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The LIGO Executive Committee
Agenda for Monday April 17, 2000 will be:
(Meeting time: 10:30 am Pacific Time)
Open meeting 10:30 - 11:30
Special Items:
LSC Access to engineering data:
Keith Riles, chair of the LSC Detector Characterization group, has
written a letter to Barry that is a template for LSC groups to gain
access
to the engineering data. The letter will be posted on the net and includes:
the work to be done on the data, the demands to be placed on Laboratory
hardware and people, and the names of the people working on the data
with
their responsibilities.
People in the Laboratory working on the engineering
data will also be
asked to give corresponding information to
Barry. This too will be posted
as a way for the entire collaboration to maintain knowledge of
what is being done.
Organization of the LSC software development:
A mechanism for tighter coupling between the LSC and those in the Lab
responsible for the LDAS are the "Mock Data Challenges". The LSC data
analysis committee chairs are being asked to organize the software
development in their groups to synchronize with these activities.
WBS 1.2 LIGO Operations--Administration
From: Ed Chargois <chargois_e@ligo.caltech.edu>
Assisted the Detector Group (M. Fine) with the packing and shipping of two boxes of hardware to Astro Pak (B. Ekstrand), Downey, CA. Account Number P96916.
Assisted the Quality Assurance Manager (B. Tyler) with arranging transportation for previously loaned equipment to Walker & Sons being returned to LIGO, Pasadena. Account Number LIGO.5F500 2.2 NSFLIGO.5F5000.
Assisted the Systems Administrator (L.Wallace) with shipping of a Gateway Computer to the LIGO Livingston Observatory (T. Evans) via UPS. Account Number LIGO.5N.500 2.13 NSFLIGO. 5N5000.
Assisted the LIGO Livingston Bakeout / Vacuum Manager with arranging transportation for four (4) Transformers being returned to the LIGO Hanford Observatory (M. Lubinski) via United Motor Freight.
From: Cleveland Mak <mak_c@ligo.caltech.edu>
| Packages | Faxes | |
| In | 35 | 29 |
| Out | 16 | 45 |
Special Projects: Processed fairly high volume of electronic docs. Began working on PSI electronic drawings.
From: Esther Cunningham <esther@ligo.caltech.edu>
Press here for ACCOUNTS PAYABLE HISTORY DATA.
From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>
There was a meeting held on Monday, April 10th, attended by various Acquisitions and LIGO personnel regarding concern of the Oracle printouts. The consensus was that we would send out a brief one-page form on change order modifications to new subcontracts rather than mailing the P.O. printout from Oracle. The purpose of the new form is to reduce creating confusion on the part of the supplier as the new form is very brief while the Oracle P.O. can get very lengthy as it includes prior change orders and cancellations of lines. An exception would be made for some existing subcontracts where the vendor is familiar with the Oracle form and it would be best to continue sending them the Oracle form.
Right now, I am working on Galli and Morelli where it looks like we will try to put through the change order funds on an old poeta (FY 1997 funds) rather than a current poeta as a test to see if this can be done in Oracle.
From: Florence Kaufman <fkaufman@ligo.caltech.edu>
For a listing of the FY 2000 POETA Accounts see
http://docuserv.ligo.caltech.edu/docuserv/home/accts_ops.pdf
http://docuserv.ligo.caltech.edu/docuserv/home/accts_adv.pdf
Irene Baldon
Worked on preparing the paper work for 16 new trips taken recently or upcoming (20 Payment Requests and 4 Advance Requests). There are approximately an additional 11 new trips in various stages pending completion of travel arrangements before the paper work can be completed.
Completed 15 Expense Reports, some of which were extensive, involving 2-3 or more pages each. There are 30 Expense Reports still to be done. I'm holding 2 completed Expense Reports which require a check from the Traveler before sending to Travel Audit to clear.
Rita continues to try to fit into her schedule some time for travel. She has 6 Expense Reports to be done at the present time.
Performed normal recording and filing associated with Travel and Reimbursement. Continued to research several items for Travel Audit in regards to Encumbrances not removed from Travelers records. Will continue to work with Travel Audit on this ongoing problem.
Prepared the Travel/Vacation Itinerary for the Week of April 10, 2000.
Dorothy Lloyd
Processed invoices, requisitions and receiving on-line. For more detail see "Cost Schedule Control Systems" report by Esther Cunningham.
Reviewed payments processed by Esther during the week of April 3. Payments were entered in contract summary sheets and the LIGO database by Jim and me.
Tracked and followed up on invoice problems.
Monitored contract and blanket order funding levels and alerted task managers where supplements needed to be made.
Jim and I continue to work on updating the PO Log Books as time permits.
Rita Torres
For I. Petrac did letters to Louisiana Tech, Louisiana State, and IAP-Russia to transmit copies of various MOU Attachments for their files. FedExed to Carleton College for signature MOU and Attachments A, and Z. Obtained Oracle requisition numbers for CSIRO, change order No. 7, and Galli & Morelli, change order No. 9. Formatted 8/99 Attachment B, and 2/00 Attachment B for University of Colorado.
Formatted Letter of Interest for Development & Fabrication of LIGO II Lasers. Over two days called 11 potential respondents to verify names, titles, addresses, etc., before sending out via FedEx. Did internal distribution.
For P. Lindquist distributed agenda for CCB scheduled for 4/11/00. Spent more time auditing Expense Reports. Usual P-card activities, reconciled some, chased invoices. Did site trip updates.
Elizabeth K. Wood
Continued with preparations for the NSF site visit and the Oversight Committee meeting on April 21.
Dealt with personnel issues.
Progress Period from 4.7 to 4.13
The Quarterly Report for the end of February is being sent to the NSF. I think we have a good report this quarter. Thanks for all the contributions. See http://www.ligo.caltech.edu/~phil/Distribution/M000135.pdf
We are preparing a schedule for the support that is going to be required for proposals, work plans, and reports for the last half of FY 2000. Clearly there is a lot of information needed, and there is a lot of overlap in the schedules that will have to be spread out given limited resources.
The following change requests have
been submitted:
| CR-990028 | WBS 1.1.3 | Beam Tube Enclosure Closeout | F. Asiri |
| CR-000001 | WBS 1.1.4 | Fencing Road at Livingston (Information Only) | G. Stapfer |
| CR-000002 | WBS 1.4 | Project Office Close Out | K. Duncan |
| CR-000003 | WBS 1.1.4.3 | Erosion Control--Livingston Observatory | G. Stapfer |
| CR-000004 | WBS 1.1.4 | Protection of Concrete in LVEA at Hanford | O. Matherny |
A meeting of the LIGO Change Control Board was held Tuesday, April 11, 2000. The following change requests were approved:
Press for the latest Contingency Needs Projection. This list should be reviewed and revised.
From: Kris Duncan <kris@ligo.caltech.edu>
No report this week.
Announcements:
--------------
(F. Raab)
The one-arm test ends at close of business Sunday,
April 16. We are still
on the hunt for noise sources manifested in the one-arm tests and will
continue this as possible (see laser work, below). Daniel Sigg is rushing
to
milk the last drop of understanding from the length servo. Doug
gets "hero of
the week" honors for rescuing us from the extra
magnet on one the mirrors (see
optics, below).
Our community relations efforts are heating up as the demand for tours
of
facilities increases. Next week, for example, we will have four separate
groups
of visitors coming for site tours, some from as far afield as Portland,
OR.
LIGO commissioning activities made the front page of the local newspaper,
which
will undoubtedly up the requests from visitors. Fred Raab has teemed
up with a
local middle school teacher and officials from Educational Service
District 123
to produce an interactive science program for broadcast to participating
schools
on the WA State K20 Telecommunications Network. The program illustrates
how the
scientific method works by resolving a simple question: "Does gravity
cause heavy
objects to fall faster?" Armed with a coffee
can, C-clamps, steel wire, some
nails, marbles and a bag of sawdust, Fred and
students will rediscover the
equivalence principle and make the world safe
for Einstein.
Bake Oven:
----------
(K. Ryan)
LHO Vacuum Bake Oven A load #83, consisting of the last LHO BSC bellow,
4K IO
Baffle components, misc. Pick Off Telescope and Beam Dump parts, misc.
stainless
steel hardware and HAM 6, HAM 12 and BSC purge air fittings, was released
on
3-27-00. This load failed its initial post bake scan and had
to be rebaked.
Load #84, consisting of Arm Cavity Baffle components, was released on
4-4-00.
This load failed its initial post bake scan and had to be rebaked at
150 C
(default is 120 C for these materials). The RGA was baked during this
rebake as
it had been contaminated by being valved into the dirty load to take
the failed
post bake scan.
Load #85, consisting of Arm Cavity Baffle components, was released on
4-8-00.
Load #86, consisting of Arm Cavity Baffle components, failed its initial
post
bake scan. Presently, this load is being rebaked at 150 C along
with the RGA
as the RGA was once again contaminated when valved in.
Theories:
1) The majority of the parts in each of these
failed loads was received
from the vendor (Allied) as having been cleaned and, as such, were
not cleaned
here at LHO as would normally be done.
2) The vent gas used to vent a load after the
post bake scan is the
source of contamination to the Vacuum Bake Oven. This could show
up as a dirty
load the next time the RGA is valved into the Oven. We are investigating
this.
PSL-IOO Mount Resonance Study:
------------------------------
(M. Landry, D. Ottoway, R. Savage, R. Schofield)
Investigated resonances associated with PSL and IOO NewFocus mounts.
Mounts were
driven with small PZT shaker and resonances identified in PSL monitor/MC
error
signal. Both (PSL) center and (IOO) corner mounts have resonances
in the
200Hz-1.7kHz range. When shaker not applied, acoustic noise couples
to the
mirror mounts and is observed as narrow resonances in the PSL Monitor
signal.
Primary acoustic noise sources are dust monitors (~133Hz), RGA controller
p.s.
(~645-650Hz), and the purge air compressor (~650Hz), all visible as
frequency
noise in the PSL monitor/MC actuator signal.
Swapping out of mounts in favour of stiffer mounts is recommended.
For a more detailed update, including figures, please see the Detector
Elog
entry for April 13, 00 at http://blue.ligo-wa.caltech.edu/ilog/
Optics:
---------------------
(D. Cook)
We were successful in removing the stowaway magnet
without a catastrophe. The
magnets had oxidized at the joint making it much tougher to separate
them. We
reset all the PAM magnets to equal distances, to the nominal starting
point. We
also remeasured the open light voltages of the OSEMs and reset them
to their 60%
open light values. These optics will be realigned during the next vent.
The FMy
optical lever is off the diode. Both the ITMy and FMy are on their
safety stops
until we complete the arm baffle installation.
The ITMy-2k Optical Lever was rezeroed and calibrated when we realigned
ITMy-2k
~3/28/00. Calibration results were averaged from 3 separate measurements
using
the "break-out" box.
Seismic Systems:
----------------------
(H. Radkins, C. Gray & M. Guenther)
BSC9, 4K ETMx: To date the Downtube/Optics Table is installed and the
Expansion
Bellows are on. The internal hardware is supported by the external
hardware
rather than fixturing and the Isolation stack is complete. The optic's
control
cabling and counterweights will be installed shortly along with the
In-Vacuum
Accelerometer for tranfer function measurements.
FMCS: The C code to convert the data generated by Building control
software to a compressed data format is finished. Juilien will integrate
the compressed data into the DAQ system next week.
Detector installation: 3 core optics suspended and awaiting installation (RM, BS & ITM-y). Resonant frequencies measured per E970154-C. Second load of COS material in bake oven. 4x10' optical table and 3 new cabinets arranged in LVEA for COS assembly. ISC optical table prepared in lab for buildup of ISCT3 next week. Sheet metal brake and shear ordered for shop. Small bake oven commissioning is in progress.
Facilities: The erosion control work along the south arm has started. The slope on backside has been re-established and the contractor is starting with the placement of the mats which will hold the dirt in place during downpours.
Bake Oven: Joe Hanson and Harry Overmier are learning to run the bake oven so we will have several people able to operate it. We are in the middle of baking several loads of telescope parts for Mike Smith.
General computing: We have received and are installing the PC we intend to use for AutoCad applications.We have also received our network monitor laptop.
Commissioning: Nothing to report beyond what is in the electronic logbook.
Community relations: Christine Casteel (Chief of Staff for Congressman
Baker) spent Tuesday at LLO helping to prepare a proposal for an educational
outreach center suitable for presenting to likely donors. Congressman Baker
is offering to lead that effort. Three classes of eighth graders from Runnels
School (Baton Rouge) toured LIGO on Tuesday, had a science lesson, and
added to our collection of murals on the beam tube enclosures.
MIT: all activity reported in other categories
All activity reported in other categories
| Installation:
Livingston |
Commissioning:
Livingston |
Other
Science/Engineering
Activities |
Three of the bases of the air bearings at WHAM 9 were rotated to facilitate installation of Z Pivot Clamps. Improper planning led to a lifting of the NW cross beam end by approximately 1.5 cm before it was realized that the scissors table needed to be constrained in order to relieve the load on the first air bearing base for rotation. There is no evidence of permanent damage seen. The other two bases were rotated without incident.
Lee Cardenas
-finished hanging and aligned
the new upgraded Ref. Cavity that will replace the existing one at
the 2K Interferometer in LHO. Pictures and measurements provided.
-turned it on and tested
the MOPA # 107 10watt Laser the one that I installed in the optic
Lab at LHO. I have checked all the parameters and I let
it run for a whole hour. the power is 10.65 watts. Lightwave claims
11.6 watts as the optimum power. It needs small alignment to get
the power wanted. All the optics inside the MOPA are well secured.
I have not found nothing loose.
-made some sketches and
working on the drawing for the new Periscope that will replace the existing
ones for the beam output from the Laser at LHO, as well as
the ones close to the reference cavity.
-have taken apart the old
PMC ( small PZT) and I will clean the optics as well as the cavity. I will
assemble one completely and will be sent to LLO.
Participated in planning for reconfiguration & test of ISCT10 and ISCT9 at LHO to "full interferometer" configuration. MZ will be at LHO 4/19-28 to help David Ottaway get under way on this and help with COS installation alignment.
Ken Mason
The ISC assembly and installation
drawings are being updated to reflect changes to optical levers, ETM transmission
monitors, camera locations, and final ISC table layouts. These will be
completed for Hanford prior to the planned shutdown.
Rolf Bork, Dave Barker
In process of installing
digital equipment part of LSC at Hanford. It is now running in the MSR
and plan to move it into the LVEA tomorrow. Ran into some difficulty, as
the PMC boards mounted on the PentiumIII processor decided to map themselves
into different memory space than our other units and we had to reload and
rebuild a new vxWorks kernel to accomodate this.
Wrote a preliminary version of the ISC supervisor code necessary to communicate with the LSC front end. This was done, for now, as an extension to the previous ASC supervisor code. It should be sufficient to allow initial checkout of the front end software.
Barker has installed automatic backup and restore for the ASC system. This will require removing a fair amount of initialization software from the ISC supervisor code. This will be done tomorrow.
Daniel Sigg, S. Whitcomb
Installed and aligned new
ETM transmission assembly in X-mid station.
Arm Cavity Baffle:
Assembly and installation
drawings are complete and have been sent to LHO.
Faraday Isolator:
One baked magnet assembly
and half-wave plate arrived at LHO.
COS Alignment Procedure:
Alignment targets for the
ITM, FM, BS, RM, MMT3, and MMT2 optics support structures are being designed;
drawings will be sent to several machine shops to fabricate the parts by
4/21.
The monitor I've been working on most recently looks for jumps in either the signal value or its sigma at 1/16th second boundaries where the DAQ system switches front-end buffers. This was brought on by a 1/16th second glitch that Daniel noticed in the engineering run data where uncorrelated data had apparently been inserted. At present the monitor generates triggers at a rate of about one per 10s of input data (for all engineering run channels). This still seems to be dominated by false triggers (wildly swinging channels) so there is some hope that I can reduce the trigger rate. If not, the LDAS database will get a little more exercise.
Julien Sylvestre
The first 8 hours of the
engineering data run of 3-4 April (E1) have been passed through the software
I developed in the last few weeks, in order to identify transient events.
Special attention was paid in this analysis to the transients that were
correlated with the seismometer channels. The most interesting and intriguing
type of burst that I've found is a "chirp" with monotonically decreasing
frequency that last ~80 seconds, with frequency going from ~105Hz to ~50Hz,
and amplitude increasing for the first 40 seconds, and then decreasing
below the detectability threshold. This type of burst is observed at least
in the two seismometers, the accelerometers located in BSC5 and BSC7, and
the control and error signal of the cavity, with delays of the order of
5 seconds between the corner and mid-station instruments. At least 6 such
bursts were seen in the MX seismometer data over the 8 hours analyzed,
and 2 of these 6 bursts are clearly visible in the control and error signals
(the other 4 have not yet been examined in detail). No correlations were
found between these bursts and control changes recorded in the Epics control
logs.
Many other correlated bursts
in the seismometers and the error and control signals, but with less "structure"
and generally lower frequency than the type described above, were also
observed. The "data crunching" of the remaining 12 hours of data is expected
to be completed by the end of this week, and will be followed by the classification
and the characterization of the transients detected.
I also started working on
implementing the algorithm used to obtain the results above and a simple
match filtering algorithm for the Data Monitoring Tool.
Guido has correlated and for the most part understood all of the modematching data, including recent beam profile measurements by Stan. While there are some loose ends (mostly due to uncertainties in measurements and fitting), the mode matching into the arm cavity is good (< 90%). Based on this, the distance between MMT2 and MMT3 is roughly 8 to 10 mm to large and recommend to move MMT2 by 8mm closer to MMT3 (and MMT1, but that doesn't matter).
After some work with adjusting gains and making minor modifications to the servo modules, we succeeded in getting the cavity locked and controled with all three servo paths: feedback to the ITM at low frequencies; feedback to the mode cleaner length at intermediate frequencies; and feedback to the mode cleaner error point at high frequencies. As with the feedback to the ITM, we found it necessary to electronically notch out the mode cleaner mirror internal mode (though only the first, drumhead mode at 28kHz). The unity gain frequency of the servo was increased up to 7-8 kHz, very close to the design value of 10-15kHz (we ran out of gain). At this point the most striking thing is that the 2km cavity residual error signal is extremely small -- it is at the level of noise floor of the DAQ ADCs. Some further characterization of the relative gains in the feedback paths will be pursued in the remaining time before shutdown.
New alignment matrix (Rolf
Bork, Dick Gustafson, Daniel Sigg)
We previously recognized
that the alignment and centering servos were operated in a rather peculiar
state. The centering gain (QPDX to beam splitter) was much higher than
the alignment gain (WFS to ITM/ETM). However, the sensor/actuator matrices
(2x2 for WFS and 1x1 for QPD) assumed that the other way around. In order
to obtain a better behaved servo the matrix was extended to a true 3x3
matrix (9x9 in reality to account for all degrees-of-freedom eventually
used in the full LIGO) with coefficients separate for pitch and yaw. The
rms alignment fluctuations are now about a factor of 2 better than previously.
In particular, they don't show any gain peaking around 2-3Hz. All together
indicating that the new matrix settings are superior.
The alignment of the MC was
lost when power to the PZT alignment mirror tip tilt stages was lost; unfortunately,
re-biasing the PZTs at the operating voltage did not bring them back to
their original position. We are ordering new PZT tip tilt stages with built
in strain gauges which will insure that a loss of power to the MC alignment
mirrors on the PSL table will allow a quick recovery of the alignment.
The PMC servo in the PSL Lab was debugged. Inspection of the error point showed a strong signal at 540 Hz. This peak was also present in the frequency servo error point. It was observed that Lee Cardenas's radio (tuned to 108 MHz --- the 200000th harmonic) dropped out depending on the frequency servo common gain setting. The cause of the peak was traced to a pair of jumpers inside the 10-W laser, that enabled/disabled access to the FAST actuator via the system interface. Once these jumpers were removed, the peak disappeared.
The PSL has been operated with a new configuration in which the beam to the reference cavity is picked off after the PMC. The operation of both the PMC and frequency stabilization servos is not as independent as before. Whilst lock acquisition was easier than expected, adjusting the frequency servo common gain showed a small effect on the PMC servo error point. Adjusting the PMC servo gain affected the frequency servo error point. The dynamic range of the phase-correcting Pockels cell was mostly taken up fighting the PMC PZT resonance. Both the PMC and frequency servo remained locked in the test configuration for 4 days.
Intensity stabilization did not appear to have any effect on either the PMC nor frequency stabilization servos.
All three servos have been
operated concurrently. The performance is summarized as follows:
-frequency noise (in-the-loop) approx. 10 mHz/Sqrt[Hz]
-intensity noise approx. 3e-7 per Sqrt[Hz]
-power throughput 5 W (for 6.9 W incident)
The temperature in the Metrology lab has been out of control for the past several days. This is probably due to the weather change. Mike Segal, our physical plant contact, is retiring at the end of this month. I hope to have a fix in process before he leaves.
>
>Last week at this time we had all three mirrors of our mode cleaner
>suspended and successfully damped, and we were beginning to align
the
>cavity to our laser. We first tried alignment with the mirrors
held in
>place by their earthquake stops, and that proved surprisingly easy.
We got
>the 00 mode resonating with no difficulty, and we are now in the process
of
>extracting an error signal in preparation for attempting a lock.
>
>We have also been working on our PSL to verify that it is in good
working
>order before trying to lock our mode cleaner. We have no problems
with a
>narrow-band lock, implemented with an SR560 as the filter/amplifier,
but
>our broadband servo appears to be problematic: lock is relatively
difficult
>to acquire (which it was not before), and the system does not stay
locked
>for long (it used to stay locked for days). We are currently
in the
>process of debugging this stage.
LASTI (Zucker, Kruzel, Shoemaker)
---------------------------------
Vacuum system:
Completed and tested annulus system on MHAM21. Turbo
and ion pumps are working very well; gas load from the O-rings
(water and N2, presumably)
is still too high to cross over, but results looked
good enough to finish the other 3 annuli the same way. HAM13
is
done/ready to test and BSC0 and HAM20 nearly so.
RGA system was installed and tested OK. Plan is to expose it
to the system tonight or tomorrow morning to get a quick peek
at what's inside.
Lab infrastructure: Particle counts took a hit when contractors
arrived to repair our outer rollup door, which had a burned out motor.
Fortunately nothing critical needs to be opened for a while.
The construction activity nearby has worsened considerably and moved
even closer to the North end of the high bay. As evidenced by our
resurrected seismic RMS logger, they are still only working 8-hour
shifts.
Data Analysis and Computing (Blackburn for Lazzarini)
Simulation and Modeling
Lock Acquisition:
Matt Evans gave a summary talk of his lock acquisition study in a
tele conference with LSC/ASC and e2e people attending. The view
graph is available http://www.ligo.caltech.edu/~mevans/vg000412.pdf
Simulation Code:
The 3d mirror model is developed and is now being tested and improved.
The thermal noise issue is also being studied.
Alfi:
Internal structure has been changed for a more robust handling of box
files for the new and demanding directory structure.
Upating alfi component tree code to use the more stable alfinode tracking
system Ed and I have worked out. This will also allow for the resolution
of the absolute vs. relative path question.
LIGO Data Analysis System - LDAS
LDAS Software (Blackburn):
This week was spent making changes to the LDAS software that came out
of
the experiences using the system at Hanford during the one-arm-test
run.
The problem of not being able to handle null fields in the LIGO_LW
data
sets the DMT generated has been fixed in both the metadataAPI and the
lightweightAPI. Early testing indicates that we are able to handle
these
types of LIGO_LW documents now. Work on the managerAPI and the under
development controlmonitorAPI will also resolve the issues of consistently
starting up the LDAS system that were identified at the engineering
run.
The new version of the FrameCPP library has successfully been integrated
into the frameAPI. The library supports the TOC but support for this
library has not yet propagated into the frameAPI. Still tests with
the
new library show that the frameAPI is working as before. Also, frames
were generated using the new library and shared with VIRGO. Benoit
Mours
identified some bugs in our format and the library was changed to correct
these issues.
The LDAS webpage has a new look and feel this week. Barbara's efforts
to make the presentation of LDAS information more easily navigated
have
paid off. Several new feature still need to be added, like links to
the
new web-based read only access to the LDAS CVS respository and the
LDAS
software itself needs to present the needed API log files to these
pages.
A strong effort was made this week to prepare a version 0.0.11 release
of
LDAS which will be used in a simulated run in conjunction with a run
of
the DMT to generate triggers from the one-arm-test run and ingest the
results into the LDAS database. The needed changes for this run are
almost
complete and we hope to have the software mirrored to the sites for
the
test by Saturday.
The licensing problem with DB2 at the sites has been resolved. It turned
out that the upgrade process from 5.2 to 6.1 left packages supported
under
the old license but not integrated into the new license. Simply removing
several files resolved the problem.
Peter has added to the engineering run webpage instructions on how
to
remotely access the data from the run.
Transients Identification (Julien Sylvestre):
The first 8 hours of the engineering data run of 3-4 April (E1) have
been passed through the software I developed in the last few weeks,
in order
to identify transient events. Special attention was paid in this analysis
to the transients that were correlated with the seismometer channels.
The most
interesting and intriguing type of burst that I've found is a "chirp"
with
monotonically decreasing frequency that last ~80 seconds, with frequency
going
from ~105Hz to ~50Hz, and amplitude increasing for the first 40 seconds,
and
then decreasing below the detectability threshold. This type of burst
is
observed at least in the two seismometers, the accelerometers located
in BSC5
and BSC7, and the control and error signal of the cavity, with delays
of the
order of 5 seconds between the corner and mid-station instruments.
At least 6
such bursts were seen in the MX seismometer data over the 8 hours analyzed,
and
2 of these 6 bursts are clearly visible in the control and error signals
(the
other 4 have not yet been examined in detail). No correlations were
found
between these bursts and control changes recorded in the Epics control
logs.
Many other correlated bursts in the seismometers and the error and
control signals, but with less "structure" and generally lower frequency
than
the type described above, were also observed. The "data crunching"
of the
remaining 12 hours of data is expected to be completed by the end of
this week,
and will be followed by the classification and the characterization
of the
transients detected.
I also started working on implementing the algorithm used to obtain
the
results above and a simple match filtering algorithm for the Data Monitoring
Tool.
LDAS Hardware (Anderson)
The LDAS data conditioning API quad-processor SMP box has arrived and
is undergoing initial system integration and testing in preparation
for
LDAS software development and the first LDAS Mock Data Challenge
during the first week in August.
The CIT LDAS AIT-2 tape drive has arrived and been successfully used
to read the April LHO engineering run data on to disk. They will be
archived
in to HPSS shortly and along with the already available CDS trend frames,
be available via ftp hpss.cacr.caltech.edu. See the eng.2000.apr rows
in
the LIGO archive table at http://www.srl.caltech.edu/personnel/sba/ligo/hpss.
There is an ongoing struggle with IBM and Lucent to obtain replacement
parts for a key network switch at CACR that provides the fast ATM data
link between LIGO and CACR. Reliable access to HPSS is now obtained
via the fast Ethernet connection, i.e., hpss.cacr.caltech.edu. Connections
to hpsssw.cacr.caltech.edu (i.e., ATM) are currently at some risk
of corrupting user data.
General Computing
CIT:
(S. Singh)
Installed a video switch in PC server room at basement
of west bridge.
Connected three NT workstations to a single monitor
through the switch.
Ran 2 ethernet cables for 125 and 115 subnet each
from main server room
to PC server room and put those NT's in the network.
Setup 4 new user accounts for new employees at Livingston
laboratory.
Fixed some printing problems.
Did some paperwork for purchasing new hardwares
and supplies.
(B. Kratochwill)
Installed software on the new server for the
public web applications.
Copied over the public DCC search tool and
cost book.
Set up a weekly process to compact/repair
the DCC document database.
Began efforts to make the cost book look like
Primavera.
Fixed a problem searching by Year in the public
document search tool.
Continued work on the new home page.
From: Helena Armandula <ahelena@ligo.caltech.edu>
Because conflicting schedules at REO, the calibration coating run of
sapphire substrates have been delayed by one week.
From: Sam Richman <srichman@ligo.mit.edu>
Stiff isolation system (S. Richman)
A major focus of this week's efforts was integration of the broadband
seismometers. Open-loop transfer functions were made of both
horizontal
and vertical channels. The three upper stage vertical loops have
been
closed using a combined sensors comprising relative position sensors
(DC -
50 mHz), broadband seismometers (50 mHz- 15 Hz), and geophones (15
Hz - 50
Hz). With the initial controller, there is about a factor of
5 isolation
at 200 mHz.
From: Riccardo DeSalvo <desalvo@ligo.caltech.edu>
Sorry yesterday we were too busy to look into the new TAG questions,
the
entire meeting went, we will have a double weekly report next
week,
For additional information about this report, contact sanders@ligo.caltech.edu