
Weekly Physics meeting
------------------------
Luca, Matt, Biplab discussed about status of interferometers at LHO
and noise curves and Matt's linear noise model.
Linear Noise Model
------------------------
(Matt)
Incorporated new conlog and filter file readers into LinLIGO
to
completely reproduce the state of digital system, as well as
the digital
settings that are applied to hardware filters. Next release
of LinLIGO,
due in two weeks, will include full H1 model with CM servo.
FFT, E2E & FFT's Matlab interface
-----------------------------------
(Biplab)
Submitted a technical note on "E2E and FFT: How to compare results"
to DCC with LIGO document no. T030284-00-E.
WFS signals have been calculated for various heated states of
interferometer
using FFT and the matlab interface code. A bug in the newly
modified FFT
code is fixed and differences with E2E in the final hot state
have been
sorted out.
Code development and maintenance
----------------------------------
(Melody)
C++ FUNC:
Work is underway to provide more functionality for the C++ based
FUNC.
Incorportated Matt's hashCode routines to find and validate the
FUNC's
corresponding shared library object. Implemented the shared
object's
retrieval of the values from the macro database.
Currently working on linking the libAdlibMM.a archive to the
shared library
and using the system's configuration options in the compile and
linking
process.
LIGO DATA ANALYSIS SYSTEM SOFTWARE (Blackburn)
The frame query option used to identify uniquely the data set
of interest in an LDAS job is being reworked to resolve some of
the ambiguities seen in user requests during the science run.
All queries that have presented problems to users could be
restated in the frame query option to remove the ambiguies and
acheive the desired data set for input to the jobs. This is
aimed at making sure the dataset requested is always right.
The rework is expected to effect code changes in both the
frameAPI and the diskCacheAPI.
The controlMonitorAPI is being enhanced to allow graphical
visualization of integer and floating point data in the LDAS
database as timeseries and as histograms. The draft code has
been demonstrated and reviewed by the group. I expect this to
be a tremendously useful tool for monitoring scientific results
which are stored in the database. This functionality required
a minor change in the database table design which is transparent
to LDAS and the search codes.
We were able to compile the TCL/TK interpreter with optimizations
this week on the LDAS-DEV (development)) system. This significantly
improved the performance of the single threaded diskCacheAPI (about
a factor of two). But it also allowed us to identify that the major
bottleneck for data pipeline jobs is due to this single threaded
implementation of the diskCacheAPI. The original design carried a
multi-threaded version of the diskCacheAPI, but time constraints
required us to implement this first as a single threaded application
to support the science runs. We have begun the rework necessary to
migrate functionality into C++ to enable multi-threaded support,
but the pressure to get the 1.0.0 release of LDAS out ASAP may
preclude having this in that next release of the software.
After running for one week with the STLPort Standard Template
Library, it now looks like we have only a small memory leak, if
any, in the frameAPI. We we conduct code reviews of the frameAPI
and frameCPP use of the String class to see if there is some clean
up we have overlooked, but the potential leak is very small and not
considered to be a show stopper for the next release. We have also
made changes to the software configuration scripts to support the
use of STLPort with and without its internal debugging features.
We also determined that the lseek() function calls which impact
the I/O rates in the frameAPI are still present with the STLPort
code and are currently investigating a solution that is based on
a derived class over the iostream class to manage more metadata
and remove the excess lseek() calls.
Developed a system level test to compare the differences between
a stochastic analysis using RAW / RDS / NDAS frames. The RAW and
RDS frames gave identical results. The NDAS frames gave slightly
different results which required further investigations. It was
determined that the input data into the stochastic DSO agreed at
the level of floating point presision and the deviation was due
to sensitivities in the DSO to these small variations. The data-
base N-Tuples test has been updated to work with the newest LAL
release and now passes again. A new waveburst DSO test has been
added to the nightly LDAS system tests.
The generation and replication of RDS frames at the observatories,
Caltech and Tier II centers continues to run smoothly. A power
outage at LLO two weekends ago require some hands on effort to
get everything going again. Also the HPSS group at CACR opened
a door on the tape storage silo which triggered a previously un-
seen failure in SAM/QFS that interupted RDS generation and
replication at Caltech for about half a day. RDS frames feel to
about 6 hours behind schedule as a result of this failure, but
once it was traced and the associated Sun Servers were rebooted,
RDS generation and replication quickly caught up.
LIGO DATA ANALYSIS SYSTEM HARDWARE (Anderson)
Caltech
-------
(Dan Kozak)
* Got HPSS running again (and again and again), finished pulling E7
data
into SAM-QFS, started getting older engineering run data.
* Continue to try to understand the workings of SAM's releaser.
* Did lots of attribute maintenance in /archive.
* Did lots of work on scripts to automate transfer of data between the
observatories and CIT via SAM-QFS tape.
* Received more L0 data from observatories--so far every file that should
be on the tapes is and can be successfully staged and FrCheck'd.
* Working on a procedure to manage tape 'MEDIA ERROR' conditions in
SAM.
Have dealt with (by hand) several occurences of files failing
to stage
because the tape they're on is marked 'MEDIA ERROR'.
* Helped with recovery after LLO power outage (mainly checking QFS
filesystem).
(Hari Pulapaka)
* Installed Ganglia on CIT cluster.
* Monitored LDR at CIT, LLO, LHO and MIT. There were some problems,
had
to restart LDR and its associated programs a couple of times.
* Added accounts for Rejean Dupuis under the group account lsc-uk, so
that he can use the Condor pool.
* Updated the condor_dagman program on ldas-grid.
(Al Wilson)
* Replace video card and monitor on m71. This was done to cure digital
sparkles and not the memory over run problem. It might cure
it due to
a new driver being loaded for X.
* Set up BB to monitor IDE raid drives. This will check the health
and well
being of these systems.
* Change print queue servers on desktop machines.
* Added users for monitoring jobs on LDAS.
Hanford
-------
(Ben Johnson)
* minute and second trend data is now being archived at both
observatories, as well as the DMT trends (_not_ archiving the
spectrum
archiver directories though).
* Working with Daniel Sigg on smoothing out the user experience of
using dtt/dmt/etc. with data on samfs filesystems.
* t3-26 is now ready to be used as a backup filesystem. It is mounted
as /backups on oldmetaserver (the Sun E450). Working on getting
the old
backup script working with our current configuration.
* fixed big brother temperature script. It now reports all temperatures
on the V880 and the 280R servers.
DATA ANALYSIS ACTIVITIES (Lazzarini)
(Greg Mendell)
1) Mike Landry and I have started writing a version of our StackSlide
code to run under Condor and the Grid.
2) Used dtt, the knownpulsardemod DSO and the stackslide DSO to
investigate the injected pulsars in the S3 data. I made plots
using dtt
of the power spectrum and coherence for AS_Q and ETMX_EXC_DAQ for H1
and
H2. A band width of .005 Hz, Hanning windows with 50% overlap,
and 10
averages were used in all cases. The xml files that can reproduce these
plots in dtt are in /opt/CDS/g/dtt/gmendell on the LHO cds network.
All
the pulsars looked pretty much as we expected, with nothing seen that
would have an effect on the other analyses. However, to be conservative
and address any unexpected concerns that might come up, the PULG group
has switched off all the injected pulsars for now. These will
remain
off for the next three weeks, to allow comparisons between periods
of
injections and no injections to directly verify that the effects of
the
injects are exactly as we expect.
(Igor Yakushin)
1) Debugging scripts for burst MDC frame production. Testing the frames
using waveburst.
2) Working on line removal algorithm for waveburst.
(Peter Shawhan)
1) More veto studies for the S2 inspiral analysis
2) Reviewing the Externally Triggered Burst Search
3) Hardware signal injection studies
4) Set up software to update S3 segment lists every 5 minutes, and added
links to the main S3 web page
GENERAL COMPUTING (Wallace)
MIT:
(Keith)
Nothing to report
Livingston:
(Shannon)
-Implemented a new backup system for our main file server and our web
server. The machines back up to our RAID server and keeps
several
versions on spinning media. This will later be implemented
to back up
to tape also. This process seems to be working really well.
-Working with Allen and Excel to plan the changes to the computer user's
room so that we can move the GC servers out of the communications
room.
-Trying to get a problem fixed with ITS at Caltech with the
software.caltech.edu download site. Downloads almost always
fail from
this site. I have tried to get it set up so that I do not
have to use
the VPN to download software. They claim that that has
been done,
however I still cannot download from Livingston. When I
use the VPN
the download is allowed, however it almost always fails.
I have had to
use some other means to get the software most of the time.
-Applied several security patches to some Linux boxes on the network.
This is to fix the root exploit that was announced for the Linux
kernel.
-Still working with LSU on the GigE network upgrade and also waiting
on
a response from them on the UDP packet problems between Hanford
and
Livingston.
-Working with RuthAnne at Caltech on setting up several ITS/VPN accounts.
-Most of Monday was spent working with the Pcard software. Seems
that
my version of the Oracle software that was provided by Caltech
is
corrupt. Either that, or it will not install with the latest
service
pack installed on Windows 2000. It took quite a while to
get a copy
from oracle.com that would work with the Pcard software from
Caltech.
However, the freely downloadable Oracle clients (version 8.x.x)
seem to
work. It is a newer version than what Caltech provided
us with. Also
looking into the mac client that Caltech has. There are
two people
with a Mac at Livingston with a Pcard.
Hanford:
(Christine)
- Worked with Lisa and Larry to get rid of spam e-mail being sent to
people at ligo-wa through their ligo e-mail addresses.
- Put together an FY04 expenses report for Fred and myself.
- Purchased the latest version of Exceed software and the rest of the
wireless AP upgrades.
- Setup network hubs in one of the conference rooms for the PAC meeting.
- Last week I setup the new color printer and generated installation
instructions.
- Troubleshooting a problem with one of the old wireless access
points.
- General user support.
CIT:
(Mike)
-Loaded another laptop for Ken Mailand with engineering software.
The other laptop I loaned him was to slow, for the type of work
he has to do.
-Worked up on Millikan 6th floor, regarding a printing problem.
After spending many hours fixing this printer, the control panel
flashes new error message (needs maintenance kit installed.)
I
called High Performance for this.
-Cleaned up Calum Torrie's computer, for it was infected with a virus.
-Updated all our Ansys 7.1 users with current Ansys & windows patches.
-Swapped out a network switch up in Gary Sanders/Cindy/Ryan's office.
This was to add additional network ports for that area.
-Loaded additional software on Linda Turner's laptop.
-Loaded a VRVS computer for ECR. This included installing additional
hardware & software. This is still in testing mode.
-Loaded a laptop for Ben Abbott to take on travel. This laptop
needed additional engineering software loaded besides General
Computing software. Plus I this laptop needed to be loaded with
XP
pro.
-Ran end of month ghost backups on all NTSRV's.
- Reloaded three laptops for the loaner pool.
-(PICTOR)This server was having some problems crashing (blue screen)
due to OS errors. After rebooting I looked at the system logs
and
notice multiple error messages (D1410D failed to start Event
ID:7000)
I did a registry search for this and found the D1410D keys, which
I
deleted. I rebooted and everything seems to be running ok. The
error
messages are gone and this server is back up and running again.
(Lisa)
- Worked on a nis+ problem with the mail aliases. There seems
to be
a problem with getting the nis+ logs checkpointed, but more
testing
needs to be done on this.
- Spent quite a lot of time in the 40meter. Got the first 450
running
for them. Moved all of their critical data from the failing
disk to
the 450. Redesigned all of the nfs mounts. Propagated
changes through
5 machines. Worked on a hardware problem with their gateway
server.
The onboard ethernet was unable to acquire sync with the switch.
I
swapped out the existing hardware for another u30.
- Looked at an nfs problem between ran and halfdome.
- Did monthly backups.
- Before thanksgiving, I was in hanford working on a new mailserver
for
them.
(Veronica)
- LIGO: Working on the Aspen 2004 Winter conference webpages. Posted
various updates to the LIGO website.
Working with George Stokes and the rest of the computer group
on the
upgrade of the DCC database.
Prepared a high-resolution image of Kip Thorne for a science
publisher.
Encoded videos of the presentations made at the last NSF review,
burned
them on a CD for distribution and prepared for streaming. It
was later
decided that they not be posted, but it provided another good
opportunity
to run and smooth out the capturing/encoding process.
- LSC website: Posting a bulk of recently arrived MOUs and some late
presentations from the November meeting, as well as updates
to the
website.
- CaJAGWR website: Taped and encoded the video of the last seminar.
The
video is ready to be posted for streaming. Updated the website
and
provided some user support.
(Bruce Sears)
* Systems Work:
(5.0 days)
- Ilog upgrade to implement entry editing features.
(Larry)
-Spent time working on a number of procurement issues. The s/w
licensing has been renewed for Matlab, the Trisync s/w has been
upgraded to 5 seats, the ligo.org domain name has been reserved
for the next 5 years. Working on a number of different laptop
purchases.
-Repaired a couple of printers. There are a couple of printers
that are worn out and will be replaced within the next few months.
-In the process of rebuilding a couple of PC's.
-Worked out a number of e-mail issues. Lisa and I have been
spending a number of hours each day, resolving false positives
and adding systems to be blocked.
-Helped out the DCC with a couple of issues. There are a few
logistical items to be looked at as they standardize things in
the group.
-The regular help in setting up accounts and resolving different
user issues.
Advanced LIGO Seismic Structure (Larry Jones)
Structure Development Contract:
The contract kick-off meeting was held on Dec 2 at LLO, starting with a facility tour for the ASI visitors and wrapping up with a discussion of ASI's implementation plan and design requirements. ASI plans to start with tasks on pod preliminary design and spring/flexure parametric design, since these areas are critical to the rest of the configuration. They plan to add intermediate design reviews for these tasks (Pod on 12/24, Spring/Flexure on 1/12) as well as one for the HAM/BSC Configuration (2/17).
Actuator Testing and Redesign:
The RGA scans of the small actuator's wound bobbin and magnet/frame assembly did not necessarily show them as unacceptable. It turns out that the background scans of the empty oven are essentially the same value, and this magnitude of outgassing does not meet the highly stringent levels assumed for Advanced LIGO operation. Calculation errors had been made previously, which confused this comparison
Nov 20 - Dec 3rd
ADLIGO Suspensions
Supported the NSF review in
Working with Russell Jones, Mark Barton and CalumTorrie
on getting more data points for the MC modal testing. The values
we measured compare favorably with the fea
work in IDEAS and ANSYS. Now, we have a matrix of measurements and fea
results for different MC configurations such that we can further explore
ways to stiffen up the structure. Mike in the machine shop is making up
a set of stiffening plates that should be ready to test on Friday. A write
up of the results should be ready soon.
From: ctorrie <ctorrie@ligo.caltech.edu>
Visit
Russell Jones visited Caltech from Glasgow for 2 weeks in November. During this time we worked on the following subjects.
Blade Eddy Current Damper
Coil drawings and ordering for the controls prototype
Catcher PDS for the PDR, including considering aspects of the MC and
ETM
During his visit Russell and I worked on the above and also on the following: -
Learned ANSYS by considering an MC and applying knowledge specifically
to the RM upper blade wrt its internal mode.
Worked on the experimental and FEA analysis of the MC structure
Played with and assembled stages of the MC suspension
Analysis of the MC, RM and ETM suspension. Considering clamping, lumped mass, stiffening members and bare versus fully assembled structures?
I am sure Russell will summarise his
visit as well as hopefully write up several sections to incorporate all
of the useful work he was involved in during his visit. Obviously a lot
of this work was done in conjunction with others and therefore there will
be support from myself and others to aid with this request for reports.
Structure Analysis Experimental (on the existing MC) and FEA with Ansys
Ongoing. Full report to follow.
Recycling Mirror
Mike Perreur Lloyd, Alastair Grant and I are working on various aspects related to the RM suspension. This is in an attempt to tidy up various section we have been working on.
Blade Test Facility and RAL visit to
I have been working with Ian Wilmut from
RAL to discuss several concepts he has proposed related to the RAL blade
test facility. Caroline, Justin, Ian and I also set up a schedule to aid
with Ian's visit to
Advanced LIGO SUS
After an intricate procedure, I obtained a letter of permission from
DuPont to make 3 purchases of 100 ml of Teflon
AF in the next 2 years.
The objective is to have the material tested.
Received SF2 glass substrates; they need to be polished flat before
running silicate bonding tests.
Advanced LIGO Coating Development
Received some coated substrates from CSIRO. This was a trial run to
evaluate their coatings, which we are in the process of characterizing.
From: GariLynn Billingsley
<Billingsley_G@ligo.caltech.edu>
We are working with the folks at Stanford on calibration methods for the Absorption Scanner. The laser has been delivered and is installed, but is not running in TEMoo mode. Liyuan is working with the company to re-align. All infrastructure/mechanical modification is in place.
The 250mm sapphire from
The 40m lab has allowed us to use one of their spare fused silica 311SV
TMs for annealing tests. It is on its way to Steve Penn. There
has also been a piece identified at Virgo that we might be able to use.
From: Bill Kells <kells@ligo.caltech.edu>
Mostly last week: took post thanksgiving shifts at LHO.
Then, just back, have been fielding issues on:
1. Best measurement strategies for OTF studies of LIGO I optics (eg. removed ITMx)
2. Calculations of effects of various arm cavity losses (eg
anomalous scatter) on
AdL. performance.
PHOTON DRIVE R&D
Awaiting replacement of the 500 mW laser.
Maddalena:
In this week I finished to prepare the control circuit for the seismic
attenuation system. Me and Riccardo
have analyzed some measurement about maraging
spring changing the k value of the system.
In the cryolab I run the ChiaraVanni
sequence about MoRuB thermal conductivity
and I began to analyze this data.
Barbara:
In this week we choose the lens for the mexican
hat test optical apparatus to reduce the laser astigmatism and I
designed the support for the laser. Also I 'm studying
the theoretical part of resonance cavity.
Francesco Costagliola
Working on report.
EnricoCampagna
Working on report.
Riccardo
Evaluating Newtonian Noise reduction techniques.
For additional information about this report, contact sanders@ligo.caltech.edu