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The LIGO Executive Committee
Agenda for Monday October 9, 2000 will be:
(Meeting time: 10:30 am Pacific Time)
Open meeting 10:30 - 11:30
Special Items:
No report.
WBS 1.2 LIGO Operations--Administration
Next week the agenda will include a discussion of the model for the sites for 24-7 staffing to support operations. Budgetary and safety implications will be discussed. The meeting will be attended by LIGO and Caltech safety personnel.
We met on October 3rd to discuss the FY 2001 and FY2002 budget requests. Several integration issues remain open:
From: Ed Chargois <chargois_e@ligo.caltech.edu>
>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. . .
| Packages | Faxes | |
| In | 49 | 41 |
| Out | 32 | 33 |
Press here to access the DOCUMENT CONTROL CENTER WEB PAGE.
From: Esther Cunningham <esther@ligo.caltech.edu>
Press here for ACCOUNTS PAYABLE HISTORY DATA.
From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>
Working on the change order and setting up the file for Hytec, and Sydney
Meshkov (new consultant contract) in addition to continuing to close FY99
POs.
Attended the meeting with the Washington State tax auditor along with Ed and am working on gathering data and invoices on the general use computers.
From: Florence Kaufman <fkaufman@ligo.caltech.edu>
From: irena@ligo.caltech.edu (Irena Petrac)
·Worked
on, and completed twenty-six (26) Expense Reports.I
have twenty-nine (29) outstanding reports at the present time.Rita
Torres has taken six (6) reports to work on.
·Prepared
the Travel/Vacation Itinerary for the Week of October 2, 2000.Performed
normal recording and filing associated with Travel and Reimbursement.Worked
on several problem issues with Travel Audit.Also
performed miscellaneous duties as requested by various members ofthe
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. I also have experienced, in addition to
network shutdowns, a problem with my computer going down for no apparent
reason.Larry Wallace has been informed
and he has called for repairs.
Dorothy
Lloyd
·Received
billed amounts on-line, to close out and remove remaining encumbrances
on old POs. Adjusted LIGO database accordingly.
·Managed
to do some miscellaneous filing and continue to work on PO Log books.
·Processed
the usual requisitions, invoices and receiving on-line. For more detail
see "Cost Schedule Control Systems" report by Esther Cunningham.
·Tracked
and followed up on invoice problems.
·Reviewed
and recorded payments processed by Esther for the week of September 25,
on contract summary sheets and LIGO database.
·Continue
to monitor contract and blanket order funding levels and notified task
managers when supplements are needed.
·Jim
continues to do data entry in the LIGO database and help out in the DCC.
Rita
Torres
·Formatted
MOU, Attachment C & Z to Southern University and A&M College, Baton
Rouge.Prepared to send via FedEx
various MOU documents to the universities for signature: Syracuse, Carleton
College, LA Tech, VIRGO, IAP.Formatted
some of these (including Dominquez Hills) from email to conform to the
established Frame format.Scanned
signed documents for the LSC web page.Chased
some errant information to update web posting.Final
updates (minor edits) to LSC roster.
·Continued
preparation of letters to IFB holders receiving IFB EJ-319, Staging Building
& Renovations to Existing Building at LIGO Livingston.At
the same time updated the bid holders list as new names were added.Did
Amendment No. 1, and subsequent Amendment No. 2 to EJ-319.
·For
P. Lindquist assembled Amendments to the Cooperative Agreement in preparation
for review by LIGO management.Scanned
these documents as well so that .pdf version will be available for planning
the next document.
·For
F. Asiri obtained copies of 3 sets (10pps/set) of drawings.Coordinated
eye exams for three people, prepared a new form for these appointments.The
new form bears address and directions to the new offices of Pasadena Eye
Medical Group.
·Distributed
to administrative personnel the overdue LIGO Personnel Roster.
·Re-input
a requisition to correct some errors.For
Detector group, helped make corrections to a technical paper.
·Collected
personal requests/money for issues of Sky & Telescope and Astronomy
for LIGO enthusiasts.Passed these
on to E. Wood.Did site trip updates
and Pcard reconciliation.Chased
documentation for a credit I was unaware took place.
Elizabeth
K. Wood
·Prepared
a proposal to the NSF for the 20001 Aspen Winter Conference on Gravitational
Waves for Syd.And yes, it’s in TeX.It
looks lovely.
·If
you noticed any discrepancies in your vacation/sick leave on last week’s
pay stub, rest assured it will be fixed on the next pay stub.(Now
watch everyone frantically looking for their pay stubs to see if there
was an error!)
·Attended
a space survey meeting with PMA.No,
my space survey meetings aren’t nearly as interesting as the astronomers.It
was just a survey of the quantity of earth-bound space LIGO utilizes on
campus and how we use it.
·Set
up some last minute telecons using AT&T conference services.
Progress Period from 9.29 to 10.5
Accomplishments:
The following Change Request has
been submitted:
| CR-000017 | WBS 1.1.4 | Design building for office space, laboratory space, and auditorium. Modify Staging building | O. Matherny |
Copies have been distributed via EMAIL and attached .pdf.
Press for the latest Contingency Needs Projection.
From: Kris Duncan <kris@ligo.caltech.edu>
The financial reports on the web provide supporting
detail.
http://docuserv.ligo.caltech.edu/~fireport
http://docuserv.ligo.caltech.edu/~finance
From: Ed Jasnow <jasnow@ligo.caltech.edu>
Approval was granted by the NSF for the contract to pave the service roads at Hanford. This contract will be to Inland Paving, Inc., for $215,000.
A pre-bid conference and job walk was held at Livingston for the new
staging building. Eight general contractors were represented.
The attendees were given an overview of the project, and then taken out
to the building site itself. Bids are still scheduled to be opened
on Thursday, October 19.
General Items:
--------------
(F. Raab)
No outstanding news this week. We are chasing a number of performance
issues in the background of commissioning efforts and continuing to stage
what we can for the 4K installation.
Vacuum: One of our two large backing pumps (which back the blowers) failed Wednesday during pumpdown of the LVEA. A detailed diagnosis has not yet been made, but some repair costs are certain. Evacuation continued with the remaining backing pump and is now being pumped with the turbo pump. Leak checking of the VE will begin as soon as pressure is suitable. (Sibley)
COC/SEI INSTALLATION: The vertex is closed and Allen began the
pumpdown yesterday. We're spending this week doing housekeeping in the
LVEA. All 4 large cleanrooms are being moved to the backside of the
beamtube, to clear the area for leak checking and cable pulling. We've
received new Optical Lever Lasers from MIT, and we'll replace those
on MMT-3, the RM and BS. I'm going to leave the ITM OptLevs operating with
their original lasers, until we open each arm and acquire the beam
at the ETMs. I want the leave the Vertex in good shape for the Commissioning
Team,
so it looks like we may not make it to ETM-x until late next week.
We received the spare bellows from LHO, as well as the 4 from HYTEC last
week.
We cleaned on of the units which had been installed at HYTEC, and following
a 48hr bake it passed. We'll clean the balance as time permits.
(Jonathan Kern)
CDS related: All field cables that go from 1X8 & 1X9 (ASC & LSC) to ISCT1, ISCT3 & ISCT4 have been fabricated. They will be installed after cleanup of IOT1.field cables that go from 1X8 & 1X9 (ASC & LSC) to ISCT1, ISCT3 & ISCT4 have been fabricated. They will be installed after cleanup of IOT1. (Rus Wooley)
GC: Added a cgi based search engine to our web server. Laura
had been using a free service from hotbot.com but it frequently missed
pages and would
come up with no results for searches. I think it is working great.
Laura will be incorporating it into the LLO home page when she gets a
chance. There is a sample that you can try at http://abundance.ligo-la.caltech.edu/htdig/sample/search.html.
Received three quotes on an Exabyte tape robot for GC. We are looking
at the Exabyte 220 with two mammoth tape drives. Tom, Christine, Larry
and I
are discussing possible strategies for our GC servers to ensure limited
downtime incase of a failure. We are debating on the best way to create
redundancy in hardware, backups, etc. (Shannon Roddy)
CDS/LDAS: Assisted Rolf with a few tasks in the mass storage
room. There is now a KVM switch on all of the computers in the CDS racks
in the mass storage room with the exception of LLO1. Took care of a list
of items for LDAS via Stuart's request. Still have some troubleshooting
to do on one of
the LDAS linux machines. I suspect it has a bad hard drive. (Shannon
Roddy)
Other: Approximately 20 students and faculty from the
Univ. of New Orleans and from Loyola Univ. toured LIGO last Saturday.
| Installation
& Commissioning:
Livingston |
Other Science/Engineering
Activities:
Issues/Concerns |
See also the Installation web page
Peter Shawhan, Michael Landry,
Richard McCarthy, Bill Butler, Dave Ottaway, et. al.
Following the re-leveling
of the mode cleaner (in order to reduce the effect of the 14.7 Hz suspension
vertical bounce mode on frequency/length; reported last week), an iris
was found to be clipping the input beam (at the top of the periscope at
the exit from the PSL/IO table), so the MC was re-leveled. Following the
leveling of the MC, the output of the mode cleaner was no longer aligned
to the recycling cavity or the arms, and needed re-alignment, with the
suspended steering mirrors. Although this was accomplished, the alignment
still needs further work. In addition, the position of the input beam was
also varied in an attempt to optimize the coupling to the MC. (details
of the final leveling).
Dick Gustafson
60 Hz and related power
noise investigations. (details)
Bill Kells, Matt Evans
Most effort on trying to
understand LHO 2k locking situation. Spent a lot of time running Matt's
e2e aquisition code, and iterating back and forth with Matt on aspects
of the code.
Malik Rakhmanov
Performed an independent
calculation of Hanford 4k mode-matching. The results agree with those of
Dave Ottaway: the projected waist is 1.63 mm at a distance 7.51 m
away from the PMC in the new PSL layout.
David Tanner
The reworked top block for
the last SOS was shipped to LHO this week, along with some additional dowel
pins.
A pre-modecleaner is currently being fabricated in the PSL Lab for eventual deployment at LHO. Lee has been measuring the beam parameters, free-space propagation and M-squared for the LHO spare laser SN #107b. The relative intensity noise of the laser was measured. The laser is within the Lightwave specification, except for a small region around 10-13 kHz where the noise is about twice the specification. As I recall, all the lasers exhibit this characteristic. see also comments below regarding delivery of a PSL for the LHO 4km interferometer
4k Faraday Isolator is being re-checked to improve the extinction and transmissivity characteristics. A HAM2/3 Beam Dump assembly was delivered to CIT . Received small baked parts from LHO, from which Lee will be able to put together the remaining (8) steering mirror mounts for the Telescope optical trains for the 4km interferometer.
The vacuum system has now been buttoned up, and pump down has started. An in-vacuum check of the length is planned first, to be followed by a resumption of regular commissioning tasks.On Friday 29 Sept, the length of the mode cleaner was measured (details). The length was almost 700 microns away from the intended length (correcting for the index of the air.) MC2 was moved to adjust the length, and also to reduce its yaw misalignment. A second iteration was required on Monday 2 Oct, finally achieving the intended length to closer than 100 microns (details). The method to check the MC length (details in LLO e-log) was to lock in p-pol, sweep the 24.5 MHz res. sideband EOM and look for the dip in the reflected light. After a few iterations of measuring and moving (correcting for the index of refraction in air), we got: L_mc = 12.23997 m +/- 50 um (target was 12.240 m). We discovered that the HAM table should be in *final* configuration when making the measurement. We checked the difference in res. freq. with the MC2 baffle in place and moved by ~ 20" toward the center of the HAM; led to a difference of ~ 300 Hz, qualitatively consistent in sign with the change in the suspension point of the optic. (more details) Cavity visibility in air looks pretty good; the reflected light drops to 0.07 of incident power on resonance (no measure of T yet). Rich Riesen and Sany rechecked the RFAM of the 24.5 MHz EOM after re-alignment to reoptimize mode matching to the MC. The measured RFAM was in a range of 2.47e-5 ~ 3.35e-5 over a half day (sampled at random intervals). A data logger is being set up to monitor constantly. (more details)
I have been working on a model for the modified current shunt in Simulink. Thus far the pole-zero fit to the magnitude is okay but the calculated phase does not match the measurement obtained in the lab. A loaner 10 MHz FFT dynamic signal analyzer arrived, which allows us to make measurements just that little bit further than what the Stanford SR785 FFT allows. I hope to include the results from 100 kHz to 1 MHz in the model to try and get a better picture of the intensity stabilization. The LHO spare laser, SN #107b, arrived on campus and was installed on the PSL Lab optical table. SN #110 was shipped back to Lightwave Electronics for repair. The rotary encoder for the laser power supply was replaced, following a failure that occurred some time ago. Two current shunts, from lasers SN #109 and #107b, have been modified to include the high wattage resistor. The paperwork for ordering the LASTI PSL phase modulators has been submitted. The costs to date incurred for fabrication of the 40m Lab PSL and LASTI PSL were submitted to Alan Weinstein. We are currently formulating a plan to deliver a laser (light source) to Hanford, MIT and the 40m Lab to enable early IO installation activities and prior to delivery of a coplete PSL system. Work is in process in the following areas. We are: Generating a listing of all OTS and custom components which make up the PSL Assessing the parts situation for the custom modules Making a determination of workload and resource requirements to build and test individual modules and assemble the PSL. Making preliminary scheduling estimates
The LSC group met at MIT for a status review and technical fact finding (in the wake of Dale's departure). Prepared a prioritized list of items and distributed the work among Rich, Todd, Mohana, and Flavio. Set dates to support LSC commissioning activities at LLO: Rich, Jay and Flavio will be at LLO during the week of 23 Oct. In the process of ordering parts for the Photo-detectors to use in the LLO LSC. Boards will be ready for the 23 Oct. installation and commissioning trip. Finishing up the MC Servo re-design, and will be doing the PCB board layout end of this week.
<<D. Coyne>> Jay et. al. expect to recommend one of the 3 circuit design concepts tested to date in about 1 week. We will then hold a techncial review before embarking on a final design and production.
Surmet has not completed the heat treatment and UltraC-EC coating run yet on the Macor heads (which have been reworked to have larger radii on edges). Placed an order for 2 IFOs-worth of alumina heads with Progressive Technology. They quoted the best price and delivery (of about 5 weeks.)
The schematics for the LOS coil driver are 80% complete and long lead parts have been ordered. Board layout should begin by the end of the week. SOS dewhitening and coil driver designs are on hold for comments. Hopefully designs will be resumed by next week.
All control parameters (channels, limits, time-spans, etc) are specified in a configuration file which can be changed easily as needed. Although the real power of the DMT comes in being able to tailor a monitor to look at specific properties of a given piece of equipments in unique ways, the generic operations used in this prototype monitor will likely be applicable to other parts of the LIGO apparatus.Collect spectra. Optionally compare the spectra to a known good spectrum, or store it to the metadatabase. Watch the RMS of specific frequency bands, write it to a trend file, and optionally generate triggers if the the goes above or below specified limits or increases by a specified absolute or fractional amount. Look for glitches. Trend the number of glitches found in one second intervals, and optionally save a data snippet around the glitch.
No report.
LASTI (Mason, Smith, Shoemaker, Kruzel, MacInnis, Zucker)
----------------------------------------------------------
Moving/logistics:
Last of the moving for a while (we hope) will be done tomorrow with
shipment of the spare BSC downtube and stack leg elements to LLO.
ABC
Services cleaning crew has almost finished top-to-bottom scrubbing
of
the high bay and we should be back in booty mode tomorrow. It's still
too crowded in there, but everything left is slated for
installation in the next few weeks.
Having carefully set up and tested a new gantry hoist for handling the
HAM doors, Corey Gray alerted us that the door weight listed on PSI
drawings was low by 35%. A bigger hoist is on its way.
Cleanrooms:
Our #1 HAM cleanroom (right arm) is operational. The #2 HAM cleanroom
(left arm) is getting new curtains and electrical hookup but these
are
on track to arrive before they are needed.
HAM SEI installation:
External piers have been placed on the HAM's with exception of one
which had an unusual bolt hole (turns out it intersected an empty
electrical conduit which terminates somewhere in Singapore).
The hole
has been plugged and the anchoring should be finished tomorrow.
Hugh
Radkins will be out Tuesday to begin fine alignment and internal SEI
installation with us. Corey Gray will also join us the following
week. We are looking forward to learning the great secrets of
the Old
Masters.
Vacuum envelope:
MZ is doing some last minute tweaks on the vacuum system
to try and speed up cycling time for bellows leak checks.
Simulation and Modeling (Yamamoto)
Lock Acquisition
Matt has been working to improve the algorithm of the lock acquisition.
Luca has introduced alignment noises to mirrors, and compared with
the PRM+one arm lock experiment with different misalignment angle
of the end test mass. The simulation could reproduce the characteristics
of the cavity state as a function of the misalignment.
Biplab continued his work to study the effect of the misalignment on
the
time of the lock acquisition.
Bill Kells has compared with simulation of the LHO 2K model with his
40m results (with proper parameter change) and found a qualitative
agreement. (The phenomenon was, when PRM was locked with ETM
misaligned and then the ETM is moved back to be aligned, 40m did
not kick PRM out of lock, but 2k IFO does.)
Noise model
Biplab is working to generated the noise curve of the in lock state
LIGO IFO, which includes the seismic, thermal and shot noises.
Optics simulation
Hiro and Biplab worked on the improvements of the implementation
of the field and optics. The problem of the field calculation when
there
is a curvature mismatch has been pursued further, and found the
origin. This will be included in the code soon. The direct effect of
this
problem is that the fields in PRM cannot be properly calculated.
So far, the main focus of the Han2K simulation was length related issues
and they are not affected.
Simulation engine code improvements (DAngelis)
The matrix class has been improved in several ways and the Hanford
2K IFO simulation code is running several 10% faster. The last change
seems to have introduced problems, and it is being debugged. Once this
bug is fixed, the code change will be included in the official e2e
code, and
a new faster simulation code will be released.
GUI -Alfi (Maros, Sears)
The change of the code for the graphics rendering seems to be working.
Several glitches introduced by this code change have been reported
and are being tried to be solved. Other changes making the entire
code more robust have been discussed and going on.
LDAS Software (Blackburn)
Much of the week was spent testing and debugging the current version
of LDAS in preparation for a big push of the software to the sites.
We have been testing the software much harder, using larger data sets
to identify problem areas in the code. A bug in the ilwd writer was
resolved last week and this week the same bug was traced to exist in
the ilwd reader. It is actually a bug in the standard library's
ostrstream class. A replace named ldas_ostrstream was written this
week which does not have the problem found in the GNU source.
Development of new testing scripts also begain this week. The current
scripts produce large amounts of data that are timely to analyze. We
will be implementing statistical summaries on top of these data results
which will allow us to more quickly recongnize problems and then using
the full result set, discern the location of QA and performance problems.
Another big fix the the system this week involved tracking down a bug
in the generic threaded function wrapper which was causing all exceptions
thrown in the C++ layer of threaded functions to be lost. This has
now
been fixed tested.
The LDAS hardware system at Livingston was upgraded this week to be
identical to Hanford. A new set of database tables were added at the
end of this hardware upgrade so that the metadataAPI which will be
part of the next push of LDAS to the sites will be compatable with
the
table design at Hanford and CIT.
The problem tracking system reports a 35% decrease in the standing
number of open problem reports. This is concurrent with a rapid set
of
new problem reports being opened and closed during the extensive testing
phase we are currently in as we prepare this next release.
At the weekly MPI working group meeting, status reports show that the
new wrapperAPI, mpiAPI and dynamic shared object development are all
on track with the current schedule.
Several prototype Unified Data Type classes were distributed to the
dataConditionAPI working group this week. There is some concern that
the implementation is starting to lead the way over the intended set
of requirements. Sam Finn has requested that everyone identify design
criticisms with the requirements and not the prototypes. This is a
totally reasonable request given that the flexibility of C++ has not
been demonstrated to stand in the way of any requirement issues.
LDAS Hardware
no report
Computing (Wallace)
MIT:
Working on getting the disk system setup on the SUN 450. Hopefully,
received the
Solaris 8 disks they have been waiting for.
Livingston:
(Shannon Roddy)
-Added a cgi based search engine to our web server. Laura had
been using
a free service from hotbot.com but it frequently missed pages and would
come up with no results for searches. I think it is working great.
Laura will be incorporating it into the LLO home page when she gets
a
chance. There is a sample that you can try at
http://abundance.ligo-la.caltech.edu/htdig/sample/search.html.
-Received three quotes on an Exabyte tape robot for GC. We are
looking at the
Exabyte 220 with two mammoth tape drives. Tom, Christine, Larry
and I
are discussing possible strategies for our GC servers to ensure limited
downtime in-case of a failure. We are debating on the best way
to create
redundancy in hardware, backups, etc.
Hanford:
Nothing to report (check Hanford report).
CIT:
(Sam)
-Helped deal with problems with the new dell laptop. It was DOA and
has been
replaced. Installed software on it.
-Helped install autocad2000 on a couple computers
-Installed a new hard drive
-Worked on cleaning up my office and started classes
Lisa
- set up printing for Janeen Romie
- did monthly backups
- Rich Abbott's laptop has been very unstable. I've done everything
except
rebuild it from scratch. I ran Norton, reinstalled Eudora, updated
IE,
uninstalled VB, changed the subnet. I'm hoping it's stable now.
- Spent some hours trying to get fvwm running under Solaris 8.
The NIS+ server
pushes out some global configuration files that it seems to be unhappy
with.
However, just removing the automount for those files does not fix the
problem.
Instead, it disables it completely.
- Started putting together a web site to collect up information about
the
Cadence installation here at Caltech. As I become aware of user
problems I will
add them to the web page so other users can see them.
- Moved a 200mhz pc to be used to run a piece of engineering equipment
in Wilson
backhouse.
- Completely cleaned out and organized our cable closet.
- Created a group in NIS+ for the klab cadence users. This allows
me to give
them permissions to edit their setup script(s) which resides on the
cadence
disk.
(Barbara)
- Finished up changes to LSC roster database and web pages for this
cycle.
The web pages are undergoing final review and will be posted as soon
as
they are approved.
- Finishing up changes to Pubs database and Publications web pages.
- Made a set of changes to LDAS web site.
(Suresh)
-I resolved the VLAN (virtual LAN) in ES 3810 Ethernet switch mapping
to ELAN
(emulated LAN) in ATM switch problem by reconfiguring it.
-Measured direct port to port and port to port via ATM uplink data
transfer
speed in above mentioned switch. The average port to port speed was
92 Megabits
per second whereas port to uplink was 80 Megabits per second. Omar
helped me in
this measurement.
-Configured newly arrived ES 2810 ethernet switch. Also measured its
port
speed.
(Larry)
-Worked a number of procurement issues and working on a number of orders
for new
SUN equipment, PC's, video equipment and projectors. Working with the
financial
group to clear up some items for an audit they are preparing for. Worked
with Ed
C. on getting the projector installations started.
-Working with Lisa on getting a number of the cabinets reorganized.
This
includes turning a number of old machines over to Caltech. A couple
of the old
Sparc 5's will be sent to Livingston for GC test work.
-Resolved a number of hardware and software issues. One problem that
has been
getting in the way is the changing the operating environment in ways
that cause
other problems. Working on educating the users and modifying the base
environment to where it will not be affected as much.
-Still shuffling computers around and it looks like this will be going
on for a
couple more weeks.
-Trying to spend a little more time working on issues with the Observatories.
Trying to get the network (WAN) items back on track.
Stiff Active Isolation Two-stage Prototype
Jamie, Rana
Earlier this week, we were able to close all 12 loops on both stages
with
all 30 sensors. With current non-optimized gains and sensor crossovers,
we were
able to achieve ground noise suppressions at the lower stage of roughly
56 dB
vertical and 33-40 dB horizontal at 10 Hz, decreasing to only about
10 dB or
less at 1 Hz. Our next step will be to implement a collocation
matrix for the
lower stage. When implemented in the upper stage, we were able
to vastly
improve low frequency noise. We also plan to optimize the position
sensor/geophone crossover filters in the lower stage.
From: Janeen Hazel Romie <romie_j@ligo.caltech.edu>
Working on Advanced LIGO schedule and costs for labor and materials.
Working on 40m Upgrade recosting for labor and materials.
From: Helena Armandula <ahelena@ligo.caltech.edu>
We are in the process of verifying the strength tester.
Bonded non cleaned substrates to test and compare with previous results.
Made several bonds to be sheer tested in house and at an outside lab.
"Loading" tests are still inconclusive.
From: Riccardo DeSalvo <desalvo@ligo.caltech.edu>
We are moving the meeting from Tuesday morning to Friday afternoon at
2:00.
Next meeting on Friday 6th of October.
Frederick
After extensive performance study chosen and bought Ansys, will
be good
both for fine elements and thermal properties simulations of suspensions
(ribbons, technofibers, etc.)
ChenYang,
studying electrostatic actuator.
Eugene,
Report on Peltier pumps. Impossible to find any Peltier and Thompson
coefficients at 4 Kelvin. No know how on superconducting Peltier
pumps.
Riccardo, Carlo, Gianni, Akiteru
Terminated suspension design, started production. In order to
save
time, instead of making a TAMA suspension prototype and then the two
final units, Carlo suggested to go directly to the production of the
two
units and then replace any part that was would need any change.
This
approach is riskier but would be much faster and with luck even cheaper
(two units instead of three and one machining cycle only). Akiteru
and
Riccardo accepted, will shoot for four weeks production time.
Riccardo
will delay going to Italy to take delivery of towers and Akiteru will
also go to take delivery of both systems at the same time.
Akiteru:, Virginio:
Bringing the inertial damping feedback at lower frequencies.
Alessandro
Assembled 4 accelerometers, testing, possible shipment to Pasadena
before the week end for Monday’s delivery.
Riccardo, Frederick:
After TAMA miniGAS springs, started first production for Kenji’s
pre-test.
Virginio, Akiteru:
Waiting for answer from Singapore for DSP chips. Purchase of
rest of
electronics on hold while waiting.
For additional information about this report, contact sanders@ligo.caltech.edu