The LIGO Executive Committee Agenda for Monday, April 30, 2007 will be:
(Meeting time: 10:30 am Pacific Time)
1. Announcements
2. Programmatic (Marx)
- Acknowledgement of proposal writing assignments
3. Comments on Weekly Report
4. LSC Issues (Reitze)
5. LIGO Lab Operations
- Administration (Lindquist)
- Sites (Raab, Giaime, Shoemaker)
- Commissioning (Fritschel)
- Optical and Mechanical (Coyne)
- Control and Data Systems (Bork)
- 40m (Weinstein)
- TNI (Libbrecht)
- LASTI (Ottaway)
- Lab computing (
Anderson
)
- Data Analysis Group (Weinstein)
- Instrument Science (Gustafson)
6. Enhancements (Zucker)
7. Advanced LIGO (Shoemaker)
8. Change Control Board/Technical Review Board Session as needed
- Change request CR070002 adjusts the budget to reflect actual hires in the first half of FY 2007 as well as corrections.
Site and other Business Issues:
Special Items:
Special Announcements:
Weekly Report Highlights
LSC Issues (Reitze)
LIGO Laboratory Administration (Lindquist)
STATUS OF LSC MOUs (Lloyd)
- The University of Wisconsin-Milwaukee was signed-off this week with Attachments DAT and Z, and was posted and submitted to the DCC.
PROPERTY MANAGEMENT (Luna)
>From: Rod Luna <rluna@ligo.caltech.edu>
- Prepared a letter to NSF requesting disposition instructions for eight government-owned computers.
- Created a loan document for a File Server to be use at the TAMA project, Japan.
- Revising LIGO's Capital Equipment procedures for LHO and LLO.
- Screened the GSA web site for four pieces of equipment for L. Wallace @ CIT (File Servers).
DOCUMENT CONTROL CENTER (Turner, Mak)
>From: Cleveland Mak <mak_c@ligo.caltech.edu>
- Began searching for cite references of publications we have on file.
- There has been a flurry of past year's publications being submitted over the past week for processing.
- Scanning Update - Progress continues on scanning of all non-electronic "L" category documents on file.
Update to Current Document Management System (Lindquist)
Notes from a meeting held Friday, April 20, 2007.
- J. Giaime has continued his investigation of DocDB. We have permission to use development server. Joe offered to type up and distribute an introduction and instructions.
- DocDB is all open source software that looks to be clearly written. Works with any browser.
- Homework for all - given instructions, try putting documents into DocDB.
FINANCIAL SYSTEMS (Funaro, Brambila, Kaufman)
>From: "Funaro, Catherine" <Catherine.Funaro@caltech.edu>
>From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>
- This is just a reminder to encourage individuals to place orders through TechMart. TechMart punchout suppliers have negotiated special pricing with Caltech and those discounts are not available on verbal or credit card orders. Several purchases were made recently that did not obtain Caltech's discounts since the orders were purchased verbally and paid as invoice-attached. If you would like assistance with TechMart, feel free to call me.
- The revised modification to the University of Michigan has been signed off and completed.
- Triad change orders 183 and 184 have been routed for approvals.
- Two more duplicate requests were discovered on invoice-attached orders. There have been several requests submitted for duplicate payment of invoices the last few months. Duplicate requests for payment of invoices can be avoided by having valid purchase order numbers or credit card reference numbers issued to place the orders. The vendor will then invoice referencing the purchase order or credit card reference number.
- Working on MIT's change for the second half allocation of funds.
- Working on the change order to Galli and Morelli.
>From: Florence Kaufman <fkaufman>
- Submitted two Cost Transfers to balance the Visitors Award.
- Worked on the monthly report for April, which involves many reallocations of budget between tasks and reallocations of expenditures between tasks.
- Submitted a spreadsheet to Project Accounting indicating how the second installment of the FY07 Award should be allocated to the various accounts.
- Prepared an analysis of MIT charges for labor to try to understand the variance between budgeted amounts and expended amounts for the various MIT tasks. Determined that several MIT employees were being charged to different accounts than originally budgeted. A reallocation of budget for these individuals will need to be done, so that performance against budgets can be more meaningfully tracked.
- 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>
- Working with the LLO staff to prepare a Statement of Work and RFQ for the provision of liquid nitrogen. The current contract with Air Liquide expires at the end of May.
>From: Ed Jasnow <jasnow@ligo.caltech.edu>
- Ed Jasnow will be visiting LLO for the purpose of instituting the new property management process.
PROPOSALS and REPORTS (Lindquist)
We received the funding for the second half of the fiscal year for LIGO Operations. We submitted a request for a supplement to cover some travel to the LSC-Virgo meeting.
CHANGE CONTROL/CONTINGENCY MANAGEMENT (Lindquist)
- Change request CR070002 adjusts the budget to reflect actual hires in the first half of FY 2007 as well as corrections. We will discuss this change request during the Excomm Meeting scheduled May 7, 2007.
HUMAN RESOURCES (Akutagawa)
>From: Cindy Akutagawa <cindy@ligo.caltech.edu>
- A Staffing Committee meeting was held on April 23, 2007. The minutes and action items are in progress and when completed will be posted on the SC web page.
- The next Staffing Committee meeting is scheduled for May 14, 2007.
Quality/Safety (Tyler)
>From: Bill Tyler tyler@ligo.caltech.edu
- Participated in the Adanced LIGO NSF dry run for safety this week.
- Continued work to revise and update the two top level LIGO safety documents. Obtained a copy of the revised 2007 edition of ANSI Z136.1, "for Safe Use of Lasers" document. The update of the LIGO laser plan will incorporate the appropriate changes of this new ANSI revision.
LIGO
Hanford
Observatory (LHO) and Interferometer Operations (Raab)
It has been a good week.
The duty cycle (Thu Apr/19 to Wed Apr/25 2007) of H1 was 86.3 percent with typically 15Mpc binary inspiral range, H2 83.4 percent with typically 6.6 Mpc.
Summaries: Range and Duty Cycle update. Tuesday maintenance summary.
Highlights from the LHO elog:
LIGO
Livingston
Observatory (LLO) and Interferometer Operations (Giaime)
S5 Run (Antonio Lucianetti):
- Everything seems to be working well at LLO. During the last week, L1 collected 80.6% science data with binary inspiral range varying between 12 and 14.5 Mpc. Tue 04/24 and Wed 04/25 afternoon the anthropogenic noise in the 1 3 Hz band was relatively high.
- No major technical problems for the L1 IFO, except for Tuesday's maintenance activities. The photon calibrator has been unplugged. Brian found a way to reproduce glitches in the DARM_ERR signal probably due to the LSC front end code.
[J. G.: The glitch occurs when the ETMY_EXC LSC test point is activated on the data viewer. Until the new state vector code (to accommodate the hidden injections) was installed on April 17, this would have pulled us out of science mode. So, we will have to launch an effort to make data quality flags for this new kind of glitch, and we will have to study whether it is possible to make a truly blind injection at LLO. At the moment, it is possible that activating the channel for each blind injection will make a large glitch that is difficult to miss unless we keep that channel on all the time.]
Safety & Security (Rich Riesen):
- Found no site/laser safety concerns this reporting period.
- Working with Bill Tyler on DCC matters, the up coming LLO safety inspection, and LLO related SOP's.
- Assisting Brian and J. Hanson in preparation for clean room work in the staging building lab area.
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)
- IFO commissioning, Electronics, controls, computers:
- Tobin and Valera are commissioning the dither alignment system: Automation scripts being written, code being modified to enable sensing of the IFO lock state. Works for the arms and PRM is being worked on.
- BS / PR / SR optical lever diode lasers were replaced by a single HeNe and a few beamsplitters. HeNe telescope was optimized to maximize the angular sensitivity. There is a factor of about 10 suppression of the error signals at 1 Hz. Along the way we realized that the OL noise was dominated by wind and so we'll investigate acoustic damping of the tables as a summer student project.
- After the heroic efforts of Steve and Valera to make our new PRM/SRM/BS HeNe oplev as good as the old diode lasers (and certainly soon to prove itself better), we can now lock the IFO in the daytime again.
- We are procuring parts (lenses + 1 HeNe) to outfit the ITMs with HeNe oplev lasers.
- Following Rana's suggestion, Tobin and Valera tried using the beam transmitted by the MC2 to damp the eigen mode of the three mirror cavity which is not being sensed by the MCWFS i.e. the one that moves the beam on the MC2 but does not change the cavity waist position or angle relative to the input beam. The signals from the MC2 transmitted quad detector are going to the MC2 oplev screen. We closed the loop by feeding back to the MC2 mirror. Tobin is working on evaluating the loop shape and the noise.
- We are gearing up to vent and drag wipe the test mass optics to try to reduce losses and measure the effects in the noise couplings.
- A campus-wide power outage Monday morning gave Rob and Tobin an opportunity to exercise our coldstart procedures. After a little bit of struggle getting the framebuilder back up, everything came back up. Need to get the framebuilder & RAID array on UPS!
- Our "network appliance" PC died. On advice from Alex, Rob replaced it with a Linksys NAT router, and it seems to work well. The backup of frames and code to the CACR archive needed a restart.
- DC detection:
- Noisy OMC computer was moved away from the AS port, but there was no change in IFO noise. The noise from 100-1000 Hz has a 1/f^2 shape and so we are beginning to measure more actuator noise.
- The near term plan is to continue measuring the laser noise couplings of the DC readout + PRFPMI system.
- Vacuum squeezing:
- Go is writing a paper on the squeezing-enhanced 40m.
- Lab Infrastructure, Bake lab:
- We optimized the Feng Shui of the office space today to optimize the flow of chi. It is hoped that this will help us to understand the DRSE locking signals.
Thermal Noise Interferometer (Black)
- This week we have all been writing, calculating, or planning. Akira is writing up a technical document describing our recent calibration work, and Ilaria is doing design calculations for a thermal noise vs. spot location experiment.
LASTI (Ottaway)
No report
CIT Science Group (Weinstein)
___________________
Eirini Messaritaki:
- I am finishing up coding the null stream test to be used in the inspiral analysis.
- I worked with Vibha on her proposal for her SURF project, which will address the issue of how well the circular inspiral templates can do at detecting gw signals from eccentric inspirals.
- I spent a large amount of time working with people in different LSC groups on the various follow-up tests for the inspiral candidates.
- I am finishing up coding the null stream test to be used in the inspiral analysis.
- I worked with Vibha on her proposal for her SURF project, which will address the issue of how well the circular inspiral templates can do at detecting gw signals from eccentric inspirals.
- I spent a large amount of time working with people in different LSC groups on the various follow-up tests for the inspiral candidates.
___________________
Gregory Mendell:
- I have submitted two abstract for the July 2007 Amaldi meeting, after review by the pulgroup, its reviewers, and P&P. These can be found in the pulgroup's presentations/AmaldiJul07 cvs directory and on the pulgroup's S5 investigations page.
___________________
Igor Yakushin:
___________________
John Zweizig:
This week I have ben trying to resolve inconsistencies between two sets of data quality segments that should be the same, e.g. L1:PD_Overflow and L1:SEVERE_LSC_OVERFLOW+L1:ASI_CORR_OVERFLOW. I have found several problems that contribute to the differences:
- there are a bunch of missing second-trend frames. Since ASI_CORR_OVERFLOW was calculated offline from second trend frames, some segments were not correctly flagged (I'm regenerating these segments from the raw data).
- ASPD5-Triggered segments were vetoed in one case but not the other.
__________________
Kent Blackburn:
OPEN SCIENCE GRID APPLICATION DEVELOPMENT
- Attempt to run full Hipe on OSG UWMilwaukee. Failed, maybe due to a problem at that site. Under investigation.
- Running full Hipe on OSG_LIGO_PSU, no failed jobs yet, looks promising.
- Learned about job data cleanup.
- Started error analysis of failed jobs.
- Read VDS properties documentation.
- Read LSC Inspiral Search Pipline documentation.
- Beginning to become familiar with MONalisa.
- Got OSG TWiki account. Starting familiarization with TWiki.
- Sent weekly agenda for LIGO_PEGASUS telecon.
- Attended LIGO_PGASUS and VDT weekly telecons.
- Attend International Scholars Services orientation.
OPEN SCIENCE GRID VALIDATION TESTBED
- Restarted VTB cluster after power outage.
OPEN SCIENCE GRID INTEGRATION TESTBED
- Worked with Pegasus engineering team completed LSC review for publication of paper "Optimizing Workflow Data Footprint" in the Scientific Programming Journal special issue on Dynamic Computational Workflows: Discovery, Optimization and Scheduling.
- Working with the Globus developers of ws-gram determined that most of the ws-gram testbed sites are able to handle a burst of 500 jobs in a short interval without a problem.
- Installed and configured syslog-ng and began exporting gatekeeper, gridftp and container logs to uchicago repository.
- Attended a special telecom called by Warren at UWMilwaukee related to ws-gram installation at that site.
- Attended DASWG, LIGO-Pegasus and ws-gram telecoms.
OPEN SCIENCE GRID MANAGEMENT
- Contacted new OSG System Administrator to arrange contact time to discussed hiring details.
- Prepared presentation materials for OSG Finance Board Meeting at Fermilab as the chair.
- Attended OSG Finance Board and OSG Executive Board meetings at Fermilab.
- Reviewed partnership agreement with APAC (Australian Grid).
- Reviewed final draft of US Atlas / US CMS Computing and Software Report.
Laboratory Computing (Anderson)
LDAS Software Systems (Maros)
- The diskcacheAPI has been enhanced to prevent observed deadlocks. Two
resource variables have been added to tune performance related to the
deadlock prevention code. The first RWLOCK_INTERVAL_MS specifies the
sleep time in milliseconds between attempts to obtain the lock. The
second variable, RWLOCK_TIMEOUT_MS specifies the maximum time in which
to obtain the lock. If the lock is not obtained, then an exception is
thrown.
- With the diskcacheAPI being busy on the dev system, it has been observed that the managerAPI is rebooting these busy APIs. Debugging code and some patching has been done to try multiple times to connect to the API before rebooting.
The system testing of LDAS was done using version 1.8.519 of the software. Getting lsync to exit cleanly continues to be problematic.
cmonClient and cntlmonAPI have been enhanced to allow looping all tests by calling a test's initializing code fragment when appropriate.
DB2 has been upgraded to 8.2.7 for tandem boxes 3,4, and 5. The value for query_heap_sz on ldas-test has been increased from 1000 to 2000 to fix db2 hanging when it cannot allocate heap memory. Running ok so far. Other systems e.g. dev, cit, were not modified so still running with 1000 value.
- The system ldas-cit has been patched to not reboot an API if API returns a null value on socket. However manager will check API on garbage collection and reboots it if it cannot connect to it right away.
LDAS System Administration (Kozak)
CIT
(Erik A. Espinoza)
- Diagnosed node33 and node34 problems
- Worked on kernel backport from FC5 for FC4
- Rebuilt node163
- Still re-working rpm's for CentOS 5
- Looking into bandwidth problem for outgoing traffic on CentOS 5
- Closed tickets with Sun support over LACP trunk
- Investigating Foundry equivalent config for LACP
- Updated ClamAV on spam filter boxes
- Looked into issue of possible silent dropping of mail w/ large attachments
(Phil Ehrens)
- Ongoing work configuring webserver on betelgeuse. Installed subversion server. Machine is now serving 3 virtual domains.
- Ongoing work on MOU Webforms project. Rewrite of SSI layer to make maintenance simpler. Completed first cgi for processing global data items. Documentation updates to wiki. Directory hierarchy and document naming conv- entions stable. Demo'd current state to Albert.
(Dan Kozak)
- Called in new problem report to get power cable/supply on 9940 drive replaced.
- Continuing to verify md5sums for data on tape to detect bit rot and to allow us to relabel tapes.
- Relabeled 61 L1.2 tapes at CIT for 22TB of free tape space.
- Installed (SAM-)QFS 4.6 on dataserver-cit, ldas-cit & alterf.
- Helped Igor reset the high/low water marks on /archive at LLO
- Tested that old school reader/writer sharing works between QFS 4.5 and 4.6
- Dealt with fallout from power outage at CIT (reset a few tape drives, the silo and restarted LSCdataFindServer on nodes1-10)
- Identified 200 L1 tapes for shelf storage at LHO
- Did big ingest (2 weeks of LHO data + 1 of LLO)
- Got QFS samfsrestore/GNU find/sfind timings with ramdisk mm, 10k RAID 1 mm, 6140 RAID 1 mm, 4.5 vs. 4.6
- Figured out plan for how to lay out V03 h(t) directories on CIT cluster and created the directories.
MIT
(Fred Donovan)
- Begun moving condor from ldas-gridi to node0 - (installing postgres).
Hanford
(Ben Johnson)
- Showed my and Justin's NDS client utilities to Keith Thorne.
- Designing threading+I/O model for NDS server.
- Upgraded SAMFS on gateway and dataservero to 4.6.5. In the process, I fixed the broken mirror on gateway that had existed since the U3 upgrade. The broken mirror caused kernel panic on reboot...
- Ejected and replaced 200 Level 1 RDS data tapes in the library. We now have ~38TB of tape space in the library.
(Greg Mendell)
- As of this report, LDAS is up-to-date with the generation of RDS data and the archiving of raw, trend, and RDS data.
- I am currently working on our tape storage needs for the remainder of S5.
- I am also continuing to work on a new driver script for h(t) generation, and further testing of RDS generation for the next release of LDAS software.
Livingston
(Igor Yakushin)
- At Keith Riles request modified segpagegen script to introduce version 99 of each DQ segment that would combine all the versions of each segment into the complete current version (the current versions are not complete but instead can be considered as patches to the previous versions).
- Rusyl has ordered parts to build power strips for the cluster. The breaker in the existing power strips started failing recently and the custom built ones will have no breaker: the power strips are already plugged into the circuits with much better breakers than the ones used in the power strips.
(Dwayne Giardina)
- Tape eject and shipment to CIT
- Mostly GC this week, again.
General Computing (Wallace)
MIT
(Fred)
- Adding additional wireless access point to LATSI control room;
- Fedora laptop wireless and xorg conf issues;
- Gar disks (both) died (but data already transferred tonova);
- Several purchasing paperwork issues;
- Installed fuzzyocr/spamassassin on ligo-zone backup email server;
Livingston
(Shannon)
- Installed a number of patches on the mail server. Still some to go that will require downtime as they require single user mode and reboots.
- Revisiting the local CA. Set up the machine in the lab & installing updates.
- Spent quite a few hours trying to get smpatch to work on decatur. Evidently there is a bad SSL cert somewhere. I will likely have to open a support case with Sun.
- Set up a new mail alias for local GC sysadmin mail from cron jobs, etc.
- Set up cron tasks on several of the local Sun boxes to keep up with patches in a more timely manner.
- The usual pouring through IDS alerts.
(Dwayne)
- The last round of patches applied to natalia caused kernel panic on boot. I used the FC5 install CD to restore, then mounted the disk image and ran a yum update to retrieve the latest patches including a newer kernel. All is now well.
- Setup the old outreach PCs in the old outreach area. These are to be used this coming weekend, as the new laptops have not been delivered yet.
- Replaced a busted projector in the SEC classroom
- Spent a good bit of time troubleshooting a PC that has been locking up at various times. probably going to build OS on a new HD and install the current HD as a secondary drive so that no data is lost.
- Reset a user account that had been locked
- Spam filter cleanup
- Other usual user requests and support
Hanford
(Christine)
- Set up a new computer with the usual configuration. Moved files from the user's old computer to the new one.
- The tape library is attached to the new server. The server sees it, but the Veritas backup software needs more work.
- Other misc. user support.
CIT
(Veronica)
- LIGO: Most time was devoted to finishing and testing of the new homepage. This is an ongoing project, as there were further changes that we needed to do after going live. Shot 2 hrs worth of video footage for the LASTI installation DVD manual; compressed the first batch into various formats. Edited the clips into continuous segments. Made a test smil presentation to synchronise the video with still images. Capturing the rest of the footage.
- Addressed the issue of high-resolution LLO images for a printed publication.
- Completed the troubleshoot of the new roster database, partially populated it with data. The setup is ready to go live. In the process, found out over the weekend that WebBase stopped running on pherkab and restarted the process.
- LSC: Updates of the database of technical papers. Updates of the LSC website.
(Mike)
- Continued work on moving users over to new Home Account server.
- Working on updating our ip-database.
- User support on SolidWorks & Pdmworks account issues.
- Other user support plus sysadmin tasks.
(Bruce Sears)
- iLog Maintenance: (0.5 days). General iLog maintenance (user adds, keyword adds, systems work, etc.)
(Christian)
- Visitors¹ workstation- replaced old CRT monitor with new 24² LCD monitor.
- Working on building a WSUS server. WSUS is a web-based application that integrates with Windows¹ built in Windows Update client to form a managed patch distribution system for Windows desktops and servers.
- Llaria Taurasi- Installed Mathlab software on Llaria¹s laptop.
- Minor tweaks on the unit in the display case.
- Other misc.: Continued onsite software/phone support.
(Larry)
- Worked a number of purchases this week. Still have a few more to go. Orders for more raid systems from SUN has been placed along with workstations from other companies. Helped Gina resolve a couple of different contract items. Working on replacement of a DOA machine. It should be replaced soon. Delivered a number of items for different groups.
- Assisted Veronica with multiple web related issues.
- Assisted the DCC with a couple of document issues they had in getting some data transferred over.
- Did some troubleshooting on the mailman mailing lists. A couple of scripts quit working. One is definitely functioning properly and the other we will know if it is working correctly at the end of the week.
- Assisted Phil E. with a couple of web server issues that he is working on.
- Assisted various users with different printing problems. The problems were with the documents themselves and needed different tools are some modification to the document to get them to print properly. The latest version of Adobe and Office2007 were the applications having the problems.
- Continue working with PMA on different issues concerning the rehab of the labs and offices they are doing in the building.
- Made some headway on a new mailsever and will be testing the changes over the next few days. If they all work then we will start moving people over to it.
- Working with Rod on different property items. Mainly, documenting things.
- Regular user assistance and account changes.
Advanced LIGO and Supporting R&D (Shoemaker)
Advanced LIGO Systems
Modeling and Simulation
From: Hiroaki Yamamoto hiro@ligo.caltech.edu
e2e weekly meeting
Sany calculated the frequency noise induced by the AdL MC using e2e, and compared with the requirement by PF. Sany tried to get the current noise from L1 data part to be compared to these AdL noise and with the noise predicted using e2e for LIOG I.
Osamu suggested the data port used may not be a proper signal and Osamu sent a suggestion after the meeting.
Although HAM-SAS will not be used as AdL SEI, there is no ISI state space model, so until we get a statespace model of ISI, HAM-SAS state space model will be used for Sany's study.
How to pursue the Lock acquisition design (Matt, Hiro)
When Matt was visiting Caltech last week, how to pursue the lock acquisition strategy of AdL was discussed.
Osamu has a plain to study if the locking strategy used at 40m can be applied for AdL.
Lisa Barsotti (MIT) is going to study how to lock the Michelson cavity with two arms loosely locked to off resonant point by using SPI.
For now, these independent research will be the main activities and these two people (together with any interested party) will exchange their findings when needed.
AdvLIGO LSC/ASC design using FP arm model with quad suspension (Osamu)
I am trying a single arm FP cavity lock acquisition using transmitted light as an error signal. Quality of the transmitted signal is almost equal to the RF error signal. It can lock the cavity even mirror speed is fast and ringing happens, but for too fast speed there is no drastic improvement compared with the RF signal. This is under investigation.
COC (Hiro)
The characterization of mirror surface roughness for the entire spectral range - low figure profile to micro roughness - has been discussed with various people to find a better to specify the polishing requirements of AdL mirrors. One possibility is that a weight function is provided and the polisher calculate the estimated loss by simply multiplying the weight function and PSD the company measured. The weight function can be calculated using FFT. Quantitative estimation how well this works is going to be evaluated soon.
Static IFO simulation (Hiro)
Analytic expressions of thermal effects (surface deformation and thermal lens in materials) for ITM-like mirrors are implemented.
Modeler - e2e simulation engine, ALFI : e2e front end (Hiro, Bruce, Melody)
Bruce and Melody are working together to finish the front and back end of UserDefinedPrimitive module (new module with arbitrary port types and with arbitrary functionalites can be added to e2e without rebuilding the whole program by using UDP).
Sany's group found possible memory leak of e2e simulation engine, and Hiro and Melody are working to find the culprit.
Mechanical Simulation for advanced LIGO (Sany and SLU team)
Continued the e2e modeling of AdvLIGO Input Mode Cleaner. Analyzed the length fluctuation (due to seismic motion ) of AdvMC Input Mode Cleaner computed by our e2e model. As compared with the result of corresponding e2e computation for the LIGO I MC, the MC length fluctuation computed from the frequency fluctuation of the MC transmitted light is smaller by an order of magnitude around 1 Hz and 5 orders of magnitude around 10 Hz. However, it is approaching to the same level as the LIGO 1 case toward 100 Hz. Computed transfer function indicates that the gain of the length sensing control is too high in the frequency higher than 10 Hz. It is possible that this explains the observed high MC length fluctuation at the high frequency end.
CDS Prestabilized Laser
From: Peter King <pking@ligo.caltech.edu>
- I have drafted out a new SOP for the 2-W NPRO based on the new style of SOPs that we are thinking of adopting.
- I have drafted out a new high-gain low-noise amplifier but have not laid out the board yet. This was based on work recently completed at the AEI.
- The flat panel display from Beckhoff Automation has been fixed and returned. I think that we are waiting on return of another component but that shouldn't hold things up. Jay has taken delivery of some other Beckhoff Automation software, which should be the same as that used at LZH (now).
Control and Data Systems
No report
Seismic Isolation
From: David Shoemaker (dhs@ligo.mit.edu)
An evaluation of a "soft" alternative to the Advanced LIGO baseline "stiff" HAM seismic isolation was undertaken, to determine if there were net advantages for adopting the alternative. The timin of a decision now is forced by the schedules for both Advanced LIGO and enhancements to initial LIGO, and limited Lab resources. An evaluation committee, chaired by Fred Raab, looked at the "soft" system and delivered its report (M070061-01).
Based on the current information, I have decided that we will continue with the baseline "stiff" system for Advanced LIGO. For more background and related documents, please see M070057-00.
I want to thank the HAM-SAS team and all those who contributed to this development and evaluation; a lot was learned in a very short time about this technology and more generally how to design, fabricate, and test mechanical elements for Advanced LIGO.
From: Ken Mason kmason@ligo.mit.edu
BSC Seismic Isolation System
Status of BSC Component Cleaning:
- Crate 1 & 2 has been cleaned and returned to MIT
- Crate 4 has been clean and shipped on Tuesday
- Crate 3 has Passed vacuum testing and will be FTIR Tested Wednesday.
- Crate 3 should be shipped on Monday.
- Hardware Crate 1 is currently being baked.
- Hardware Crate 2 should go in an oven Wednesday to begin baking.
- Both Hardware Crates should be shipped on Tuesday next week.
- Actuators are being cleaned at LHO.
- Large parts are in cleaning at Galli & Morelli.
- Position sensors will be back from calibration next week and sent for cleaning.
- Additional cables, cable mounts, and class B tooling remains to be cleaned.
A set of lockers built undersized to allow a Nedox coating was received and sent out for coating. This coating will reduce the coefficient of friction from .6 to .15.
Single Stage HAM Isolation System
Brian Lantz and Ken Mason have completed a document T070088-00 on the status of the single stage ISI. A final design review document on the single stage ham G070156-00 has been issued to the DCC.
HPD is continuing final detailing of the fabrication drawings and assembly documentation. The projected completion date is 5/15/2007.
From: Riccardo DeSalvo desalvo@ligo.caltech.edu
Thursday last week we issued a second and last report on the SAS performance.
"Dennis Coyne wrote:
A second report has been prepared on HAM-SAS for the committee. This report answers the questions posed by the committee and presents a little new information. Unfortunately the team has been plagued by problems not intrinsic to HAM-SAS which has thwarted progress in the past week. You can find the second report here:
http://www.ligo.caltech.edu/~coyne/AL/SEI/HAM_SAS/evaluation/T070087-00.pdf
Dennis"
Yesterday the review committee issued their report.
This morning David Shoemaker informed me that he decided to maintain the ISI and HEPI system as the LIGO baseline.
This does not mean that the SAS project activities are completely terminated.
From now to the end of the summer we will continue acquiring data which we fully expect will confirm that the system actually satisfies the requirements and, in case of necessity, can be used with advantage in either the HAM or BSC chambers.
This is not going to be a sterile exercise.
This data will produce Alberto's thesis, a first class paper, and very useful documentation for the future.
We will document the possible improvement that could satisfy future, more demanding, requirements, as well as precious information for GW interferometers that use the SAS technologies (LCGT, Virgo).
An optical bench system very similar to the HAM SAS optical bench, could be used in any or other high requirement optical experiments.
Last but not least, thanks to your great skills, effort and enthusiasm, although we were the last to get into this game, we were the first, and so far the only ones, to come out with a full scale, Advanced LIGO, in-vacuum, fully functional optical table.
We all know all the little, possibly lethal, traps that we had to overcome, traps that the baseline design still have to fully overcome.
The SAS good performance is already mostly proven and, I am confident that with your continued help it will soon be fully proven.
Until the baseline system has proven its viability, SAS remains a viable seismic pre-attenuation system for Advanced LIGO and could still be called to task.
Getting back to the usual weekly SAS meeting agenda, Alberto has reported temperatures in LASTI in excess of 30C (86F), which effectively cripple the system. In the control room the temperature was even higher and they had to shut down most computers.
With the thermal variation of Young's coefficient of 3x10-4/Celsius it is as having added 3.6 kg of mass on the optical table and 4 on the IP spring box.
Enough to overwhelm even the stepper motors. There is not much he can do until the A/C system is repaired and the temperature returns to more reasonable values.
About the activities over the last week, on Thursday morning we discovered that the excess noise measured in the preceding 2 weeks can probably be imputed to two coil drivers intermittently oscillating between plus and minus 24 V. During oscilloscope inspection the drivers were observed to operate normally, then oscillate, then going normal again in the space of several seconds.
Those coil drivers have immediately been replaced with SUS coil drivers having 1/4 of the authority of the original drivers. The shunt resistances of the SUS coil drivers have been modified to gain back a factor of two.
Calibration of the new coil drivers was hampered by blocked front end computer and other software problems.
When these problems were solved the heat wave hit.
As soon as possible we will resume control development, to demonstrate that the SAS positioning can be maintained within specs, without re-injecting noise in the system.
Then we will repeat all the measurements already attempted while polluted by the oscillating coil driver, to record the actual performance.
Valerio is making a control simulation to evaluate the possible destabilizing e effects of controlling a triple pendulum on the SAS optical bench.
Suspensions
From: Norna Robertson <nroberts@ligo.caltech.edu>
- Finished presentation for Adv LIGO SUS review
- Analysed OMC support structure resonance data and posted report on OMC wiki
- Chaired SWG monthly telecon
- Participated in Adv LIGO UK project management telecon
From: Janeen Romie <janeen@ligo-la.caltech.edu>
Enhanced/Advanced LIGO
- Moved all OMC parts down to room 056 and wiped down with solvent. Weighed a number of sub-assemblies. Moved the resonance test equipment back to room 056. Coordinated with other OMC team members on parts deliveries and parts lists. Started assembly. Working last week with OMCers on finishing up structural resonance testing.
- Participated in more interviews for mechanical engineers for Caltech. Provided feedback to Mike Smith.
- Worked with Norna on internal review slides.
- Submitted periodic summary of US suspension work in support of SWG meeting Friday.
From: k mailand kmailand@ligo.caltech.edu
- The LASTI installation tooling has been assembled and load tested. The mock up of the suspension and frame have been tried with the scale BSC chamber door, and cleared by the dimensions expected.
- A video document has been made describing the operation of each assembly, this needs to be edited, and should ready to be sent to the DCC by 5-4.
- The assemblies are being cleaned and wrapped for shipping to LASTI. The manual lift table and 5 axis fixture will be sent by truck 5-3. There are 4 wood crates total I sent the dimensions and approx. shipping date to Ken Mason
Core Optic
From: Helena Armandula ahelena@ligo.caltech.edu
Advanced LIGO Coatings
LASTI
- The substrate was pre-annealed, as decided, for 8 days successfully. LMA has measured the roughness of side A, were the HR will be done, the roughness is close to 1 angstroms RMS.
- They are still waiting for the coating fixtures, which should arrive soon. Nevertheless, they have done the coating calibration run for the HR coating. Before the end of the week, they expect to complete the calibration for the AR coating.
Auxiliary Optics
From: Michael Smith smith@ligo.caltech.edu
SLC
- I modeled the louver arm cavity baffle in Zemax, and verified the low reflectivity value, <10E-11. I also modeled the baffle in SW, and because of the holes that must be placed in the baffle to clear the main beams, some of the glass louvers get cut out in the middle, which makes the mounting diffucult. I am experimenting with fewer louvers, so that the holes do not totally sever the louver strips.
INTERNAL REVIEW
- Updated the AOS cost figures and technical details. Phil W. and I presented the changes to the Review Committee.
From: Phil Willems willems@ligo.caltech.edu
- This week I prepared for and participated in the Advanced LIGO internal review. Apart from that, I worked with Stefan to incorporate a simple TCS metric into Bench, so that as various interferometer parameters are changed, the rough implications for TCS can be seen. This work is ongoing.
Input Optics
From: David tanner@phys.ufl.edu
Dave Reitze, David Tanner, rest of IO group
- The Preliminary Design Document for the Input Optics of Advanced LIGO was posted to the AdvLIGO WIKI.
Guido Mueller:
- Continued looking into the ASC code for Advanced LIGO
Luke Williams:
- finished my sections of the PDR
- working on DKDP ring heater design
Muzammil Arain:
Wan Wu:
- The optics have been aligned. Working on the software configuration for the phase meter. The first round measurement of the noise associated with the wedged crystal EOM will start soon.
For additional information about this report, contact Albert Lazzarini or Phil Lindquist