Weekly Report for Week Ending April 27, 2006
The LIGO Executive Committee Agenda for Monday, May 1, 2006 will be:
(Meeting time: 10:30 am Pacific Time)
1. Announcements
2. Comments on Weekly Report
3. LSC Issues (Saulson)
4. LIGO Lab Operations
- Administration (Lindquist)
- Sites (Raab, Zucker, Shoemaker)
- Commissioning (Fritschel), Detector (Coyne)
- Campus Research Facilities
- 40 Meter (Weinstein)
- TNI ( Libbrecht)
- LASTI (Shoemaker)
- Data Analysis and Computing (Lazzarini)
5. R&D and Advanced LIGO (Shoemaker)
6. CHANGE CONTROL BOARD/TECHNICAL REVIEW BOARD SESSION AS NEEDED
- No open change requests
Special Items:
- Preparations
for Advanced LIGO Review (May 31 – June 2)
Special Announcements:
LSC Issues (Saulson)
Progress has been made on staffing the offices called for in the newly-approved LSC Bylaws. We have now nominated the Chairs of the four standing committees that come with an automatic seat on the LSC Executive Committee. (These nominations are subject to approval by vote of the LSC Council.) The new Chairs are: David Shoemaker (Advanced Detector Committee), Keith Riles (Detector Characterization Committee), Marialessandra Papa (Analysis Committee), and Fred Raab (Operations Committee.) This last nomination is made jointly by the whole Directorate.
We are now working on finalizing the nominations for Chairs of other standing committees, and on selecting other appointed members to serve on the committees.
LIGO Laboratory Administration (Lindquist)
STATUS OF LSC MOUs (Lloyd)
- No report.
SITE TELECONFERENCE (Lindquist)
- There was a site teleconference Thursday, April 27, 2006. The following were among the items discussed:
- Status of Outreach Grant—We distributed a spreadsheet showing budgets, costs, commitments and estimate-to-complete. Things are close and must be watched.
- Kinetic Façade--$21K mod to HPD today; $10K mod issued to Exploratorium.
- There are currently no open action items. The list of assigned actions updated through December 01, 2005 (the last update) will be found Here.
PROPERTY MANAGEMENT (Luna)
>From: Rod Luna <rluna@ligo.caltech.edu>
- No report (out of office).
DOCUMENT CONTROL CENTER
>From: Linda Turner - turner@ligo.caltech.edu>
- No report (vacation).
>From: Cleveland Mak <mak_c@ligo.caltech.edu>
- Processed another large batch of revised HAM drawings from Promec.
- Extracted all non-electronic 'P" document files from the shelves for scanning.
- Scanning - Scanning of contract closeout files have been put on hold to begin scanning of non-electronic 'P' documents so every 'P' document in the database is electronically available.
- Activity:
|
Week Ending 04/27/2006 |
In |
Out |
|
Packages |
26 |
13 |
|
Faxes |
18 |
22 |
FINANCIAL SYSTEMS (Cronin, Brambila, Kaufman)
>From: "Cronin, Holly" <Holly.Cronin@caltech.edu>
- For ACCOUNTS PAYABLE HISTORY DATA Press Here.
>From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>
- Working on completing the change orders to the Exploratorium, NorCal, and High Precision Devices.
- Completed change order #41 to Northrop Grumman to bring the cumulative totals in sync.
- Completed the orders for Dynamic Systems to order computers for Caltech and LHO.
- Completed
several no-cost extensions for the following subcontracts:
- Completed change orders 172 and 173 for Triad.
- Placed
several orders for goods to be exported directly from the vendors to
- Reconciled the monthly pcard report for April 18, 2006 and submitted the report to management for approval.
>From: Florence Kaufman <fkaufman>
- Worked on updating monthly reports.
- Updated analysis on Outreach Award prepared by Phil Lindquist to reflect April data to date.
- Financial reports can be found at: http://docuserv.ligo.caltech.edu/~fireport. (For passwords contact Florence)
SUBCONTRACTS MANAGEMENT (Jasnow, Salone)
>From: Gina Salone <gsalone@ligo.caltech.edu>
- Nothing significant to report.
>From: Ed Jasnow <jasnow@ligo.caltech.edu>
- The Galli & Morelli contract for the HAM-SAS has been signed by the contractor and is awaiting signature by Caltech. We are waiting for official approval of this contract from the NSF.
- A letter has been sent to DEMCO, provider of electricity to LLO, stating that we would like to go to electronic funds transfer (EFT) to provide them payment. The letter contained a form to be filled out to initiate the EFT arrangement.
- The LLO SEC construction remains slightly ahead of schedule due to continued dry weather. The contractor is proceeding with interior work now.
PROPOSALS and REPORTS (Lindquist)
See Advanced LIGO below.
The NSF has approved the funding for LIGO Operations for the second half of FY 2006.
CHANGE CONTROL/CONTINGENCY MANAGEMENT (Lindquist)
- No open change requests.
HUMAN RESOURCES (Akutagawa)
>From: Cindy Akutagawa <cindy@ligo.caltech.edu>
- The next Staffing Committee meeting is scheduled for 5/15.
- 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
A draft of action items from the recent
LIGO Hanford
Summary of Commissioning Activities at LIGO
LHO interferometers ran at high duty cycle (H1 88%, H2 84%, with H2 logging almost twice as many segments as H1). AWG (exc dropouts, reboots) and framebuilder (potential corruptions >~1/16th second) issues were of concern, see details below. Ranges were about 7Mpc on H2, and ~13Mpc on H1. The latter IFO has still not returned to its pre-power-outage, pre-LLO-commissioning, pre-PEPI-hardware-mod stable regime of about 14Mpc, with near-flatline inspiral range.
Commissioning highlights are bulleted below:
- AWG excitation processor problems occured with great regularity this week; pulsars/insp/burst excitations were dropped five times in five days. Although concerns were raised about rogue excitations on the interferometers, this turned out to be the typical scenario of AWG EXCs without a testpoint and thus no place to sum into an IFO. AWG impact on pulsars was logged here. H2 ETMX excitation dropouts were indeed observed. These woes led to a test of the AWG bypass, which was successful in allowing an AWG processor to be booted without knocking an IFO out of lock.
- PEM fixes were effected on channels identified as problematic by S5 scimons
- parking the RM has to be done carefully to avoid unnecessarily illuminating wires; camera views indicate we're doing a reasonable job of this on both IFOs
- recent range and duty cycle plots were made
- a 3.4Hz resonance in EY was observed to be driven by winds
- an analysis of HVAC contributions to seismic noise is presented for the LVEA and outbuildings
- H1 ISS, FSS gains have been mobile since the start of S5. Coupling between ISS and FSS with respect to glitches was investigated and gains reset.
DAQ
- h1adcuex spontaneously reset itself
- people chased the issue of occasional corruption of frame data, comparing objects and images on fb0 and fb1; despite the same code, the image differences were ~300Mb. Patch levels will be unified on the two framebuilders.
LIGO Livingston
Observatory (LLO) and Interferometer Operations (Zucker)
No report.
Initial LIGO Detector Science & Engineering (Coyne)
Nothing significant to report.
40-Meter Interferometer (Weinstein)
IFO Commissioning
- Osamu, Dan and Monica continue to develop the noise budget. Above 100 Hz, the ~ few * 1e-13 m/rtHz is entirely due to dark noise (electronics, etc). Oplev noise is significant in the 10-100 Hz range. Seismic noise dominated below 10 Hz, but there's a factor ~8 discrepancy in the absolute prediction; under investigation. Steve is moving the accelerometers around the lab to see how much variation there is in the spectrum. But the calibration of the accelerometers is in question.
- Rob and Rana worked on lock acquisition. They have not yet managed to reduce the CARM offset to get to full power in the AdLIGO configuration, ever since the laser swap in November/December. They are working through all the changes and all the places where noise could be getting in.
IFO Modeling
- Monica and Osamu adjusted the demod phases in her e2e simulation of the 40m, and now the simulation goes to full power at the correct AdLIGO configuration.
DC Detection and Vacuum Squeezing Development
- Rob and Sam have set up the output mode matching telescope (OMMT) and aligned it using a pair of autocollimators. The alignment is difficult, there aren't enough knobs to adjust; but they got it to work. We have a crystal laser from LLO that we will use to align the OMMT with respect to the ouptut mode cleaner and lock the OMC.
- Ben finished stuffing and testing the DCPD in-vac electronics board and delivered it to the lab. It is now being set up for test.
- Ben is about done drawing the schematic for the DC Detection QPD Whitening Chassis. He will start laying out the PCB sometime soon.
- Go tweaked the input beam to his his second harmonic generator and was able to increase the green light from 300 mW to 350-400 mW.
- Go has updated his conceptual layout for the squeezer and squeezing detector system on the PSL table.
- Go is now putting together the beamlines that go into and come out of the OPO (which Evgueny is bringing next week). He designed three-lens mode-matching telescopes for the input and output beams. He's also discussing with Osamu and Steve about the placement of the pickoff mirrors needed to inject the squeezed vacuum into the asymmetric port.
Electronics, Controls, Computers
- Osamu and Dan measured the noise at the RF output of the AP166 RFPD (our DARM signal), and found it to be ~ 50nV/rtHz, not unreasonably large.
- Rob continues to make improvements and add useful features to the length sensing and lock acquisition front end code.
- Rana and Dan measured the noise spectra on all 4 quadrants of both WFSs in the mode cleaner alignment servo; there are no obvious anomalies, and the alignment system seems to be working reasonably well. The fear that the WFSs were fried during some beamline work appears to be unfounded.
- Rana and Sam rewired the RF signal generators to frequency lock them to each other properly. Now there should be no more ringing in the cable or standing waves. They also tied the 29.5 MHz IMCR oscillator to the others; So we should have less wander in the intermodulation AM produced by the Mach-Zender.
- Rana and Ben figured out the installation wiring and module needs for the new MC Servo. We have most everything that we need to get started. Once we start, it should be one or two days of down-time until the new servo is operational.
- Ben made a BNC switchbox with one BNC in, and four switchable BNC outputs, for Go.
- The PSL still appears to be losing power, as reported by the PMC transmitted PD. Steve has installed a new PD before the PMC to monitor the power just as it exits the MOPA. It needs to be interfaced into DAQ/EPICS.
- The PSL FSS loop drifted into saturation, which has happened several times before. Osamu traced this to a slowly falling amount of tight transmitted through the reference cavity. He tweaked the alignment and brought the transmitted power up a bit, but it is still only 2/3 of what it was 3 months ago. There is a sharp drop that occured on March 28. Under investigation.
Thermal Noise Interferometer (Black)
Akira took difference data with the ring-dampers
in place. Attached is a noise plot. Note the obvious widening of the mirror
mechanical mode peaks, due to the reduced Q's. Also note the unchanged coating-
thermal-noise-dominated noise floor between 5 and 20 kHz.
The latest models from Dennis Coyne, Riccardo Desalvo, and Phil Willems indicate that the hump between 1 and 2 kHz is due
to low-Q mechanical modes of the o-rings themselves..
LASTI (Ottaway)
Controls Prototype Installation
The quadruple pendulum is aligned and ready for testing in the BSC. The chamber has been closed and pumping down has begun. Refer to the Lasti ilog for details on what was done the past 2 weeks, http://www.ligo.mit.edu/ilog/.
BSC Internal Seismic Isolation (ISI)
Fred Miller is continuing to assemble the ISI and is almost done with stage 2. Next week the test stand will be modified so that it can accommodated the ISI and the assembled parts will begin to move to the test stand.
Data Analysis and Computing (Lazzarini)
Simulation and Modeling (Yamamoto)
QuadFP (Hiro Yamamoto)
Hiro is modifying the FP module with quad pendulum to include ASC modules. Several modules are modified to use external CC/H files to make it easier to maintain and develop. Some source codes were changed to make this easier to do.
40m modeling (Monica Varvella)
The demodulation phases of the error signals controlling the signal recycling and the power recycling cavities have been adjusted : now those error signals (SP133I for the PRC and POX199I for the SRC) cross the zero at the locking point and there is no power leaking anymore in all cavities.
Adv.LIGO Mechanics modeling (Sany Yoshida)
Built e2e box files to simulate Advanced LIGO quad-sus by including a state space matrix created by Mark Barton™fs Mathematica model (case 20031114). The box file is being tested by feeding white noise input to the six DOFs at the suspension point (one DOF at a time) and looking at the response of the final stage (optic). The test results seem to be reasonable.
Started to build e2e box files to simulate AdvLIGO passive seismic isolation. The first box file includes a state space matrix generated by Valerio Boschi to simulate the horizontal stage. This box file will be tested soon.
e2e / SIS(Static IFO Sim) Code Development (Bruce Sears, Hiro
Yamamoto, Melody Araya)
Bruce is working to introduce mechanism to control the output data. Usually, full IFO simulation has several 100 outputs, while 1/10 are of interest for some specific research. The new mechanism makes it easy to suppress unnecessary outputs. This will speed up the simulation (due to less disk access) and the analysis (faster data loading and easier access to necessary data).
Melody worked to implement a mechanism to connect the user interface part and the actual objects using the user setting, and Hiro started using this mechanism in the SIS code. Hiro is still developing the pieces for SIS, like propagator and generic map objects.
Alfi (Melody Araya)
Melody is working to modify alfi to support sticky note, which will serve the role of text comments in the traditional programming.
Data Analysis Activities (Lazzarini)
Brown
- Attended
APS meeting in
- Attending Condor week conference.
Chatterji
- Attended
APS meeting in
- Continued writing a proposal for a mock data challenge using 3 hours of single detector GEO, LIGO, and Virgo data
- Follow-up investigation of recent framebuilder data repeats
- Installation of qscan on a dedicated machine at LLO
Dupuis
- finished analyzing first 6 months of S5 data for 7 selected pulsars
- working on looking at pulsar J0537-6910 on a weekly basis throughout S5
- debugging a code I wrote to look at the pulse profile of any candidate pulsar signals
Mendell
On behalf of the LIGO Scientific Collaboration, I presented in Session W11
the "Stackslide search for continuous
gravitational waves using LIGO S4 data" at the April 2006 APS meeting in
Shawhan
- Attended
the APS Meeting in
- Working on updating the readMeta MEX-file in LIGOtools, based on suggestions from Thomas Cokelaer.
Yakushin
- Attended
APS meeting in
- Running coherent waveburst on S4 LIGO-GEO data.
LIGO Data Analysis System
Software Systems (Blackburn )
LDAS
Efforts were focused on overcoming hung NFS calls. After several attempt, it appears as if the NFS calls cannot be interrupted. More testing needs to be done to understand the full impact this will have on the diskcacheAPI. It is currently known that a call to fork will cause the diskcacheAPI to become unresponsive. Knowing this, all programs that are 'exec'ed need to be removed and appropriate C calls made instead.
The work of cleaning up the hard coding of /ldcg/bin/tclsh continues.
The documentation describing the -returnprotocol and -outputdir options for dataPipeline (PR#2121) has been updated and a regression script has been created to test correctness.
Additionally several bad links have been fixed on the LDAS web pages.
System testing was done using ldas version 1.8.158.
TCLGlobus
Work has started on producing a simple submit client. The goal is to create a light-weight client that can be installed on a user's local system with a minimum of effort (see GRID COMPUTING for more details).
TCLGlobus has been built against the 4.0.2 release of Globus. There were no changes need to the TCLGlobus source base and all tests complete successfully.
GRID COMPUTING
The inspiral pipeline was validated on UWMilwaukee's new installation of OSG 0.4.0.
Downgraded to glibc 2.3.5 and the 2.6.15-1.1831_FC4smp kernel on the submit host in order to continue to use Condor-G/DAGMan. Latest yum updates of glibc and kernel are not compatible with the releases of Condor supported by the Condor team.
Eight ITB sites were validated with the inspiral pipe app during the OSG 0.3.7 ITB.
Attended a STORAGE-TG meeting on the goals and road map of the TG.
Attended OSG telecom on OSG 0.3.7 validation results.
Held a meeting to bring together element of TclGlobus and OSG Application development to leverage the experiences the LDAS team has had developing Globus client server tools. The goal is to develop a client for submitting LIGO jobs on the OSG that is much lighter than t
Hardware Systems (Anderson
Caltech
(Dan Kozak)
- Did some work on samtest:/samtest and the 3510 that houses it as part of the ongoing effort to characterize the problem when large numbers of files in a QFS filesystem are deleted.
- Ordered lots of parts from Sun, received some of them.
- Normal tape ingestion stuff.
- Continued to try to close the gap on L0 files that haven't made it to CIT in a timely fashion.
- Worked on an odd bad tape at LHO which fails but doesn't get marked 'E'. Am rearchiving what I can and then filling in the gaps from the CIT copy (ongoing).
- Worked with Ed Maros to help him figure out how to keep the diskcacheAPI from getting stuck when NFS servers with frame data on them crash.
- Gave Sean Cochrane (Sun) some followup instructions vis a vis the QFS metadata benchmarking efforts.
- Finished registering the backlog of S4/5 L1/3 h(t) data in the CIT cluster with RLS.
- Rebooted ldas-pcdev2.ligo.caltech.edu (CIT) to fix an NFS problem.
(Phil Ehrens)
- This week, while Stuart Anderson and Erik Espinoza are at "Condor Week." I have been maintaining the cluster. The cluster has been pretty quiet so far.
- I have been examining the configurations of ldas-grid and ldas- pcdev1 and ldas-pcdev2 and migrating some configuration from ldas-grid to the other two machines to support user needs to execute tasks via cron.
- Various certificate management related tasks.
- Further development of the log_mon.tcl integrated log analysis and system monitoring/reporting tool to reduce the number of emails sent without reducing the amount of information sent. changing the scan interval from 15 seconds to 60 seconds seems to be a big win.
- Began installing log_mon.tcl for monitoring of the Millikan desktop systems.
(Erik Espinoza)
- CondorWeek 2006
(Stuart Anderson)
- Continuing to test latest version of SAM (looking good so far).
- Started testing latest 3510 FC RAID firmware upgrade.
- Attending CondorWeek 2006.
MIT
(Keith Bayer)
- Replaced node31 primary hdd (failed) and resync'd to mirrored secondary hdd
- Had Mayflower Transit do site spec for transfer of 70 old cluster units to WSU
- Shuffled data around for DMT users
(Igor Yakushin)
- To diagnose tape drive 46 that stopped working last week (suspected power supply problem), StorageTek engineer swapped power supplies for drives 46 and 45 today. So far all the drives seem to be working fine.
- Ejected and shipped to CIT 10 tapes.
(Greg Mendell)
- I have added a cron job that runs once per day at CIT which fixes occasional RLS errors during the LDR transfer of RDS data from LHO and LLO to CIT. I am working to extend this to trend data.
(Ben Johnson)
- Received kickstart unit. I successfully racked and powered up the unit.
- Finished first (and final?) version of a .frame.cache-based LDRdataFindServer. It is currently running at Caltech.
- Found two corrupted files at LHO from April 20. They do not have an obvious cause (front-end reboot, framebuilder reboot). The typical parties have been informed and are also investigating the matter.
- Back-porting .frame.cache-handling code to my publishing scripts from the LDRdataFindServer work. LLO h(t) publication started with this new code. Still waiting for LHO h(t) generation to resume.
General Computing (Wallace)
MIT
(Keith)
- Worked on IPF firewall rules with Solaris 10
- Rebuilt windows laptop for scientist
- Investigated webcamXP
- Working on upgrading DNS/DHCP routers for wireless
Livingston
(
- Renewed the Matlab contract, upgraded the software install, and updated the license server.
- Modified the firewall to allow for the matlab license server.
- Received updated quotes from Charter Communications for a backup internet connection.
- Worked with the fiber construction contractor from Charter Communications on the easiest route to run fiber for Charter. Settled on a primary solution with a couple of alternatives. This greatly reduced the amount Charter was quoting.
- Restored some user files from backups. Some of the users files became corrupt and had to be restored.
- Swapped out some bad cables on our KVM attached to the servers.
- Received & unpacked a replacement PC for Sany. Will install for him in the next couple of days.
- Working on an issue with out Mathematica license server. Claims the license is expired. Still haven't figured out quite what the problem is.
Hanford
(Christine)
- Started
setting up a Fedora C4 laptop to be used as a
- Still working on getting quotes for the PR to upgrade the user account disk and backup hardware and software.
CIT
(Bruce Sears)
- iLog Maintenance: (0.5 days) Completed planned iLog upgrade at Caltech and general maintenance at the sites.
(Mike)
- Built a replacement "Real Media" server. I am still testing the new media software, "Helix Server" that Larry purchased for this project.
- Training on PDMWORKS.
- Continued work on spam filters, searching for false positives.
- Held down the fort while Larry was away.
- Worked on cleaning up home accounts, and working the mail servers.
(Christian)
- Installed Axis webcam in the control room with Mike.
- Florence- Hardware failure on workstation. Rebuilt and updated new system with Windows XP and with the latest patches.
- Updating the Ligo Inventory IP address database.
- Replaced toner and drum kit on Irene's local printer.
- Reinstalled Adobe Acrobat 7 on Dot's workstation.
- Created a backup of Gina Salone, Dorothy Lloyd, Riccardo Desalvo, and Ed Jasnow workstation.
- Continuing working on updating all of the visitors' workstation this week.
- Other misc: Continued onsite software/phone support.
(Veronica)
On vacation
(Larry)
- Purchased a number of items. The matching grant order for the SUN equipment has gone through the system, thanks to Dot and Ruth. Ordered a number of misc. items for other groups. Placed an order for a new projector to test out.
- So far the response to the updated AUP has been pretty good. Most of the users have sent in an acknowledgment and a few good questions have been brought up. We are working on a FAQ to cover some of the questions.
- The dual core quad cpu unit sent back to Monarch is still being worked on. They have been able to verify the problem, they are now trying to find out the cause in order to get it repaired.
- Assisted Mike in resolving few server problems that popped up while I was out last week.
- Assisted the DCC in a couple of items. Attended the mtg. concerning the new system.
- Worked a number of user accounts. Presently, generating a new list of users to be removed from the system.
- Worked the spam filters. Changed the limit so there would be fewer false positives but this will also allow more spam mail through.
Mail Statistics for April 20-26, 06
|
Mail Statistics |
April 27, 2006 |
|
Rejected Messages |
33,209 |
|
Virus Messages |
1,263 |
|
False Positives |
300 |
|
Accepted Messages |
19,123 |
|
Total Messages |
52,332 |
Advanced LIGO and Supporting R&D (Shoemaker)
Advanced LIGO Systems, Management
Preparing for the baseline
review. Internal reviews being held this
and the next two weeks.
Seismic Isolation
Assembly of the BSC stiff
prototype going well. See photos at http://emvogil-3.mit.edu/ilog/pub/ilog.cgi?group=lasti&date_to_view=04/28/2006&anchor_to_scroll_to=2006:04:28:11:12:25-brett
and nearby.
From:
"Joseph A. Giaime" jgiaime@ligo.phys.lsu.edu
From: Jay Heefner jay@ligo.caltech.edu
LASTI HEPI Conversion
- Continued design, ordering and
test of all parts needed for the LASTI HEPI conversion that will start on
May 8. All electronics components should be in house and ready for a test
at CIT by the end of this week. They will then be packed and shipped for
installation.
AdL Cost and Schedule
- Completing minor adjustments
to SEI cost estimate for 5 HAM, single stage option.
From: Riccardo DeSalvo desalvo@ligo.caltech.edu
The HAM SAS production is
proceeding. From now on we will hold
regular meetings at 8-9 am US-PT on Wednesdays
Sshort minutes of the first meeting
Pre-production dwgs revisions are finished -- Chiara
& Gianni are finding little items & fixing during the production Chiara is also updating the Bill Of
Material (BOM) list clarifying
all parts and according to which drawing version are being produced keeping a
status list of parts in fabrication -- posted on the G&M web site
also making a schedule for the HAM-SAS fabrication & assembly efforts
expect to be ready for dirty assembly by 2nd week of June Riccardo: will revise the assembly procedure
Materials for the weld
samples have been laser cut, test samples being done this week by Tecnoinox, then sent to Caltech for inspection several
already machined GAS filter plate parts are being cleaned & baked -- to be FTIR tested by Eurolab in Modena G&M are setting up/cleaning the clean assembly
space
LASTI test
instrumentation
Dave suggests 6 L4Cs plus
an STS2 (or 3) (including locker/unlocker) on the
optics table plus 3 Guralps on the floor -- see LASTI
elog entry today (un: reader, pwd:
readonly) for expected HAM-SAS performance in the
LASTI seismic environment and comparison to instrument noise floors
Dave hired UROP student to
look at triple-SUS on HAM-SAS optics table for dynamic interaction
Jay ordered cables in
consultation with Ken Mason -- not enough cables ordered -- will
determine with Ken the number of in-vac cables to
order & place order soon
Simulation &
Controls Design (Virginnio, Valerio,
Yumei)
a) Mechanical
Modeling: status of Maple scripts for state-space modeling (Valerio)
Valerio & Virginnio
have developed a symmetric (no cross-coupling, yet) model of the HAM-SAS system
using Maple scripts. The model does not yet include elastic modes. The model
can be exported as a state-space model to Matlab/Simulink
for controls design/analysis. A horizontal model of the triple-SUS has been
built using Maple scripts and a vertical model will be built soon. The triple
model will then be coupled to the HAM-SAS model (including back reactions and
coupled dynamics).
b) Inverted Pendulum (IP)
and GAS filter wand dynamics modeling (Yumei) GAS
filter counter-balance ("magic") wand
elastodynamic
analysis, lowest resonant frequency > 184 Hz, which is more than
adequate, Yumei
is currently modeling the IP dynamics with counterweight in ANSYS www.ligo.caltech.edu/~desalvo/HAMSAS/Yumei-magic-wand.ppt
Jay sent out block
diagram for the main pipeline, servo-controls processing
Jay says power (AC &
DC) for HAM-SAS is already available at LASTI, may need another rack from LLO
A HAM-SAS
development" web page can be found here: http://www.ligo.caltech.edu/~coyne/AL/SEI/HAM_SAS/HAM-SAS_development.htm
including minutes from
the weekly meetings.
Suspension
From: Janeen Romie romie_j@ligo.caltech.edu
Advanced LIGO Suspensions
Worked
at LASTI last week on the quad osem alignment and
other quad tasks in preparastion for closing the
chamber this week.
I've been working with Brett, Pradeep and Jay this
week, to work out final cabling, osem &
electronics issues. Participating
in Linda Turner's New DCC Document Mangagement System
meeting.
Participated in Carol's
NSF Review preparation meeting last thursday.
I am working on editing the SUS WBS dictionary today.
Worked
with Dwayne on Friday to load Solidworks and PDMWorks on my desktop (thank you, Dwayne.) He will uninstall and re-install
those on my laptop when he gets back. Participated in the Solidworks/PDMWorks tutorial yesterday (thank you, Calum.)
LLO Science Education Center
HPD will hold a preliminary
design review tomorrow. They've provided their viewgraphs for review.
From: Ken Mailand kmailand@ligo.caltech.edu
I'm
working on a lower quad installation arm concept, and will send out an email for
comments and input.
Core Optics
No report this week.
Input Optics
From: David Reitze
reitze@phys.ufl.edu
EOM
amplitude and phase stability measurements (Wan Wu) - improving laser intensity
stablization. A PI controlled feedback circuit has been built and under test
now. We are aiming at reducing the laser intensity noise to be below 1x10-7/sqrt(Hz) as the first step.
Thermal Compensation in
Advanced LIGO (Muzammil Arain)
- As a follow-up of the LSC meeting talk about using negative dn/dT material for= substrate thermal compensation, a
document titled: "A Note on Substrate Thermal Lensing
Compensation using Negative Thermo-optic Coefficient Material",
LIGO-T060077-00-Z has been submitted to DCC. This document describes the basic
concept and some initial research about calcium flouride
as a potential material. Related to the thermal lensing
effect, another document titled: "A Note on Optimal Spherical
Approximation to Thermal Lensing,
" LIGO-T060080-00-Z has also been submitted that deals with the
estimation of radius of curvature associated with the thermal lensing.
Faraday
Isolator/Electro-optic Modulator review (Dave Reitze)
- putting finishing touches on viewgraphs for tomorrow's preliminary design
review
Advanced LIGO NSF Review
(Dave Reitze) - working on presentation for IO
subsystems
Pre-Stabilized Laser
From: Peter King pking@ligo.caltech.edu
I scanned in the remaining
vendor quotations from costing the PSL, as part of the backup material.
The problem encounted with the Xilinx system generator software requires yet another software package which doesn't come bundled. An evaluation version of the other package has been ordered. The case is in suspension with Xilinx's technical support. I have been able to simulate the filter in software and simulate the hardware. However when it comes to generating the bitstream for the DSP and combining it with Simulink the show falls apart.
Auxiliary Optics
From: Michael Smith <smith@ligo.caltech.edu>
LAYOUT
Chris Echols,
has found some errors in the solidworks model of the
BSC and is in the process of updating the model. He has been studying the
administration of PDM Works so that he can assume Callum's
role.
I am in the process of
placing the upgraded Zemax optical layouts, including
Hartmann beams, telescopes and steering mirrors for TCS into PDM Works.
PO TELESCOPE
I found a source in
NSF REVIEW
Working with Phil, we have
generated power point presentations for AOS Costs & Schedules, and AOS
Technical description.
Other Laboratory R&D
From: Riccardo DeSalvo desalvo@ligo.caltech.edu
Peter Raffai (
Alberto Stochino/Yumei finishing
Magic Wand paper.
For additional information about this report, contact Stan Whitcomb or Phil Lindquist