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The LIGO Executive Committee Agenda for Monday March 12, 2001 will be:
(Meeting time: 10:30 am Pacific Time)
Open meeting 10:30 - 11:30
Special Items: NSF review report
no report
WBS 1.2 LIGO Operations--Administration
There was no site teleconference held on Thursday, March 8, 2001.
The next site telecon is scheduled for Thursday,
March 15, 2001. The list of current actions revised to reflect open
actions assigned through February 22, 2001 may be found at
ACTION
LIST.
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. . .
ACCOMPLISHMENTS
| Packages | Faxes | |
| In | 35 | 25 |
| Out | 25 | 35 |
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>
From: irena@ligo.caltech.edu (Irena Petrac)
Support (Wood)
Progress Period from 02.23 to 03.08
Accomplishments:
WBS 1.4.1.2 Project Controls (LIGO Construction)
We have received the funds ($19.1 million) from the NSF for FY 2001 Operations. We are working with the Office of Sponsored Research to set up the account budgets.
Prepared revisions for the Proposal Budget for the FY 2002-6 Operations Proposal in accordance with NSF request. Elizabeth has submitted these via FastLane.
A reminder that I require contributions for an end-of-February Quarterly Progress Report. I am requesting contributions by Friday, March 23rd. Thanks!
The following Change Requests have
been submitted:
| CR-000018 | WBS 1.1.4 | Curbing for Service Roads at Livingston | G. Stapfer |
| CR-000019 | WBS 1.2 | Additional Lab Equipment | D. Coyne |
| CR-000020 | WBS 1.1.4 | Staging Building and Renovations to Existing Building--Livigston | F. Asiri |
| CR-010001 | WBS 1.1.4 | Return of Unused Construction Budget To Contingency | F. Asiri |
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>
General Items:
--------------
(F. Raab)
Earthquake repair is the main activity as given in Doug Cook's report below:
Optics
------
D. Cook
Starting with some details
on the earthquake damage and recovery progress:
FMy-2k
lost one side magnet, it was removed from BSC8 and is now being
reprocessed in the optics lab. We expect to have
it balanced by late Friday
and into the vacuum bake oven on Saturday. The
Lower Left OSEM was found loose.
ITMy-2k
lost its lower left magnet, it was removed from BSC8 and is now
being processed in the optics lab. It has been
balanced and will go into
the vacuum bake oven on Saturday. All but the
lower left OSEMs were found
to be loose.
RM-2k
lost the lower left and lower right magnets, it was removed from
HAM9 and is being reprocessed in the optics lab.
We expect to have it
balanced and ready for the vacuum bake load mid
week.
The
ETMy-2k optic will be removed on Tuesday after venting late Monday
after the E3 run. It will be moved to the optics
lab for processing. We
have received the MMT3-2 spare optic from UFO
and have started the
processing it as well.
In general the recovery process is going good.
We are taking this
opportunity to retro-fit the new OSEMs. Hopefully
we will come up with a
modification to the 'safety stops' prior to reinstalling
the structures to
better protect. We will establish a new maximum
set point to gap the safety
stops. This is to restrict the amount the optic
can move during seismic
activity without interfering with the normal
controlled steering.
The
4k installation continues in parallel to the 2k. These tasks have been
only possible due to the efforts from large number
of people here at LHO
and many visitors.
Operations: All operators have been trained in the use of Ed
Daw's DMT program and will be exercising it during the E-3 and beyond.
All 5 remote RGA computers are now accessible from the control room. Quincy
is now training operators in its use for RGA monitoring. Szabi has given
operations personnel the E-3 checklist and special duties
to be performed during the E-3
OPTICS: We measured the PSL frequency noise with the laser free running, at the error point and using the mode cleaner as an analyzer. We also noted peaks in the free running spectrum that randomly appeared and disappeared at 66 kHz. We discovered a short in the ETMx LL coil. We measured the resistance at the hermetic 25 pin connector directly on the BSC. It appears that the short is in the coil. We also discovered last night that the ETMy LR coil has a problem, which appears to be a partial short reducing the coil resistance to ~4 ohms. During locked stretches we realigned both ETM transmission monitors. Packed and shipped to LHO all LLO CO and IO jigs and fixtures, and Gary Traylor be at LHO next week to assist. (Kovalik/King/Traylor/Kern)
Construction: The columns for crane support of the high bay area
have been set in concrete. Construction activities will continue Friday
and Monday overlapping the E3 run.
| Installation&
Commissioning:
Livingston |
Other Science/EngineeringActivities:
Issues/Concerns |
Seealso the Installation web page
A high priority continues to be finishing the installation of the 4 km vertex optics, since we will need to move cleanrooms to the 2k area before opening up too many doors there.
Processing of new OSEMs continues and so far seems to be on schedule to meet the requirements for 2 km retrofit. Ideas are being kicked around for improving the earthquake stops to minimize future risk of damage.
Gluing is starting on a replacement SM-02, because the one installed appears to have lost a magnet. Janeen has shipped up the SOS structures intended for the 40 m to allow us to make a more rapid swap (THANKS, ALAN!), and has ordered replacement SOS mechanical parts for the the 40m
The spare MMT-3 that was at UF was shipped to LLO. The radius of curvature (RC) was measured by imaging a target back on a screen immediately adjacent to the target. This mirror, MMT-305-1, has a RC of 25.02 +- 0.01 m. The design value is 25.160 but the MMT3 for the 4-k LHO IFO (MMT-302-1) is 25.03(5) +- 0.02 m. We will find the data for the MMT3 in the 2-k interferometer and adjust the location for mode matching.
Mode matching calculations indicate that a change in the RC of MMT3 by 10cm would reduce the mode matching to 80%. Any change in the RC of MMT3 has to be compensated by a change of the distance between MMT2 and MMT3.
If the RC change is dR, we have to change the distance between MMT2
and 3 by dR/2 by moving MMT3. To get the signs correct:
RC = 25.16 distance=13.78
RC = 25.06 distance=13.73
RC = 25.26 distance=13.83
No change in the distance between MMT1 and MMT2.
The change between MMT3 and PR is neglectable.
Because MMT3 is pretty immobile, we'll try to place it right when we know RC but after that corrections are made by moving MMT2. We checked this and found that one requires same changes in distance MMT2-MMT3 and these small changes in the distance between MMT2 and MMT1 do not matter.
Preparations for the E3 run include:
1) Use of the lock acquisition code on the single-cavity which typically acquires lock in 10-15 seconds.
2) Installation and test of two magnetometers and line voltage monitors for correlation with Hanford.
We have found coils in the ETM Y and ETM X
to be shorted but have learned how to control the masses with three coils,
allowing continued progress before it will be necessary to open to air.
Rich Abbott
Assisting in general electronics fixing and tweaking in preparation
for the E3 run at LLO. Diagnosed an offset problem with the PMC which
is behaving normally now. Took transfer functions in the LSC to diagnose
code and wiring issues.
During the last week or so, Joe, Jonathan and I have been re-working the alignment of the beam into the modecleaner, trying to improve the image of the reflected spot on the camera. Our conclusion was that the beam is being clipped somewhere inside the vacuum vessel, as the beam going into the modecleaner is definitely not clipped.
Rich and I inspected the pre-modecleaner servo to fix the DC offset problem observed when trying to lock the servo. A problem was found with one of the op-amps, exhibiting a large input offset. The op-amp was replaced and everything seems fine now.
Mohana Mageswara
I am finishing up the next revision MC Servo PCB layout, and it should
be send out for fabrication by early next week. I am also working on the
block diagram of the LSC photodetector readout module.
Peter Fritschel, Mike Zucker, Nergis Mavalvala, Rich Abbott, Rolf Bork,
Jay Heefner, Flavio Nocera, Rai Weiss, Matt Evans, Bill Kells, Mohana Mageswara,.....
We held a meeting to discuss the various patches that have been made
at LHO to achieve lock acquisition of the full interferometer. The outcome
was a set of specific plans to make permanent the various electronic setups
that have been cobbled together. Other resolutions: do more lab characterization
of the LSC photodetector saturation phenomenon and the electro-optic cell
alignment sensitivity; make another analog dewhitening filter board that
has less aggressive filtering than the present board, as a bootstrap during
the noise reduction process.
The new Pockels cell mount is still being fabbed by the Physics workshop.
I shipped up two AR-coated 10 in. diameter viewports to LHO (Doug Cook) for installation in front of a CCD camera - the location of which Mike Z knows.
The precision optical flats ordered from Thorlabs have arrived. These will be used for practising optical contacting.
Rick Karwoski, Paul Russell
· PSL custom boards -- The final 35.5 MHz Frequency Reference,
is currently in test. Once it is complete PMC boards will be available
for LASTI and the 40m.
· PSL Cross-connect panels -- The first cross connect panel
has been completed.
· Work continues in the intensity stabilization area. This week
Rick's efforts were back on the prototype circuitry for the main intensity
stabilization loop. The goal is to begin testing next week.
Ben Abbott
I have tested my latest DC photodiode design for use in the intensity
servo, and found that in INTUSOFT spice, it exceeds the design guidelines
given to me by Rick Karwoski.
Sander Liu
In the process of repairing and test of PMC 21.5 MHz Frequency Reference
Boards
Mike was worried about displacements of the magnet transverse to the
axis of the coil due to misglued magnets, misaligned OSEMs, mispositioned
OSEM brackets etc. I generalized an earlier axially symmetric calculation
to allow for this. It turns out that the sweet spot is comparably broad
in the transverse direction. Interestingly the force actually increases
for the few mm of displacement.
Working on redesigning the earthquake stops.
Peter Fritschel
Continuing osem assembly for the LHO 2k retrofit.
A new issue that has arisen is that the long osems installed on the side
of the optics have very little mechanical clearance, and in some cases
not enough to allow them to be positioned at the proper sensor point. So
we are making some modifications to the side osems to give more clearance:
grinding off the front part of the led/pd circuit boards, and installing
them so they stick out a bit from the osem form. Unfortunately in the first
batch of 5 such modified heads, the epoxy bond on the spring clip that
holds the filter in place failed. We are revising our handling procedures
to avoid this.
We completed the investigation of the broadband Pockels cell which began
the end of last week and we inferred its frequency response. With this
study, we ended the test cavity characterization. Comments to the LIGO
draft note, summarizing the characterization, have been received. Once
the
note is modified, it will be submitted to DCC.
Before opening the chamber, we cleaned and re-organized the lab. We
opened
the chamber, and we inspected the state of the optics. Two suspended
mirrors were found with one magnet broken off: one from the modecleaner,
the other from the south test cavity. These mirrors were taken out
of the
chamber and the magnets were reglued.
The laser was replaced by the one used for the photothermal experiment.
We
realigned the optics to the reference cavity, and we locked the new
laser
to the reference cavity for diagnostic purposes. A first estimate of
the
laser PZT efficiency gives ~5MHz/V, a factor ~8 greater than the old
laser.
Ken: completed design, solicited and received bids for fabrication of
custom BSC cleanroom with integrated work platform.
Mike: looking at schedule impact for BSC SEI support installation due
to domino effect from LHO earthquake damage. Experts (local, LHO, LLO)
previously signed up for April are no longer available. Pushing back
the BSC install does not directly impact the experimental program (LIGO
II BSC SEI delivery is still the "long pole") but may cause
interference with PSL commissioning and some logistic headaches; e.g.,
we'd prefer to put all that steel in its proper place ASAP, as we have
no floor space left.
David: working on detailed meshing of LSC LIGO II development programs
& test article deliveries with published LASTI test plan.
There was a meeting held last Friday about modeling. Andrea,
Biplab,
Hiro, Matt, Virginio attended. Hiro explained about the plan
of the
simulation effort proposed to NSF, for LIGO I and advanced LIGO.
In the
discussion, action items and priorities and schedules were discussed.
This will be revised by taking into account the feedbacks from
the
hardware expert people.
Andrea Vicere will provide part-time support to the simulation
group, spending that time
on use of the e2e for modeling work. He will lead an important
task for the modeling
utilizing his expertise as a scientist.
Physics Studies
---------------
(Hiro) Pursued the noise issues. An algorithm has been completed
to
calculate the psd of noises with a wide dynamic range. In order
to make
it possible, quadruple precision calculation needs to be adopted
in the
digital filter calculation, but the data being passed around
can be
double precision. So the e2e simulation can be built using double
precision as the main data type, and quad precision calculation
is used
in limited number of places. This introduces a minor speed penalty.
(Biplab) Some results from lock-acquisition studies: From observations
of various runs, the effects of the angular fluctuations of
different
mirrors (zero angular offset assumed) may be arranged in the
order from
most harmful to least harmful (in terms of percentage locked
time) as
follows (i) Beam-splitter (ii) Input mirrors (iii) Recycling
mirror
(iv) End mirrors.
If the ang. fluctuation level is low, these distinctions may
not arise
but their effects become prominent as the runs approach the
critical
cases of acquiring locks.
In the presence of angular offsets (with ang. fluctuations),
power
fluctuations in locked states increase to higher levels along
with a
drop in duration of locked states and an obvious drop
in locked state
power. More investigations going on.
The Code
--------
(Tavio) Expression template is a very powerful tool to combine
the
nice feature of C++ operator overloading and the speed achievable
by
fortran. By adopting expression template-based matrix and field
objects, our code becomes much cleaner and faster. Tavio
and Hiro
looked into several implementations, but the adoption in our
code will
not be completed by the time when the contract with Tavio ends,
so
the task for Tavio has been changed to revisit the profiling
of the
simulation code. This task has been defered for the time being
but will be revisited when resources permit.
This week's tasks are to profile the newest version of modeler
to see
where we take a performance hit, and to use the Sun performance
library's
LAPACK routines within our matrix class.
E2E at CACR
-----------
(Ed Maros) Worked on compiling e2e software on CACR supercomputer
systems.
With the aid of the staff, I have been able to compile the ALParser
library and am now working on the AdlibMM directory.
Alfi
----
(Bruce Sears) Alfi 4 Software Development:
- Completed testing of connection code. Found a few problems,
and
working on these Problem Reports (201 - 204).
* I am beginning to become involved in the simulation activity: Hiro
showed me the general architecture, the structure of the Han2k,
and
provided me with bibliography which I am reading.
* The participation to the E3 run required a telecon with R.Adhikari,
Biplab, L.Matone, and D.Brown at MIT. I am struggling to become
able
to use the tools here at the site, and to get involved in the
analysis activity.
* I shall be at Livingston from today (March 8) to March 17th, mostly
working on the frequency noise topic, although I hope also to
work on seismometer data, which may become useful later for
the
simulation.
Software Systems (Blackburn)
The 0.0.15 release of LDAS occurred on Tuesday of this week. This release is
now installed at Hanford and Livingston, as well as on the CIT-Test system.
It has added functionality and a few bug fixes needed for the E3 engineering
run. In particular, there is a new user command called dataPipeline used to
process frame data through the dataConditionAPI and store such results as
power spectra, cross spectral densities and statistics in the site databases.
Philip Charlton has been developing driver scripts based on this new user
command which will be used to automate the process of recording detector
characterizations on select channels which he as collaborated with Keith
Riles and the dataConditionAPI team in order to make a solid contribution
to the E3 with LDAS.The upgrade to LDAS 0.0.15 and the use of the new user command have also
identified several limitations in the database table design. A new table
called summ_csd which stores information from channel x channel cross
spectral densities was added. In addition several columns were lengthened.
These table changed lead LDAS to perform its first complex database
administration task: dumping the existing tables (old design) and the
merge this data into the new table design. The only data effected by this
was the trigger data at Hanford. When this DBA exercise was attempted,
16179 out of the 248202 triggers failed to migrate. An investigation into
this has turned up that this is a common problem with DB2 and we will be
re-ingesting the original XML files associated with these triggers after
the format has been modified to reflect the new table design. Longer term,
we are looking at third party solutions to this migration problem and hope
that IBM will provide a patch.The usual set of test occupied much of the week as we prepared for the
release. However, we did discover a processing bottleneck when concatenating
large number of frame channel data to form a long timeseries. Already a few
places in the code that can facilitate the data flow have been identified
but it may be a couple of weeks before these are fully optimized.A schedule was formulated for the software development over the next two
months which will include two new releases of LDAS (roughly one a month)
and will carry the software into the Inspiral Inch Peeple in mid May.The first attempt at performing load balancing using a shared object from
UWM (base on the new wrapperAPI model) was unsuccessful due to a MPI blocking
call. The source of this problem has not been fully tracked down yet.Some coding effort went into the new LDAS API (eventMonitorAPI) this week.
A shared library for submitting events to the database was started and the
data bucket used to store the data products from the search codes was begun.
Hardware Systems (Anderson)
E3 related activities
---------------------1) The tapecontrol script has been modified to write data onto tape in
parallel with creating the next tar ball of data from the framebuilder.
This has increased the rate that data can be archived to 6.0+ MB/s. The
system has been tested for several weeks at LHO and LLO without errors,
and is ready for E3.2) The tapecontrol documentation has been upgraded for E3. The relevant
parties have been informed of their duties during the run. To
summarize:
a) operators should go through the following checklist at the beginning
of each shift,
http://apex.ligo-wa.caltech.edu/~gmendell/tapecontrolchecklist.html
b) the configuration of tapes in the tape robot during E3 is located at,
http://apex.ligo-wa.caltech.edu/~gmendell/tapecontrolsign.html
c) the complete documentation on how to start and use the ldas control
GUI and tapecontrol software is found here,
http://apex.ligo-wa.caltech.edu/~gmendell/tapecontroldoc.html3) More vetting of the user's configuration of the tapecontrol script
was added, and other minor bugs were fixed, to make the script more
friendly when archiving data e.g., from the RDS writer on fortress.4) A performance test of the DMT with the tapecontrol script running
was conducted. The test showed that cpu usage was not significantly
impacted.Long term activities
--------------------1) LHO: Contractors working with Richard McCarthy finished installing power
for the upcoming move of LDAS from the mass storage room to the
mezzanine of the staging building.2) Optional 240V electrical requirements for the 28TB of LDAS disk have been
determined and will probably be adopted at LHO, LLO and CIT, but not MIT.3) A new dual-processor Sun server (E220R) has been ordered as the
main LDAS software server.4) Updated quotes for the LDAS Engineering run beowulf clusters have been
obtained (1 dual, 1 quad, and 16 uni-processor boxes for LHO and LLO).5) The first official LDAS version of RedHat Linux has been specified, i.e.,
there is now an explicitly maintained set of RPM's to apply to a base RedHat
installation to obtain a standard LDAS configuration.6) Initial testing of the second Red Hat 7.1 beta are proceeding (wolverine).
[Bruce Sears]
* (BS) Ilog maintenance, additions, and development:
- LLO Ilog moving to a different
machine.
- Addition of a new group
at LHO.
- Developing better search
feature accessibility.
MIT:
(Keith)
-Traced NFS mail trouble down to solaris NFS version
inconsistencies (2.6 / 2.8).
-Built new print server (using HP Jetdirect).
-Installed various software packages for users.
-Continuing to install patches when time permits and machines
become available.
Hanford:
See Hanford Report
Livingston:
-Preparing for E3 run setting up and testing equipment.
-Preparing for LSC setting up equipment and working on
logistics.
CIT:
(Barbara)
- Worked on the to-do list for the LDAS Equipment database and web
forms.
Thus far have set up a web form to create a new entry based on a previous
one and have added an edit for the Cost field. Once the remaining
items
are completed, the changes will be installed in production.
- Reworked the web form for reserving a document number so the author
pull-down is at the bottom of the page. Folks will no longer
have to wait
for the pull-down to load before entering data (do we need the
pull-down?).
I am also working on a web form to search the log for reserved
but unused
document numbers.
- Updated the LSC meeting announcement web page and posted the February
newsletter. Made a number of other changes to LSC rosters and
transparencies, LIGO Participation, etc.
- The text versions of the DCC database are now available at
admdbsrv.ligo.caltech.edu/dcc/doclists.html
-- a public URL that is not
posted.
- My schedule next week is to work Monday at home and Tuesday-Friday
at
Caltech so that I can post the LSC transparencies. We still haven't
gotten
our router working and DLink Technical Support hasn't been responsive.
Maybe Larry can give me some pointers when he returns from Livingston.
(Lisa)
- Tweaked the daily/weekly backup scripts on hamal. Moved the backup
of
ldas-sw
to its own tape. It now gets a level 0 dump every Saturday.
- Decommissioned Rastaban as the server for daily/weekly backup scripts.
- Did monthly backups.
- Did a survey of the computers on the 2d and 3d floor of West Bridge.
We
have
5 offices without computers. I currently am working on getting
4 up there
(2
sun, 2 pc).
- Working on a new round of surplus equipment with Ed.
- I tested and labelled every phone line in the modem pool area.
We have
one
line in particular that is very poor.
- Moved the 800 number to the new modem. The old modem pool is
still
active but
with only 2 local phone numbers.
- Got the PO for the Cadence license renewal to purchasing.
- Got some competitive bids for AIT-2 tapes.
- Worked on the usual round of printer/desktop support issues.
(Suresh)
-Installed Matlab Release 12 in sirius. This can be invoked by typing
matlab12
in command line on any Sun System. Also, the documentation for it has
been
installed. The old version of Matlab (Release 11) is still in place
whose
license will expire in March 31. Then release 12 will be the default.
-Contacted HP support service to replace the broken plastic paper sensor
in
bottom tray of HP Laserjet 5000 N printer in third floor bridge. They
are
sending repair technician very soon. Fixed the duplex printing problem
of
HP
ColorJet printer in third floor bridge. Working on resolving the unix
postscript
file printing problem of HP LaserJet 5000 N printer in Millikan 6th
floor.
-Received the 10db attenuator to be used with single mode ATM uplink
module in
ES 2810 Fore switch. I will be doing testing in next couple of days.
-Doing necessary preparation for moving home3 and home4 in 36 GB drive
in
Sun
Storage D1000.
(Sam)
-I came to work to answer modem questions, but there wasn't any.
-Dealt with a gateway return issue.
-Answered some random pc questions
From Peter King:
40m Lab and LASTI PSL
---------------------
A number of optical mounting components arrived from New Focus and
Thorlabs. Most of the optics from CVI Laser have arrived, only some
beamsplitters and quarter waveplates remain.
The gimbal/beamsplitter mirror mount support blocks are still in the
process of being fabbed by the Physics workshop. These should be completed
by week's end, as the lathe being used is required for another lengthy
job.
Date: Sat, 03 Mar 2001 10:08:47 +0900
From: Riccardo DeSalvo <desalvo@ligo.caltech.edu>
Fred (Lyon)
Demonstrator drawing of sapphire flex joints sent to manufactures.
Let
see the price. Suggested start wiyh with one or two of the 7 geometries
designed.
Flex joint simulation, making drawing and simulation for one dimensional
and 2 dimensionnal Flex joints. (static for a joint and dynamic for
a
long wire with Flex joints at the extremities). For the thermal
simulation, will see next week.
Initial calculation to optimize the length of Flex joints.
Collecting informations on
Sapphire quality factor measurement and modelling
Cluster ion beam
Ceramics machining
Edwin (Pasadena)
ran some hardness measurements on some of the TAMA-SAS filter
attachments.
Calculating some basic energy dissipation methods on the attachment
system, only considers mechanical potential energy and some frictional
factors.
Need Giancarlo Cella’s help to learn some of the calculations and
simulations of this type of anti-spring.
Continued to understand the experimental set-up for the Creep.
Alessandro (Pisa)
Mechanical machining of accelerometers terminated.
Found some information on how flex joint Q-factors may be degraded
by
EDM. We will make the accelerometers for TAMA the old way but will
use
the spares for testing a new scheme and a re-hardening process to
restore the original Q-factors.
Accelerometer’s electronics waiting for a component already procured
in
Caltech and presently in transit over the Atlantic. Otherwise
ready for
shipment to Japan.
Roberto Taddei
All digital electronics and NIM and VME crates ready for shipment except
for a DAC chip very late in delivery, now promised for Monday or
Tuesday.
Shipping crates already built, will ship asap.
Akiteru, Riccardo, Yamamoto, Kimio (Tokyo)
The SAS towers, installed last week in the three meter vacuum chambers,
were completely aligned and secured (specially made screws were
necessary.
Prepared ballast masses for final loading.
Found problem with mirror and recoil mass wires (wrong tensile strength
listed on a web data sheet). Assemblying with backup tungsten
wires.
New wires on order will arrive in few days.
Dry run of a completed double pendulum suspension procedure successfully
completed. All modes, checked by un-calibrated, but trained,
eyeball
mark-one sensors, looked OK.
Suspensions and mirror frozen in position by their shipment struts.
The
resulting structure is as sturdy as expected.
Frozen the Tower 1 again with its shipment blocks.
The frozen double pendulum was moved into tower 1 and hang in position.
Everything went OK, no wire was damaged. No positioning seems lost.
Akiteru stepped back, looked at it and made a famous comment:
"MHM. . ., it looks as in the drawings!"
No further comments necessary, I guess.
The shipment struts are so solid that we are convinced that the entire
structure (SAS+SUS) could have safely air travelled.
Note, when we will get to it, it will be useful to take advantage of
the
re- frozen structure stiffness to perform the cabling, then the
components will be released progressively starting from the bottom,
ballasted and balanced as necessary until the tower is ready for
operation.
The latest photos are located at:
http://www.ligo.caltech.edu/~takamori/images/tamasas/installation2/
Met at KEK with:
Colin Taylor, Miyoki, Kuroda (from Kashiwa) and Sato, Suzuki, Shintomi
and Tomaru (from KEK) to discuss installation of SAS on the KEK
cryostat.
Inspected the Hall, found the possibility to reduce the spacing between
the two vacuum chambers and reduce vertical occupation, for the rest
there is sufficient space and crane access for the job.
For additional information about this report, contact sanders@ligo.caltech.edu