Weekly Report for
Week Ending March 24, 2005
The LIGO Executive Committee
Agenda for Monday March
28, 2005 will be:
(Meeting time: 10:30 am Pacific Time)
- Announcements
- Comments on Weekly Report
- LSC Issues (Saulson)
- LIGO Lab Operations
- Administration
(Lindquist)
- Sites (Raab,
Zucker, Shoemaker)
- Commissioning (Fritschel),
Detector (Coyne)
- Campus Research
Facilities
- 40 Meter
(Weinstein)
- TN, ( Libbrecht)
- LASTI (Shoemaker)
- Data Analysis and
Computing (Lazzarini)
- R&D and Advanced LIGO
(Shoemaker)
- CHANGE CONTROL BOARD/TECHNICAL REVIEW BOARD SESSION AS NEEDED
Special Items:
Special Announcements:
Weekly Report
Highlights
S4 Statistics
Hanford: overall duty cycles of the IFOs were 80.5% on H1, and 81.3%
on H2. Lock stretches on H1 tended to be longer (114 segments comprise
the H1 data set, whereas 195 segments comprise H2's). Longest locks were
similar: 23.0 hours on H1, 22.8 hours on H2. Mean ranges were 7.5Mpc on
H1 and 3.2Mpc on H2. These numbers meet or exceed our goals for S4.
Livingston: cruised through the end of S4 in style, with solid 7 Mpc
inspiral range and daily uptimes exceeding 90% despite over 170 visitors (and
their cars) assembled for the LSC meeting. L1 finished with a total uptime over
72% including power failures, earthquakes and everything else.
LSC Issues (Saulson)
No report
LIGO Laboratory
Administration (Lindquist)
STATUS OF MOUs (Petrac)
LSC MOUs and Research Plans and Progress Reports
Non-LSC MOUs
SITE TELECONFERENCE (Lindquist)
No site teleconference was held on Thursday, March 24, 2005. The meeting was
preempted by the LSC meeting.
- The
list of assigned actions updated through March 10, 2005 will be found Here.
PROPERTY MANAGEMENT (Chargois)
>From: Ed Chargois <chargois_e@ligo.caltech.edu>
- Nothing
significant to report.
Currently supporting campus wide inventory.
DOCUMENT CONTROL CENTER (Turner, Mak)
>From: Linda Turner - turner@ligo.caltech.edu>
- Attended
and handled documentation at the LSC meeting in Louisiana. Only a dozen presentations remain
to be submitted. Over 100
documents were received and posted, and appreciation from the attendees
for the quick turnaround seemed real.
>From: Cleveland Mak <mak_c@ligo.caltech.edu>
- packages:
in - 20, out - 7
- faxes:
in - 23, out - 21
- Efforts
this week focused mainly on processing presentations from LSC Meeting at
Livingston.
COST SCHEDULE CONTROL SYSTEMS (Cunningham, Brambila, Kaufman, Salone)
>From: Esther Cunningham <esther@ligo.caltech.edu>
>From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>
- Completed
change order #28 to MIT to allocate the balance of 6 months funding to
carry us through Sep 2005. The change order has been routed for the
corresponding Caltech approvals.
- Followed
up and received several change order acknowledgements on subcontracts.
Also, followed up and received two signed Release of Claims to close out a
subcontract. Distributed copies of this signed Release.
- Working
on the change order to Galli and Morelli.
>From: Gina Salone <gsalone@ligo.caltech.edu>
- No
special activities to report.
>From: Florence Kaufman <fkaufman>
- Continued
working on updating reports for March 2005 activity.
- Worked
on a modification to the monthly report for Operations to summarize
budgets, expenditures and commitments into three major categories Labor,
Travel and Other Purchases.
Each category will include the Indirect Cost related to it.
- Financial
reports can be found at: http://docuserv.ligo.caltech.edu/~fireport.
(For passwords contact Florence)
SUBCONTRACTS MANAGEMENT (Petrac, Jasnow)
>From: irena@ligo.caltech.edu (Irena Petrac)
>From: Ed Jasnow <jasnow@ligo.caltech.edu>
SUPPORT (Baldon, Lloyd)
>Irene Baldon
- Processed
the paper work for three (3) new/revised trips. At this time there are three (3) new trips that need to
be completed and ticketed before the paper work can be completed. Assisted several LIGO personnel
with their travel arrangements using their P-Cards and made several
reservations for outside visitors coming to LIGO/Caltech for meetings
and/or workshops.
- Completed
twenty-two (22) Expense Reports and there are zero (0) 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 there is one (1) report more than 30 days old. Travel Audit's new policy of
accepting only original signatures seriously holds up the process of
closing reports. I have three
(3) waiting for signature at this time.
>Dorothy Lloyd
- Processed
the usual invoices for payment. Tracked and followed up on invoice
problems. Reviewed and recorded payments processed by Esther the week of
March 14.
- Processed
requisitions for standard purchases, payment requests and change orders.
For more detail see Cost Schedule Control Systems report by Ruth
Brambilla.
- Jim
continued with data entry in the LIGO database and helping out in the DCC.
PROPOSALS and REPORTS (Lindquist)
The time has come for us to begin work on the Annual Report for the
Visitor’s Program. I will be
contacting those assigned visitors for the information needed to prepare the
report. This will include a brief
statement of the work undertaken or accomplished (if we have not already been
provided one by the visitor) as well as potential benefits inside and outside
of LIGO, for Outreach, etc.
DCC Steering Committee (Lindquist)
There was no meeting of the DCC Steering Committee this week. The next meeting is tentatively
scheduled for Wednesday morning (PST), March 30, 2005.
CHANGE CONTROL/CONTINGENCY MANAGEMENT (Lindquist)
HUMAN RESOURCES (Akutagawa)
>From: Cindy Akutagawa <cindy@ligo.caltech.edu>
- No special
activities to report.
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 (Landry)
Some S4 closeout stats: overall
duty cycles of the IFOs were 80.5% on H1, and 81.3% on H2. Lock stretches
on H1 tended to be longer (114 segments comprise the H1 data set, whereas 195
segments comprise H2's). Longest locks were similar: 23.0 hours on H1,
22.8 hours on H2. Mean ranges were 7.5Mpc on H1 and 3.2Mpc on H2.
These numbers meet or exceed our goals for S4.
Some selected elogs from the
last week of S4 are linked below:
- even
modest earthquakes
continue to be a primary source of lock loss
- coherence
between AS_Q of the two LHO IFOs shows novel structure
- late
in the run, two new binary pulsars were injected
in hardware for recovery by time-domain and Fstat-binary search codes
- the
2k laser showed signs of deterioration
this week, glitching in power. We may be in a bad
mode hop region. Problems with the laser remain in the post-run
freeze.
- as
part of the suite of calibration measurements, cavity
poles were measured on both interferometers after the run
LIGO Livingston
Observatory (LLO) and Interferometer Operations (Zucker)
S4 Report
We cruised through the end of S4 in style, with solid 7 Mpc inspiral range
and daily uptimes exceeding 90% despite over 170 visitors (and their cars)
assembled for the LSC meeting. L1 finished with a total uptime over 72%
including power failures, earthquakes and everything else.
This was a team effort in every way so it's hard to single out an MVP, but
I'd like to give a shout to some personal heroes:
- the HEPI crew, who finally gave us a quiet 'site'
- the commissioning team, who rigged a clean machine
- the detchar and analysis groups, who gave instant
feedback to keep it so
- experts Gary, Doug, Radar, Tom, Danny, Harry and Joe
in the pilot's seat
- RunMeister O'Reilly cracking that whip
WELL DONE EVERYBODY!
Now to that S5 punchlist...
Education and Outreach
Mike and John are in San
Francisco looking at (OK, OK, playing with) candidate exhibits for the Science
Education Center.
LLO Community
The LSC meeting at LLO was a huge success. Many thanks to everyone who put
in hard work and long hours (including their days off) to organize and support
the conference.
As always, here the MVP has to go to Bonnie, who somehow found a way to
outdo herself yet again. THANKS!
L1 and AdL Mechanical Engineering (Spjeld)
Most of the week spent in LSC meetings
AdL Quad SUS Installation
Fixtures
- Redesign of fixtures in progress; stiffening of
lift-frame.
- Awaiting quote for IDC linear drives.
- Additional FEA on lift-frame in progress.
AdL SEI Engineering Effort
- Create drawings from existing assembly and actuator
tooling in progress.
- Looking into assembly procedure outline based on
existing storyboard.
LLO Outreach Facility - Pendulum Exhibit Wall
- Contacted Rig-Rite for quotation on elliptical
aluminum extrusions.
- Contacted a few other manufacturers of Al extruded
profiles for quotes.
- Looked into ball bearing fatigue issue; oversized
bearing should be ok.
- Determining shaft diameter requirement for carrying
weight of pendulums.
- New solid model CAD pendulum wall assembly in
progress.
- Waiting to hear back from designers on prototype.
General Engineering
- Received and installed 3D file conversion software
for NSF animation.
LLO General Computing and LIGO Computing Security (Roddy)
- repaired the backup server. The power outage took out the motherboard and the
system drive on this server.
A full backup now uses 13 AIT2 tapes and >48 hours to run. The user home directories are now
using about 1/2 terabyte.
- Most of this week was spent supporting the LSC
meeting other than miscellaneous items.
- Worked on numerous support contract and licensing
issues with Sun. Received an
amended quote from them for our servers here. We dropped the E450 since it will be replaced soon.
HPLF, Optics Modeling, Data Analysis and L1 Commissioning (Franzen)
- Participated in the LSC meeting.
- IPG has been testing the HPLF laser at full power
continous running since a week back. No news on the outcome yet.
LDAS/Condor Sysadmin and Burst Analysis (Yakushin)
Data archiving/Condor/LDAS admin:
- Talking to SUN about extending our hardware contract.
Almost ready to sign it.
- Helping users at grid workshop to set up their
accounts.
Data analysis:
- Attended LSC meeting, burst f2f and grid workshop.
- Presented the results of the S4 online analysis at
ASIS.
Initial LIGO Detector Science & Engineering
(Coyne)
No report.
40 Meter Interferometer (Weinstein)
No report.
Thermal Noise Interferometer (Black)
The new computer is in place and working well for locking the
instrument. Jay and Alex are still
working on the data logger, but expect to have it finished soon.
For the shadow sensor on the bond-noise experiment, the tower is built, and
the optics are in place. Akira is working on getting the electronics put
together and measuring a preliminary signal, in air, for a wire suspension.
LASTI (Ottaway)
No report.
Data Analysis and Computing (Lazzarini)
Simulation and Modeling (Bhawal)
LSC meeting
Hiro and Biplab attended LSC
meeting at LLO. Biplab gave a talk
on "Effect of Thermal Lensing on WFS (FFT study)" (G050112) in
detector characterization session.
LLO input beam
(Hiro) Based on the discussion
with Andri, Sany and Rana, it is very likely that the input beam was adjusted
to match to the mode defined by the arm when the ITM is cold. This means that the waist position of
the input beam is off by 450m and the radius of the curvature of the beam is
10km on the HR side of recycling mirror whose radius of curvature is 15.8km. Thermal Compensation addresses the
curvature mismatch of the SB and ITM curvature, and this curvature mismatch
between the input beam and recycling mirror cannot be addressed. The effect due to this large
displacement of the input beam waist is being investigated using FFT.
Mechanical simulation
(From Hiro) Sany Yoshida is
coming to Caltech next week to take over the modeling of the suspension from
Virginio. Preparatory work was done among Sany, Hiro and Virginio this week.
This is for LIGO I commissioning. One major goal of this work is to implement
the violin mode in the e2e simulation, and to study the actuation of violin
modes by LSC/ASC. Another goal is to study other dynamical effects related to
suspension systems using more realistic suspension model than the simple model
used now, including up-conversion of the seismic noise to those around various
high frequency resonances.
Simulation of 40m Interferometer
(Monica) The control feedback
on the mirror positions has been added to the e2e 40m package: Inverse matrix
has been implemented (conversion from degrees of freedom to mirror positions).
The diagonalization will start soon using both the matrix values obtained with
Finesse (to check if they can be used directly) and the values obtained with
e2e simulations. In the meanwhile I'm using Finesse to study some differences
in results of Twiddle and e2e.
Alfi
(Melody) Working on fixing
existing Problem Reports (PR). Worked on PR 449 (a cleanup utility to delete
ALFI backup files after a certain amount of time has passed). Also creating an
option in the ALFI Preferences page to clear all files in the backup directory.
Data Analysis Activities (Lazzarini)
Creighton:
I've been working on a validator validator for Einstein@home: a program that
will compare two versions of the Einstein@home validator to test whether they
give consistent validations.
Shawhan:
- Reviewed
the S2 Hough pulsar search results prior to the LSC Meeting.
- Attended
the LSC Meeting and gave three talks. Also attended the Burst Group face-to-face meeting.
- With
Vuk Mandic, did hardware injections.
In particular, added two simulated pulsars in binary systems for
the last ~day of the run.
- Catalogued
"extra" coincident events occurring during S4 injection sessions.
Sutton:
Since getting back in town I've been running TFClusters simulations using
Julien Sylvestre's old LDAS job scripts.
The new data will be used to answer the remaining questions about
efficiency for the LIGO-TAMA bursts paper review.
Yakushin:
- Attended
LSC meeting, burst f2f and grid workshop.
- Presented
the results of the S4 online analysis at ASIS.
LIGO Data Analysis System
Software Systems (Blackburn)
LDAS:
Worked on getting the warning messages out of the configuration scripts used
to build LDAS during the configuration phase.
Still unable to get the new GCC 3.4.3 to work with LDAS. Experimented with
the compiler CPU optimizations in an effort to speed up the createRDS
process on Solaris.
Enhanced the controlMonitorAPI client to include a new and improved (and
complete) list of user commands for selection.
Ran the LDAS system and integration tests on LDAS version 1.5.15. Added new dataStandalone
and putStandalone scripts for running on tandem-III and LDAS-DEV. This
was a bit tricky as these tests use much more disk space than their
complimentary dataPipeline test scripts. Clean-up steps had to be added
to support this.
Working on new system and integration scripts to encompass all LDAS user
commands.
TCLGLOBUS:
Finished Perl script to extract the result of each test case and publish it
on the TclGlobus project status website.
Updated Globus FTP client ROBODoc documentation.
Still working on Tcl test cases on how to transfer very large files using
different attributes (parallel or non-parallel) used to control the security
and performance of an FTP operation provided by Globus FTP client and control
packages.
Four out of 89 SWIG-wrapped Globus FTP Client functions are still buggy.
These functions are being used for testing.
- globus_ftp_client_operationattr_get_layout()
- globus_ftp_client_operationattr_get_tcp_buffer()
- globus_ftp_client_operationattr_get_dcau()
- globus_ftp_client_operationattr_parallelism()
OSG and GRID:
Updated the LIGO-CIT-OSG cluster to run the new OSG release 0.1.4. This is
still an integration testbed release.
With Naveen's departure, worked to hand off some of the expertise for installing,
configuring and running OSG to Michael.
Hardware Systems (Anderson)
Caltech
(Dan Kozak)
- Put
more error checks program that generates data for the LDR lag plots, this
has worked to keep the plots from going strange.
- Monitored
LDR status and transfer rates.
- Continued
end-to-end md5sum checks on L0 data.
Caught one file that wasn't transferring from LHO.
- Relabeled
the rest of the L0 copy 2 tapes at LHO.
- Deleted
the /archive/rds[12] trees at LHO, the data was redundant.
- Got
/archive/frames/sim going to tape at CIT.
- Received
the postS3 tape shippment from LHO, imported them into the CIT silo and
began the verification of md5sums.
(Phil Ehrens)
- Worked
with Stuart Anderson to get LDAS-TEST cluster back to 8 nodes.
- Studied
the Subversion version control system and worked out configuration and
installation issues.
(Stuart Anderson)
- Finished
bringing the LDAS-TEST cluster back up to 8 nodes.
- Care
and feeding of LDR during the last week of S4.
MIT
(Keith Bayer)
- Looked
into NFS write errors between Solaris 9 and FC3 on new pcraid box.
- Copied
profiles to ldas-pcdev1.
- Mounted
/opt/CERN and /opt/dmt on pretty much all the linux boxes.
Livingston
(Igor Yakushin)
- Talking
to SUN about extending our hardware contract. Almost ready to sign it.
- Helping
users at grid workshop to set up their accounts.
Hanford
(Ben Johnson)
- End
of S4, though data archiving and publishing will continue until the
morning of March 28. /frames publishing will continue beyond that time.
- Added
a retry+timeout feature to the publishing scripts when connecting to the
segment database.
- Some
pulsar jobs were causing a load of 70-90 on the cluster home directory NFS
server. The user modified her jobs, which allowed other users to be able
to operate normally.
- Rebooted
several nodes due to kernel panics on jbd. Another node froze due to bad
RAM. 6 more DIMMs have been ordered.
General Computing (Wallace)
MIT:
(Keith)
- Built
secondary outgoing mailserver w/ SMTP AUTH and TLS/SSL support to
troubleshoot Eudora SSL problems.
Still having trouble with Eudora at this point.
- Trying
to get rid of several pieces of equipment: Qualstar late model tape robot
HPLaserprinter 5m
- Looking
into LDAP authentication services
- Monitoring
Einstein@home mirror running at MIT
- Put
new SSH authentication wireless router in place in NW17 (since everyone is
at LSC it was a good time to do it...)
- Built
collab machine for postdoc(s) but am still testing it
Livingston:
(Shannon)
- repaired
the backup server. The power
outage took out the motherboard and the system drive on this server. A full backup now uses 13 AIT2 tapes
and >48 hours to run. The
user home directories are now using about 1/2 terabyte.
- Most
of this week was spent supporting the LSC meeting other than miscellaneous
items.
- Worked
on numerous support contract and licensing issues with Sun. Received an amended quote from
them for our servers here. We
dropped the E450 since it will be replaced soon.
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
- Installed
gnupg, Thunderbird and Firefox on my computer and the license server to
comply with a requirement for all sys admin to register secure keys and
use mail software that has an encryption plugin.
- Working
on building a centralized syslog server.
- Thanks
to Larry, a problem with the host name of the mail server showing up in
people's e-mail addresses is now fixed.
- Installed
a new wireless access point for testing. The Proxim AP 2000 access points have had problems with
dropping their signal on a regular basis. I've installed a Linksys AP to see if it will work
better.
- Other
misc. user support.
CIT:
(Mike)
- VPN
Server: Setting up user accounts, and testing security features on this
server. I ran many additional tests to insure that this service will not
affect the network.
- Modem
Pool: Larry and I ran multiple tests, making sure the 1-800 number is
hunting the way it's suppose to. It looks like the phone company has done
their part on correcting the hunt sequence. Now we are keeping a close watch
on the hardware to see how long the uptime is before we have to reboot
this unit. Rebooting the modem pool has been a weekly routine. Hopefully this problem has been
corrected.
- Loaded
another laptop that came back from travel. This included a reload of the
OS, and loading all GC software. I have put this back into the loaner
pool.
- Dave
Beckett: Loaded an updated workstation for him. This is a much faster computer,
and I will also be replacing his flickering Monitor.
- Dennis
Coyne: Larry and I relocated his Engineering workstation to the 2ed floor
on W/B 252. This is to allow multiple users to run simulations and other
Engineering tasks. Dennis
requested that I use Larry Jones old Dongle to run Solid Works on this
workstation. This required me to re-install Solid Works to recognize the
new Dongle. This workstation is up and running.
- Loaded
a Power Book G4 12" that is to be used for General Computing.
- Continuing
to work with Larry on the Spam Filters.
- Other
onsite/phone support that included networking, printing, software, and a
few hardware issues that I took care of this week.
(Veronica)
- LSC: Updates to the March meeting
website. Installed a webpage
for presentations and posted the talks. Almost all the talks were posted by the end of the
meeting. Updates to other LSC webpages.
- LIGO: Finished the last three online
submittal forms for the 40m website.
Installed a webpage for LIGO PhD Prize. Set up video recording for Calum Torrie, edited the
footage and captured it on a DVD.
Continued Norton AV upgrades to 9.0 and security checks on Windows
machines. Updated the roster
database.
(Larry)
- Resolved
a number of contract issues. SUN is using a third party for their maintenance
contracts, which is causing some confusion as things get transferred over
to them. Finally, after a couple of months the company has put in the charges
for one of the maintenance contracts. A renewal contract is being generated
for the backup s/w being used.
Finalized the renewal of the maintenance contract with Foundry for
the local networking equipment.
Resolved a few issues with the P-card people and still have a few
more paperwork items to deal with.
- Repaired
one of the E2E servers. It is still having a timing issue. There are still
a few more things to try before doing a rebuild.
- Spent
time working on the modem pool. With Mike's assistance and constant telephone
calls to SBC the problem appears to be resolved. SBC had to physically
- reset some equipment to get the hunting feature to
work correctly.
- The
IDEAS licensing issue has finally been resolved. Campus is taking care of the
licensing (we do have to pay for the licenses) and is working on getting
the media out to us. The codes needed have been sent and we should be receiving
our new network license in the near future. However, we can't install it until
we receive the media.
- Assisted
Mike in moving some equipment around and getting a couple of s/w pkgs. installed
for different people.
- Did
some minor trouble shooting on the web server and network connection. The performance
for web access should be back to normal now.
- Started
setting up a new quad CPU sandbox. Barring any problems is should be on-line
by the end of next week.
- Worked
a number of e-mail issues. Including checking out the spam filters and tracking
down problems for different people.
Mail Statistics March 17-23, 05:
Accepted Messages 17,244
Virus 340
False Positives 452
Reject Messages 13,379
Total Messages 30,623
Advanced LIGO and Supporting R&D (Shoemaker)
Systems and Management
No report this week.
Seismic Isolation
From: Ken Mason kmason@ligo.mit.edu
Advanced LIGO Seismic Structure
SEI Structure:
We recieved the final DVD from ASI and began separating drawings into
several bid packages. We are awaiting a decision from the SEI BSC Critical
Review Committee on proceeding.
Recieved MSC Nastran with Ideas translator. I opened all the finite element
analysis files with no problems.
Actuators:
PSI has rejectected (3) large and (1) small actuator during testing for
breaks in the field windings. The breaks are near the contact area and
shouldn't be difficult to repair. The rejected actuators have been
returned to their winding facility in Mississippi
for repair.
(1) large and (1) small actuator has been shipped to Jay Heefner at
Caltech.
Suspension
From: Janeen Romie romie_j@ligo.caltech.edu
From: Ken mailand <kmailand@ligo.caltech.edu>
Lower suspension installation fixture arm, attaching to the flange of the
BSC chamber. I’m doing a detailed
design of the arms, minus the interface with the suspension frame. I will get with Russell when the
framework closer to final design.
The Algor stress analysis indicates no problem stresses or deflection issues
on the preliminary design.
I have selected a common tapered roller bearing for all the pivot shafts.
One of the module shelf brackets for the BSC chamber has been completed.
Further work on the attachment of the chassis box will be done when the chassis
box component part has been selected by Todd.
Core Optics
From: Helena Armandula <ahelena@ligo.caltech.edu>
Advanced LIGO Coatings - Cleaning
In order to develop a cleaning procedure for coated Adv. LIGO optics, I
tested different cleaning methods on coated samples and observed their effect
on coating absorption.
The absorption measurements were performed at Stanford. Will have a report for next week.
Pre-Stabilized Laser
From: Peter King pking@ligo.caltech.edu
I have been preparing some viewgraph materials for the PSL conceptual design
review. This included taking a look at the ANSI laser safety requirements
--- which is timely considering an article in this month's edition of Photonics
Spectra concerns laser safety. I will be asking the campus safety office
for advice about the calculation concerning the laser safety eyewear optical
density, as the value suggested by the standard seems too low to me.
The high power photodetector is still going on. A new board revision
of this design was ordered. The new revision fixes a relatively minor
problem with the board layout.
Auxiliary Optics
From: Michael Smith smith@ligo.caltech.edu
OPTICAL LEVER
I have modeled and optimized several candidate optical receiver lens systems
using ZEMAX. I am in the process of learning how to use the ZEMAX tolerancing
program and the multiconfiguration editor to model a real lens assembly and to
model an alignment procedure for the assembled lens. These models will be a
basis for the SURF project this summer to develop and characterize an optical
lever receiver lens for ADV LIGO.
A SURF student has accepted to work on the optical lever receiver for
ADVLIGO project.
BRDF MEASUREMENT
A SURF student has accepted to work on the BRDF project for ADVLIGO.
Other Laboratory R&D
For additional information about this report, contact Stan Whitcomb or Phil Lindquist