Weekly Report for Week Ending May 2, 2002

The LIGO Executive Committee Agenda for Monday  May 6, 2002 will be:

 (Meeting time: 10:30 am Pacific Time)

Open meeting 10:30 - 11:30

1. Announcements
2. LSC Issues (Weiss)
3. Comments on Weekly Report
4. WBS 1 LIGO I Construction (Lindquist)
• Field Change Orders/Contingency Liens/Change Requests
5. WBS 2 LIGO Lab Operations
• Administration (Lindquist)
• Sites (Raab, Coles, Shoemaker, Sanders)
• Detector (Whitcomb, Coyne)
• Campus Research Facilities (Weinstein (40 Meter), Libbrecht (TNI), Zucker(LASTI))
• Data Analysis and Computing (Lazzarini)
6. WBS 3 and 4  Advanced R&D and LIGO II (Sanders)

Special Items:

Special Announcements:

Weekly Report Highlights
 

LSC Issues (Weiss)

Subject: Notes from LSC Executive Meeting April 26

to: LSC executive committee
from: R. Weiss April 28, 2002
concerning: Notes from the LSC Executive Committee meeting April 26, 2002

Data analysis and "upper limit"  group activities (Alan Wiseman)
-----------------------------------------------------------------
An LDAS "boot camp" will be held at the University of
Wisconsin@Milwaukee May 13 and 14. So far about 20
people have registered for the sessions.

A new release of both LDAS and LAL will occur within the
next month.

Most of the upper limit groups will have had separate face/face meetings
by May 12. After these meetings, we will arrange for LSC wide telephone
calls at either weekly or bi-weekly intervals, the rate will be determined
at a meeting of the upper limit group chairs.

TAMA/LIGO/GEO coincidence run proposal (Al Lazzarini)
-----------------------------------------------------
The draft MOU between LIGO and TAMA had been sent to the committee and
comments from committee members were discussed. Three issues
were brought forward. The first involved the use of GEO data in the
coincidence run. In our earlier discussions with Konda we had raised
the question of LSC use of GEO data in coincidence with TAMA and that it
would be best for TAMA to also make an arrangment with GEO. TAMA has
contacted GEO to arrange for this. The second issue is the sub group of
LSC and TAMA people to work together on the data. The concept of the
subgroup has been accepted but the composition of the LSC component needs
to be addressed by the LSC. Finally, it was once again asserted that any
publications arising from this collaboration need to satisfy the publications
policy of the LSC.

Report on the situation in Washington DC  (Gary Sanders)
--------------------------------------------------------
The plan to submit the MRE proposal for advanced LIGO at the end of
2002, for review in January 2003 and a committee defense of the proposal
in early spring of 2003, was discussed at a meeting at the NSF
including Bev Berger and Tom Lucatarto. The idea that LIGO is a
continuing program of improved detectors placed in the existing
facilities has not been forgotten in Washington and we have been
encouraged to go forward. The ambiance for putting substantial
increases into the physical sciences will need
to be improved, however, and we will have to mount a campaign. A useful
direction is to give colloquia at the NSF about the state of LIGO
science, technology and the work on data analysis. Thoughtful
support for the physical sciences at a congressional level might
also be advantageous.

Al Lazzarini reported that the computing resources committee was
contemplating coordination of an ITR 2003 proposal for FTE support
at the various computing centers associated with LIGO. The most
significant need is for people in operations, maintenance and help
desk support.
 

Further discussion of the K. Riles shift proposal
-------------------------------------------------
Keith reports that shift support for S1 is most likely in hand but that
more structure is needed to support S2 and, especially, S3. The Laboratory
has begun including service functions in the MOU with LSC institutions.
Keith is not optimistic and expects that the issue will remain acute.

Committee chairs reports
------------------------
David Shoemaker reported that the planned frequency of the vertical bounce
mode in the advanced LIGO suspensions has been increased from 10 to 12 Hz.

Bruce Allen suggested that we look at the changes being proposed for the role
of ASIS at the next LSC Executive committee meeting.

Next LSC Executive Committee meeting
-------------------------------------
Friday May 31, 2002 at 11AM EDT

LIGO I Construction/LIGO Laboratory Administration (Lindquist)

LIGO Operations--Administration

There was no site teleconference held on Thursday, May 2, 2002.  Instead Project Controls met to discuss the proper assignment of procurements to Equipment or Allocable Supplies, and property accounting (see below.)

The list of current actions revised to reflect the status of open actions assigned through April 18, 2001 may be found at ACTION LIST.

From: Ed Chargois <chargois_e@ligo.caltech.edu>

• Assisted General Computing (L. Wallace) with packing and shipping of two (2) Boxes of Network Boards to the LIGO Livingston Observatory.  Account Number P204401.
• Assisted General Computing (L. Wallace) with packing and shipping of one (1) Box of Network Boards to the LIGO Hanford Observatory.  Account Number P204513.
• Assisted the Detector Group (D.Coyne) with the shipment of one crate, 2' x 2' x 8'  weighing 2000 lbs, and one crate 2' x 2' x 8' weighing 3000 lbs. These crates contain Spring Testers to be delivered to Hytec Inc Los Alamos NM attention: Eric Ponslet.  Account Number LIGO. FAS 1 NSFLIGO.FY02CA.

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

Web pages for the DCC give simple how-to's for document numbering, easy access to the latest on-line documents, and search capabilities for the DCC database. Take a look. . .

ACCOMPLISHMENTS

• No report.

ACTIVITY

• Progress continues on conversion of old financial reports to electronic form.
• Electronic document processing remains steady.
 

05/02/02	Packages	Faxes
In	48	33
Out	12	37

From: Esther Cunningham <esther@ligo.caltech.edu>

Press here for ACCOUNTS PAYABLE HISTORY DATA .

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

• Completed change order #10 to Thomas Staffing, change order #10 to Promec, change order #5 to MLD Technologies, and change order #11 to Dept of Energy.  Processed several employee reimbursements, reduced contracts to $100.00 and removed active encumbrances on new requests to close out one time PO's.  Working on setting up Jani-Kare.
• Sent out the RFQ to four vendors yesterday for the multimedia presentation system for the Hanford Observatory.  Quotes are due back by May 20th.

• Fabrication account has been set-up for Fine Actuation System at Livingston - LIGO.FAS 1 NSFLIGO.FY02CA.
• Revised list of account numbers for Fiscal Year 2002 has been put on the LIGO Internal Bulletin Board.
• Responded to request for funding realignments from Federal Accounting - additional realignments required have been deferred pending approval of second half of the Award from the NSF.

 
• Financial reports can be found at: http://docuserv.ligo.caltech.edu/~fireport

From: irena@ligo.caltech.edu (Irena Petrac)

• REO: CO No.12 for coating of additional LIGO I detector optics was released to Purchasing.

CONSTRUCTION:

• Two change orders have extended the contract for the LLO Staging Building to May 13.  The contractor also has a 20-page punch list to complete.
• The siding for the LHO OSB East Building was delivered on April 29, and the contractor remains on schedule.

• Preparations continue on the sites for the beginning of S1 in July.

SUPPORT (Baldon, Torres, Lloyd, Tischler)

• Processed the paper work for nine (9) new/revised trip, and there are eleven (11) trips in various stages of completion before ticketing can be done and paper work completed.
• Completed eleven (11) Expense Reports, and there are fourteen (14) reports yet to be done.
• Reconciled seventy-one (71) P-Card items this week, which requires phone calls to hotels to track down which traveler incurred which charge and pulling each traveler's file to assure that charges are correct for each airline fee.
• Of the original thirty-eight (38) SURF students traveling either to Caltech, Hanford or Livingston, travel for thrity-three (33) students are completed, and I have five (5) students still being worked out.
• Worked on the preparation and distribution of the Travel/Vacation Itinerary for April 29, 2002.  Performed normal recording and filing associated with Travel and Reimbursement.  Also performed miscellaneous duties as requested by various members of  the LIGO Project here at Caltech as well as from members of the staffs of each of the two (2) sites.
• I continue to do MIT's travel to the sites for installation activities and also to assist them wherever possible.

• Processed the usual flow of invoices for payment, and also tracked and followed up on some invoice problems.  Reviewed and recorded payments processed by Esther the week of April 22. For the total number of incoming invoices received for this period see "Cost Schedule Control Systems" report by Esther Cunningham.
• Processed the usual requisitions and change orders.
• Continue to monitor contract and blanket order encumbrance and notify task managers when supplements are needed.
• Jim continues with data entry in the LIGO database and helping out in the DCC.

• Formatted incoming report from IUCAA (India) and posted on the small web page for review, along with their Attachment A.  Also submitted the report to the DCC as a step toward getting the report onto the LSC page.  Posted a lengthy report from GEO on the small web page for review.
• Obtained price and delivery information on 9 orders for M. Smith while he's away from the office.  Have placed the orders, am now tracking their progress, and then submitting the incoming items to S. Vass.
• Placed several other Pcard orders, and reconciled several more after chasing the documentation.  Updated site trips.
• Arranged teleconferences for: Mechanical course position adjustment, and the LSC Lasers Working Group.
• Changes to LIGO roster this week: Eric McWhorten at Millikan, and Art Hartunian at Wilson House.  Art's name was inadvertently dropped off the roster, it appears again along with his coordinates.

• More shameless promotion of Cinco de Mayo celebration (collection and sign up)
• Gathering rough head count for group photo and working out details of Monday's photo shoot with photographer
• Pre-press kit meeting, Press Kit meeting, Final versions of contact sheet for press kit sent to contacts
• Meeting w/Thomas re: calendar systems
• Meeting w/Division and Compensation for reclassification purposes.

Advanced LIGO (Frey)

Progress Period from 04.19 to 04.25
 

Progress Period from 04.26 to 05.02

Accomplishments:

• Weekly Advanced LIGO Project Controls meeting was not held this week.  Next meeting date has not been scheduled.
• Commissioning Calendar:
• Larry deployed the Calcium Calendar product.
• I imported all the events previously input into the demo version.  Sent out web link and requested comments.
• You can view the calendar at http://arcturus.ligo.caltech.edu/cgi-bin/Calcium37.pl?CalendarName=Default&Op=ShowIt.
• Continued to work with Primavera regarding an outstanding technical issue and received a program patch that I am now using and testing.
• Advanced LIGO MRE Proposal (Highest Priority)
• Continuing the development of the Cost Estimate.
• Continue to pursue all other sub system schedules.  Continue to review all subsystem schedules and incorporating new target dates per DCC Doc. No. LIGO-M020121-A by Dennis Coyne.
• The following is a summary of status by sub system:
• COC - Work on action items per second review continues.  Next meeting date has not been scheduled.
• PSL - Finished inputting changes to the cost book and schedule.  Next meeting date has not been scheduled.
• AOS - Work on action items continues.  Inputting / reviewing data provided by David S.  Next meeting date has not been scheduled.
• IO -  Work on action items continues.  Next meeting date has not been scheduled.
• SUS - Working with SUS group to incorporate current comments.  Executing outstanding action items and preparing revised meeting minutes.
• SEI - Work on action items continues.  Next meeting date has not been scheduled.
• ISC - Continue to review data.
• All other subsystems have yet to be scheduled for their first review.  These dates are pending per direction from Gary Sanders and Dennis Coyne.
• Continue to update the TNI Schedule and incorporate any changes.
• Received data from Eric and will be revising plan to version 3 due to additional efforts to isolate noise.
• Continue to update the LASTI Schedule and incorporate any changes.
• Nothing new to report.
• Project Plan for the 40-Meter Lab Upgrade continues.
• Nothing new to report.
• Cost Book Tool.
• ROSTER DATABASE:
• Continue work on my action items providing BK with needed data.
• Attended gang of 5 meeting this week.
• COST BOOK DATABASE:
• With BK's help, I posted the updated help files.
• DCAA - Work continues on the incurred cost audit.
• Nothing new to report  (All Quiet on the Western Front).
• Development of the Advanced LIGO Project Controls Guidebook continues.
• Project Web Site for posting schedule and progress related data continues to be updated with the latest and greatest.
• See http://www.ligo.caltech.edu/~tfrey/index.html

• Next weekly Advanced LIGO Project Controls meeting to be scheduled.  Per Gary, we will be scheduling a meeting soon.
• Continue effort getting the web based calendar system up and running for the commissioning group.
• Advanced LIGO MRE Proposal (Highest Priority Task)
• Highest priority is the development of the Cost Estimate.
• Will continue to pursue all other sub system schedules.
• PSL - Will complete estimate and schedule changes.
• AOS - Continue inputting changes to and prepare for next meeting TBD. (New data from David to be input).
• IO - Continue inputting changes to and prepare for next meeting TBD.
• SUS - Continue inputting changes to and prepare for next meeting TBD.
• Will update the plan when data is made available.
• SEI - Continue inputting changes and prepare for next meeting TBD.
• COC - Work on action items by Garilynn continues.  Anticipate schedule changes prior to next meeting TBD.
• ISC - Finish review of data.  Input data and change WBS as requested.
• Will issue updated meeting minutes for every subsystem as action items from most recent review are completed.
• Will Continue to update the TNI Schedule and incorporate any changes.
• Will update the plan with progress as of 05.03.02 and  post to site by the 7th.
• Will Continue to update the LASTI Schedule and incorporate any changes.
• Will update the plan with progress as of 05.03.02 and  post to site by the 7th.
• Will continue updating the 40 meter schedule and incorporate any changes.
• Will update the plan with progress as of 05.03.02 and  post to site by the 7th.
• Roster Database
• Will continue to work with BK and executing action items.
Cost Book Tool development continues.  (Highest Priority Task)
• Mapping and formatting of OPS cost data for input will now continue with co-operative agreement approved.
• Will continue to work with BK executing action items.
• Will continue to provide support to PL for DCAA audit(s).
• Will continue the development of the Advanced LIGO Project Web Site.
• Will continue the development of the Advanced LIGO Project Controls Guide Book.

A final draft of the quarterly progress report for the end of February incorporating all suggestions has been distributed for comment.  It's almost time for the next one!

Thursday, May 2, 2002, selected Project Controls personnel met to discuss the proper assignment of expenditure type to LIGO procurements.  This has been complicated by the fact that we have numerous accounts open from various funding sources, and also because many of the old legacy construction accounts, while having "Fabrication" in the description, are not truly Fabrication accounts.  We also switch over this year to the $5000 threshold for equipment.  We must be concerned about how to assure proper assignment in the future as well as how we should treat costs since October 1, 2001 that have been assigned to the wrong type.  I propose to broach the issue during the Executive Committee meeting on Monday.  We should also dust off the old plan to meet with the folks preparing purchase requisitions to make sure that the appropriate account and expenditure type are used.

The following additional change requests have been submitted:
 

We were unable to complete the discussions concerning CR-020006 during the Executive Committee meeting April 29.  Discussion will resume Monday, May 6, 2002.

Press for the latest Contingency Needs Projection.

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

• Various personnel/payroll /HR related work.

Quality/Safety (Tyler)

• No report this week.

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

Summary of Commissioning Activities at LIGO Hanford Observatory (compiled by F. Raab)
-------------------------------------------------------------------------------------
(see elog for details - if it's not in the elog, it didn't happen...)

There has been no progress on locking either the 4k or 2k interferometers, but testing has revealed some clues to what problems we may have. Occasionally we were distracted by 4k input optics - particularly MMT2 - suddenly drifting off into odd alignments over a time scale of 30 minutes and relatively frequent crashes of MY ASC and FE. It is believed that a future software fix will help avoid the crashes. So far no clue on how to exorcise the evil input optics. The possible spurious IFO edge in the 4K IFO was debunked and is now believed to have been a 30-Hz elliptic filter feature in the MC electronics, made visible by a change to damping of the mode-cleaner mirrors. A major realignment was made on the 2k IFO, resulting in improved beam centering in the recycling cavity, but no improvement in locking.

4K IFO Investigations
---------------------
The first major intervention to the 4k IFO to improve locking was a modification to the coil drivers for 4k ETMs. This provided a 3X increase in range at high frequencies (>30Hz), while preserving overall transfer function. This was found not to help with locking, so we began to focus elsewhere. Bill Kells studied how saturation occurs in the 4k ETM drivers. He found saturation typically occurs due to large signals near 340 Hz (violin mode) but that all coils appeared to saturate uniformly. This does not explain reports that a yawing motion is often seen as the interferometer attempts to lock.

A second line of investigation focused on why we should be driving hard on the ETMs. Calibrated single-arm measurements were begun by Rick on the 2K and 4k systems to allow a comparison of the relative amounts of frequency noise on light delivered by the input optics. It was found that the frequency noise was significantly worse on the 4k. This is especially problematical because the 4k IFO is far less able to handle frequency noise by driving on the ETMs. Daniel estimated the residual frequency noise for either IFO in full lock and without the CM servo, and found that there was margin for 2k but that residual frequency noise would be above the acceptance band for the 4k. This alone should be sufficient to make locking unlikely. The dominant contributions were the bounce resonances between 10-20 Hz and line harmonics at 180 and 540 Hz. The line harmonics and other noise above 100 Hz were greatly reduced by modifications to cabling and filtering, leaving the bounce mode as the largest contribution to the total frequency noise. We began working on notching out these resonances to keep them from contributing to frequency noise.

Rana is also checking noise in the 1-arm locks.

Measurements of 4k BSC stack motion in-vacuo were continued in an attempt to understand the largest components of longitudinal motion of the optical tables. This used OSEM sum signals, with a calibration that corrects for the effect of pendulum motion to give optical table motion. Nothing highly anomalous was seen here. The stacks show the 5 resonances expected from the HYTEC modeling and measurement work. The lowest frequency resonances agree with expected amplitudes. Work continues to compare the higher frequency resonances with expected values.

Optical lever noise was evaluated on 4k ITMy by Peter Fritschel, using Doug Cook's optical lever calibrations. It appears to be in agreement with observed fluctuations of arm cavity power. Improvements are expected when Richard, Josh and Rana complete modifications to the optlev servoes that should get this source of fluctuation down to ~1%.

2K IFO Investigations
---------------------
Analog notched white noise injection test of 2k electronics was begun by Josh and Richard. This follows the scheme of an investigation done earlier by Peter and Nergis, but is a more front-to-end test. The analog notched noise was injected into the AS_I whitening board and measured at the coil output DAQ monitors. All notches were seen, but with varying depths. Richard and Josh are now investigating these variations in ongoing work.

Locking on the 2K has been short and typically "glitchy", with the single exception of a single locked section in CM on Sunday evening that lasted over an hour. (There is no known reason why this was different.) There has long been anecdotal evidence that glitching in control signals, particularly MICH_CTRL, preceeded loss of lock in the 2K. (E7 data was also polluted by glitches evident in the control signals, which eventually degraded and caused many lock losses.) Bill Kells started an investigation that was followed up by Stan, Daniel and Paul Schwinberg, looking at large glitches that failed to cause loss of lock. They found that these large glitches correlate with NSPOB going negative! (This is anomalous since NSPOB should be giving a positive-definite indication of sideband power in the recycling cavity.) It was also found that NSPOB fluctuations correlate with frequency noise as measured by MC_F. This will be the subject of further investigation.

Dave Ottaway checked the RFAM on light from the 2K input optics and found it to be near shot noise at frequencies above 250 Hz. At lower frequencies the measurement was hampered by electronics noise. In other measurements, it was also noticed that the MC_F channel shows much larger 1-Hz noise on MC_F compared to data from December. A check of earlier, higher-resolution data shows 30-40X increased 1 Hz motion since a November reference spectrum. Bill Butler is resetting damping gains on the mode cleaner to see if this improves the 1-Hz situation. We will be continuing to compare currently measured levels of frequency noise to past measurements looking for other differences.

One expectation is the 2k locks should hold better when the common-mode servo is operating since this relieves the large drive requirements at the ETMs. However, we have found lately that we are losing lock in most attempts to engage the common mode servo as we make adjustments to zero the mode cleaner offset. This had not been true earlier and we do not know what has prompted the change. In an effort to relieve the symptom until we can figure out how to cure the disease, Mike Landry is making changes in the mode cleaner autolocking script to zero these offests prior to locking the full interferometer.

---------------
Facilities
---------------

The siding for the new building is on site and the contractor installed approximately 10%. The roofing is all done. The contractor is working on the interior walls and electrical rough in. The sprinkler system is complete and tested.  A potential problem came to light today, there is insufficient room in front of several electrical panels on the air handlers. This is against code and it must be fixed.

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

COMMISSIONING IN LIVINGSTON

Noise:

> >After last week's improvements a new noise budget was established for the
> >interferometer. The noise in bands:
> >40 to 80 Hz is currently due to the
> >optical lever damping servos and can be reduced by further low pass
> >digital and an analog filtering.
> >80 to 300 Hz is currently strongly correlated with light frequency
> >fluctuations and should be reduced by further improvements in the
> >common mode servo. New analog filters may be required in the mode
> >cleaner to accomplish the reduction.
> >Above 300Hz is due to photodetector preamplifier and analog to
> >digital conversion noise. The noise can be reduced by increasing the
> >light power incident on the photodetectors. This cannot be done
> >casually since the quadruture signals at the antisymmetric port
> >can be large and saturate the RF amplifiers.
> >We have found that the quadrature signals at the antisymmetric port
> >are, at least in part, due to misalignment. They are reduced
> >by incorporating the wavefront sensor 1 alignment servo. This new
> >information has given added impetus to completing the installation
> >of all the wavefront sensors.
> >
> >Operational improvements:
> >The wavefront sensor 1 alignment servo was again operated succesfully and
> >with the tidal servo we obtained fully recycled locks of several hours
> >duration before needing to reacquire. When well aligned, the acquisition
time
> >at night can be as brief as 1/2 minute.
> >The time domain event monitor software is running and is being used to
> >search for the non-Gaussian breakpoints in the amplitude distribution
> >of the interferometer and the PEM signals.
> >
> >A new pre-mode cleaner with optically contacted components is ready. It
> >has higher reflectivity coatings and should increase the light throughput
> >by about 30%. WFS2 on ISCT1 is being checked using the power recycled
> >Michelson.
> >
> >PSL glitch hunting continues. Glitches in the PSL intensity are still
> >being investigated. It is not possible to see any glitches in the direct
> >PSL output, before any resonant optical cavities. It was noticed that the
> >glitches became more apparent when the intensity stabilization was
> >activated - meaning perhaps that the glitches are always present, just
> >more obvious when the intensity is stabilized. No obvious signs of
> >glitching was present on the master oscillator pump diode current signal
> >when monitored on a oscilloscope.
> >
LDAS:
* Installed SSH upgrade on all Solaris machines.
* Configured metaservers to backup new L?O_BETA databases
* Playing with dataPipeline and slope DSO
 

Laser Safety: Last Friday we held an all-hands meeting
to explain the full system operation and answer people's
questions. The presentation is LIGO-G020221-A-L.  The
Laser Safety Interlock is 'officially' on-line.  We're
still discovering bugs in the logical processes as the
system was received from the vendor, but we are one by
one correcting them and they are appearing less
frequently. Because of this we have yet to enable the
electro-mechanical safety shutters but this is the last
step and we will take it as soon as we are confident
that on false alarm will close a shutter and needlessly
disturb commissioning.  We are planning to install
workstation software on the Operator's PC and allow each
Operator a discrete log-on name and password so that
they may attend to the administrative processes required
to clear an event should one occur on their shift.
Jonathan is traveling this week and Harry Overmeyer and
Gary Traylor volunteered to work with the installer
while he is away in order to begin understanding the
system. (Stapfer/Kern)

Laser and Optics: Ordered and set up several pieces of
new table hardware (calcite polarizers) for Gabi and
Mike Z.  Rai's Scatterometers are completed and working,
but I still have to make and install apodizing stops on
the optical systems. I've got two parallel systems
jammed into the viewport camera cans, but the 6"
viewports are just a little bit smaller than the
combined aperture and clip the entrance pupil ever so
slightly.  This introduces diffraction which can be seen
on the control room monitors. Proper entrance stops will
eliminate this.  I've also designed a fixture that we've
been needing for a long time; that is one which permits
someone to temporarily install a camera or PD rigidly
and safely on a spare viewport.  Ordered the necessary
parts and will make them as time permits. Some time ago
we decided that if and when we ever vent we should take
that opportunity to install additional viewports.  Allen
volunteered to help me with this, and working with
Varian has figured out a way to use the many 10" spare
blank-offs we removed during installation. These will be
reworked as viewports saving a few bucks and expediting
delivery.  These will need to be vacuum prepped so
they'll be ready to go when called for. (Kern)

External Pre-Isolation: I was at CIT the first of this
week to meet with Dennis, Ken Mailand and Larry Jones.
My task is assume responsibility for the hydraulic
actuator for the LIGO Lab so we met and I'm learning the
details of what has been done to date, and what yet
needs to be done.  I am at Stanford for the remainder of
this week to receive the data package from Corwin
Hardham and Brian Lantz and get my hands dirty with the
prototype. (Kern)
 

Detector/Technical Support (Coyne)

40 Meter Interferometer (Weinstein)

• Suspension Controller front end software (Jay Heefner, Rolf Bork, Alex Ivanov, etc): Rolf is working toward installing new Digital Suspension Control (DSC) software on Hanford 4k next week. Alex has Small Optics controller running; in process of modifying code for use at 40m lab. If complete by Friday, may have Ben and Jay install SOS system in 40m lab next week. Alex and Rolf first need to upgrade the 40m DAQ system to accept the DSC (hoping for Friday). If we can't complete Hanford code and 40m code by Friday, will install at 40m lab week after next (May 13).
• Electronics (Ben Abbott):
• The electric shop came by this week and wired up the 1X2 rack which has moved to 1Y3 1/2 (1Y10), and the 1Y3 rack. These will be the main IFO LSC and ASC racks.
• Bob and Ben are wiring the 1Y5 rack (vertex suspension controller front end and mode cleaner suspension back end). Hope to be finished by the end of this week.
• Bob and Ben have started wiring the cross connect on 1Y2 (mode cleaner controls). Hope to be finished by the end of this week or next week.
• Jay and Ben will assemble a Test Plan document to fully test the EPICS controls for 1Y5 and 1Y2.
• Ben has made 5 eurocard slot testers which will be enough to test all of the different types of eurocard wiring quickly and acurately.
• The PSL ISS DC photodiode board came in Monday, and Don has stuffed two of them ready for testing.
• Ben and Osamu will tune the photodiodes we need for the mode cleaner sensing: two RF PDs, two WFS's, and two QPDs.
• The DAQ has been failing; it was flaky from 4/27/02, 1am, through 4/29/02, 3pm. It appears to be failing again, since 5/2/02, noonish. Alex Ivanov believes that it is due to the IBM RAID array disks failing in not-so-obvious ways. Ben has to mail back yet another failed IBM RAID disk. This time it is one of the replacement ones, it is the first replacement that they sent us. This means that the new ones are starting to fail now.
• Optical Layout (Smith):

Mike is on vacation. Dennis and Osamu will begin inventorying all the parts that go into the optical sensing paths for the IO Diagnostics, IMC_R and IMC_T. Almost all the parts are in hand, and the remainder are due in the next week.
• Optics (Billingsley, Armandula): GariLynn and Helena are reviewing the status of our core optics. SRM01 is apparently out of spec, and we need to decide what to do. We await the delivery of the polished test masses from CSIRO, expected this month. Then, all the optics will go out to REO for coating.
• STACIS seismic isolation system (Ugolini): Dennis has inventoried the status of our 4x3 STACIS isolators. Two of them are not functioning (EE-NW reliably oscillates, and SV-NW oscillates whenever an RS232 cable is plugged into the controller (!)). He is in contact with the manufacturer's representative (Rod Horning of TMC). It is likely that they will have to be removed and shipped to the manufacturer for repair. We hope to do this in the next couple of weeks. Meanwhile, Dennis has isolated the aspect of the EPICS readout code that fails occasionally when attempting to read out the status of the STACIS controllers, but has not yet attempted a fix.
• Facilities and vacuum envelope (Vass):
• In the process of replacing our old turbopumps with new turbopumps / dry scroll forepumps, Steve noticed a small but significant leak through V1, the valve that connects the main volume to the main maglev turbopump (an elaborate series of tests narrowed the problem to this one valve). It apparently has been there since our last vent, 2 weeks ago. It is not a problem during regular operation, because V1 is open then. It's also not a big problem when we're vented. Nonetheless, Steve will explore options for fixing or replacing the valve.
• Steve has replaced several of our old gauges (CC1, CC2, P1, P2, PTP1) with new ones.
• The optical table enclosure for the AP table has been delivered to us and Larry will assemble it next week. We will not, however, get the beam tubes from the shop for another 2-3 weeks.
• The 8" adjustable bellows on our 13 meter mode cleaner beam tube has one or more bent rods. We await delivery of stiffener sleeves from the shop; still some weeks away.
• Alarms on the two end doors to the lab finally are wired to ring at Security, in compliance with recommendations from the safety audit.
• Camera mounts are in the shop and should be ready in a week or 2.
• The Caltech AC guys tell us that they will deliver an estimate for the work required to improving the AC in our new control room, by May 6.
• South Annex Bake Ovens (Taylor, Cardenas):
• All (4) baking ovens are ready.
• Dynamic Light Control in-vacuum mirror mounts are being prepared for baking.
• There are more parts to be cleaned and baked from Janeen Romie.
• The optical port flanges, and BK7 optical port windows, have all been baked and are ready for installation.
• Dynamic Light Control in-vacuum mirror mounts are being prepared for baking.
• Bob asks that any/all requests for cleaning and/or bake jobs be accompanied by paperwork, based on E960022-A, pages 20-21.

Thermal Noise Interferometer (Libbrecht)

This week we built, tested, and installed a second set of notch filters
and locked both arms simultaneously. We can now achieve full lock during
the day, even when the MINOS crew is using the crane, with acquisition
times of a few minutes. However, holding lock in a noisy environment is
another matter!  Hold times appear to be alignment dependent, and we are
currently tweaking the alignment of all three cavities to maximize our
duty cycle.

The North Cavity, with its new photodetector and notch filters, works
wonderfully. It acquires quickly and holds lock for an hour or more, and
its noise level is about a factor of 3 higher than our best curve in the

South Cavity.

The South Cavity also acquires quickly, but tends to fall out of lock after
about five minutes. Moreover, its noise floor has come up by a factor of
3 and is now comparable to the North Cavity's. We are now looking at
various noise sources to try and improve the sensitivity in both cavities.

LASTI (Zucker)

LASTI (Abbott, MacInnis, Mageswaran, Mason, Mittleman, Ottaway,
Rollins, Shoemaker, Zucker)
=======================================================================

VACUUM ENVELOPE:
 
Myron closed up and pumped down after the recent round of stack
impedance measurements wound up last week.
A soft LN2 dewar caused a seal gas shortage early this week,
triggering a pump shutdown.  Safety systems performed nominally
(i.e., the gate valve shut!), but it got us thinking that this is no
way to live. Myron has spec'd out a fixed air filter/dryer
system to provide a more reliable source of seal gas for the main
forepumps. We also decided to add another relay contact to the
interlock system so shutdowns like this will be less stressful
on our turbo.

EXTERNAL PRE-ISOLATORS:

Rich continues to analyze the volumes of data taken in the stack
characterization test.  We've discovered at least two of the
21 sensor channels were not behaving correctly,
but it isn't yet clear whether there's sufficient redundancy to ignore
them or if we will have to go back inside and repeat some measurements.

Ken designed a coarse positioning addition to the EPI support structure,
plus
a kinematic adjustment system for centering and thrustline alignment of the
MEPI actuator. These were reviewed and approved for detailing and fabrication.
Fabrication on the main weldments is proceeding on schedule, despite
buyout of
one of the main contractors (by a losing bidder, as it happens!)

Myron is working on a HAM installation fixture concept employing
precision
screwjacks and electronic dial indicators for position repeatability.

On the EPI electronics front, Rich Abbott reports:

1.  Mohana has finished the schematic of the rack mount portion of the
seismic retrofit electronics.  PCB layout will begin shortly.

2.  The field interface board for the L4C and Inductive position sensor
is
complete and being sent to the board house.  Chassis is on order for the
field unit.

3.  Pump servo conceptual design is well underway.  Will finish the
conceptual design 3 May 2002

PSL:

Jamie is working on intensity noise characterization of the PSL.  Also
spec'd out a custom EO modulator from New Focus
with angle cut ends and AR V-coatings to improve optical isolation.

Data Analysis and Computing (Lazzarini)

Simulation and Modeling (Bhawal)
New release schedule
----------------------
(Hiro)
Next major release of the e2e package is scheduled next week.

The simulation engine of this package is greatly revamped, with new and improved
features as well as bug fixes. This is necessary to run the next major release of
LIGO simulation.

Another major change is that a JAVA-based alfi5 is the default GUI front-end,
instead of alfi4 written in C++. alfi5 is used internally, and is quite stable.

This will come with several revised documents, and the installation process
will be simplified.

LIGO I simulation system
--------------------------
(Matt) Locked SimLIGO and produced preliminary noise curve (includes
seismic noise, shot noise, and many technical noises).
Next step is to add the common mode servo and frequency noise.

Validation of Full IFO run with mode mismatches
------------------------------------------------
(Biplab, Matt, Hiro)
The Han2k model is modified to have an IFO of length 139 meter. Our aim is to
reduce the build-up time so that a model that uses only primitive modules
(and so runs slowly but gives accurate results) can be run for shorter duration
to get locked state results and can be compared with model that uses summation cavity.
Changed gain parameters appropriately to lock the model.

For a case which considers as-built differences in arm mirrors and some amount
of thermal lensing as well, some differences between primitive and summation runs
are found in a mirror position and in power at some points.

Code development and maintenance
---------------------------------
(Biplab) Committed several recent changes to CVS.
Updated primitive reference document.

(Ed Maros) worked on build-e2e script to simplify building of e2e package for
end users.

Alfi
-----
(Bruce) Out sick 2 days.
- Completed reimplementation of connections in Alfi5.
- Misc. problem report bug fixes.

(Melody)
-Fixed more problem reports for alfi5.
-Updating the 'ALFI5 Tips and Shortcuts' document to include the latest enhancements.

LIGO Data Analysis System

Software Systems (Blackburn)

The first beta release of LDAS (0.2.0) made it out of Millikan this
week. It is now running on all LIGO LDAS systems (except the LDAS-DEV
system which is already developing towards the next releas). In
addition, this release of LDAS is running on the UWM cluster and
being used by the LSC. This release was tested in conjunction with
a new release of LAL and LALwrapper. Many of the search code authors
participated in this joint endeavor and greatly improved the final
product. This is a major milestone for the LDAS software and many
thanks and congratulations are in order to allthose that helped make
it possible. There will be one more release of LDAS in preparation
for the Science Run.

As part of the new release of LDAS, all LIGO LDAS systems had their
various counters reset to one, job and log file directories cleaned
out, and a new database created.

One of the most enlightening aspects of the testing that went into
this release of LDAS was the discovery of several issues with the
structure used to store detector geometry in the frames and the
handling of this within LDAS. It was discovered that the latitude
and longitude values were reversed in the Hanford and Livingston
frames, an artifact which exists within the E7 frames. A "fix" to
this was added to LDAS so that it could correctly pass along these
values to downstream code such as the DSO search codes. It was also
discovered that all frames had the detector geometry labeled the
same and that one of the azimuth angles were incorrect. There was
not enough time to resolve these in the release. But the framebuilder
has subsequently been fixed to provide correct values for all these
attributes.

Lazzarini note: We are now working to amend the specification to correct the shortcomings. This will involve an iteration with Virgo.

A lot of effort went into improving the performance of LDAS as well
as the reliability for this release. We are optimistic that we will
see a higher percentage of jobs complete successfully than was
encountered in the E7 run. We also worked to improve the performance
of the new diskCacheAPI by two orders of magnitude between the pre-
release versions and the final release of LDAS. It has also been
reported by Greg Mendell that the Periodic search code used to
generate Short Fourier Transforms (SFTs) is running between 1.5 and
2.0 times faster than it did in the E7 run.

Another significant new feature in this release is the ability of
LDAS to generate reduced data sets in Processed Frame format. This
functionality has been demonstrated to work and the University of
Oregon team has participated in testing it. There are a couple of
issues that should be addressed in the next release of LDAS which
will make these reduced data objects more useful. However, one of
the major concerns will need a modification in the Frame Spec to
fully correct.

Hardware Systems (Anderson)

Caltech
-------
(Dan Kozak)

* Continued HPSS migration from Redwoods to 9940s (stopped 3590 work for
  the moment as per James Patton's instructions), HPSS user directory
  reconfiguration (moving towards no data in user home directories) and
  account maintenance (mostly retiring accounts).

* Still working to get StorageTek to make good on replacing the Ultra 10.

* LIGO SAN testbed:

    Stress testing SAM-QFS, filled disk space and ran it out of
    tapes and it failed gracefully.  Successfully built new
    filesystem using existing .inodes file.  Now testing other
    failure modes and disaster recovery mechanisms.

(Al Wilson)

* Compiled a test version of aide (tripwire) for Linux testing on m22.
* Set up system for new hire Eric McWhorter - Welcome Aboard!
* Troubleshooting the differences between cfdef4 and ver 5, have reached a
  dead end. additional input needed.
* Revisited the Kickstart setup with the latest version of Red Hat.

(Stuart Anderson)

* Helped manage the LDAS-0.2.0 software release.
* Attended the Teragrid meeting at Argonne.
* Finished activating zlib security patch on all LDAS Solaris servers
  at Caltech.
* Brought new datacon server on-line in the LDAS-CIT system.

MIT
---
(Keith Bayer)
* Installed ssh (zlib) patch on solaris boxes.
* Ran cable from ldas lab to highbay control room.
* Acquired wall boxes to punch down cable.
* Moved lancelot DMT machine to ldas for conference.
* Loaded SRDS data onto T3s.

Livingston
----------
(Igor Yakushin)
* Installed zlib security patch on all Solaris machines.
* Configured metaservers to backup new LLO_BETA databases.
* Playing with dataPipeline and slope DSO.

Hanford
-------
(Greg Mendell)

* Applied the zlib security patch in 112611-01.zip on all Sun boxes on
  the LDAS network at LHO.  (Reboot of these was done with the new release
  of LDAS.)
* Assisted with the release of the new 0.2.0 version of LDAS at LHO.
* Worked with Dave Barker to check that the frame header/detector
  structures are now correct.  In general, we are discussing various
  issues to prepare for E8 and S1.

Lazzarini:
Lazzarini and Anderson represented LIGO Lab. at an applications workshop for the NSF Teragrid program. The meeting was informative in that we came away with a much better awareness of the Teragrid plans and timelines. The program is prototyping new 64 bit intel hardware at each of four sites and LIGO will likely be invited to participate in initial activities to develop working data analysis codes for teragrid. A simple, productive approach appears to be to port the Hough transform paradigm. To this end, in preparation for the meeting GEO principals developing the Hough code contributed information on its implementation and how it might fit into a Teragrid computing model. In addition, it appears that, through NCSA, it may be possible to obtain FTE support in porting the code to the new architecture.

Data Analysis Activities (Lazzarini)
Mendell:
1) Worked with LDAS at Caltech to assist with the debugging of the
reading of frequency series data from the frame proc structure.  This
was not entirely successful, and more work will be needed to get this to
work before the June release.

2) Started regenerating E7 SFTs at LHO and LLO using the corrected clean
locked segments.  A new bug (PR 1534 submitted by Peter Shawhan) in
which processing of a job begins before a file is transferred from a
remote site has caused some jobs run at LLO to fail when submitted by a
script running at LHO.  I am currently working to get around this.

3) Working on an update of the SFT specification, and preparing for
travel to Milwaukee May 13-17 to work on the knownpulsardemod DSO.

Shawhan: Preparing to travel to UWM for the inspiral upper limit meeting
Lazzarini; Ditto for UTB and stochastic background meeting

General Computing (Wallace)
MIT:
(Keith)
-Activated wall jacks in NW22 rooms
-Working on ghostscript filter converter for inkjet printer
-Received 2 SB1000's for virtual control room
-Packed and moved some equipment to NW22
-Installed 2nd hdd in sb100 for system backups
 

Livingston:
Nothing to report at this time.
The sysadmin will be out for a few days. He had a little incident with a
nail-gun at home.
http://www.ligo-la.caltech.edu/~sroddy/xray1.png
 

Hanford:
(Christine)
- Installed fast ethernet into some of the offices.
- User support for pcard software problems.
- Continued setting up new PCs and cleaning off files from old PCs.
- Continued with inventory of software and hardware on site.
(Larry)
- Had another meeting with NoaNet concerning the WAN connection at the Hanford
Observatory. This time Albert was able to attend. A couple of different
connection options are being investigated by NoaNet. We should have more
information by the end of the month.
-Going over the network statistics and information that Christine generated.
The
T1 line is definitely not enough bandwidth.

CIT:
(Mike)
-Loaded two PC's for visitor's workstations that included full reloads with
Operating System and General Computing software.
-Setup an office for a visitor workstation that needed a PC, in place of
the Sun workstation.
-Check the following documentation on the internal web.
http://docuserv.ligo.caltech.edu/docuserv/computing/win_y2k.html
This is to insure that users who are loading their own computers will
follow these few guide lines to help make sure our Network will not go down
due to Master Browser Elections and to keep your computer from trying to
register your address to the DNS table. If anyone would like me to back up
their Laptop or Computer by getting a Ghost Image, please contact the
sysadmin group and we will make the necessary arraignments to work this
into our schedule.
-Finished up loading and creating Ghost Images of two laptops and have
them back into the loaner pool.
-Started loading another laptop but still have GC software to load.
-Showed Veronica and Erica how to used VRVS to prepare them for a LIGO
Seminar this Friday 5-02-02.
-Started loading a New PC for Wilson House User.
-Onsite User Support,
This included some hardware failures, software issues, networking problems
that were connectivity issues.

(Lisa)
- Began building an independent test string so that I can test changes to
mail,
web servers, new versions of dns, etc., without using the production
environment.  In addition to creating a good testing environment, this
information will also provide a procedure for doing a full disaster recovery
of
sirius, acrux and ligo.
- After some extensive testing, I made changes to the way spam & virus email
is
blocked at the mail server.  Noticed some anomalies with triadpm.com trying to
route mail through acrux.
- The usual round of new accounts, mail aliases, etc.
(Veronica)
- LIGO website: Working on the Press Kit website. Met with Linda and Ryan
on the status of the press kit, both the online version and the handout.
Discussed with Linda the need to implement a document management tool.
Linda offered to contact an independent assessment contractor, to
determine what software best to be used for this.
Posted various updates to the LIGO website (Fellowships, Elba Conference
webpages, MOUs, Resreach Bulletin Boards).
Worked with Mike and Larry on the VRVS use for the upcoming LIGO seminars.
- CaJAGWR: updated the seminars listing.

(Larry)
-Working a number of procurement items. Purchases for 40M, LDAS and a few
items
for GC. Working on upgrading the video switch in the server room.
-Worked with Mike and others on setting up the CIT Control room. Testing of
the
system will be in the Small Conference Room, that room is now reserved for the
next three months for that purpose.
-Reviewed some of the computer audit procedures that Caltech performs. These
will be checked out at MIT and the Observatories over the next few months.
-Worked with Mike and others on setting up the VRVS for the upcoming
conferences.
-Reworked the computer room. Presently, there is no more room for more
computers. Also, will be purchasing another UPS to handle a couple of the new
servers.
-Working with Thomas F. on a new calendar tool. The tool is called Calcium and
appears to be platform independent.

Lazzarini;
Wallace and Lazzarini held a teleconference with representatives of Washington State's NoaNet telecommunications organization. Discussion was what upgrade paths exist for LHO to move beyond T1, their relative merits and costs. Next step is to arrange a 3-way meeting among LIGO, NoaNet, and PNNL/DOE. Tentative date for this meeting is 31 May.

LIGO II/Advanced R&D (Sanders)

Minutes of telecon May 14 th 2002:
participants: morning call: Jesper Munch, Maik Frede, Martina Brendel, Ralf
Wilhelm,Carsten Fallnich, Benno
, evening call: David Shoemaker, Shally, Ralf, Martina, Rene, Benno
1) updates
Adelaide:
- decision was made to buy new fibres
- laser head is together, resonator aligned, expect lasing experiments to start tomorrow
- interferogram shows straight fringes (maybe small positive horizontal lens which should
not be a problem) up to pump powers of 100W
- new jig designed for laser head assembly
- 10W system performs well, first lasing experiments yield 13W in multimode operation
for 40W pump power

LZH
- started to include depolarization in modelling effort, first test will be to try to describe the
saturation of a test set up for the 20W class front end (GEOtype laser with undoped end
cap rods)
- first test with a high power rod pumped through both end faces with 125W (250W pump
power together) gave 65W output power with an M 2 between 5-7, next step is to insert
Faraday rotator into the standing wave cavity to try to reduce depolarization effects and
improve spatial profile and output power
- experiments to spatially homogenize the beam behind a bundle of fibres with a quarz rod
of 5cm length show very good results, it is planned to use such a homogenizer to pump
the high power stage
Stanford

- power supply for Lightwave 20W amplifier repaired
- single passing this amplifier with 4.5W out of the LIGO type laser as an input gave 20W
output
- first Stanford amplifier head is aligned and Shally will start experiments with that head
today: goal is to get about 40W for 180W pump power
- after a characterization of that beam he plans to inject it into the second Stanford head to
get about 100W
next conference call: June 6th

From: Mark Barton <mbarton@ligo.caltech.edu>

This week I worked with Phil Willems to do some detailed validation of
the thermal noise predictions of my Mathematica model. We found one
embarrassing error common to the quad, triple and toy models: I had mixed
up the tags specifying the damping, so that wire bending elasticity was
having longitudinal damping attributed to it and vice versa. Once that
was corrected, we found that for each degree of freedom in a one-mass,
four-wire toy model, the thermal noise predicted from the model agrees
very closely with a very simple analytic prediction using the fluctuation
dissipation theorem for a one-dimensional mass-spring system with obvious
substitutions for mass, elasticity and damping. We also looked at a quad
system similar to the MIT prototype except with silica fibres at the
lowest level and found that the thermal noise was very large at low
frequencies, but asymptoted very quickly to exactly the thermal noise
that would be expected from considering the last stage alone. I've posted
the updated v2.2 model used for these tests on my models page (<http://
www.ligo.caltech.edu/~mbarton/SUSmodels/asus4/>) along with a Mathematica
notebook with just the thermal noise results <http://
www.ligo.caltech.edu/~mbarton/SUSmodels/asus4/ThermalNoiseTest.nb>.

From: ctorrie <ctorrie@ligo.caltech.edu>
Advanced LIGO Suspensions

On Monday Janeen and I held a review of the drawings and ideas for the Mode Cleaner Prototypes for LASTi. Norna, Phil, Mark, Larry, Dennis, Ken and David Tanner and Dave Reitze from Florida contributed  comments and suggestions.

For the rest of Monday and Tuesday I worked with Larry Jones discussing in more detail some of the ideas from the drawing review.

On Wednesday 1st of May I leave for Scotland and the Institute at Glasgow University. My next weekly report, for 3 weeks, will be on the 22nd of May.

The various parts I have in workshop, prototype parts for the MC suspension, should be ready for my
return. Some of these will be shipped to me in Glasgow by Janeen.
 

From: Janeen Romie <romie_j@ligo.caltech.edu>

AdLIGO Suspensions
Held a drawing review for the MC suspension so far. This was in preparation for Calum's trip to Glasgow today. David Tanner and Dave Reitze brought up some issues that Phil W. addressed. The MC optic is 15cm dia x 7.5 cm thick. As designed, the optical aperature is not obstructed. No comments on Phil's MC reaction chain (or lack thereof) paper so far.
Larry W. is putting all of Calum and my Solidworks and AutoCAD files in one location on sirius so we can access them together without confusion.

Working with Norna on the RM layout.

From: Riccardo DeSalvo <desalvo@ligo.caltech.edu>

Michael, Hareem
 

More trouble with cryostat’s vacuum. Waiting for replacement electronic
board for cryostat to control valves.  Will test it asap.
 

Michael
 

Mapping the cryostat measurement setup, preparing for thermal
capacitance measurements.
 

Hareem
 

Old braze found polluted by oxyde, re-purified gold from braze, made new
batch (Au71Sn19)99Ti1.  Will test it next week.
Ordered some AgSnTi braze from commercial source.
 

Aso
 

Calculating folded pendulum suspension thermal noise with analytical
formula.  Parameters to be introduced, then check validity.
Eventually will repeat exercise with MSE II and cross check.
 

Kelin
 

Molded several MoRuB samples into ribbons, prepared several beads for
levitation and splatting, received replacement splatter ceramic sample
supports.  Ready to test splatting again.
Studying thermal capacitance theory of samples.
 

Akiteru
 

The cavity is still largely misaligned. I am implementing
another feedback using the suspension platform actuators, which I did
not do because I was not very sure of their reliability, but it was a
stupid
attitude. Let's see how it goes... The problem is that the initial
alignment of the cavity was much more difficult than I expected. In any
case, I hope to send you 'real' good news soon.
 

Ric
 

Pushing papers.
Collected the comments of the final draft and forwarded to NIM the two
sensor and actuator papers.
Paper pipeline:  IP measurements (Szabi),  MGASF measurements
(Virginio), MGASF simulations (Virginio, Giancarlo), Horizontal
accelerometer (Alessandro), 3 m hyerarchical controls (Akiteru), AID
remedial option (Virginio, Szabi), SAS pre-isolator remedial option
(Riccardo).
Set a target/deadline of end of May for the first 4 papers.  Akiteru’s
paper(s) have an automatic deadline given by the defence of  his thesis,
the other papers will come later.

For additional information about this report, contact sanders@ligo.caltech.edu