Weekly Report for Week Ending March 30, 2006

Due to travel by some of the principals, no LIGO Executive Committee meeting has been scheduled for Monday, April 3, 2006.

Special Announcements:

Weekly Report Highlights

LSC Issues (Saulson)

The LIGO/TAMA S2 Inspiral paper was accepted by Physical Review D this week, and the S3 Burst paper was published in the Amaldi meeting proceedings in CQG.

The final version of the new LSC Bylaws, as approved at last week's LSC Council meeting and edited to remove typos, has now been submitted to the DCC.

Work continues of revision of the draft LIGO/Virgo MOU, in light of comments made at the LSC Council meeting..

LIGO Laboratory Administration (Lindquist)

STATUS OF LSC MOUs (Lloyd)

LSC MOUs and Research Plans and Progress Reports

  • No report this week.

SITE TELECONFERENCE (Lindquist)

A site teleconference was conducted Thursday, March 30, 2006.  The following were among the issues discussed:

  • Livingston Science Education Center—Not totally closed up yet; still missing some glass, doors, etc.  However, the weather has been very cooperative so they are doing very well relative to the schedule.
  • Livingston Access Gate—the gate is up and running.
  • There are no open assigned actions.  The list of assigned actions updated through December 1, 2005 (the last time that it was updated) will be found Here.

PROPERTY MANAGEMENT (Luna)

>From: Rod Luna <rluna@ligo.caltech.edu>

  • Provided assistance to the Detector Group  (H. Armandula) with packing and shipping a coated mirror to Stanford (R. Route), Account Number LIGO.OPT - 5.4 - NSFLIGO.FY02ON.
  • Coordinated the disposal of old monitors and printers. Account Number LIGO.DAT-1.5.3-NSFLIGO.FY2ON.
  • Assisted Bill Tyler in disposing a Glove Box.
  • Tagged two File Servers for Larry Wallace.

DOCUMENT CONTROL CENTER (Turner, Mak)

>From: Linda Turner - turner@ligo.caltech.edu>

  • Supported the LSC preparing and processing over 135 presentations.
  • Presented an overview of the new document management system to the LSC.
  • Met with Sam Finn to discuss integration of his new LSC E-mail system into the new Synergy software for the DCC.
  • Met with Dennis, Calum, Todd, and Rich to define the workflow process needed by the Engineering group generally, and the Electronic engineering specifically for the Synergy software.  This began to help flesh out the metadata needed and determine which information would be collected within the workflow versus in a regular document upload.

>From: Cleveland Mak mak_c@ligo.caltech.edu

  • No report (Personal Leave involving new small person that kinda looks like Cleveland).

COST SCHEDULE CONTROL SYSTEMS (Cunningham, Brambila, Kaufman)

>From: "Cronin, Holly" <Holly.Cronin@caltech.edu>

>From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>

  • Completed change order #171 to Triad and issued the change to the vendor.
  • Completed the renewal of two computer maintenance orders for LLO and for LHO from Sun Microsystems to go into effect 4/1/06.
  • Working on the purchase for the fan with the arm for the LIGO Hanford Observatory.
  • Issued the subcontract to High Precision Devices and federal expressed it to the vendor.
  • Working on revising the terms and conditions for the University of Florida to the original TCs.
  • Waiting for a response from University of Pisa to proceed with the payment for the fellowship.

>From: Florence Kaufman <fkaufman>

SUBCONTRACTS MANAGEMENT (Jasnow, Salone)

>From: Gina Salone <gsalone@ligo.caltech.edu>

  • Nothing significant to report.

>From: Ed Jasnow <jasnow@ligo.caltech.edu>

  • Construction of the LLO SEC continues slightly ahead of schedule due to continued good weather.  The glass front remains the only part of the building not enclosed.
  • The Galli & Morelli contract for the HAM-SAS for Advanced LIGO has been reviewed by the NSF, and their only requirement was the addition of some flowdown clauses.  Those clauses have been added, and the revised contract sent back to the NSF electronically.  Upon receipt of their approval, the contract will be awarded to Galli & Morelli.

SUPPORT (Baldon, Hiroto, Lloyd)

>Irene Baldon

Worked on the usual new trips, expense reports, reconciling, calendar reservations, and itinerary entries.

>Julie Hiroto

No report (Vacation).

>Dorothy Lloyd

  • Processed the usual requisitions for POs and payment request, and approved and submitted the weekly incoming invoices to accounts payable for payment.
  • Updated contract invoice log and reconciled petty cash fund.
  • Jim continued with data entry in the LIGO database and helping out in the DCC.

PROPOSALS and REPORTS (Lindquist)

NSF has advised us that they are ready to fund us for the last half year of LIGO OPS pending receipt of a budget.

CHANGE CONTROL/CONTINGENCY MANAGEMENT (Lindquist)

  • No open change requests.

HUMAN RESOURCES (Akutagawa)

>From: Cindy Akutagawa <cindy@ligo.caltech.edu>

  • The minutes and action items from the March Staffing Committee meeting have been posted on the SC web page.
  • All files for the Staffing Committee are up-to-date and posted on the SC web page.
  • Prepared numerous appointment and reappointment memos for various Visitors, Post Docs, and Term Staff.

Quality/Safety (Tyler)

>From: Bill Tyler tyler@ligo.caltech.edu

Nothing significant to report this week.

LIGO Hanford Observatory (LHO) and Interferometer Operations (Raab)

Summary of Commissioning Activities at LIGO Hanford Observatory (compiled by M. Landry)

For the second week in a row, both LHO detectors have achieved S5 target duty cycles at decent binary inspiral range (H1 90% at ~14Mpc, H2 87% at ~7Mpc).  This was achieved despite downtime on Saturday on H2 due to alignment and ISS trouble after a magnitude 5.0 quake off the coast of Northern California .  It thus seems that the additional fan (started Wed 15th) has stabilized temperatures sufficiently for reasonably rapid relocking.

An issue actively being tracked is an apparent occasional corruption of 1/16th of a second of FB1 data, perhaps not seen in FB0.

This week's range and duty cycle update can be found here.

LIGO Livingston Observatory (LLO) and Interferometer Operations (Zucker)

L1 Interferometer in S5 (O'Reilly)

We had a very good week of data taking with a duty factor slightly above 70 percent.  Weather, local activity (including construction), and diligence all contributed to the improved performance.

The major activity of the week was the completion of the LDAS move. This was accomplished and all data from the backup framebuilder fb0 was successfully archived.

Maintenance period on Tuesday was relatively uneventful. The major change was to acquire the 100 kHz fast channel. This brings us into line with LHO configuration and does increase the frame size. As a consequence fb1 now has reduced look back of ~6 days.

A strong 128 Hz line has been seen in the data. This should be investigated during our commissioning break.

On Monday April 3rd LLO will start a two-week commissioning break. The last weekend of the break will be used to assess the stability of any changes and to perform any needed characterizations including calibration.

LLO Outreach (Thacker)

Two visits to local High School (five 9th grade physical science classes); prepared and executed lesson two middle school visits to LLO; prepared and executed two "half-day" programs assisted in data collection effort with Lisa Szechter prepared for Washington Parish, Math/Science Partnership Workshop at LLO

AdL Suspensions and Isolation (Romie)

Held a fruitful Suspensions Workshop after the LSC meeting last week at LHO. Notes from the workshop should be available next week. Actions from it will be statused at the SUS weekly telecon.

After the workshop, I've been primarily working on NSF Review material.

General Computing (Giardina)

I've been mostly consumed by LDAS for the past two weeks.

  • continued software installs on Janeen's new PC.  Requested Algor license from Larry Wallace and Mike Pedrazza
  • other usual user requests and support

LDAS Support (Giardina)

  • LDAS move to new location
  • ejected tapes for shipment to CIT and imported tapes into L700
  • L700 problems recognizing tape drives and tapes were getting hung up.  This appears to have cleared after several reboots and some manual intervention by both myself and Igor.
  • Fiber connection between CDS and LDAS was damaged during move.  A temporary fiber was pulled and a connection was established, then we had the original fibers repaired.
  • worked with Lisa to reduce on-disk look-back of full frames on fb1 /frames filesystem.  After new fast channel was added, we were dangerously close to running out of space.  Reducing from 7 days to 6 days leaves us with 10% free in anticipation of acquiring additional channels.
  • node99 is still having problems.  I will resume looking at that this afternoon.
  • Replaced two T3 failed disks.

Computing and Network Security (Roddy)

  • Did some work straightening out the lab the other day.  I will soon need a test environment again.  Still lots of old stuff that needs to be tossed, straightened or moved in there.  mounted a couple of machines in the rack.
  • Set up a Linux box for Lisa & DMT folks.  They need a dedicated box for running a specific monitor.
  • adjusted the backup schedules.
  • Made some adjustments to the router to accommodate the ilog move.  Ended up causing a problem with routing LSU IP addresses.  Took a couple hours to figure out what the problem was.  Turned out to be a subnet problem on a virtual interface.

CDS (Bogue)

  • Moved all DMT data from the old ldas sam-fs t3 to the 3511 attached to the backup framebuilder
  • Moved all of /cvs/cds to a disk array with more available disk space.
  • Worked with Shannon to move the ilog server out of GC and into CDS.
  • Reconfigured the daq on the backup framebuilder to increase the lookback (we have more disk space now).
  • Reconfigured the daq on the primary framebuilder to decrease the lookback.  The disk was full due to acquisition of L1:LSC-AS_Q_FAST.  Thanks to Dwayne for all of his hardwork in addressing our disk space issues.
  • Supported the ldas move.
  • Installed a new boot disk on poplar.  Worked with John Z. to get it properly configured.
  • Added DMT /export/home to the weekly cds backup.

CDS Code (Khan)

Setting up an alternate development system based on Linux operating system; for testing and developing CDS related software bugs

Data analysis (Yakushin)

Storage/Condor/LDAS Admin

  • LDAS move was successfully finished with all the services been restored on Friday. The new LDAS room is still under construction though: the installation of walls is not finished yet.
  • u1d7@t3-6 and u1d8@t3-20 failed and were replaced by spares. The replacement disks were ordered from SUN.
  • Disk 10 failed in 3510 and was replaced.
  • Two fibers running between LDAS FC switch and the GC patch panel were damaged during the move and fixed on Friday.
  • Ordered a barcode scanner for the tapes.
  • /archive file system developed a problem on Monday: the speed of writing to it dramatically dropped, the speed of reading from it was not affected. We are temporary archiving frames to /home and expect to fix the problem with /archive during LLO commisioning period next week.
  • On Saturday tape robot stopped working. It turned out that there was a tape stuck half way in the robot's arm and half way on the shelf. Moving this tape manually to a shelf fixed the problem. According to the SUN engineer, it was most likely due to the fact that the robot had not yet calibrated itself after the move.

Data Analysis

  • Gave a presentation at LSC meeting on the results of the burst search during the first few months of S5.
  • Continue testing and tuning the coherent waveburst version on S4 data.

Initial LIGO Detector Science & Engineering (Coyne)

No report.

40 Meter Interferometer (Weinstein)

IFO Commissioning

  • Go and Osamu are measuring the noise spectrum of FPMI at high frequency (~1 MHz). The demod board was very noisy, so they switched to another mixer. The noise is at a level of ~1e-11 m/rtHz, compared with shot noise expectation of 1e-15 m/rtHz. This appears to be due to the photodetector electronics. Osamu will follow up. Meanwhile, they will try to measure the noise in a DC readout scheme suggested by Rob.
  • Monica and Dan continue to develop the noise budget software for the 40m environment. They have measured the oplev couplings and transfer functions with the FPMI locked, and can plot the oplev noise budget traces. They are now working on the MC WFS contributions. They are modifying the XML templates for many, many channels. They will soon take a calibrated noise spectrum in the FPMI configuration.
  • Last week the MC was very unstable. Osamu found the MCR beam was clipped at the beam tube newly installed by Steve. The WFS signals had big offsets that could not be zeroed electronically. There might still be some clipping of the beam, or the WFS itself might have been damaged. Dan will follow up on the potentially damaged WFS photodiodes.

IFO Modeling

  • Monica continues to develop her e2e simulation of the POX and POY loops, reducing the offset that appears in the full DRFPMI configuration. She is now starting an AdIRGO model in e2e.
  • Rob announces the first release of Optickle, a new matlab-based frequency-domain IFO simulation tool that includes quantum noise, radiation pressure, DC and RF readout, simple user interface, and lots of example configuration files. It can calculate TFs from any point to any other point in the simulation. He already has used it to note that the near-zero terms in the length control matrix from DARM to any double-demod short-DOF port get significantly larger when the radiation-pressure-induced optical spring is included. He is now handing the code off to Osamu to study the quantum shot noise in all the control loops, for AdLIGO. See Rob to obtain the code.

DC Detection and Vacuum Squeezing Development

  • Sam and Rob mounted the mirrors on the OMC body, and mounted the curved mirror on the PZT with a few dabs of epoxy. They then tried to see FP resonances with a small crystal laser, but the laser power was drifting, and there was mode hopping. So instead they directed some of the main laser beam from the IFO reflected port beam (which was already on the table, ~10 mW) into the OMC. They see nice FP flashes. They tried locking the cavity with the PZT-actuated mirror, using offset locking. However, the curved mirror was shaking too much (the epoxy was not yet fully cured), and the amplifier was insufficient. They then tried dither locking, but had similar problems. So now they are waiting to fully cure the glue joints securing the PZT to the bracket and the bracket onto the OMC body; waiting 24-72 hours.
  • Rob will set up the output MMT next, aligning it with a HeNe laser. Sam will set up the steering PZT mirrors and test to see if the mounts are sufficiently rigid.
  • The driver electronics for the tip-tilt PZT steering mirrors are still under design. Sam is deriving noise requirements, and Jay is designing a board with 2*2 PZT drivers, incorporating read-back of the tip-tilt strain gauges and a fast "shutter" level.
  • Jay has finished a detailed control electronics schematic for the DC readout, based on digital controls with a PCIX-based system.
  • The DC readout control software will be developed in "Bork-space", a new suite of power tools by Rolf to design the controls in simulink and then have it automatically generate the front-end code, EPICS screens and databases, etc. This will be fun!
  • Ben is almost finished laying out the PCB for the DCPD Interface board. He has met with Jay to make sure that the board is the correct design to fit with Jay's system schematics.
  • Jay says that we can use oplev PDs and interface boards instead of QPDs for monitoring the DC readout beams; they will be less noisy.
  • Steve, Osamu and Go installed a pickoff beam path on the PSL table to direct ~ 2.7 W of laser light (which was being dumped) onto Go's squeezer setup. They also shifted the MCT beamline (which was on the NW corner of the PSL table) over to make more room, and removed the Tropel. go installed the SHG optics, assembled the SHG cavity in its oven with a curved output coupling mirror. He also drew up version 2 of the squeezer layout. Parts for the SHG enclosure (for safety and acoustic noise) are being machined at the Caltech machine shop.

Electronics, Controls, Computers

  • Dan and Ben did a comprehensive survey of the fast DAQ channels. from the PSL/IO DAQ interface board. Ben is assembling a list of which interface board channels go to what signal names on the dataviewer screen. This list has slightly changed from the last time that he did this survey. He also compiled a list of the signal conditioning on the two Generic DAQ Interface boards. He will write up a table showing each channel's electronics from beginning to end.
  • Dan worked with Ben to debug the AP 166 demod board, studying how the LO levels affect the noise.

Lab Infrastructure

  • Steve measured the tranmission of IR light through our new laser safety glasses: Laservision's white frame "LC542" only for 1064nm OD 5+, and Bacou-Dalloz's blues-gray frame "31-20200" for 532 & 1064nm OD 5+. These have dielectric coating and they reflect the laser beam. He checked this at different incident values with 2.5W ~2mm beam diameter.

Thermal Noise Interferometer (Black)

We are still debugging our increased noise floor in SAC after installing ring dampers. The extra noise does seem to be coming from the south arm cavity itself, as opposed to the control electronics or the photodetector, and it scales with the power in a way consistent with it being an actual length noise.

LASTI (Ottaway)

No report.

Data Analysis and Computing (Lazzarini)

Simulation and Modeling (Yamamoto)

QuadFP (Hiro Yamamoto)

Hiro worked on implementing ASC in QuadFP setup so that ASC and angular instability can be studied.

40m modeling (Monica Varvella)

The offsets in the POX and POY error signals have been reduced tuning the right demodulation phase.  The CARM open loop transfer function has been simulated.

SUS & SEI for Adv.LIGO (Mark Barton, Sany Yoshida)

Sany studied the effect of the SEI - active and passive - to the table top motion.  Mark has calculated a transfer function from the longitudinal motion of the suspension point to the yaw motion of the test mass.  This is part of the understanding of the yaw noise motion to be properly implemented in the simulation to test the angular instability.

Modeler Coding (Burce Sears, Hiro Yamamoto)

Hiro worked on further improvements of FUNC_X input format.  Now using two templates, UNC_X_SettingTemplate.cc and FUNC_X_SettingTemplate.h, all code fragments for FUNC_X can be defined in a natural C++ environment.

Bruce worked on the input of modeler.  More reorganization of parser code and introduction of a new modeler directive in box files to inform the modeler when all modeler data has been read in (the modeler does not need to continue reading through the file if the rest of the file only pertains to information for the Alfi graphical editor.)

Static IFO Simulation (Hiro Yamamoto, Melody Araya)

Melody worked on setting up scripts for the maintenance and distribution of the SIS package.  Hiro worked on the fundamental coding of SIS.

Data Analysis Activities (Lazzarini)

Brown:

  • Found a strange glitch in the H2 excitation channels with the online inspiral code.  Informed Shourov and the glitch group and they've been pursuing the cause.
  • Looked at issues involved in implementation of the physical template family with Diego.
  • Finished a chapter for a book on e-science workflows describing the tools available to construct inspiral pipelines.
  • Fixed segment database replication from LLO to CIT, all segment database services are now fully operational.
  • Wrote some slides describing said database in preparation for hand off of the maintenance to Igor.

Chatterji:

  • Investigated occasional 1/16th of a second data repeats in the data recorded by te fb1 framebuilder (password required).  http://ldas-jobs.ligo.caltech.edu/~shourov/corruption/
  • Updated Q Pipeline trigger lists and coincidence results for LIGO/Virgo study.
  • Investigating parameter estimation for the Q Scan utility.

Mendell:

The current focus is on updating S4 StackSlide results presented at the LSC meeting for review next week, and presentation at the APS meeting.

Shawhan:

  • Studied efficiency curve fits and uncertainties for S4 all-sky burst search.
  • Prepared a talk presenting an overview of gravitational wave signals and data analysis methods.

Sutton

This week my co-authors and I finished our paper on coherent consistency tests for GWBs.  I sent the paper to Saulson and it has been posted for LSC review.  Since then I have been editing/debugging NetworkSimulator codes with Maria Principe for simulating bursts searches.

Yakushin

1) Gave a presentation at LSC meeting on the results of the burst search during the first few months of S5.

2) Continue testing and tuning the coherent waveburst version on S4 data.

LIGO Data Analysis System

Software Systems (Blackburn)

LDAS

Work has resumed on the two problematic compression mode DIFF_ZERO_SUPPRESS_SHORT and ZERO_SUPPRESS_INT_FLOAT (PR#1828).  Initial tests have been encouraging as the unit tests that originally demonstrated a problem now produce correct results.  Much validation of this code remains to be done.

FFTW 3.1.1 has been installed on ldas-dev for validation with LDAS (PR#3005). When upgrading FrameL to v6r20 (PR#3008), no shared object was generated. Benoit Mours is looking into the issue.

Testing of LDAS was done using version 1.8.130 of the software.

TCLGLOBUS

Version 0.5.0 of TCL Globus was officially released. This included source distribution and RPMs for the LSC software group. The release notes can be found at http://tclglobus.ligo.caltech.edu/ release_0_5_0.html

The unit tests for the Globus GRAM Client have been completed and most of the documentation for this API has been done.

A list of tasks for the 0.6.0 release is available at http://tclglobus.ligo.caltech.edu/cgi-bin/tclglobus_critical.cgi.

Work continues on why the TCL file event does not get triggered when incoming data is sent in rapid succession.

GRID COMPUTING

Reinstalled Condor 6.7.13 on submit host and tested against Condor 6.7.17 on test bed cluster. Determined that DAGMan (client side component) of Condor 6.7.17 is unreliable. Reported bug.

Successfully ran Inspiral pipe work flow to completion on seven additional OSG 0.3.6 sites as part of the OSG 0.3.6 validation effort:  CMS_BURT_ITB, LIGO-CIT_ITB, Purdue_ITB, IUPUI_ITB, CIT_ITB_2, BNL_ITB_Test1, and UFlorida_IGT.

Attended a bi-weekly STORAGE-TG telecom on metadata mods to support SRM.  Attended a VDS telecom to advocate for modifications to vds-get-sites required for compatibility with OSG ITB GridCat.

Determined that under OSG 0.3.6 at Purdue_ITB with maxjobs = 200, the Inspiral pipeline can execute in 19 minutes versus 52 minutes with maxjobs = 20, given a workload of 943 DAG nodes. Transfer time to this site is 37.5 minutes for 5.1GB.

Held a teleconference with the developers of Pegasus to discuss improvements that would facilitate running the binary inspiral workflow on the OSG.

Hardware Systems (Anderson)

Caltech

(Stuart Anderson)

  • Received and integrated 77 more Opteron nodes into LDAS-CIT with help from Phil, Erik, Patrick, and Shourov.
  • Upgraded Condor from 6.7.16 to 6.7.18 to fix a major security hole.
  • Working on individual SAM-QFS filesystem slowdown at LHO and LLO.
  • Met with Sun Microsystems for a look at their short and long term product plans.
  • Relocated the LDAS-CIT servers to the other side of the computer room.

(Espinoza)

  • Deployed 77 new nodes
  • Rebuilt ldas-kickstart
  • Shipped RMA package to ASA Computer
  • Worked with Phil on ldas-kickstart for possible hack
  • Configured cabinet power distribution units & liebert pdu's
  • Worked on kickstart for other sites

MIT

(Keith Bayer)

  • Brought ldas-gridmon back online.
  • Brought datacon back online.
  • Sent property stickers and serial numbers for 70 old cluster nodes to Caltech.
  • Contacted shipping company for cost estimate w/r/t 70 nodes and racks - will get a site review and estimate.

Livingston

(Igor Yakushin)

  • LDAS move was successfully finished with all the services been restored on Friday. The new LDAS room is still under construction though: the installation of walls is not finished yet.
  • u1d7@t3-6 and u1d8@t3-20 failed and were replaced by spares. The replacement disks were ordered from SUN.
  • Disk 10 failed in 3510 and was replaced.
  • Two fibers running between LDAS FC switch and the GC patch panel were damaged during the move and fixed on Friday.
  • Ordered a barcode scanner for the tapes.
  • /archive file system developed a problem on Monday: the speed of writing to it dramatically dropped, the speed of reading from it was not affected.  We are temporary archiving frames to /home and expect to fix the problem with /archive during LLO commissioning period next week.
  • On Saturday tape robot stopped working. It turned out that there was a tape stuck half way in the robot's arm and half way on the shelf.  Moving this tape manually to a shelf fixed the problem. According to the SUN engineer, it was most likely due to the fact that the robot had not yet calibrated itself after the move.

(Dwayne Giardina)

  • LDAS move to new location.
  • Ejected tapes for shipment to CIT and imported tapes into L700.
  • L700 problems recognizing tape drives and tapes were getting hung up.  This appears to have cleared after several reboots and some manual intervention by both myself and Igor.
  • Fiber connection between CDS and LDAS was damaged during move.  A temporary fiber was pulled and a connection was established, then we had the original fibers repaired.
  • Worked with Lisa to reduce on-disk look-back of full frames on fb1 /frames filesystem.  After new fast channel was added, we were dangerously close to running out of space.  Reducing from 7 days to 6 days leaves us with 10% free in anticipation of acquiring additional channels.
  • node99 is still having problems.  I will resume looking at that this afternoon.
  • Replaced two T3 failed disks.

Hanford

(Greg Mendell)

  • We are working to understand and resolve a number of issues with the archive and cluster home directory filesystems at LHO and LLO.  The essential functions of data archiving, RDS generation, and data publishing are working, though until these issues get sorted out some services will run more slowly than normal, such as jobs running on the clusters.

(Ben Johnson)

  • Disk2Disk troubles at both sites. At LLO due to slow /archive writes, and at LHO due to /ldas_outgoing NFS troubles.
  • Assisting Dave Barker with 16th-second sample repeat problem on fb1.
  • Gave Solaris 10 overview to LHO sysadmins. 
  • Gateway is occasionally failing to export /export to GC and LDAS.  Don't know the cause yet.
  • High load on dataserver due to nfsd (has gone up > 210). Cluster job types have not changed except for Vladimir's powerflux jobs. The large number of files created/recreated/possibly destroyed could be clogging up sam-fs /home.
  • Educated user not to request 16kHz data 40,000 seconds at a time.

General Computing (Wallace)

MIT:

(Keith)

  • Begun working on remote backup service,  spec'd out hardware for backup server
  • Burn testing new hard drives for gc fileserver
  • Setting up new Linux and Sun machines with  ipf firewalls syslog reporting aide (tripwire) scripts ldap authentication and home dir access
  • Moved lancelot and enoki from optics lab to pump room
  • Reloaded firmware into Arena Industrial II raid array
  • Installed new Linux box into DMT network
  • Working to get home directories setup correctly
  • Moved pc into high bay to support Ken/Myron installation work.

Livingston:

(Dwayne)

I've been mostly consumed by LDAS for the past two weeks.

  • continued software installs on Janeen's new PC.  Requested Algor license from Larry Wallace and Mike Pedrazza
  • other usual user requests and support

(Shannon)

  • Did some work straightening out the lab the other day.  I will soon need a test environment again.  Still lots of old stuff that needs to be tossed, straightened or moved in there.  mounted a couple of machines in the rack.
  • Set up a Linux box for Lisa & DMT folks.  They need a dedicated box for running a specific monitor.
  • Adjusted the backup schedules.
  • Made some adjustments to the router to accommodate the ilog move.  Ended up causing a problem with routing LSU IP addresses.  Took a couple hours to figure out what the problem was.  Turned out to be a subnet problem on a virtual interface.

Hanford:

(Christine)

  • Took a couple of days off to recover from the LSC meeting.  The rest of the week has been spent responding to proposed changes as a result of the incidents at the LSC meeting.
  • Set up a password protected web page for a user.  Helped a user with some email problems.
  • Started putting together a new budget reflecting the changes in WAN connection charges which started last FY.

CIT:

(Mike)

  • Troubleshot DSPACE workstation for Mark Barton, due to a hardware failure. This was a power failure to the motherboard after user tried installing additional hardware. After reseating all hardware and power connectors, I was able get this workstation up and running again. I also installed additional memory to accommodate new hardware.
  • Look into borrowing a license from our FLEXLM server for Janeen Romie to run Algor in LLO. I can only borrow for a license for 30 days at a time. The only way around this in order for Janeen to use our FLEXLM server to run Algor is to set her up a VPN connection which will put Janeen back on the CIT network.
  • Continued work on loading two new servers with Server 2003, to replace our SQL, and LLPDMWORKS servers.  I came across many issues with this due to these servers were burned in using LINUX. When it came to installing server 2003 I came across many issues that required updating the BIOS and downloading updated drivers for hardware to work with 2003 server. I also had to call ASA regarding a BIOS setting that was preventing me from seeing the primary hard disk. I am in the process of loading and configuring SQL server to run with the new DCC database application SYNERGY.
  • Daily work on spam filters searching for false positives.
  • Other misc. tasks and user support.

(Christian)

  • Created a backup of Irene Baldon, Cindy Akutagawa, Phil Lindquist and Rod Luna's workstations.
  • Gina Salone - Upgraded Gina's system from Windows 2000 to Windows XP.
  • Basement E/B - Replaced toner cartridge on HP 4600 printer.
  • Patrick Sutton - Helped Patrick install 6th floor Millikan network printer to his laptop.
  • Working on finding a particular backup software that can work with different operating systems. So far, Altiris and Retrospect are looking pretty good. 
  • Other misc.: Continued onsite software/phone support.

(Veronica)

  • LSC:  Posted the bulk of the March meeting talks (something close to a 100).  A request has been made to restrict access to the listing of the closed-sessions talks (vs to the actual files), this still needs to be finished.  Updates to the technical papers database.
  • LIGO:  Installed the website for the Elba meeting, ongoing updates.  The backend database got corrupted and attempts to compress/repair it did not work, so I had to install a new database and import the data.  It took some server-level troubleshooting to rule out other causes.  Updates to the LIGO website.  Taped 2 special LIGO seminars and burned them to DVDs for Kip Thorne.
  • CaJAGWR:  Website updates.

(Larry)

  • Continual work on procurements. Mostly misc. support items.  Working on Foundry maint. contract. Time to get everything on it lined up.  SUN was able to answer some questions concerning the matching grant program and the paperwork for that purchase has now started.  Resolved a couple of Dell billing issues.  Working on list of items to purchase for conference support.
  • Went over items and support that GC will supply for future conferences.  There have been a number of meetings concerning this subject but I believe most of the concerns have been worked out.
  • Assisted Mike in a couple of h/w setup for the new DCC and PDMworks server installations.  Discovered the UPS can't handle the additional power load of the machines, we are now in the process of getting another UPS purchased.  The new machines also put out a lot more heat than some of the other equivalent boxes.
  • Working on monthly backups and trying to repair a problem with the backups on one of the servers.
  • Spent time working with the DCC and getting files moved over for web access.
  • Assisted Veronica on a couple of WEB issues concerning DCC and ELBA.
  • Worked a number of documentation items. The most important one working with a group on changes being made to the GC computer use policy.
  • Assisted Barry in resolving some of his telecommuting issues.  Hopefully, everything is working OK, we will know more when he returns from his trip.
  • Continue working the e-mail battle. Presently, trying to track down a problem on one of the servers. It has a process that hangs on a regular basis (once a day) causing problems for people trying to send out messages.

Mail Statistics for March 23-29, 06

Mail Statistics

March 30, 2006

Rejected Messages

34,093

Virus Messages

1,829

Accepted Messages

17,881

Total Messages

51,974

 

Advanced LIGO and Supporting R&D (Shoemaker)

Advanced LIGO Systems, Management

Systems

from Dennis Coyne

See also:

AL Systems web page

AL Systems email archives

Records of Decision or Agreement (RODA)

See also the RODA status web page

  • Nothing new

Requirements/Design

  • Presented the status of the optical & mechanical layout status at the LSC meeting. See G060098-01.
  • Calculated the atmospheric pressure load induced deflections for the proposed vacuum separation plate used to isolate the ISC Tables for read-out from the main vacuum system. (i.e. between the output tube and HAM6 and between HAM1 and the relocated HAM2 chamber). Discussed the implications with John Worden and Kyle Ryan. The deflections appear to be significant enough that further finite element calculations are warranted.

Interface Issues

See the "Interfaces" section of the AL Systems web page

  • At the SUS Workshop following the LSC meeting at LHO, Justin Greenhalgh led discussions with the SUS group on actions to resolve definition or provide clarification for the Interface Control Documents (ICDs) between SUS and other subsystems.

Vacuum Compatibility

Residual Gas Assay (RGA)

See also the Vacuum Bake Lab

  • I have been working with Ken Mailand on the Quad Adjusrer Platform this week. We have disassembled it and had the large plates plated to prevent rusting. I have cleaned all the parts and Ken began reassembling it yesterday in the clean room at the Synchrotron.
  • I have finished the bake job on the Faraday Isolator. It failed the RGA test. The unit was assembled before cleaning. I will ship the Faraday Isolator today (to Ken Franzen at LLO for performance measurement).
  • Cleaned some tooling for quad suspensions (Calum) on Friday of last week.
  • I stripped and re-cleaned some magnets for Helena.
  • I participated in the discussion of the quad controls prototype OSEM failures (part of the SUS Workshop held at LHO following the LSC meeting).

High-Irradiance, Contamination-Exposure Cavities

Lee Cardenas, Liyuan Zhang

Nothing significant

Advanced LIGO Project Management

from Carol Wilkinson

Preparations for the NSF Review of Advanced LIGO

Preparations for the NSF Review of Advanced LIGO, scheduled for May 31, are progressing. We are slightly behind schedule but can finish in time with some concentrated effort. Subsystem leaders with assignments to complete should make this effort a high priority in order to meet the deadlines.

Cost revisions are nearly complete and will be frozen on April 5. Adjustments to the baseline costs may continue after that date as decisions are made to eliminate or reduce scope, but the baseline will be set by April 20.

The Risk Management Plan has been drafted and the first simulations for the cost and schedule contingency analysis will be run during the first week of April. The risk plan includes a risk registry of potential events and mitigation efforts that will be tracked throughout the project lifecycle.

The Project Organization Chart has undergone some revisions. Lead roles and responsibilities are being refined. Work has started on identifying and assigning personnel to work on production and installation for the various subsystems. These personnel include those who currently have operations roles and have not been working on advanced LIGO. A transition plan to move personnel from operations to the project and back is in the early stages of planning.

The Project Execution Plan is still in very rough draft form and needs some intensive work. Those who were assigned responsibility for sections should work with Carol Wilkinson to complete their assignments by April 12.

Progress Updates

Progress updates for Advanced LIGO subsystem development for the period from January 1 through February 28 are complete and posted on the project website.

The next update will be for the period March 1 through April 30, due by May 5. Progress update files will be posted on the web and notices will be sent to subsystem leaders in advance of the due date.

Meetings & Reviews

Future near term planned meetings & reviews are indicated in the table below.

Changes since last report are listed in blue. Late or critical items are in red.

 

Date

Sub sys.

Review

Topic(s)

Enabling event(s)

Schedule motivation

Status

Jul 11-13,      ‘05

SYS

SYS Mtg

CDS infrastructure & HAM Isolation Req’s

 

 

Report in progress

12-Jul, ‘05

SUS

PDR, Review 2

Electronics req & design; Focus is on the front end electronics (UK) -- limited Digital controls/electronics (US) review

 

 

Report in progress

~Oct 05

SYS

PDR, Review 1

Engineering & Implementation ('generic') Requirements;
Interfaces
Revised Optical Layout
Optomechanical Layout

completion of generic requirements definition; completion of first draft of ICD; revision to optical layout; establish integrated opto-mechanical equipment layout

timely system level definition enables/helps define subsystem reqmnts & design

 

~ Nov 4, ‘05

SUS

SUS PDR

Review 8

Ribbon/Fiber/Ear/ Bonding PDR

Completion of the ribbon, fiber, and ear and fabrication and bonding design and processes

 

Report in progress

Nov 29, ‘05

SEI

HAM SAS  PDR

Review modeling, analysis, design for HAM soft system

Revised HAM SEI requirements.

Timely decision for proceeding with HAM SEI prototype.

Report Out. CCB approved 2/27/06

~Dec 05, ‘06

SYS

PDR, Review 2

CDS Infrastructure
Stable Recycling Cavities
Lock Acquisition
Modulation Scheme
Power Induced Instability

Sufficient CDS requirements & concept work (also 7/11-13 mtg)
E2E Modeling for AL
40m Progress on Acq. & Mod.

CDS Infrastructure is key to subsystem electronics req.
Stable cavity is key to IO MMT design

 

~Jan17. ‘06

SUS

SUS PDR Review 9

Wires for MC Triples

 

Timely report to allow progress on MC triple final design work

Report in progress

~Jan 06

IO

PDR Review 1

PDD, Faraday Isolator, RTP-based modulators

SYS PDR?

 

 Work delayed on

FI, allows more

systems to be

reviewed

~Feb 21 , 06

SUS

PDR, Review 5

Triple design

Available SUS/US staff

Enable SUS/US final design phase

 Delayed as Quad controls PT takes preced.

~Feb 22, 06

AOS

AOS DRR/CD

Review 1

Stray light control, PO mirror and telescope, optical lever, initial alignment system

SYS PDR?

Delay stray light control review until other systems can be reviewed at the same time.

Delayed from Oct. to allow review of

add. systems.

~Mar 06

IO

PDR Review 2

Mach-Zender, Adaptive mode matching, Mode Matching Telescope

Determination of whether a stable recycling cavity will become part of the AL baseline; SYS PDR 2

 

 Waiting for stable

RC decision

~April 11, 06

SEI

HAM isolation req’s review

Isolation requirements in HAM chamber

 

Need before reviews on single stage stiff system and SAS

Delayed by preparations for NSF review

~April 13      ‘06

SEI

CDR on single stage HAM SEI

Evaluation of single stage ISI design against revised requirements

HAM Isolation req’s review

Need for NSF baseline review in May

Delayed by preparations for NSF review

~April 06

SUS

PDR, Review 6

quad controls prototype test results
ribbon process/design

completion of LASTI testing; may need to have partial review with quad PDR before end of testing

timely incorporation into final design effort on the noise prototype

 

~May 06

SEI

HAM Critical Design Review

Recommendations w.r.t. HAM prototype development based on ETF results

Completion of SEI/BSC critical design reviews; LSC review of ASI HAM configuration design

Delay until requirements are revised. timely decision on proceeding with SEI/HAM prototype

 Delayed from Aug.

~May 06

COC

PDR

 

 Metrology, Handling fixtures, Coating, Cleaning Process, Optics prelim. design

SYS PDR?

 

 

~June ‘06

SUS

PDR, Review 3

Quad design

Completion of the quad controls prototype assembly; installation at LASTI

timely transfer, to RAL & UB efforts, of lessons learned from the controls prototype

 Delayed until shipping to LASTI.

TBD

AOS

AOS DRR/CD Review 2

 Thermal Comp., Photon drive

SYS PDR?

 

 Moved forward

 for timely finish

of AOS CDR’s

TBD

SUS

PDR, Review 7

BS, FM/ITM SUS design
RM design
non-cavity SUS

design work completion (has yet to start on FM/ITM, not mature for RM)

 

 

 

>From: Phil Lindquist lindquist_p@ligo.caltech.edu

Advanced LIGO Review Preparations

Positions Summary List – No progress although several system discussions did occur this week.

LIGO Operations Budget Model (FY 2006 - FY 2008) – No progress.

Projection of Advanced LIGO Operations Costs – No progress.

Project Execution Plan – No progress.

Seismic Isolation

From: Ken Mason <kmason@ligo.mit.edu>

Advanced LIGO Seismic Isolation Procurement Status

The two large plates which make up the optics table and the stage 2 center plate has been delivered. The last two large plates which make up the stage 2 keel is scheduled for delivery on Friday 1/31.

Myron and Fred have leveled the granite table and we will begin to assemble stage 2 after we recieve the keel plates on friday.

We have received all of the assembly tooling required to begin assembly.

Richard Mittleman has been troubleshooting the blade calibration fixture using "dummy" blades. The maraging steel blades have been shipped on wednesday and are scheduled to arrive at MIT on friday. We have worked with ASI to understand how to set up and use the calibration fixture. Additional design is still needed for shims to be used with the new softer springs.

Preliminary

From: "Joseph A. Giaime" jgiaime@ligo.phys.lsu.edu

Agenda for the weekly SEI telecom

Friday, March 10, 2:00 pm Eastern, 1:00 pm Central, 11:00 am Pacific time

BSC SEI status, w/ new targets: Ken/ Dennis,

  • Ken has redesigned the displacement sensor target to make use of the thinner high-purity aluminum that we have been able to buy.  We will have these made, with the request that they polish the face flat after bolting it to the holder.
  • Ken has spoken with Ken at ASI regarding the intended use of the blade test fixture, and learned of the purpose of several features shown in ASI's drawing.  The test method should be reproducible, albeit requiring a empirically-derived scaling factor to learn the true force.  We decided to proceed with assembly and spring testing.
  • Hardness tests performed on blades and rods.
  • Blades deformed by 0.004" during hardening.
  • Joe Hanson at LLO will set up to assemble and test the pods.  Ken will send the internal cable, and Jay will send a GS-13 updated circuit board.

BSC work, adaptive modeling and FIR (Rich M)

  • work concentrating on SUS debugging

ETF platform work

  • Thermal testing (Brian)
    • Three thermal sensors plus reference resistor installed in ETF platform's stage 1, and vacuum tests performed.  Changes at the several milli-degree level seen when 0.06 dSpace units DC offset turned on.  Normal operation at Stanford needs an rms value of about 0.1 dSpace units.  
    • Up to 50 mK change seen on the support table over  10 min test, and about 10 mK at the actuator.
    • Follow-up work with hour-long tests (to probe full time constant), indicates that the 0.06 dSpace units current should cause 35 mK, implying the normal operation power should result in an actuator temperature change of 0.5 mK.
  • Tickle testing (Matt)
    • Automatic diagnostics development system (i.e., tickle testing) progress shown here.
  • Frame damping (Tarm/ Brian)
    • 1 mm thick small square of dyad epoxied between frame and buttress beam, photos here.  60 Hz frame resonance's effect on rX response reduced by factor of 8 or so, as seen here.
    • Next up: adjust size of damping layer to look for an optimum.  The layer currently in use has a k of 5e5 N/m, and if this is implemented (probably by the SUS group) we would need to find a bellows that is less stiff than that.
    • There is also the question of how and whether the buttress would fit in current table layouts.  It might be difficult.
    • It also appears that the unbolting and rebolting of the lower structure resulted in a factor of ~4 Q change and a half hertz frequency change.  Attachment bolts are rubbing in their through holes, and they found that retightening the bolts in situ upped the Q to nearly its old value.

Suspension

From: Janeen Romie romie_j@ligo.caltech.edu

Held a fruitful Suspensions Workshop after the LSC meeting last week at LHO. Notes from the workshop should be available next week. Actions from it will be statused at the SUS weekly telecon.

After the workshop, I've been primarily working on NSF Review material.

From: Ken Mailand kmailand@ligo.caltech.edu

Bob has cleaned the fixture plates and hardware parts, work on the fixture including plating has been completed.  A full preliminary assembly has been completed, adjustments will be made tomorrow.

The smaller assembled lift table and minor modifications are complete, a shipping crate for the fixture and lift table, is ready.

Rod has contacted a shipper to pick up the crate from the synchrotron assembly area.  The assembly work has been completed on the quad setup fixture and table, it can be shipped Friday.

From: Helena Armandula ahelena@ligo.caltech.edu

 

From: Jay Heefner jay@ligo.caltech.edu

AdL SUS Controls Prototype

  • Preparations and testing of equipment and software needed to install the controls for the Quad at LASTI scheduled for next week.

AdL SEI ISI

  • More GS13 preamps are being stuffed and tested for LHO.
  • Completion of the capacitive position sensor chassis has been on hold for other higher priority tasks. It should be resumed in the next few weeks.
  • Additional L4C preamps were stuffed and sent to Stanford.

From: Rolf Bork <rolf@ligo.caltech.edu>

 

From: Ben Abbott <abbott_b@ligo.caltech.edu>

LED failures:

I have written up a report on the LASTI LED failures which can be found on my website here: www.ligo.caltech.edu/~babbott/LED_Report_new.pdf

Core Optics

From: Bill Kells kells@ligo.caltech.edu

No particular new "results" this period, but I have been participating in the intensified discussion and analysis (of the 4TIM07) data for understanding the situation for Adl with regard to cleanliness and contamination. In particular the particulate nature of the 4ITM07 contamination is being elucidated. One thing we are revisiting is whether there is similar contamination on the AR side (some initial investigations indicated not).

From: Gregg Harry <gharry@ligo.mit.edu>

The lutetium-doped tantala/silica coating has been partially evaulated for mechanical loss and optical absorption.  This was done at MIT, Glasgow, and Stanford.

MIT mechanical loss numbers by mode, for the three lowest modes, are 3.6e-4, 3.3e-4, and 4.2e-4.  Glasgow's cumulative phi at higher frequency is 3.8 +/- 0.5e-4. This is compared to a phi of about 4e-4 typical of undoped tantala/silica from CSIRO, so minor improvement at best in thermal noise performance.

Optical absorption measured at Stanford is 10-12 ppm, well above the 0.5 ppm advLIGO spec.  This is probably a fatal flaw, especially considering the lackluster mechanical loss.

Further coating work with CSIRO will likely focus on the silica doped titania which did show some improvements in thermal noise properties.

Input Optics

From: David Reitze <reitze@phys.ufl.edu>

Mechanical design and layout (Luke Williams) - This week I have worked on the aligo IO layout, routing all of the auxiliary beams (MC trans, MC refl, IFO REFL, FI MON1, FI MON2, HEAT1, HEAT2, OL1, OL2, OL3, OL4, OL5, and OL6).  A complete layout should be in the PDMWorks Vault by tonight.

EOM characterization (Wan Wu) - Our experiment is aiming at hunting the small variation of the modulation index with 10*-8/sqrt(Hz) (relative noise) near 10 Hz using two phase-locked NPROs, one modulated with the EOM. Currently, we have the two NPRO laser phase locked to each other with a 10 MHz offest and relative phase noise suppression below 1 mrad/sqrt(Hz). The current measurement sensitivity is limited by the laser intensity noise;  an intensity stablization servo for the laser is under construction.

Thermal Compensation in Advanced LIGO (Muzammil Arain) - We are playing around with the idea of using negative thermo-optic coefficients (TOC) material to compensate substrate thermal lensing in the ITM substrates. Initial research shows the viability of using calcium fluoride (CaF2) as the potential compensation plate material. Further investigations are being done into the material properties and availability of CaF2 and other compatible material.

LLO HPTF (Simon Stepuk, Ken Franzen) - The 100 W IPG laser was returned from UF and installed in the LLO HPLF. The new version of the laser is behaving well (!), except that the RS232 communication protocol has been changed. We are working on changing our LabView code accordingly to be able to monitor the laser.  We have also measured the thermal drift in a 100 W beam passing through calcite polarizers. It was found to be less than 20 microradians.

Faraday Isolator - The prototype AdvLIGO FI was tested for vacuum compatibility and failed miserably. This was not unexpected, because i) it was not assembled in a clean environment, and ii) the casing was not optimally designed for in-vacuum operation.  We are in discussions with the IAP group about this; the plan is to pre- clean and bake the components before assembly and then assemble at one of the sites in a clean environment.

Pre-Stabilized Laser

From: Peter King pking@ligo.caltech.edu

  • Elements of the PSL risk registry were completed and sent to Dwight.
  • I borrowed an Innolight NPRO from Eric Black (thank you) to measure the intensity noise to see if features seen with the OEM Mephisto model were commonplace.  At first glance the low-frequency intensity noise is different; however with the noise eater engaged, there is a large peak at approximately 50 kHz.

I have been sitting through the training material from Xilinx for setting up

Auxiliary Optics

From: Michael Smith <smith@ligo.caltech.edu>

SLC

Hiro has obtained some preliminary transfer functions for light injected into various ports in the ADLIGO RSE configuration without the optical spring effect. We are in the process of converting the transfer functions into the K-factors that I use in the scattered light noise analysis.

AOS COST & SCH

The AOS cost figures were updated and sent to Dwight Carter. I have revised the manpower requirements and am working on the schedule and the risk assessment.  I have completed the revision of the schedule and the risk assessment.

Controls, Data Systems

No report this week.

Other Laboratory R&D

From: Riccardo DeSalvo desalvo@ligo.caltech.edu

Missed several weeks due to travel.  This is more a monthly than a weekly.

Two Amaldi papers published and now available.  The third contribution, on optimized coatings, will be available later separately.

www.ligo.caltech.edu/~desalvo/Amaldi-HAM-SAS.pdf

www.ligo.caltech.edu/~desalvo/Amaldi-Flat-top-beam.pdf

Yumei

  • Done simulation and actual resonance measurements of magic wand prototype for Alberto Stochino's paper.
  • Done Simulation of resonant damper with different blade joints
  • Done simulations of HAM SAS Spring Box internal modes studying different stiffeners, report # T060066-00-E
  • Working on HAM SAS static load and IP counterweights

Valerio, Virginio

We are continuing to work on HAM-SAS simulations. We are trying to add the triple pendulum chain to our existing horizontal and vertical simulations. At the same time, we began to make noise measurements on the LVDT sensors that will be used in HAM-SAS. This will allow us to obtain more accurate control models simulations.

In the meantime we have evaluated two new software packages, Dynaflex Pro and BlockBuilder, from Maplesoft. The first is a completely symbolic mechanical simulator and so it can be integrated in the Maple models we already developed. BlockBuilder is able to convert any Maple object, e.g. motion ODEs, in linear objects - such as state-space, zero-pole-gain, tf - and to generate automatically Simulink blocks from Maple symbolic models. This last feature seems particularly useful since our control models are all made with Simulink.

Riccardo

  • Preparing HAM SAS production, kickoff meeting at Galli&Morelli next week
  • Designing SAS isolators for external optical benches.
  • Discuss future developments of Mesa beam test interferometer with LMA, Juri Agresti (Pisa), John Miller (Glasgow), and others.  We concluded that there is no advantage in building Mexican Hat mirrors small enough for the present 7 m rigid structure cavity.  Such small mirrors are hardly feasible and would cost more tha building a longer vacuum system with larger, cheaper mirrors.  Following that consideration we are studying the feasibility of a longer, fully suspended interferometer.  This study, as well as completion of the measurements with the present setup, and studies of beam stability in power recycled mode, are expected to be part of John Miller doctoral thesis.
  • Working with Marco Tarallo and John Miller in writing up the paper including the experiments and data collected so far with the MH interferometer.
  • Discussed at LMA Optimized mirror options with Vincenzo Pierro (Sannio) and the local experts.
  • Reviewed the local method to measure material Q-factors on coatings on thin diving boards.  The techniques to evaluate systematics improve the quality of the data treatment, and possibly measure poisson and Young moduli.
  • Discussed the possibility to increase the data quality by using diving boards welded to thick substrates, contributed by Glasgow.

For additional information about this report, contact S. Whitcomb or P. Lindquist