The LIGO Executive Committee meeting for April 18, 2005 is
cancelled due to the LIGO Laboratory Staffing Committee meeting.
No report.
LSC MOUs and Research Plans and Progress Reports
For a web page summary showing the status of LSC MOUs and associated Attachment updates see: http://www.ligo.caltech.edu/~irena/Revstatus/Reviewstat.doc
A site teleconference was held on Thursday, April 14, 2005. The following items were among those discussed:
>From: Ed Chargois <chargois_e@ligo.caltech.edu>
>From: Linda Turner - turner@ligo.caltech.edu>
>From: Cleveland Mak <mak_c@ligo.caltech.edu>
>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>
>From: irena@ligo.caltech.edu (Irena Petrac)
>From: Ed Jasnow <jasnow@ligo.caltech.edu>
>Irene Baldon
>From: Julie Hiroto <jhiroto@ligo.caltech.edu>
>Dorothy Lloyd
The Annual Report for the Visitors Program is basically complete and entered into FastLane ready to “push the button.”
A proposed draft has been distributed for outlines for the Annual Report for Operations and a Proposal for an Extension for FY 2007 and FY 2008. Some comments have been returned. We will begin working these documents pretty furiously between now and August 1.
The DCC Steering Committee participated in demonstrations of two different systems on Wednesday (April 13, 2005).
DocuWare presented the first system. This system runs on a Windows 2000 Server (SQL). The code is in escrow (this is insurance against the company going out of business). The system demonstrated seems designed for a much more secure and inward looking environment that that which we need. Does not support immediate distribution of a fixed URL pointer to a document. Viewing can be done from any browser.
The second system was presented by Synergy. This system runs on a Microsoft Windows SQL 2000 Server. The only browser certified is Internet Explorer, which could be a serious issue for us. Several on the committee will test other browsers. Other than that, the system seemed pretty slick.
We want to set up two more demos and are considering next Wednesday (April 20th) at 8 am and 1 pm.
>From: Cindy Akutagawa <cindy@ligo.caltech.edu>
>From: Bill Tyler tyler@ligo.caltech.edu
· Nothing significant to report for Safety and QA.
Summary of Commissioning
Activities at LIGO
Absorption and g-factor measurements were the order of the day, for most of the
week, on the 4k. Site-wide, 4k and 2k-related elog
highlights are bulleted below:
4K IFO
2K IFO
L1 Interferometer (Frolov)
---------------------------------------------------------------------
The interferometer input
power increase and the coil driver upgrade reported last week yielded improved
interferometer noise performance. The power into the interferometer was
increased by more than a factor of two from the S4 level. The best inspiral range is close to 9 Mpc
now.
There was finally evidence
seen of thermal distortion from the main 1064 nm beam at the maximum input
power of 4.6 W (incident on the mode cleaner). Heating power from the 10.6
micron thermal compensation system was reduced by about a factor of two to
accommodate this.
Work on the frequency
stabilization servo continued this week. The fss bandwidth
is still not up to the designed value with the new laser (300 kHz vs 500 kHz).
Education and Outreach
(Thacker)
---------------------------------------------------------------------
2 outreach programs were
provided this week
SURF student list for this
summer has been finalized
Concept of a Local Educator's
Network has received excellent support from teachers contacted to date. 1st
meeting tentatively set for May 21st.
We supported a LA DOE teacher
training workshop on at risk students. (support
included facilities + introduction by me on what LIGO is and does).
Site Safety and Security (Riesen)
---------------------------------------------------------------------
1. Updated all laser user
signage.
2. Issued 6 replacement swipe
cards (defective cards).
3. Qualified Hartmut Grote (GEO) as an LLO
Laser Operator.
4. Ordered traffic sign for
auditorium parking and auditorium location.
5. During site walk through
found no laser safety concerns. Found trip hazard conditions at the X-end,
Y-end, corner station CDS rack room, and LVEA (TCS areas, HAM 2 area, and
ISCT-4 area). The optics lab and the mechanical room had chemicals that are not
stored properly. I am in process of contacting the responsible people.
6. The Y-end experimental lab
is ready for cleanup and relocation of the equipment to the corner. This area
has not been active for some time as it interferes with interferometer
operations; the tests previously sited here will be relocated to other site lab
spaces and resurrected.
7. Conducting an in-house
property audit (will be on-going for at least 2 weeks).
8. Work is continuing on the
5 malfunctioning site security cameras.
9. We are gathering, sorting,
and containing our chemical and solid waste for
future disposal.
LLO Mechanical Engineering (Spjeld)
---------------------------------------------------------------------
AdL Quad SUS Installation Fixtures
-
Completing re-design; design review meeting scheduled for 4/25
-
FEA of all components approx. 80% complete
- Will start on machine drawings after
design review
AdL SEI Engineering Effort
-
Machine and assembly drawings of blade pre-load tooling complete
-
Additional tooling documentation in progress
LLO Outreach Facility
Pendulum Exhibit Wall
-
Received quote from Cardinal Aluminum
-
Completed model with pendulum load carrying, bearings and shafts
-
Preliminary design of lock-down mechanism complete
-
FEA of components in progress
-
Provided architect with pendulum mass and moment estimates
-
Awaiting attachment interface design from architect
General Engineering
-
Attempting to convert SolidWorks models of BSC to 3DS
files for NSF movie
LLO General Computing and
LIGO Computing Security (Roddy)
---------------------------------------------------------------------
-Helped John Thacker with
Norton Ghost on setting up backups.
-Reinstalling a Windows
laptop for Allen Sibley
-Working on getting
subscribed to various security mailing lists
-Spoke with CDS candidate
Matt Rippa.
-Finished setting up a few
more machines on CDS to log to the central Syslog
server.
-Working with Syskonnect still on the bad fiber card for the new
firewall, and ordered a 4 port Cu Gbit card.
-Ordered a UPS for the lab
rack. Working with Rus and
Bernie on a power source for it.
-Looking into some software
that Mike Pedraza told me about for Windows patch
management for both CDS and GC.
-Still looking into RBAC and
BSM - allows extremely fine grained control and replacement for su/sudo.
-Working with Caltech on a
licensing issue and also getting more software from them under the CIT
licensing.
HPLF, Optics Modeling, Data
Analysis and L1 Commissioning (Franzen)
---------------------------------------------------------------------
1) HPLF news: Mike Zucker visited IPG Photonics (April 11) in order to
investigate how the 100 W laser repair is progressing. He was told that IPG has
redesigned and assembled the laser and that IPG now believes it is going to
work without any more failures with the output wavelength still at 1064 nm. The
seven day burn-in test had just started during Mike's visit (14 hours) and the
engineers also said that they plan to ship it in approximately two weeks if
everything works out. Rusyl W. and Rich R. have been
designing and installing a over-temperature interlock
system in the HPLF which will prevent the laser from running if the room
temperature exceeds a certain set point. This is basically to exclude any
further questions regarding insufficient cooling of the laser being the cause
of any future failures.
2) Since my migration from
Red Hat to Fedora Core 3 a few weeks ago I have encountered some serious compability problems between matlab
and femlab running on FC3, both required for my
melody AdvLIGO MC simulation
work. I am desperately trying different approaches in order to get back on
track, but we might have to get another femlab
subscription or even worse pay for Red Hat Enterprise.
CDS software (Khan)
---------------------------------------------------------------------
1) Upgraded three Sun
workstation to Solaris 9 operating system.
2) Helped
LDAS/Condor Sysadmin and Burst Analysis (Yakushin)
---------------------------------------------------------------------
Data archiving/Condor/LDAS:
The condor nodes were down
for half a day on Tuesday for AC work.
Data analysis:
1) On
reviewers' request computed std values for table VI in S2 burst paper
(central time and frequency reconstruction of hardware injections). Noticed
that some signs in the table got changed somewhere along the editing process.
2) On Erik's request, took a
closer look at how well S4 hardware injection properties (central time,
frequency, hrss) were
reconstructed by waveburst online high threshold
analysis:
http://ldas-pcdev1.ligo.caltech.edu/~igor/S4HWINJ/index.html
Noticed that there is
obviously a time delay introduced between the sites (I was not aware of that
and thought that triple coincidence injections were done exactly at the same time
at all the sites). Peter confirmed that was really the case:
http://www.lsc-group.phys.uwm.edu/cgi-bin/bag-enote.pl?nb=
burs4simulations&page=9
3) Working with John and
Sergey to put waveburst into DMT CVS (the most
important part of it, WAT, was already in DMT repository, however,
postproduction scripts, online and offline scripts were not) in preparation for
the waveburst review.
see also the CDS weekly meeting
minutes in the commissioning
archives
no report
Fiber Optic Timing Link (Sander)
==================================
- 40 M parts are ready to install.We
have 4 receivers that will be installed in the LSC, ETMX, ETMY and vertex
suspension crates. When more receivers are completed we will install the
remainder of the system. Receivers are required for IOO front end, 2 more
vertex SUS frontends, ASC and PEM ADCU crates. The
PEM ADCU crate is optional.
- Installation will begin today and testing will begin next
week when the serial data analyzer is received.
no report
PeterKing
In the news, Lightwave Electronics
was recently acquired by JDS Uniphase.
A new Pockels cell mount was drawn
up after taking into account the experience obtained from last week's trip to
LLO. It avoids having to find the right height pedestals ... etc.
Lee Cardenas, Liyuan Zhang
OTF Lab. (W. Bridge) No Change
Cavity # 1
This chamber still locked with two samples, white Ceramabond,
and disks of TRA-BOND #2254
color light brown epoxy. Cavity is clean. We are waiting on new mirrors
to be tested for contamination.
Absorption Test Measurement prototype in
standby.
Scatterometer system
in progress
We have made a complete new alignment of the entire optical train
after installation of a new beam
splitter and introduced a pin holes
and beam have been collimated. More precise mode
match done.
We have installed an integrating-sphere to collect the scattering beams
from the mirror. So far,we have checked a
1.00"inch 70ppm mirror and took
the scan and it give us a total beam scattering
of ~ 22 uv(microvolts) in
the Lock-in-amplifier which represents
~ 4 ppm of scattering loss. This is the best
for this mirror and
this is our base of scattering loss.
We have installed the fused silica 2ITM04 in the scatterometer
and so far it reads ~75uv(microvolts)
of scattering loss.
We have received a new HEPA unit which will be installed ASAP
on top of the scatterometer enclosure.
The Quantronix 60 watt laser is shut
down.
OTF Lab at Lauritsen ROOM 38
Cavity #3
The contamination test for (20) pieces of Glenair Micro-D-connectors
still in progress.
Cavity is locked and we are taking measurements for
absorption and ring down
for contamination loss every day. So far so good.
The small vacuum pump is leaking oil from the oil chamber gasket seal.
Cavity #2 in standby.
Progress continues, slowly
but surely, on the bond-noise experiment. We have a number of projects "in
the pipeline," but for most of them we are waiting on samples.
Excess Pier Motion (Mittleman,
Ruet)
After
removing all of the stack springs and most of the mass (Myron and Lee) we remeasured the "pier amplification" and found
that it was the same as with the stack installed.
There is an entry in the Lasti ilog (4/7/05) showing the
first results and an entry (4/13/05) detailing the stack removal procedure.
We are continueing
to explore the detailied resaons
for the noise enhancement and possible solutions
LASTI Infrastructure (Mason, Ottaway
and Ruet)
Completed the design and
placed on order the solid stack. Modifications were made to fasten the l4-c
geophones during testing of the quad controls prototype.
Given the
situation with the vacuum bake ovens in LIGO Lab. It was decided that this solid spacer will be airbaked by a commercial vendor and can serve as a path finder for this technique being used for
Advanced LIGO Seismic.
-----------------------------------
Data Analysis Activities (
-----------------------------------
Weinstein:
- Working with Lisa Goggin and Duncan on S4 ringdown
search.
- Read and commented on
near-final S2 BNS paper.
- Read and commented on
near-final S2 PBH paper.
- Reviewing S2 BBH papers,
talks, and elog pages.
Mendell:
Ihave been working with
Virginia Re and Joe Betzwieser to understand how the
analytic formulas for the StackSlide power given in StackSlideHoughStatistics.pdf (aka
LIGO-T050003-00-W) compare with the actual measured power. It has been
found that the analytics formulas can over-estimated the power by 10-15%.
These are derived from the approximation that the signal has constant amplitude
and frequency during the duration of one SFT (typically 1800 s), and this
approximation is the source of the discrepancy. The code has been
validated by showing that it does go to the correct SFT frequency bin for a
given template, and thus is indeed working properly. A report on this
will be given to the CW/pulsar group. I have also added an important
option to the code that provides an easy way to validate that the code is
checking the correct bins for the power. The updated code has been
checked into LALapps under the lalapps/src/pulsar/StackSlide
directory.
Shawhan:
* Spent a lot of time
catching up with the email which arrived while I was on vacation last week...
* Reviewed pulsar analyses
and presentations to be given at the APS Meeting.
* Someadditional
editing of the S2 untriggered burst search paper
based on comments from reviewers.
Yakushin:
1) On
reviewers' request computed std values for table VI in S2 burst paper
(central time and frequency reconstruction of hardware injections). Noticed
that some signs in the table got changed somewhere along the editing process.
2) On Erik's request, took a
closer look at how well S4 hardware injection properties (central time,
frequency, hrss) were
reconstructed by waveburst online high threshold
analysis:
http://ldas-pcdev1.ligo.caltech.edu/~igor/S4HWINJ/index.html
Noticed that there is
obviously a time delay introduced between the sites (I was not aware of that
and thought that triple coincidence injections were done exactly at the same
time at all the sites). Peter confirmed that was really the case:
http://www.lsc-group.phys.uwm.edu/cgi-bin/bag-enote.pl?nb=burs4simulations&page=9
3) Working with John and
Sergey to put waveburst into DMT CVS (the most
important part of it, WAT, was already in DMT repository, however,
postproduction scripts, online and offline scripts were not) in preparation for
the waveburst review.
--------------------------------
Simulation and Modeling (Bhawal)
--------------------------------
Weekly E2E Physics Meeting
---------------------------
Sany Yoshida presented results he got after implementing
Violin modes (based on Virginio's model) in e2e last
week. There was also discussion about proper way of mode matching of input beam
to SimLIGO. Mark Barton talked about "Adding
Violin Modes to the Mathematica Pendulum
Models". Viewgraphs of both presentations are available at:
http://www.ligo.caltech.edu/~e2e/ME2ET/Minutes05/050414/
Mode matching in LHO and LLO
---------------------------------------------
(Hiro)
The following physics were studied and was reported at the weekly commissioning
meeting. (G050229)
(1) effect
of the replacement of the ITMx at LHO4k
(2) differences
using different input beams at LLO (A) matches with the arm when ITM is cold
and (B) matches with the arm when ITM is hot.
As a follow-up
calculation, various overlapping of Carrier and Sidebands are calculated and
circulated in the commissioning group. Also, FFT results together with a match
script is provided so that results can be calculated which are not provided in
the summary table being circulated.
Mechanical simulation
----------------------------
(Mark Barton) This week I
added basic support for violin modes to my Mathematica
AdvLIGO triple and quad pendulum models. To
approximate the continuous distribution of mass in the wires, I used 5 beads,
each of mass 1/5 that of the whole wire, separated by 6 massless
wire segments, each of compliance 1/6 that of the whole wire. (The number 5
came from advice by Virginio Sannibale
and is the minimum required to model the first 3 violin modes with tolerable
accuracy. The number is hardwired into the model, but can be changed easily
enough by cutting and pasting some fairly formulaic code.) To avoid introducing
longitudinal modes, each bead was geometrically constrained to move on a plane
at right angles to the vector between the endpoints of the wire as a whole. To
keep the number of degrees of freedom manageable, I only applied this treatment
to the final 4 wires supporting the optic. This produces 4 wires x 5 beads x 2
axes = 40 new DOFs, for a total of 58 for the triple
and 64 for the quad.
As one would hope, the
augmented model reproduces the low-frequency modes exactly but now has
moderately realistic violin modes. The predicted frequencies are quite close to
reality: about 10% low for the first three harmonics (although rather worse for
the top two). This is about as much development as needs to be done for the
purposes of use in E2E. For completeness it would be nice to implement damping
properly, but this will require new features to be added to the modelling toolkit, to allow different damping at the each
end of a wire element.
Simulation of 40 meter
Interferometer
------------------------------------------------
(Monica) Finesse confirmed
Twiddle results about discrepancies of minor signals between e2e and Twiddle.
Those discrepancies were still there after the e2e simulation of the
Dual-Recycled Michelson Interferometer (just the central part of the IFO, no
arms): so there is something wrong in the simulation or just in the computation
of minor signals. To check if discrepancies come from the use of the PSD (Power
Spectral Density) module, analysis of the time series data obtained with e2e
has been done with a Matlab program implemented by Virginio to calculate transfer functions. The main signals
have been recovered while minor signals show a different behavior with respect
to e2e. The Matlab program will be checked again as
up to now is still noisy.
Future implementation
of the radiation pressure in the e2e 40m model to evaluate the effects of
optical springs.
Dual recycling summation
cavity module
-----------------------------------------------
(Hiro)
C++ version is being developed based on the previous calculation (T040062).
State Space implementation in
modeler
-------------------------------------------
(Hiro)
The speed has been dramatically improved and a system with violin modes can be
simulated faster than real time. Right now, LIGO simulation runs 100 times
slower than real time due to the optics calculation, so this state space module
speed is no problem. Mark Barton found a case suggesting a bug of the code, and
it is being traced
.
Alfi
----------------
(Bruce) - Finished node
validation for the checking for and simple navigation to unresolved
connections.
- Working on speed issues in the updating of connection widget data types on
various bundle related user actions.
(Melody) Continuing
on fixing existing Problem Reports. Currently working
on the user interface for allowing the user to choose the display for primitive
nodes: graphic or text.
---------------------------------
LDAS Software Systems (
---------------------------------
Corrected
the CRC checksum calculation for pre-Version6 frames. This fixes an
issue seen with FrVerify. It is being fully tested
and should be available early next week.
Worked on
generating MD5 sum values (PR2751).
The core of the code is in place. More time is needed for testing and
debugging. This code should also be available early next week.
Added new
user (Igor) to the GDS CVS repository.
Added E12 and S4 time ranges
to the controlMonitorAPI's client for one click
selection per PR2810 request. Started working on the request to have a single
button in the controlMonitorAPI's client that would
allow all user commands to be tested at once per PR 2812.
Ran LDAS
integration and system tests on LDAS version 1.5.38. and noticed that the lsync test is failing in a non-deterministic way that
has not been seen before.
Added new
regression test to merge RDS frames from differing processing paths as part of
the fix for PR 2807. Began working
on a test to verify that the default compression level is now "one"
instead of "six".
TCLGLOBUS
Worked on Globus FTP Client third party transfer functionalities. MIT GSIFTP server (ldas.mit.edu) is refusing a
connection request to pull the file from ldas-cit.ligo.caltech.edu. Need more
investigation.
Worked on completing test cases for Globus
I/O and FTP Client functions.
OSG GRIDS
Responded
to inquiry from OSG operation group regarding LIGO's
migration plans for moving onto the OSG GRID, in particular the plans for migrating
iVDGL Grid3 hardware onto OSG. This was
coordinated with the LSC Computer Committee.
-------------------------------------
LDAS System Administration (
-------------------------------------
Caltech
-------
(Dan Kozak)
* Verified that the list of
S4 frame files in LDR at CIT exactly matches what is in /archive/frames/S4.
* At LHO,
dealt with /archive filling up because A4 data was not configured to be
archived to tape. Part of the fun here involved figuring out how to get
the releaser to work again (it had given up trying). umount /archive + mount /archive seems to have done
the trick.
* Still trying to figure out
the discrepencies between the data holdings of the
CIT nodes vs. ldas-gridmon's LDR and RLS.
* Created outstanding grid
accounts. Worked on improving script to do this.
* Converted lag plot to PDT.
(Phil Ehrens)
* PR#2807 - createRDS command should not restrict GEO frame file names
to follow a LIGO convention in order to merge. I extended the cresteRDS command to make use of the more general -framequery syntax used by other frame API user commands.
This makes it possible to specify ifo/type/channel
sets in combinations not possible heretofore. CLOSED.
* PR#2800 - createRDS -compression level default should be 1. CLOSED.
* PR#2791 - getFrameData and concatFrameData
data should support compression. Investigated problem and discovered that C++
layer work is required in order to implement this. Passed the
ball back to Ed Maros. OPEN.
* PR#2788 - The output action
should support creating frames with compression enabled. No mechanism
exists to do this at present. The C++ layer of the datacond
API will need to be modified, as will the frame API C++ layer, before any Tcl code can be written in the interest of solving this PR.
* Replaced some disk drives
in the cluster and test systems.
* Ongoing investigation of
use of grid proxy certificate objects for Subversion certificate
authentication.
* Minor user support for
Subversion repository.
(Stuart Anderson)
* Continued testing on
SAM-QFS 4.3 which resulted in SUN fixing a slow queue management algorithm.
* Received and installed 2
test 10Gigabit Ethernet cards in a Quad Opteron
Solaris 10 machine.
* Various cluster maintenance
tasks.
* Intalled
matlab V6 and V7 in a standard location on all the
Lab clusters.
* Upgraded Ganglia to version
3.0.1.
MIT
---
(Keith Bayer)
* Switched matlab license file to point locally.
* Added several more
accounts.
* Updated packages (via yum)
on ldas-pcdev1 so that matlab will run.
* Started thinking about
tearing down the rack in NW17-037 which includes the DMT Sun boxes (lancelot/enoki) and the grape cluster.
* getting quote from ASA for
another pcraid (seems easiest thing to do for testing
NFS) - we'll need another one soon anyways. Probably
more than that for S5.
----------
(Igor Yakushin)
* The condor nodes were down
for half a day on Tuesday for AC work.
-------
(Ben Johnson)
* The room came close to
overheating this past weekend, which resulted in the manual shutdown of 2 full
node racks. The ultimate cause appears to have been worn and very loose fan
belts on both Liebert air conditioners. The room now
has adequate cooling.
* The /archive filesystem filled up because I failed to add the A4
directories to the archiver.cmd file. This may have
precipitated an OOM condition on gateway on Sunday. The system has now
recovered and is currently working.
* One of the nodes failed to
power up after the air conditioners were fixed. I am presently investigating.
---------------------------
General Computing (Wallace)
---------------------------
MIT:
(Keith)
-Requested new ip address for highbay pc
-Patched windows computers
-Continuing to investigate
LDAP when time permits
(
-Helped John Thacker with
Norton Ghost on setting up backups.
-Reinstalling a Windows
laptop for Allen Sibley
-Working on getting
subscribed to various security mailing lists
-Spoke with CDS candidate
Matt Rippa.
-Finished setting up a few
more machines on CDS to log to the central Syslog
server.
-Working with Syskonnect still on the bad fiber card for the new
firewall, and ordered a 4 port Cu Gbit card.
-Ordered a UPS for the lab
rack. Working with Rus and
Bernie on a power source for it.
-Looking into some software
that Mike Pedraza told me about for Windows patch
management for both CDS and GC.
-Still looking into RBAC and
BSM - allows extremely fine grained control and replacement for su/sudo.
-Working with Caltech on a
licensing issue and also getting more software from them under the CIT
licensing.
(Christine)
CIT:
(Mike)
-Out sick half the week.
-NTSRV's:
Ghosted all NTSRV's for end of month backups.
-Loaded 2000 Server for
George Stokes to run Apache web server to replace (Antares)
this is an on going project.
-Work a little with Ares
corp. working out some licensing issues for the PRISM software.
-Holding down the fort while
Larry is out this week attending a conference.
-Misc. onsite/phone user
support.
(Veronica)
- LIGO: Videotaped and
compressed software presentations for the DCC. The streams are posted
online. The 1.5+ hr presentations were too big to fit onto a DVD.
Loaded the security patches
onto the Windows servers.
Updated the
PAC18 website.
Working with Julie on website
updates for Barry.
Troubleshoot the DCC search
engine. Mike and I ran a diagnostic utility and were able to bring it
back up with minimal downtime.
Working on
moving the Amaldi3 conference website to ligo.org. Rewriting the original ASP so
that they can run on an Apache server.
Preparing
high-resolution images for a Smithsonian publication.
Updates to
various webpages.
- LSC: Posted a batch
of updates to the page for papers under review.
Posted a
page for the elections of LSC representatives.
Updated the
roster database, assisted Irena in LSC mailing lists and roster
database-related issues.
Posted late submissions to
the March meeting talks webpage.
(Larry)
-Made a number of minor
purchases. A couple of USB pocket drives have been ordered. They have become a
little more popular for backing up the notebook computers.
-Worked on a number of
accounts. This includes adding and removal. Also cleaned off
the data of a couple of old accounts.
-Assisted Irena in resolving
a LSC database access problem. There was a communication issue between her PC
and the application.
-Spent more time testing the
modem pool. Still appears to have some problems but the change made at SBC has
definitely improved the situation.
-Builta
portable tape unit. We can now restore 4MM and 8MM tapes using the same box. It
was built from a number of left-over items including a unit supplied by PMA.
Also, spent
a couple of hours restoring data for different people.
-Continual work with the spam
filters.
Mail Statistics April 7-13,
05
Accepted Mail 22,232
Rejected Mail 12,788
Virus Mail
4,853
False Positives
157
Total Mail 35,020
No report this week.
From: Ken Mason
<kmason@ligo.mit.edu>
SEI Structure:
We have received the hardware ordered by ASI prior to the contract close out.
This includes all parts for the spring calibration fixture. Myron has
inventoried the parts and has begun assembly of the calibration fixture.
Ed Jasnow has verified with the maraging
steel supplier that the slab on reserve is large enough to accommodate an increase
in the blade spring width.
From: Janeen Romie <romie_j@ligo.caltech.edu>
Advanced LIGO Suspensions
Working on the detail drawings for the tablecloth
assembly.
Participated in Justin's Gray Areas meeting on Tuesday
concerning outstanding issues for the DRR.
From: Ken mailand
<kmailand@ligo.caltech.edu>
I have worked with
The Grieve Co. quote is ~$12,500. for 48x48x72 size,
~two other quotes pending.
We have received 4’” S.Stl. stock for the
lower suspension installation arm fabrication.
I have started the detailing of the component arm parts, and making a list of
the purchased parts, bearings etc.
From: ctorrie <ctorrie@ligo.caltech.edu>
ADVANCED LIGO SUSPENSIONS
Lower Structure
I have been working with Russell on the lower structure. The face plates
are with a local machine shop, via Mike Gerfen, for
quote. The final detailing of the drawings will be completed by tomorrow. I
hope to have the quote today. we are still planning on
2 structures
Overall Assembly
The interface between the upper structure and the suspension and the
interface between the lower structure and the upper structure has been
completed. (This involved 3 groups) Russell and I found a few interface related
issues. These have been discussed with RAL and the rest of the group and the
drawings have either been updated or will in due course.
LIGO Movie
Nothing to report
Workshop
There have been some delays this week as both of the RAL engineers have
been on vacation and several questions came up about their parts. Tim is now
back and these should hopefully be resolved by tomorrow.
Assembly Tooling
I have been working on a series of parts that will help us assembly the
quad here at Caltech. These are now with Ric in the
Physics Shop.
These will be needed for both the "dirty" and "clean" build
planned for Caltech.
PDMWorks and SolidWorks
Yesterday I met with Bob Weber, with the Palomar Observatory group at
Caltech, to talk about PDMWorks and SoildWorks. We exchanged observations and Bob showed me how
they are using their vault. We agreed to meet again in a month or so. Mike Perreur-Lloyd is setting up a vault and SolidWorks
suite for LISA in the
Design Meeting
http://www.ligo.caltech.edu/~ctorrie/QUAD_ETM/quad_etm_setup_page2.html
From: Helena Armandula
<ahelena@ligo.caltech.edu>
No report this week
From: Peter King pking@ligo.caltech.edu
No report this week
From: Michael Smith <smith@ligo.caltech.edu>
ADV LIGO
BS DIFFRACTION LOSS
I have modeled the BS in ZEMAX and have preliminary results for
the geometric and diffraction losses of the input beam from the power recycling
mirror (PM) through both arms to the ETMs; and the
geometric and diffraction losses for the injected beam from the signal
recycling mirror (SM) through both arms to the ETMs.
I have almost completed modeling the range of BS parameters with thickness
varying between 50 to 72 mm, and diameter varying between 350 to 400 mm.
Preliminary results for the ADVLIGO baseline; t = 60 mm, D =
350 mm are shown below for 1W power input ( the model
assumes that the PM input beam enters and exits symmetrically about the
centerline of the BS, this gives maximum input into the arms of the IFO):
geometric diffracted total
PM transmitted
arm 1.74E-4 45E-6 2.19E-4
PM reflected
arm 0.90E-4 25E-6 1.15E-4
PM both
arms 2.64E-4 70E-6 3.34E-4
diffracted power loss is approx.
1/4 of geometric power loss
SM transmitted
arm 1.37E-3 2.34E-4 1.60E-3
SM reflected
arm 0.67E-3 1.29E-4 0.795E-3
SM both
arms 2.03E-3 3.63E-4 2.40E-3
diffracted power loss is approx.
1/5 of geometric power loss
From: Riccardo DeSalvo desalvo@ligo.caltech.edu
Marco & Juri
Received the Mexican
Hat mirrors from LMA Lyon
Redesigning input
beam for MH interferometer: we have studied the laser
profile getting the beam waist and its astigmatism.
We also found a
rough deviation from the ideal diffraction-limited
gaussian beam
described by a m-square factor sensibly greater than
1.
Marco designed a new
telescope to fix astigmatism and mode match our FP
with spherical end mirror (f=400mm instead of
200).
Creep experiment:
still taking measurements at 40 degrees. Position
pretty stable
Alessandro Cacciani, visitor from Universita’ Roma I
at this stage of my stay I am still gathering
information from different people to see how to contribute to LIGO. In addition
to Riccardo, I am in touch with Peter King, Bill Kats,and, particularly with the
groups of the 40m Interferometer (Rana Adhikari) and Data Analysis (Alberto Lazzarini
and Rejean Dupuis). Presently, I am reading the
documents these two last groups have provided.
On top of the above
I am preparing a seminar on Solar Gravitational Red Shift measurement.
Riccardo
Measuring
performance of IP legs for OMC SAS.
For additional information about this report, contact S. Whitcomb or P. Lindquist