The LIGO Executive Committee Agenda for Monday January 10, 2005 will be:
(Meeting time: 10:30 am Pacific Time)
Special Items:
no report
STATUS OF LSC MOUs
(Petrac)
(Weekly update on the status of
LSC MOUs and Research Plans and Progress Reports, and non-LSC MOUs)
California State University of Dominguez Hills
EGO
GEO 600
Shanghai Institute of
Optics and Fine Mechanics (SIOM)
Southern University and
VIRGO
Notes:
SITE
TELECONFERENCE (Lindquist)
A site teleconference was held on
Thursday, January 6. The following issues were discussed:
PROPERTY
MANAGEMENT (Chargois)
>From: Ed Chargois
<chargois_e@ligo.caltech.edu>
>From: Linda Turner -
turner@ligo.caltech.edu>
>From: Cleveland Mak <mak_c@ligo.caltech.edu>
COST
SCHEDULE CONTROL SYSTEMS (Cunningham, Brambila, Kaufman, Salone)
>From: Esther Cunningham
<esther@ligo.caltech.edu>
>From: "Brambila,
Ruth" <Ruth.Brambila@caltech.edu>
>From: Gina Salone
<gsalone@ligo.caltech.edu>
>From: Florence Kaufman
<fkaufman@ligo.caltech.edu>
SUBCONTRACTS
MANAGEMENT (Petrac, Jasnow)
>From: irena@ligo.caltech.edu
(Irena Petrac)
>From: Ed Jasnow
<jasnow@ligo.caltech.edu>
SUPPORT
(Baldon, Kammerling, Lloyd)
>Irene Baldon
>Sharon Kammerling
>Dorothy Lloyd
PROPOSALS
and REPORTS (Lindquist)
Nothing new to report.
CHANGE
CONTROL/CONTINGENCY MANAGEMENT (Lindquist)
HUMAN
RESOURCES (Akutagawa)
>From: Cindy Akutagawa
<cindy@ligo.caltech.edu>
Quality/Safety
(
>From: Bill Tyler
<tyler@ligo.caltech.edu>
The annual safety audits of LIGO (Caltech) campus labs are now underway. As
of mid-December, six labs had been audited, with two more (40M and DeSalvo
labs) scheduled for audits during 2004. Generally, the labs that have
been audited, appear to be well managed and are practicing appropriate safety
methods and procedures. However, there is still a need to improve
"house-keeping" activities in a few areas. Remaining unaudited
LIGO labs, will be audited early during 2005.
Summary of Commissioning Activities at
LIGO
4k high power locking, ISS work, DAQ and WFS mods were typical activities over
the holiday break. The 4k ran with a remarkable duty cycle of 80% during
this quiet period, higher than any science run.
Some commisioning highlights from the past week are bulleted below (please see
the elog for more holiday entries):
4K IFO
2K IFO
DAQ
---------------------------------------------------------------------
completed Education and
Outreach APS abstract for April meeting of APS
Safety and Security (Riesen)
---------------------------------------------------------------------
no report
L1 Commissioning (Frolov)
---------------------------------------------------------------------
Most of the interferometer
activities this week were related to the electronics and DAQ system. The ETM
coil drivers were modified to reduce the noise from the feedback resistor.
While measuring the transfer functions of the coil drivers the digital
cross-talk in the DAQ readout and missing readbacks were found on some
channels. On channels without digital problems the new coil driver transfer
function was found to be properly compensated by the digital filter. The
debugging of the electronics for additional low noise AS port photo
detectors continued. The problem with epics control of the whitening gain was
found to be in the epics database. Rolf is working at the site this week on the
LSC and HEPI processor and code upgrade. The awg output driver has been
reinstalled in the new electronics room. It was one of the last items to be
moved from the LVEA as part of the EMI retrofit. This will enable the ISS and
FSS excitations from the dtt.
L1/HEPI Commissioning
(O'Reilly & Shyang)
---------------------------------------------------------------------
In an effort to avoid tilt
coupling problems in the HAMs we have changed to a non-blended, position sensor
only loop configuration. Shyang Wen designed and installed new filters over the
weekend and has been taking data for Sensor Correction since. The up and down
scripts have been modified as has the HEPI status. The new approach appears to
work quite well for the Y direction, but unfortunately the tilt problem remains
in X. We are now attempting to compensate for this term and to fit a corrected
transfer function. This idea follows from work by Rich Mittelman at LASTI. One
difference between LLO and LASTI is in the mount position of the witness
sensors used to take Sensor Correction data. We may want to explore mounting
ours in a similar fashion.
L1 and AdL Mechanical
Engineering (Spjeld)
---------------------------------------------------------------------
working on the HAM door
removal lifting fixture; hoping to have quotable drawings within 1-2 weeks
working on the AdL Quad
Suspension Installation Tooling; review meeting scheduled for Jan. 11
working on a information
database for the recycled hydraulic servo valves for HEPI
received four of six new
hydraulic servo valves for HEPI; eight valves sent to LASTI
participated in cost/labor
review meeting for the AdL SEI on Wednesday 1/5
General Computing (Roddy)
---------------------------------------------------------------------
Still investigating the
bandwidth issues of our WAN connection. Using a server in Nicholson Hall
(Physics building on campus) I ran some bandwidth tests. Since this
computer should be gigabit all the way through to the LLO LAN, I expected to
see reasonable bandwidth. However, the numbers were very similar to what we see
when testing the connection to CIT. It is still a bit of a mystery.
Wrapping up the configuration
and burn in of the CDS GigE switches.
Looking into prioritizing the
firewall rules to see if I can improve the bandwidth issues for LDAS.
High Power Laser Facility,
Optics Modeling and L1 Commissioning (Franzen)
---------------------------------------------------------------------
Rupal Amin and myself have
received, installed and tested the table enclosure obtained from
Just before the holidays the
RTP crystal exploded after being exposed to 93 W during one week. This occurred
when the power was being ramped up after a test. We believe that the the
explosion was caused by either the power being ramped up too fast or that I did
not align the crystal correctly after a small accidental misalignment which
occurred during the test. We have received a new RTP sample and are now
preparing for another RTP long term test.
LDAS/Condor Sysadmin and
Burst Analysis (Yakushin)
---------------------------------------------------------------------
Condor/LDAS admin:
1) Installed second hard
drives into 70 nodes. Several data cables were too short to handle two
drives so I had to buy some extra cables.
2) Installed SysKonnect GigE
card into gateway. Have not yet finished configuring it.
CDS software (Khan)
---------------------------------------------------------------------
1) Coordinated with Chathen
for the work in progress he was invloved with.
2) Working with Rolf to
upgrade the LLO timing system; including awg setup that has been moved from the
mass storage room to the highbay area. Upgraded the l1lscl0, l1lscex and
l1lscey system from VxWorks to Linux.
3) Prepared a sitemap that displays the LIGO daq channel
mapping system on an medm screen.
see also the CDS weekly meeting minutes in the commissioning archives:
Rolf Bork reporting
At
LLO this week:
- Replaced the LSC CPU with a new 2.2GHz processor running Linux.
- Lost reflected memory (RFM) network to EY yesterday. Found two problems: bad
fiber in MSR and poor fiber connection at EY patch panel. Along with fixing the
total loss of comms with EY, the latter also appears to have fixed the excessive
CRC checksum errors seen on HEPI1 and HEPI2 by the Framebuilders for some
time. Over the past sixteen hours, no CRC errors have been detected, whereas,
in the past, several hundred would have been detected over the same time period.
- Today, we plan to move the AWG from the mass storage room into a rack in the
high bay. This will allow analog outputs to be run to the PSL. Given some IFO
downtime, I also plan to install one of the new 2.2GHz processors into an ETM
controller and verify that it works properly. LHO is waiting on this test prior
to installing their units.
Rich Abbott reporting
no report
PeterKing
Two
intensity stabilisation servos were assembled, tested and shipped
Ken Mailand, Lee Cardenas
A total of 6 TCS CO2 Laser cooling system assemblies have been completed & shipped to the observatories. We have two complete assembled chillers left. These are waiting to be shipped. We have completely cleared and cleaned the area where the assembly took place. We left a nice flat table for future chiller assembly in the area and the rest of the spare parts has been put into storage ready to be used if needed.
[Note by Dennis: There is some thought that we might want to use the TCS quiet chiller design for the PSLs rather than than the noisier commercial fluid/air chiller units. This is a possible post-S4 task.]
Helena Armandula
Generated specification sheets, sent out for quotes and received REO quote for higher quality ISC table optics requested by Daniel Sigg and Peter Fritschel.
Lee Cardenas, Liyuan Zhang
OTF
Lab. (W. Bridge)
This chamber has two samples, white Ceramabond, and disks of TRA-BOND #2254
color light brown epoxy. Cavity still locked.
The test has been completed and reported as "clean" samples.
This chamber will be refurbished completely as to change optics and better
mounts and translation stages. The vacuum pump will go through a complete
restoration(oil change, new fittings, filters ...)
Absorption Test Measurement prototype -- in standby
Scatterometer system -- in progress
The Inner test mass 2ITM04 fused silica mirror is in the scatterometer
enclosure.
beam scattering test on this ITM completed. The results are the same as
previous.
The scanning of the integrated scanning sphere to
detect all the scattering beam from the mirror surface has been completed.
The fabrication of a mount to hold END TEST MASS BLANK
(40 meter) of ~ 4.92" in dia. by 53mm in thickness is on waiting.
The Quantronix 60 watt laser -- in
recovery
We have recovered the chiller cooling system.
We'll be testing the laser and making proper
alignment for the absorption test measurements.
OTF Lab at Lauritsen ROOM 38
Cavity #3
The contamination test for (6) new disks of VAC SEAL Epoxy samples
is in progress. Cavity is locked and we are taking measurements for
absorption
and ring down for contamination loss every day.
so far we can tell that the samples are clean since the measurements are almost
the same before the samples went in.
Cavity #2 -- in standby
no report
no report
Simulation and Modeling (Bhawal)
E2E Physics Meeting
------------------------
Dominic Joseph Dubois and
Sany Yoshida from Southern Louisianna University presented their results for
the effects of the motion of Mode-Matching Telescopes on the interferometer.
DARM offset
--------------------
(Hiro) For H1
interferometer, it was found in both experiment and simulation, that the higher
order modes force the DARM dof off by 10^-12 m from the locked length using
only 00 mode. For L1, a similar offset is observed in data. Because the two
arms of L1 is much better matched than H1, the dependence of this offset on the
thermal compensation can be different. This is being investigated using e2e and
FFT.
Phase camera Analysis
-----------------------
(Biplab) Studied using
SimLIGO, how the modal content of the dark port output changes in time and how
well the phase camera images taken at this port with 1 sec scan time can
capture this information.
FFT study
---------------
(Hiro) Application of the
locking mechanism of LIGO Length Sensing and Control in the FFT simulation has
been looked into more carefully. The locking done so far seems to be not
enough, i.e., some error signals are still too large, and a better procedure
needs to be identified. This is necessary to quantify the effect of the
thermal deformation in the locked IFO.
Simulation of 40meter
interferometer
-----------------------------------------
(Monica) PSD measurements of
inphase and quadrature phase signals in different configurations: moving the
Mach-Zehnder steering mirror or one or more mirrors of the main interferometer
core optics.
Dual Recycling Michelson
(DRM) coding
---------------------------------------
(Hiro) I have started the
coding of C++ version of the DRM fast simulation, which will be used in e2e for
adv.LIGO.
Alfi
---------
(Bruce) - Misc. bundle work.
(2.0 days)
Data Analysis Activities
(Lazzarini)
Brown:
- Worked on finishing MACHO
paper for LSC review.
- Reviewing an LSC technical
paper for Peter Saulson.
- Working on a project to
look at quasicircular post-Newtonian inspiral with Scott Hughes.
- Helped Stuart sort out some
grid issues on ldas-cit and helped the tapir numerical relativity group get
grid credentials.
Mandic:
Iworked with Joe Romano on
completing the stochastic analysis for the H2L1 pair, for both Hann and Tukey
cases.
I performed
I made a rough comparison of
classical and Bayesian confidence intervals for the S3 stochastic analysis. I
also worked on some cross-checks of the S3 results.
Mendell:
Reported on comparisons of
Hough Number Counts from the StackSlide and Hough codes at the Dec 21, 2004 and
Jan 04, 2005 PULG telecons. The codes agree within a 2-5% error and studies are
underway to determine if this is due to remaining bugs or a real difference due
to the two different algorithms used to find the number count (each of which
introduces unique rounding errors). Comparisons with PowerFlux continue, as
well as unit testing of the StackSlide code. The goal now is to have
preliminary S3 results from the StackSlide code by Feb 1, 2005 for the Feb 2-5
PULG F2F meeting, hopefully for direct comparison with Hough and
PowerFlux. Scripts for generating a pipeline of condor jobs (a DAG) to
produce upper limit estimates have been completed and will be checked into the
lalapps/src/pulsar/StackSlide cvs archive today. (Previously, various
steps in the pipeline had to be run by hand.)
Shawhan (over the last few
weeks):
* Attended the Gravitational
Wave Data Analysis Workshop (GWDAW) in
* Took part in a day-long
review of the pulsar F-Stat analyses in
* Edited/polished the S2
LIGO-only burst search paper.
* Continuedstudying
frequentist coverage properties of analysis procedures which allow a post-hoc
veto, using Matlab simulations.
* Constructed several lists
of data quality flags for the E11 run. Also did the bookkeeping to make
E11 available remotely using 'getFrames'.
* Maintained conlog software,
adding it to the CDS CVS repository and reconciling differences between the two
sites. Also made a work-around for client connection problems at
* Walked Vuk through the
hardware signal injection software, which needs to be resurrected for the
E12/S4 runs.
Sutton:
The big news since last week
is that I finished and released a complete draft of the LIGO-TAMA un-triggered
bursts search paper for S2/DT8. I'm now waiting for feedback from TAMA
and the bursts group. Otherwise, I'm back working on some long-dormant
projects, namely the characterization of the space of GWBs detectable by LIGO
(the "cheese"), and studying variants of the Gursel-Tinto technique
for solving the inverse problem for GWBs. Thanks to Chatterji providing
some filters, I am also about ready to make some TFClusters triggers for
Willems to use in his Barkhausen noise test.
Chatterji:
Generated single detector S3
playground triggers using the Q pipeline applied to gravitational-wave and
microphone channels. Potential airplane events are being investigated to
observe their effect in the gravitational-wave channel.
Investigating extensions to
the loudest event statistic (mth loudest event, multiple tuning parameters) for
setting upper limits in future burst searches.
Working on corrections and
upgrades to LPEFilter DMT class.
Lazzarini:
Learning about maximum entropy
Bayesian techniques for application to sky map generation from raw data
(stochastic GW background) and possibly certain aspects of burst detection
(using maxEnt as a smoothness constraint on, e.g., Tinto-Gursel algorithm to
limit minima of solutions).
LIGO Data Analysis Systems
Software Systems (
LDAS:
Spent much of the past few
weeks porting LDAS software over to the Fedora Core 3 Linux OS. This has not
been as transparent a process as hoped given the Redhat origins of FC3.
However, we have been able to run LDAS on a tandem system (combination of one
Sun server and one Linux server) without too many concerns. We are now in the
process of configuring the LDAS-DEV system to run with the FC3 OS. This will
allow a more thorough investigation of the stability and thread safety of FC3
once the configuration changes by the system administrators is completed.
An issue with the building of
the tar-ball distributions of LDAS under Fedora Core 3 was discovered and fixed
this week. It required upgrading the automake/autoconfig toolset along with
some changes to our scripts.
The SINSTALL script's rule
sets were upgraded to support building LDCG and LDAS on Fedora Core 3 systems
this week.
cmonClient - working on PR
2765 - problem with listing directories: found bug in displaying large status
message into status window caused cmonClient to use 99% CPU and unable to
refresh properly. Directory listing with blt tree works very fast. Will convert
to use blt tree to manage table data for PRs related to tables in cmonClient.
Documentation: updated
documentation for installation of DB2 8.1.5 on Fedora Core 3.
Testing: ran ldas System for
version 1.3.35. cvs test results.
Other - ran pipeloops on
tandem-ii and tandem-iii for comparison between RH9 and Fedora Core 3. Finished
major system tests for Fedora Core 3. Installed DB2 8.1 on new dev metaserver
(Peter Shawhan):
The new persistent socket
connection feature in the LDAS manager API was debugged on the dev system, and
a copy of guild was successfully modified to make use of this feature.
Updated versions of guild and other client software in LIGOtools will be
released along with the next release of LDAS.
TCL/Globus:
Completed SWIG wrapping of
basic data type (int, double, string) support for globus_xio_attr_cntl(),
globus_xio_handle_cntl(), globus_xio_data_descriptor_cntl() and
globus_xio_server_cntl(). Now, we are able to use XIO with GSI driver
successfully.
Still need to support pointer
and callback datatype. We're still working on this problem.
Wrote the TCL test programs
for TCP and UDP and tested that we can modify the default XIO and GSI driver
attributes.
Working on Latex instructions
on how to use TclGlobus test suites.
GRID3/OSG:
Researching the various
sofware needed to become a GRID3 site and am currently learning the
installation instructions for the same. Discussed internally the pros and cons
of joining GRID3 Production versus Development. The general opinion at this
time is that we should join the development GRID3 to bring us closer to the
environment for OSG. Some continued discussion on this is likely. Stuart is
planning to have two servers available to us for GRID3 gatekeepers once the
existing gatekeepers for the LSC Computing Grid are upgraded.
Hardware Systems (
Caltech
-------
(Dan Kozak)
* Validating postS3 LHO data
shipped on tape to CIT.
* Working on getting 1% data
moving again via LDR and trying to craft a more generic storage module (despite
not knowing Python :-).
* Consulted with Ben on LHO
/frames reconfiguration.
* Put in request for new LLO
framebuilder QFS license.
* Put old /archive samfsdumps
from olddataserver-cit into SAM-QFS.
* Staged frame files for
restore of node9.
(Phil Ehrens)
* Continued work on patch.tcl
ssh based remote system administration tool.
* Added concurrent
asynchronous run mode to scancluster, making it possible to run long-running
tasks on cluster nodes and collect data as it is available instead of looping
through the nodes sequentially. This has been tested and debugged and is now
usable .
* PR #2760 - Fixed incorrect
API free memory calculation in LDAS module genericAPI.tcl
(Al Wilson)
* Setting up fedora for the
new nodes on cit
* installing fedora on the
ldas-dev system
(Stuart Anderson)
* Worked on restoring node9
data after failed disk drive.
* Finished benchmarking the
new Cisco cluster Ethernet switch.
* Additional testing of
NFS/QFS combination and problem ticket with Sun.
* Helped upgrade LDAS-DEV to
Fedora Core 3.
MIT
---
(Keith Bayer)
* Worked on heat/power
numbers for ldas lab.
----------
(Igor Yakushin)
* Installed second hard
drives into 70 nodes. Several data cables were too short to handle two
drives so I had to buy some extra cables.
* Installed SysKonnect GigE card
into gateway. Have not yet finished configuring it.
-------
(Ben Johnson)
* Generation of .md5 sum
files started on 12/30/2004.
* /frames has been
"grown" by 3.8 TB (8 T3s). All old data has been preserved, and new
data is being written to all 16 T3s.
* /frames has also been
mounted on the cluster nodes (remounted after "grow"). SAMFS mount
parameters have been adjusted on gateway as well to aid the NFS transfers.
* New and improved LDR
publishing code is progressing, and should be ready by Tuesday or Wednesday of
next week.
General Computing (Wallace)
Lazzarini: Working with
Roddy, Narker and others to have a kickoff meeting at LHO sometime in January
regarding identifying, discussing, planning and eventual implementation of the
Observatory Critical Security System modifications
.
MIT:
(Keith)
-Rebuilding wireless router
with failed harddrive
-Made several software orders
-Investigated trouble with
duplicate IP address on network
-Investigated windows encryption
software for Marie (winpt) which has GnuPG embedded in it - useful for simple
symmetric key encryption of sensitive files etc.
-Looked into DVD burn
troubles on desktop pc
(
-Still investigating the
bandwidth issues of our WAN connection. Using a server in Nicholson Hall
(Physics building on campus) I ran some bandwidth tests. Since this
computer should be gigabit all the way through to the LLO LAN, I expected to
see reasonable bandwidth. However, the numbers were very similar to what we see
when testing the connection to CIT. It is still a bit of a mystery.
-Wrapping up the
configuration and burn in of the CDS GigE switches.
-Looking into prioritizing
the firewall rules to see if I can improve the bandwidth issues for LDAS.
(Christine)
- Network usage can be seen
at
http://www.ligo-wa.caltech.edu/~christin/mrtg/
198.129.208.1_198.129.78.122.html
- Created accounts and setup
a computer for a temp who was sitting in for a few days while Terry Gunter was
away.
- Continuing to monitor the
Cisco network switches and router following a network slow down that occurred
just before the holidays. No indication what caused the problem, but
cycling power on the main network switch "fixed" the problem.
- Helpeda couple of users
with ssh and e-mail setup problems on their home computers. The e-mail
server SSH was set to require reverse DNS mapping for incoming
connections. Some ISPs in the area do not have reverse mapped IP
addresses. The requirement on the e-mail server has been removed for
now. Created several web pages with detailed instructions for setting up
ssh and e-mail software to use ssh tunneling.
- Created a couple new user
accounts, maintenance on a couple other user accounts. Moved several user
accounts from a full disk to an unused disk. Corrected some problems with
e-mail addresses that occurred because of moving the user accounts.
- Took care ofstuck backups
from 1/1/05. For some reason the rewind command from the server to the
tape drive failed and was unable to restart itself.
- Followed up on a lost order
from Sun. Renewed the support contracts for several software packages.
- Upgrading the software on
the application license server. Installed the latest patches, and several
software specific patches and libraries. Will be upgrading this computer
to Solaris 9 in the next few weeks.
- Setting up a new PC for a
user.
- Other misc. user support.
CIT:
(Mike)
-Todd Etzel: loadeda new
computer for him, with all General Computing software plus a few engineering
packages. Plus transferred over his old data to his new workstation.
-Loaner Pool: Reloaded a
laptop for the loaner pool.
-NTSRV's: I worked on
LLPDMWORKS and PICTOR, updating patches and troubleshot some hardware errors.
On PC 72 IIS ended up getting corrupted; I had to restore from a ghost image.
This webserver is back up and running.
-I have been continuing to
work with Larry on the Spam filters, searching for false positives.
-Worked with Larry, cleaning
up old user accounts that are know longer being used.
-Ran the monthly ghost
backups on all NTSRV's.
-Other misc. onsite/phone
user support.
(Veronica)
- LIGO: Updates to the
website. Finished/installed Aspen05 website. Windows server
maintenance: Scheduled backups and security audits. Image processing per
several requests from publishers and other user support.
- LSC: Website updates
and user support.
- CaJAGWR: Website
updates and user support.
(Larry)
-Placed a couple of orders
for the LDAS group.
-Working outsome license
issues. We finally received information on the IDEAS license and it looks like
we will be purchasing a new license for LIGO. Installed the updated mathematica
license. Distributed a couple of Matlab licenses, just as a note we do have the
CD's for the Rev14 service pack 1 of Matlab.
-We were able toremove over
200 accounts from the system. We still have some minor items to clean off and
another group of accounts to check for removal. However, this has been a good
start and has cleaned up a few items.
-Ran the first set of monthly
backups. Another set will be run so a set of tapes can be sent to a off-site
storage location.
-Reset the E2E servers. They
are still having some timing problems causing them to lock up. Will switch over
to a cron job to reset the clocks on a regular basis.
-Worked a number ofWEB
issues. Most dealt with the automount table not working properly on the web
server.
-Assisted a number of users
with different issues. Covering the spectrum from e-mail on PC's to hardware
issues on the SUN boxes.
-Worked with Mike on the spam
filters and resetting of the e-mail services.
E-mail statistics Dec 16, 04
- Jan 5, 05:
Rejected
Mail 33,185
Virus
2,494
False
Positive 457
Accepted 25,706
Total
Mail 58,891
Adv. LIGO Systems
Dennis Coyne
See
also the AL
Systems web page
See also the RODA
status web page
No changes since the last weekly report
· As part of an effort to establish optimal
beamsplitter optic dimensions, performed some calculations of coating strain
induced change to the radius of curvature and compared to experimental results.
A report to follow soon.
·In reviewing
the AL optical
layout to check Mike Smith's observation that the BS pick-off beam appears
be insufficiently separated from the main beam, have found that the physical
distance to place the pickoff mirror in front of the ITM was not taken into
account. This and other minor corrections will be incorporated into a pending
revision. The revision will take into account the COC material selection choice
to be made very soon.
See Mike Smith's AOS weekly report for consequence on BS wedge angle.
· Calculated
the stresses on the BSC chamber flange for a large articulated installation arm
(T040234). This
preliminary analysis serves to verify that the interface torque/load is not too
high. Further design and analysis (by Ken Mailand) is required to determine if
this concept for an installation jig is truly feasible.
·With advice
from Joe Giaime, I'm revisiting the coupled dynamics model of the
SEI/BSC-SUS/quad with the intent of calculating modal transfer functions with
reasonable levels of cross-coupling to determine if the interaction is
siginificant from a controls standpoint. Plan to have results for the 1/13 SEI
critical review.
· Working
with the SEI team to prepare for the upcoming Critical Reviews (1st
scheduled for 1/13 is focused on cost/schedule, 2nd in mid-Feb
focused on ETF results). A revised cost estimate for the AL SEI BSC prototype
and the production phase has been made and is being scrubbed.
Advanced LIGO Project Management
from Carol Wilkinson (wilkinson@ligo-wa.caltech.edu)
Seismic Critical Review
Preparations are underway for the seismic critical review
teleconference on January 14. This review is an interim status review to verify
that the BSC seismic isolation design and development is on track to produce a
LASTI prototype and, ultimately, production units that meet performance
requirements as well as proposed costs and schedules. A subcommittee met this
week to review costs for prototype and production units.
Progress reporting
The next progress update is due February 4 and will include
progress from December 1 through January 31.
(NOTE: Thomas Frey will be out of the office from
Progress Period from 01.03 to 01.07
Accomplishments:
COST BOOK DATABASE:
Changes to estimates for AOS and IO will be pursured starting next week
--
Suspension
From: Janeen Romie <romie_j@ligo.caltech.edu>
From:
Peter King <pking@ligo.caltech.edu>
Most of the monthly lasers telecon was taken up by
discussion of the conceptual design document. At the moment the plan is
to hold the conceptual design review at the time of the Spring LSC
Meeting. The document is scheduled to be assembled mid-January.
After a mis-hap with the high power laser --- a dust
particle was burnt onto one of the optics --- the laser was re-assembled and
its output power is back up to 175 W. A round of measurements is
scheduled to take place in either January or February.
I calculated the minimum wedge angle of the BS that produces a 0 mm separation
distance and the base-line wedge angle for a separation of 30mm between the
main beam and the BS PO beam at the location of the BS PO mirror @ the 100 ppm
diameter of the beams.
0 mm separation
BS wedge
ITM wedge
30 mm separation
BS wedge
ITM wedge
From:
Riccardo DeSalvo <desalvo@ligo.caltech.edu>
Marco
I finished the PC design for the PZTs driver circuit and the list of needed
components, sent for production at PC express, ordering most components.
In the Mex-Hat interferometer, I moved the feedback photodiode behind the folder
mirror and now Im studying the new feedback stability and the cavity alignment.
Taking data for the creep experiment at the temperature of 1200C.
Riccardo
Draft OMC seismic attenuation design advances. The descriptive report and the
design drawings, both still in evolution, can be found in: http://www.ligo.caltech.edu/~desalvo/HAM-SAS.doc
<http://www.ligo.caltech.edu/%7Edesalvo/HAM-SAS.doc> for
the report and http://www.ligo.caltech.edu/~desalvo/HAM-SAS <http://www.ligo.caltech.edu/%7Edesalvo/HAM-SAS>
for the drawings.
For
additional information about this report, contact whitcomb_s@ligo.caltech.edu