There will be no LIGO Executive Committee meeting scheduled Monday, December 10, 2007 due to the Staffing Committee meeting scheduled that morning.
LSC
Issues (Reitze)
- Publications:
- The S5 paper "Implications for the origin of GRB070201 from LIGO observations" has been submitted to the Astrophysical Journal.
- The S3/S4 paper "Search for gravitational waves from binary inspirals in S3 and S4 LIGO data" has been provisionally accepted in Phys. Rev. D. The reviewer noted: "This is a very fine piece of work, with interesting scientific results. It is quite well and clearly written. It was a pleasure to read."!
- Erik Katsavounidis has been re-elected as the co-chair of the Burst search group.
- A total 42 LSC and 4 LSC-Virgo abstracts were submitted to the Gravitational Wave Data Analysis Workshop.
LIGO
Laboratory Administration (Lindquist)
STATUS OF LSC MOUs (Lloyd)
MOU status remains as reported last reporting period (see below).
- The table below shows the MOUs and their attachments that have been approved and signed off to date by both the LSC Spokesperson and the LIGO Laboratory Director.
| MOU |
Attachment |
| Andrews University |
DAT, OPS, Z |
| Carleton College |
DAT, OPS, OUT, Z |
| Embry-Riddle University |
DAT, OPT, SUS, Z |
| Eotvos University |
DAT, OPS, OUT, Z |
| Florida, University of |
ACF, DAT, LAS, OPS, OPT, OUT, SUS, Z |
| Goddard |
DAT, OPS, Z |
| Hobart and William Smith Colleges |
DAT, OPS, Z |
| Institute of Applied Physics |
OPT, OUT, Z |
| IUCAA |
DAT, Z |
| Louisiana Tech University |
DAT, OPS, OUT, Z |
| Loyola University |
DAT, OPS, Z |
| Maryland, University of |
ACF, DAT, OPS, Z |
| Montana State University |
DAT, Z |
| Oregon, University of |
DAT, OPS, OUT, Z |
| Rochester, University of |
DAT, Z |
| Southeastern Louisiana University |
ACF, DAT, OPS, Z |
| Stanford University |
ACF, DAT, LAS, OPS, OPT, OUT, SUS, Z |
| Texas-Austin, University of |
DAT, OPS, Z |
| Texas-Brownsville, University of |
DAT, OPS, OUT, Z |
- ACIGA is still under review.
- Northwestern, Sannio and Washington State are pending, requiring changes requested by the review panel.
PROPERTY ACCOUNTING (Luna)
- Assisted K. Mason at MIT in making shipping arrangements for four crates from High Precision Devices in Boulder, CO to LHO.
- Assisted K. Mason at MIT in making shipping arrangements for three crates from High Precision Devices in Boulder, CO to AstroPak in Downey, CA.
- Assisted K. Mason at MIT in making shipping arrangements for two crates from High Precision Devices in Boulder, CO to LLO.
- Assisted K. Mason at MIT in making shipping arrangements for two crates from High Precision Devices in Boulder, CO to CIT.
- Assisted K. Mason at MIT in making shipping arrangements for one crate from High Precision Devices in Boulder, CO to MIT.
- Assisted K. Mason at MIT in making shipping arrangements for six boxes from High Precision Devices in Boulder, CO to Planning Systems in FL.
- Assisted K. Mason at MIT in making shipping arrangements for one crate from High Precision Devices in Boulder, CO to Stanford University.
FINANCIAL SYSTEMS (Funaro, Brambila, Oracion)
>From: "Funaro, Catherine" <Catherine.Funaro@caltech.edu>
>From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>
- Issued purchase orders for goods and services. Issued change orders to po's and subcontracts.
- Responded to inquiries on invoices, on orders that have not been delivered.
- Provided assistance with Techmart.
- Coordinated the return of a package to the requisitioner.
- Routed subcontract packages for approvals and to vendors.
- Closed out several subcontracts.
>From: Karl Oracion koracion@ligo.caltech.edu
- Started expenditure analysis, invoice review, budget review and data entry for November 2007 (FY2008) and November 2007 (FY2007) monthly operations report.
- Sent out reports for Visitor's Program and MIT.GRID.
- Reconciled MIT 11/07 invoice to MIT twonk report for payment
- Met with project accounting/IMSS personnel to discuss possible enhancements to operations report (on-going).
SUBCONTRACTS MANAGEMENT (Jasnow, Salone)
>From: Ed Jasnow <jasnow@ligo.caltech.edu>
- Accounts Payable has put an additional person, Monique Leagons, on LIGO invoices to ease the transition to the new payable system. Since Monique has been working on LIGO, there have been no further problems in paying invoices.
HUMAN RESOURCES (Akutagawa)
>From: Cindy Akutagawa <cindy@ligo.caltech.edu>
- The next Staffing Committee meeting is scheduled for Monday, December 10, 2007.
- The minutes and action items from the last 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.
Quality/Safety (Tyler)
Important LIGO Safety Notice:
The Directorate and LIGO Safety have scheduled an
"ALL-HANDS-SAFETY-MEETING" for 19 December 2007 at 1100 PST. All are encouraged to attend this one hour meeting in person at Caltech and via the web for off campus LIGO locations. A second All-Hands-Safety-Meeting will be scheduled early next year to complete a review of safety topics important to ensure safe and successful completion of Enhanced and Advanced LIGO work.
LIGO
Hanford
Observatory (LHO) and Interferometer Operations (Raab)
Summary of post-S5 Activities at LIGO Hanford Observatory (compiled by M. Landry)
Enhanced LIGO officially got underway at LHO this week with a vent of the 4k vertex. The septum bifurcating HAM6 and the remainder of the 4k vertex was
installed. The part had been
transported on-end and thus burst through it's crate, but the FTIR
results came back with all samples clean. Several
scratches had to be ground out with
polishing stones and methanol in order to ensure o-rings made adequate seals. As of early Friday morning, the vertex had been pumped down again and no leaks had been detected after ~14h (~10^-6T).
Highlights from the LHO elog
- with S5 officially ending, LDAS stopped archiving raw data, and the DAQ was reconfigured to remove the high-frequency AS_Q channels,
- a newly purchased chiller producess smaller magnetic fields than the existing Neslab ones
- the results of post-S5 line finding were reported; 12 of 17 lines that were priority outliers in the Powerflux pulsar search of S5 data were identified
Outreach (D. Ingram)
- LHO hosted another in our series of bilingual family open houses on 12/1. Our principal event partner was Yakima Valley/Tri-Cities MESA. Additional support was provided by WSU GEAR UP. Staffing was provided by Raab, Ingram, Terry Santini, Guillermo Rodriguez and Antonio Trevino. Lourdes Melo of Pasco joined us to provide additional interpretation. ~70 guests of all ages from Pasco and Sunnyside participated. A blanket of snow added interest.
LIGO
Livingston Observatory (LLO) and Interferometer
Operations (Giaime)
Enhanced LIGO work (Rusyl Wooley)
- This week, Gary changed out the earthquake stops for ITMX & ITMY. He is also working the disassembly of the mounting frames for the baffles. There is one in each arm. After taken apart, the pieces will be left in the manifolds. We removed the north 84” cover on HAM3 in order to inspect the RM. Visual inspection of the RM suggests that the optic is pitched forward and stuck. On Monday we will go into HAM3 for further inspection. The work in HAM4 is complete and we will be putting the 84” cover back on next week. The beam dump was installed at HAM6. That required removing one of the conflat blanks. It still needs to be reinstalled. Once that is done we will reinstall the 84” cover on HAM6 so I can leak check the annulus space around the new septum plate and also allow us to install the anchor bolts for the seismic work that is coming soon. I received the remaining parts for the rebuild of the vacuum bake oven. Mike completed that air bake of the HAM support tubes. Swipe samples were sent to JPL. The parts have been wrapped and crated.
LIGO computing and network security
(Roddy)
Reported under General
Computing, see below
General computing and LDAS admin
(Giardina)
Reported under General
Computing, see below
Reported under LDAS
System Administration, see below
Data analysis & computing
(Yakushin)
Storage/Condor/LDAS admin:
Reported under LDAS
System Administration, see below
Data analysis:
Reported under Data
Analysis activities, see below
Mechanical and Optical Systems (Coyne)
See Advanced
LIGO
Controls and Data Systems (Bork)
See Advanced
LIGO
40-Meter Interferometer (Weinstein)
- Rana compared the MC_F spectra between H1 and the 40m, and found that our frequency noise is about the same as H1 above 200 Hz, except for the enormous power line spikes. Our acoustics are better and the noise above 1 kHz levels off at the same flat floor (the phase noise of the VCO) as H1. So he's declaring the FSS to be just fine.
- Tobin continues to work on the PSL ISS servo to fix noisy preamps, reduce the noise, and increase the gain. He replaced the short PD cables with longer ones to make it easier to work on the system. He took some RIN spectra and found significantly increased dark noise when the cables and wiring were changed. At higher resolution, nearly all of the excess dark noise on the ISS is in 60 Hz harmonics. With the loop closed the noise floor is 10^-7 RIN or better from 40 Hz to 8 kHz. He's hunting for the source of the increased 60 Hz coupling.
- Rana and Rob are developing all kinds of useful data monitoring functions in matlab into (BLRMS seismic, line monitoring, MCT RFAM, etc), inserting computed channels back EPICS for DAQ logging, and stripchart recording.
- Andrey has securely mounted all six accelerometers to the floor by ITMX and ETMX, and is measuring seismic spectra and coherences.
- Andrey replaced the dead ETMX oplev laser.
- Alberto is designing a board to measure the power of the five RF lines on the mode cleaner transmitted (MCT) light. First he's trying RF filters to isolate each RF line. If that doesn't work well enough, he'll try mixers.
- Bob and Larry are putting in more permanent Cat-6 ethernet cables in the 40m office area, to improve the reliability of our GC network.
- Our weather station channels haven't worked for years; we're looking for someone to put in a new, better system (eg, like LHO's).
- David used the beamscanner to measure the profile, waist, rayleigh range of a test laser, in preparation for doing the same with the 35 watt eLIGO laser.
- Steve sent out the broken rga controller for repair.
Thermal Noise Interferometer (Black)
- Since our last report, we restored the original, horizontal polarization configuration, realigned the cavities, closed the chamber, and pumped out. We are having some difficulty locking the arm cavities, but it is early yet.
- Many thanks to Dennis Coyne and Ken Mailand for helping us with our vacuum-chamber safety issue. Next time we open, we plan to set the bell jar down as is standard procedure at the sites, rather than brace it overhead.
LASTI (Mittleman)
BSC-ISI
- We have finished reinstalling all of the actuators and sensors. Both platforms have been released and balanced and are now suspended at the correct heights. The actuators have been cabled and are currently being tested.
Noise Prototype Quad
- Brett has gotten the suspension to the point that it is now compatible with starting the ISI testing. Both chains are running local damping loops.
CIT Science Group (Weinstein)
______________
Kent Blackburn for the Grid Computing R & D Group:
GRID APPLICATIONS DEVELOPMENT:
- Write agenda and minutes of weekly LIGO-Pegasus telecon.
- Attend weekly LIGO-Pegasus, DASWG, CBC Code development and OSG-USERS telecon.
- Einstein at Home activity:
- Running E@H as standalone application (without BOINC) with Pegasus work-flow planner on OSG sites
- Successfully ran at NERSC_PDSF, CIT_CMS_T2
- Still unsuccessful at AGLT2, UFlorida_PG, UFlorida_IHEPA, and TTU_ANTAEUS
- OSG Production Grid Activities:
- New OSG site authenticating for LIGO this week: Purdue_Physics
- Closed GOC tickets at FIU_PG, CIT_CMS_T2 after gatekeeper patch (for Gridmanager)
- U W Milwaukee: problems after upgrade to OSG 0.8.0, troubleshooting with Brian Moe, Scott Koranda
- Testing WS-GRAM submission testing at UWMilwaukee: in progress LDG (LIGO Data Grid) activities
- Troubleshooting issues on NEMO with Scott Koranda
- Learning basics of Python programming.
OPEN SCIENCE GRID MANAGEMENT:
- Wrote couple of paragraphs for GWIC on cross-disciplinary aspects of LIGO's computing activities for Directorate.
- Wrote a draft document for developing a process to assure a more optimal utilization of OSG resources by Virtual Organizations that satisfies needs of OSG Stakeholders. A VISIO Flowchart was also developed to assist in explaining the steps.
- Worked with USC-ISI on MOU to allow Pegasus developers to access LIGO data and use LIGO Data Grid and the OSG (as a LIGO VO member). The MOU is now signed by the USC-ISI representatives and awaiting signature from the LIGO Directorate.
- Worked on UCSD SOW for year two.
______________
Joseph Betzwieser:
- Preparing for F2F/LSC meeting.
- Crab paper draft review was held and received some comments from reviewers.
- Making corrections to paper based on reviewer comments.
______________
Kipp Cannon:
- Fixed excess power tuning problem (phew).
- Prepared(ing) poster for gwdaw.
______________
Gregory Mendell:
- I have been doing some follow-up tests on some of the CW S5 results, to prepare for the CW F2F meeting next Monday.
______________
Igor Yakushin:
______________
Amber Stuver:
LIGO research
- Continued working on IFO diagnostic scripting and tracking down 'bugs' in the existing code.
SEC activities
- Completed a draft curriculum for use with the gravity well exhibit.
- Helped with docent evaluation.
- Presented Giant Slinky exhibit and gave control room tours to about 50 students.
______________
Pinkesh Patel:
- Preparing talk and paper for GWDAW.
______________
Drew Keppel:
- Preparing talks for LV meeting and GWDAW.
- Babysitting low-mass CBC search jobs.
______________
Kari Hodge:
Laboratory Computing (Anderson)
LDAS Software Systems (Maros)
- A document describing the media forms of the diskcacheAPI was written. It describes both the ASCII and binary forms of the cached data. The process of converting the C++ documentation for the diskcacheAPI from perceps to doxygen has also started.
- System testing of LDAS was done using version 1.9.130 of the software. Most of the systems tests have been integrated into SystemTest.tcl. There were sine gsi security context errors which were not irreproducible.
- Extended testing on ldas-test showed great stability with the staging request removed from the diskcacheAPI.
- Work has started on automating the nightly test results.
LDAS System Administration (Anderson)
Caltech
(Dan Kozak)
- Worked on metadata testing with new 6140 from thumper3 and morbo (2Gb & 4Gb connections).
- Shelf storage ejects at LHO.
- Ingested LHO tapes @ CIT.
- Relabeled tapes at LHO.
- Relabeled tapes, ejected tapes for shelf storage and put new blank tapes in the silo all at CIT.
- Received and ingested last (partially filled) S5 data tapes from LLO & checked with Greg that the gap is filled.
- Load balanced tape drives across FC switch quadrants at CIT.
- Got sendmail working again from opterondata-cit.
- Added across the board -fillvsns option to archiver.cmd everywhere.
- Rebooted ldas-cit to get 8MB maxphys size.
- Asked Scott Koranda about trend pset break vs. archiving metadata in the future.
- Removed all mention of S5 C01 LX in CIT's RLS (these files had been deleted long ago).
- FrChecked all frames on node292.
- Worked with Sun on morbo crashes.
- Worked with Sun on problems with SAM-QFS ssum.
- Answered Shantanu question re: missing data at LLO (the tapes were out of the silo).
- Fixed damaged file at CIT for Jeff Minelli.
- Tape drive called in to Sun (we're still waiting for them to get us one).
- Dealt with water in tape storage area in Powell Booth.
- Helped debug DNS problems at CIT.
- Handed off h(t) data to Greg for gap check.
- Identified some failed h(t) transfers to CIT (Greg is working on this).
- Republished some h(t) files that had failed to transfer to nemo.
- Updated one 3510 with latest firmware.
MIT
(Fred Donovan)
- More kickstart conf on ldas-kickstart; 6,10,18,21,37,41 down.
Livingston
(Igor Yakushin)
- Fixed the problem with LHO's ldbdd server: the new certificate was not where the server expected it.
- Deployed modified version of LSCdqInsert (LSCdqInsert1) at CIT's ldas-pcdev1 and ldas-pcdev2 for Keith to test.
- Finished running the second iteration of rsync on x4500.
- Upgraded dol, framecpp, libmetaio.
Hanford
(Greg Mendell)
- With the end of post-S5 measurements at LHO, LDAS at LHO stopped archive raw S5 at GPS 880920014 seconds = Dec 05 2007 12:00:00 PST = Dec 05 2007 20:00:00 UTC. LDAS at LHO is now running in astrowatch mode, where raw data is only archived for IFO "UP" segments found by conlog, segments entered via the control room "astrowatch" GUI, and 1000 s of raw data every 100000 s, to keep a 1% sample of the raw data. LDAS will continue to archive second and minute trend data for all times.
General Computing (Wallace)
MIT
(Fred)
- Preparing things for the LSC/GWDAW12 meetings.
- Laptop reinstalls (2).
- Added more estat drives to tintagel.
- hdd failure lasti.
- Sporadic network issues (mit dns servers timing out).
- Compiling-internal wiki (systems docs) -twiki on tintagel.
- Misc purch. (refurb inspirion, cables, disks).
- Bit more ilog (javascript/web interface)work.
Livingston
(Dwayne)
- Solidworks activation for a user.
- CIT - VPN installation for a user.
- Installed a WAP in the staging building high-bay area.
- Created an inventory systems account for a new user.
- New mail account for a new hire.
- With Bonnie, made backup of existing and then replaced entire www.ligo-la code.
- Removed a former user from llo-all mailing list at the former users request.
- Working a couple procurement items.
- Setup daily backups of the inventory database.
- Other usual/unusual user support requests.
- Cleared spam trap
Hanford
(Christine)
- Sent an email to several mimedefang mailing lists trying to find a resolution for the mimedefang-multiplexer not working. So far no response at all. Tried re-building and re-installing the mimedefang software, but no change to the problem.
- Moved web page files from apex to jupiter. Configuration changes on jupiter to make jupiter the new web server.
- Wrote up instructions for Mike P. who is visiting to help with a bunch of misc. tasks.
- More support for AdvLIGO contractors working off-site.
- Helped a few more users move to the new mail server.
Caltech
(Christian)
- Riccardo Desalvo - Created full backup of Riccardo’s old laptop. Also, I’ve created a Fusion windows XP image with Solidworks for his new laptop.
- Toner cartridge replacements- 3flr W/B and Albert L. local printer.
- Updated the laptops that are traveling to MIT with the latest security patches and virus definitions.
- Norna Robertson - installed new Matlab network license.
- Other misc.: Continued onsite software/phone support.
(Mike)
- Worked on mounting additional equipment on B/A server room 18.
- Loaded an X2200 with Centos 5 as a webserver to host GWIC.
- Trouble shot a hardware issue on a laptop. I ended up fixing this with a BIOS update and updated the drivers.
- Other misc. user support plus sysadmin tasks.
- Working at LHO with Christine loading Sun workstations with the latest version of Solaris.
(Veronica)
- LIGO: Ongoing support of the PAC meeting. More editing on the Faraday rotator assembly footage; streaming video posted. Bill Kells -- assistance with video playback for his presentation. Addressed an issue of high-res images for an NSF publication. Misc web updates.
- LSC: Ongoing support of the December meeting. Updates of the database of technical papers. Web updates.
- CaJAGWR: Taped and compressed the video of the last seminar. Web updates /user support.
(Melody)
LAAC
- Received positive feedback on the wiki from Nergis. We had a phone conversation and the following are pending tasks for the project:
- Setup certain wiki pages editable by the LAAC committee only.
- Setup a way for grad students and postdocs to create their own pages (editable by the page owner only).
- Organize contents of the wiki Main Page.
- Some changes in the data entry screen for the Thesis Topics table.
- Setup https for the wiki.
(Larry)
- Worked out a number of purchases. Placed orders for some new equipment and working on pricing information for other items. Resolved a licensing contract issue.
- Worked the home account backups. Moved old items to tape, and compressing other old file sets.
- Started work with others on the new gwic web server.
- Some minor trouble shooting on a couple of edge switches. One of the units will need to be replaced.
- Debugging of a PC system. Just some corrupted files that needed to be replaced.
- Resolved a couple of different DCC issues. The capability of adding different formats into files is causing some extra work in conversion to PDF.
- Working on logistical issues related to the different conferences and meetings that are coming up.
- Setup a new account and still going through old ones to get cleaned off the system.
- General end user support and attended a number of meetings.
Advanced LIGO and Supporting R&D (Shoemaker)
Advanced LIGO Management
Advanced LIGO
Systems
From: Dennis Coyne <coyne@ligo.caltech.edu>
PROJECT MANAGEMENT
- Limited release of M070391-00 for comment; an excel spreadsheet and organization chart with all Lab staff and their assignments to in-line, Lab supervisors as well as their matrixed AdL supervisors. General release will be soon.
- Continued to work on resolving issues & priorities with the FY08 budget elements for AdL development (e.g. remaining commitments) and the estimate to complete (ETC) the development. (D. Shoemaker, D. Coyne, P. Fritschel, C. Wilkinson)
Presented the proposed budget to the LIGO Lab Executive Committee and then presented a triage plan to LIGO senior management (deferring some new hires and some intended R&D work). Will issue direction to AdL account managers on work to be deferred or dropped within the next week. (D. Shoemaker, D. Coyne)
- The UK has inquired if Caltech would be able to accept money to purchase penultimate masses (PMs) and end reaction masses (ERMs) in the US if the UK decided to procure from a US company. Beverly Berger (NSF) informed Ed Jasnow that Sandy Scholar (of the OGC, NSF) thought that there should not be any problem with us accepting money from the U.K., purchasing test masses PMs??, and having them installed as Caltech property. She said Sandy wanted to do a bit more research, but that was her initial conclusion. Ed will close the loop with Sandy and inform Dick Seligman of this so he can figure out how to handle the funds.
SYSTEMS ENGINEERING
- Based on further Zemax optical layout work by Mike Smith, he has concluded the horizontal wedge angle for ITMs and ETMs (for both the H1/L1 and H2 interferometers with stable power and signal recycling cavity designs) can indeed be the same (however ~0.4 deg, not .075 deg as previously reported); See the AOS report in this weekly.
- Agreed with SUS (Justin Greenhalgh & Ian Wilmut) on their approach or rationale to meeting reduced minimum frequency requirements for the BS structure. From BS modal tests they conclude that the finite element model is optimistic by 10%. Allowing for this bias gives a first cantilever mode frequency of 82 Hz, which is higher than the minimum frequency, 75 Hz, suggested by ETF test results.
- Plan to have a recycling cavity progress meeting with those working the issues by phone next week. We'll likely follow this with a face-to-face meeting in mid-Jan with the hope of making the decision between stable and marginally stable cavities soon thereafter.
- Processed and approved:
- 2" REO mirrors for IO clean and bake,Traveler E070282-00
- REO mirrors for IO clean and bake,Traveler E070284-00
- ELIGO HAM Accuglass cables,Traveler E070273-00
- SEI HAM parts (2 large crates) ,Traveler E070236-00
- ELIGO HAM SEI Sensor Head & Target Parts,Traveler E070285-01
- ELIGO HAM SEI Actuator Mounts, Traveler E070295-00
- LHO HAM6 septum plate, Traveler E070337-00
Modeling and Simulation
e2e Weekly Meeting
- Mark Barton, Osamu Miyakawa, Raj Pandian participated. Raj is a new adjunct faculty member with SLU physics. His expertise is control and robotics. I introduced Raj to others.
- I discussed the effect of floor correlation with mainly Miyikawa-kun. He has experience in dealing with the floor correlation effect in 40 m.
Static IFO Simulation (Hiro, John)
- John kept working on the resampling code to be used to convert the mirror phase map data to the format to be used in the SIS code.
- Hiro reported some updates to the COC group.
- Updated plot of ITM and RM curvature error:
www.ligo.caltech.edu/~hiro/figs/LossAndThermalDist.pdf
When ITM ROC > 1971 and if I don't adjust the distance between MMT2 and MMT3, the loss is large. The beam size of the field resonating in the Michelson cavity has beam size different from the one in the arm, so the compensation plate cannot reduce this mismatch.
- Ring heater FEM model vs simple curvature change:
Phil gave me the surface distribution calculated using FEM. The difference between this and the simple spherical surface is ~0.1nm. This is much smaller than the typical thermal distortion of 40nm. The aberration rms is 0.3 ~ 0.7nm, but this has short spatial wavelength, so has different effect. So this approximation should be OK.
- When the rms of the aberration changes, the loss in an arm with thermal deformation is proportional to rms^2 www.ligo.caltech.edu/~hiro/figs/LossAndThermalDist.pdf shows some relevant plots, but I did not spend time to digest the meaning.
- Mechelson cavity and the thermal distortion in the arm www.ligo.caltech.edu/~hiro/figs/EScan.pdf is the case for using only one ring heater at ETM, and
www.ligo.caltech.edu/~hiro/figs/IEScan1D.pdf and IEScan2D.pdf are the ones for using 2 RH at ITM and ETM. When 2 ring heaters are used, the beam shape, size and curvature on ITM can stay almost the same as the cold case. When 1 ring heater is used, the beam size can be controlled to the size at the cold state, but the curvature of the beam becomes ~30m larger than the cold state. But this should be able to be compensated by the compensation plate. So, in the lowest oder argument, the beam shape distortion in the arm can be corrected by the ring heater and the compensation plate. But this assumed that the TCS can do with infinite accuracy. More careful study will be needed.
- Comparison of the RF sideband mode stability for marginally stable and stable cavity. I am still working on it - just complicated and takes time ...
Mechanical Simulation for Advanced LIGO (Sany and SLU team)
- Previous AdvLIGO MC e2e analysis we made using LLO’s DAQ ground displacement as input to the seismic isolation model indicates that correlation of ground displacement (between near HAM1 and HAM2) may have some effect on the MC performance. We started to look into the significance of this effect
Prestabilized
Laser
From: Peter King <pking@ligo.caltech.edu>
AdL PSL
- The optical fibres for the amplifier should ship from Hannover next
week.
- I have received quotations for the communications fibres and Ethernet
switches that go between the laser diode enclosure and the PSL rack.
- A draft SOP for the 35-W laser is finished and will be presented for
approval.
Controls and Data Systems
Seismic Isolation
BSC Seismic Isolation Assembly and Test
- All the actuators have been re-inserted and shimmed to level. The GS-13s are back on. The position sensors are on and working (with one position sensor stolen from the 7 for the HAM). The stages are both floating and balanced again.
- With the locks re-set (the start of this most recent tear down) the position sensors are telling us that the locks are aligned well enough to not push the stages more than a couple mils when going from unlocked to locked.
Single Stage HAM Assembly and Test
- Myron, Lee, Corey, and Ken were at HPD this week. The HAM isolation system has been disassembled, crated, and sent for cleaning. All inserts were removed prior to being crated. Stephany provided travelers for all parts.
- The springs were sent to electropolish to remove surface finish left by the EDM process. They were returned on Thursday and sent to LLO for cleaning. This completes the contracts with HPD for both the fabrication and assembly.
- The three large plates for LLO have been precision cleaned and are waiting to be picked up at Astropak.
- A schedule has been done for the assembly and installation of the HAM seismic isolation system at LHO.
- Andy has completed the HAM Seismic Isolation Assembly Procedures and Stephany has written a draft HAM Assembly Hazard Analysis. Both documents are under review by the seismic group.
Suspensions
From: "Greenhalgh, RJS " <J.Greenhalgh@rl.ac.uk>
From: Norna Robertson <nroberts@ligo.caltech.edu>
- OMC-SUS: preparations for cleaning and baking of metal parts continue. Aluminium structure is still undergoing minor reworks. It will undergo brite dip treatment before cleaning and baking. Norna has started some simple modelling and experiments on effect of electronic cabling on isolation. Preliminary observation with a simple pendulum is that the direction of the "dressing" of the cable causes significantly more damping in one direction compared to the orthogonal direction. The "dressing" can be oriented in a way favourable to less damping in the more sensitive direction for the OMC.
- Beamsplitter: started work on rev-02 of the suspension conceptual design document, incorporating updated thermal noise plots from Mark Barton.
- Input modecleaner suspension: started populating the IMC PDR review page on the wiki with relevant documentation, including a note on revised noise requirements for the IMC from Peter F.
- Updated SUS schedule with Janeen.
From: K. mailand kmailand@ligo.caltech.edu
Adv. LIGO
- I have completed a design for an assembly frame and shipping container for the mode cleaner optical bench, for carry on transportation to the site for Sam Waldman.
- I received an aluminum etch cleaning process sample and a Brite Dip process sample for Calum /Janeen re. welded aluminum structure cleaning, Bob Taylor is RGA testing it now.
- I have contacted a third local water jet cutter for the baffle and beam dump black glass cutting they will do a sample part this week.
- Testing the faraday 4 wire style damper is in Phil Willems lab, is in progress.
Core Optics
From: GariLynn Billingsley <Billingsley_G@ligo.caltech.edu>.
- LMA Virgo + Coatings Scheduled now. LMA will coat the largest optics by the end of
2007. We are coordinating sharing characterization data on these large optics.
- Guido and Muzamil have figured out how to calculate the eigenmode inside the recycling cavity. Still need to do some sanity checks. This could help to understand the issues especially the losses caused by modal mismatches much better.
- Hiro and Phil have concluded that the ring heater effect on the front of the test mass is spherical within a fraction of a nanometer.
PATHFINDER
- QED has delivered the small sample optics, 3" and 1" We will check these with the dark field microscope and coat in the next available run.
- ETM Glass type - a recommendation has been made to use Corning 5F or equivalent. See http://docuserv.ligo.caltech.edu/docs/internal/C/C070214-00.pdf
PDR is scheduled for mid January
From: Liyuan Zhang <zhang_l@ligo.caltech.edu>
- The AR reflection measurement has been done two times with one side ( arrow pointed) of the window ESW03, of which the AR coatings on the both sides are made by REO with a technique for Adv. LIGO. While the average is about 30 ppm, there are three more or less permanent defects showing refections up to about 800 ppm. It's also interesting to note that there is some contamination background of several ppm since its pattern changes comparing the two measurements. Further cleaning is underway to get a better result.
Auxiliary Optics
ADLIGO
IFO LAYOUT
- Finally--a choice of wedge angles that works for both the folded and non-folded IFOs. The non-folded IFO requires a BS wedge = 0.9 deg in order to clear the BSAR3 ghost beams at the location of the ITM; and a combined wedge of 0.2+0.2= 0.4 deg for the CP and ITM in order for the output beam and the ITM PO beam to clear the output beam tube. With a little juggling, those wedge angles also work for the folded IFO.
- Mike revised the locations of the errant beam baffles. He is still waiting for definitive numbers for the power and signal recycling cavity lengths to complete the layouts.
HARTMANN TELESCOPE FOR ITMHR
- Aidan and Phil presented a concept for compensating the thermal defocusing of the ITMHR Hartmann telescope. A second reference beam at a different wavelength will be injected colinear with the Hartman sensing beam--the reference beam will reflect from a dichroic mirror immediately after the Hartmann telescope and will sense the thermal distortion caused by the telescope alone; whereas, the Hartmann beam will sense both the telescope distortion and the ITMHR surface distortion. The distorted reference beam will be used to subtract the contribution caused by the telescope.
E-LIGO
INVAC SCATTEROMETER
- The Invac Scatterometer project is on hold until after February, 2008, until a decision will be made about incorporating it into ELIGO.
Input Optics
From: rodica Martin <rmartin@phys.ufl.edu>
UF Team at LLO (Dave, Guido, Kate, Antonio, Muzammil)
- ELIGO Faraday installation.
Muzammil:
- Working on E-LIGO installation. Understanding recycling cavity mode in the coupled cavity of Advanced LIGO. Working on determination of mirror ROC tolerance in stable cavity.
Luke:
- Designed FI aperture inserts & alignment plates (MMT1, SM1, FI).
- Sent LHO FI parts for clean and bake.
- Calculated weight and center of gravity for eligo FI.
Rodica:
- Muzammil and I measured the magnetic field of the ELIGO Faraday magnet for LHO. At the center of the magnet, the axial field is stronger than the one for the ELIGO magnet installed at LLO, providing the proper field for the operation with the Northrop Grumman and IAP crystals.
- Also, measured magnetic field for one magnet ring, to compare the before and after bake data. The bake seem not to have affected the strength of the field for one disk.
For additional
information about this report, contact Albert Lazzarini or Phil Lindquist
