There
will be no LIGO Executive Committee scheduled Monday, August 14, 2006 due to the
meetings of the LIGO Scientific Collaboration scheduled in
On 8-9 August, the LSC held its annual MOU Review Panel meeting at MIT. The conveners were Peter Saulson, Albert Lazzarini, and Szabi Marka, with intensive support by Dot Lloyd. The Panel read and commented on Progress Reports and MOU revisions from all LSC (non-Lab) member groups. It also discussed the report on Lab Research, and used that as a springboard for discussing some issues concerning the overall research program of the LSC. A group-by-group report was prepared at the meeting. After final scrubbing, individuual sections will be shared with the groups' PI's.
>From: Rod Luna <rluna@ligo.caltech.edu>
>From: Linda Turner - turner@ligo.caltech.edu>
>From: Cleveland Mak <mak_c@ligo.caltech.edu>
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>From: "Funaro, Catherine" <Catherine.Funaro@caltech.edu>
>From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>
>From: Florence Kaufman <fkaufman>
>From: Gina Salone <gsalone@ligo.caltech.edu>
>From: Ed Jasnow <jasnow@ligo.caltech.edu>
The monthly report for LIGO Operations for the end of July has been submitted to the NSF.
>From: Cindy Akutagawa <cindy@ligo.caltech.edu>
>From: Bill Tyler tyler@ligo.caltech.edu
Nothing significant to report this week.
Duty cycles for the LHO machines this week (Tue Aug/01 to Mon Aug/07) were:
H1 90.9 percent, H2 92.5 percent. This is the first time in a long time that
the 7-day average of both of the IFOs reached 90
percent. Seems like
the stability of the H1 got better by the replacement of the PMC.
H1 AWG, which is hosting excitations as well as the test point manager for
H1, continued to be unstable (for example look
at this elog). Since rebooting AWG means one (or
more) excursion to the LVEA, we had to terminate the science mode for both IFOs several times, unfortunately.
Also h0cosmic crashed several times and had to be rebooted (example).
S5 highlights from the LHO elog are bulleted
below:
The duty cycle is 70% for the last two weeks due to downtime to diagnose and
disable the Mode Cleaner input beam periscope PZT actuators, which were damaged
during a power outage two weeks ago. Inspiral
sensitivity was close to 14 Mpc when the
interferometer was able to lock and was free from the intermittent PZT noise
transients.
Activities during the maintenance period included measuring and setting the
frequency control loops, repairing the connections for two environmental
sensors, and changing frame builder configuration to increase the look back
time for trend data.
Updated the EntraPass display screen on the
operators console in the control room. The "desktop" buttons have
been relabeled and now show the correct screen selection.
Replacing first aid supplies which have exceeded their expiration dates
Found no Site/Laser safety concerns this reporting period.
-
ejected tapes for shipment to CIT, imported and
labeled new
-
failed disk in T3-5,
replaced with disk from T3-16.
-
unmounted
/oldframes filesystem that
was located on some of our T3s. removed corresponding entries from configuration files. Those T3s are ready to be used for spare
parts.
-
added airflow, smoke alarm, and voltage monitors
to the LDAS room
-
Disk2Disk and L0 publishing problems earlier
this week when d2d was turned off overnight.
L0 publishing was then unable to pick until configuration changes were
made.
See Advanced LIGO
We are trying to address the problem of AWG/TP computer crashes, particularly at LHO. After some discussions between Sigg, Ivanov and myself, the initial approach we are taking is to use a single TP manager at LHO and move that code to a Framebuilder (has access to both IFO networks). This is being done for a couple of reasons. First, the method by which DTT finds testpoints by checking with the present two TP managers at LHO may be a root cause of the problem. Reduction to one TP manager would would take away this possiblity. Secondly, by moving TP man to the Framebuilder, AWG/TP manager will be separated and, if the problems continue, will make diagnosing the faulty component easier (is it AWG or TP man that has the problem). Alex has the new code ready and has been tested here. We should be ready to try it at LHO during next Tuesday's maintenance period.
No report.
No report.
We have floated both stages. We have
leveled both stages (both height and angle) using trim masses. We are currently in the process of learning
how to set the locker/stops. There as an interference in the 1-2 stage stops which required some
minor machining.
All the materials for the heat load test have been collected and prepared. We will vent the week after the LSC meeting. Also there are now working temperature gauges mounted on the BSC and beam tube to monitor the external temperature's effect on the quad.
Mendell:
I have been working on the draft of the S4 PowerFlux,
StackSlide, and Hough paper, and will present this
with the pulsar group at the pulsar group F2F meeting this weekend and at the
LSC meeting next week.
Yakushin:
The VDT developers undertook their first attempt at adding TclGlobus to the VDT package this week. Alain Roy reported
problems with building TclGlobus 1.3.0 at their site.
We are working with him to track down the source of the problem, although the
problem has not been seen on our hardware here at CIT. One possibility is that the versions of Globus being used by the VDT
team is different from the standard distribution available directly from
the Globus developers.
Investigated the possibility of adding an option for Tcl channel to use gridmap file
as a way to authorize X.509-based client. I've added several GSI
functionalities to handle this case based on reading XIO-based GridFTP server source code and it's still not working.
Worked with Kent Blackburn on one page flyer on TclGlobus to be handed out at the Open Science Grid
Consortium Meeting during the demonstration of Advance Workflow Tools for LIGO.
Updated grid-mapfile on our
OSG-ITB testbed cluster's head node with new VORS
certificate in order to support polling by VORS cron
job.
Successfully partitioned the S5 HIPE DAX workflow into six
partitions in order to test the functionality of a VDS utility: partitiondax.
Determined that the first partition of the S5 HIPE DAX produced by the partitiondax utility is sufficiently large as to run out of
heap memory while the workflow planner is running on a 2 GB x86
platform. Worked with the VDS engineering team to
better characterize the source of the memory consumption.
Delivered a version of site_verify.pl modified by the VDS engineering team
that tests for the installation of the vds
components, to the OSG Integration Testbed working
group chairs for incorporation in a future ITB release.
Worked with Michael Samidi on bug fixes and
extensions to the LIGO Work Flow Planner based upon feedback from LIGO
scientists and the Griphyn-LIGO face-to-face meeting.
Worked with Kent Blackburn on one page flyer on the
Graphical Workflow Planner Application to be handed out at the Open Science
Grid Consortium Meeting during the demonstration of Advance Workflow Tools for
LIGO.
Attended the weekly OSG Teleconferences of the Virtual
Data Toolkit, OSG Integration Testbed and Virtual
Data System. Attended a teleconference on the
evolution of the Science Grid This Week newsletter into an international
newsletter involving CERN and EGEE.
Worked with Paul Avery on the agenda for the Communications session which he and I will chair at the Open Science Grid Consortium Meeting.
64-bit testing on Solaris continues to run extremely well and this week
focused on fixing and opening a large number of fairly small bugs:
-
PR 3023: add -timeout to client gt_xio_socket
call with a value defined by new resource variable ::TCLGLOBUS_SOCKET_TIMEOUT.
Need to test on tandem-iv when it is ready for ldas.
-
Finished PR 3036 - queue up graph prints to output only
1 banner.
-
PR3023: add -timeout to client gt_xio_socket
call with a value defined by new resource variable ::TCLGLOBUS_SOCKET_TIMEOUT.
-
Closed PR2917 add cntlmon
resource vars to support tclglobus
fixed for 1.8.0.
-
Working on PR 3038 - all user cmd
test fails to run abortJob
when using username/password.
-
Wrote PRs for lsync cache mismatch with diskcache.
-
Closed PR2919 - ::DEBUG_THREADS 0 in LDASdiskcache.rsc.
-
Closed PR2921 - non fatal dt update log messages recorded as red balls.
-
Fixed PR 3046 by adding passing md5sum output directory
to thread call reduceRawFrames_t and included Greg's
test example in regression test pr2953.tcl.
-
Closed PR2918 - need extra environment vars in manager to boot cntlmon
with tclglobus.
-
fixed PR 3043 - manager leaks
manager key reporting an exception.
-
Performed system test for ldas
1.8.263.
-
All test passed as before except for lsync which is still unable to see RDSVerify
and some /scratch directories in the lsync cache.
-
Ran Greg's createRDS loop
test on dev but got intermittent failures due to frame thread callback
sometimes fail to find .tmp file - PR 3040.
(Dan Kozak)
/home bytes not accessed in 6
months: 285GB
/home bytes not accessed in 4
months: 2.73TB
/home bytes not accessed in 3
months: 3.28TB
(Phil Ehrens)
(Erik Espinoza)
-
271-280 - iommu=noagp
-
281-290 - iommu=noaperature
-
291-300 - iommu=off
(Stuart Anderson)
(Igor Yakushin)
(Dwayne Giardina)
(Greg Mendell)
(Ben Johnson)
(Larry for Keith)
(Dwayne)
(
(Christine)
(Mike)
(Veronica)
(Bruce Sears)
iLog
Maintenance: (0.5
days)
General iLog
maintenance (user adds, keyword adds, systems work, etc.)
(Christian)
(Larry)
Mail Statistics for Aug. 03-09, 06
|
Mail Statistics |
8/10/2006 |
|
Rejected Messages |
31,515 |
|
Virus Messages |
1,771 |
|
Accepted Messages |
26,633 |
|
Total Messages |
58,148 |
From: Dennis Coyne coyne@ligo.caltech.edu
See also:
Records
Of Decisions or Agreements (RODA) status web page
Vacuum Preparation & Residual Gas Assay (RGA)
See also the Vacuum Bake Lab
Bob Taylor
High-Irradiance, Contamination-Exposure Cavities
Lee Cardenas, Liyuan Zhang
Cavity # 1: OTF Lab. at W. Bridge: No Change.
[Still measuring absorption & total loss on wire sample daily. Ready for new sample.]
Cavity #2: No change
Cavity #3: OTF Lab at Lauritsen Room 38: No Change
Still measuring absorption & total loss on stepper motor sample daily. We will continue taking measurements until the test is completed.
Scatter/Absorption Test Measurement:
Testing the system after the change to the new 1 W HeNe.
From: Hiroaki Yamamoto hiro@ligo.caltech.edu
AdvLIGO LSC/ASC design using FP arm
model with quad suspension (Osamu, Hiro)
We had a talk at the ALIGO sys meeting, and we got information that initial LIGO has 1e-14rad/Hz shotnoise with 0.5-1mW input, but E2E resulted 1e-14rad/Hz with 25mW input for AdLIGO setting. E2E should show 5 times less noise. Under investigation.
For the investigation of a FP cavity with AdLIGO
parameter, Electronic noise on WFS PD is being implemented. Preliminary result
tells us that it is pretty tight to operate with low power(1kW)
with the electronic noise which is adjusted to full power(0.7MW). We might need
test mass control for both ETM and ITM or high/low gain WFS.
40m Simulation (Monica)
Adjusted the demodulation phases for POX33MHz and POY33MHz for the 40mInLockState package: each end mirror has been dithered to estimate the mixing angle for the two error signals. No offset has to be added anymore in the control system to get the in-lock state. The stability of the control system in under investigation.
Static IFO Simulation (Hiro)
Code implementations are going, no interesting physics.
LLO mode matching (Hiro, Sany)
The mode mismatch was at LLO was investigated. The loss of power due to mode mismatch is proportional to delZ^2, where delZ is the displacement of the waist position of the input beam relative to the correct waist position. With delZ 350m, the loss due to mismatch is 3.5%. Using the loss of 10%, delZ is calculated to be 600m. With the help of Sany, now calculating what the offset of MMT2 should be to correct this offset of the waist position.
Modeler (Hiro, Bruce)
Modeler (e2e simulation engine) is being modified so that the number of input and out ports can be changed using alfi. (alfi front end is done already)
Mechanical Simulation for Advanced LIGO (Sany
and SLU team)
(1) E2e modeling
Continued our e2e study on frequency noise due to Mode Cleaner length fluctuation. Using a PSL beam with a finite line width (about 3 kHz FWHM) as input to our LIGO I MC model and the SimLIGO’s standard floor motion as input to our LIGO I HAM stack model, computed the frequency fluctuation of the MC transmitted beam. The obtained power spectrum indicates that the frequency fluctuation is on the order of 10-4 Hz/rtHz at 0.1 Hz, going down to 10-5 Hz/rtHz toward 0.8 Hz, back to 10-4 Hz/rtHz at 1 Hz, stays leveled till 1 Hz, and steeply going down to 5x10-8 Hz/rtHz at 20 Hz. In 20 Hz ? 100 Hz, the fluctuation appears to stay at the level of 5x10-8 Hz/rtHz. Note that in this computation, the MC length was locally controlled (there was no feedback from the arm). The frequency fluctuation at 100 Hz approximately corresponds to the arm length fluctuation of 10-18 m in common mode. We appreciate precious advice by Hiro.
(2) Outreach
The whole group (Sutton, Anderson,
ALFI : e2e Front end (Bruce, Melody)
Grouping and layering of objects are being implemented.
From: Ken Mason <kmason@ligo.mit.edu>
The Two stages have been leveled to within .0015. We have had trouble with the stage 1-2 locators not fitting properly and had to remove them for machining. A stop on the stage 2 interfers with being able to center them. Next week Fred Miller will be attaching the actuators, making temporary cabling, and attaching a MEPI controller in preparation for modal testing. This will complete the assembly of the ISI system.
A new design has been made for the power screws on the spring installation tooling. The ASI design could only be used once and the screw would seize. We have ordered hardened screws, with and without silver plating and nuts with nitronic inserts.
From: "Joseph A.
Giaime" jgiaime@ligo.phys.lsu.edu
Brian Lantz to give LSC talk on two topics: 1 stage HAM and ETF progress.
Rich to give LSC talk on BSC
prototype work.
Both stages are suspended on their springs in approximately the correct place!
The capacitive displacement sensor for stages 1-2 and 0-1 seem to require working offsets of 0.25 mm and 1 mm, respectively, based on the current installation at MIT. On the bench, the working range appears to be good. This will get resolved as soon as people get home from various trips
Jay, Rolf and Brian met at Stanford to prepare specifications for the new control software.
Dan DeBra, Ken and Dennis brainstormed on how to rework the spring installation fixture to prevent its rapid demise due to galling. Ken will order some Silver-plated threaded rod and also study other options.
Nice new results from the platform, to be presented at LSC meeting.
Some problems with ADE built-in digitizer in the seismometer experiment.
From: Ben Abbott <abbott_b@ligo.caltech.edu>
Rolf, Jay, and I met with Brian Lantz on Monday to discuss the ISI electronics. Some good progress was made.
From: Dennis Coyne coyne@ligo.caltech.edu
no meeting next week (G&M closed & there is the LSC meeting)
Inverted pendulum alignment problem fixed
- Could add a full payload test at G&M (not part of the current plan) -- do we want to do so? Ric & Dennis to discuss & decide
- Should have Dave Ottaway confirm that LASTI has the full payload mass for use in vacuum (optics table of course, plus stainless steel masses (such as the BSC stack masses removed, et. al.), plus triple pendulums, etc.)
FTIR machine has arrived -- to be set up. will rely upon Soldi to obtain ultra-pure grade isopropyl alcohol
Ric posted a few photos of the parts & assemblies on his web pages:
http://www.ligo.caltech.edu/~desalvo/HAMSAS/assembly%20photos/
http://www.ligo.caltech.edu/~desalvo/HAMSAS/cleaning%20photo/
http://www.ligo.caltech.edu/~desalvo/HAMSAS/final%20assembly%20IP/
cleaned part to be shipped to CIT for cleanliness testing
- CIT to loan spectrum analyzer, or G&M to rent, or loan from Virgo? Ric to pursue
installation cart fabrication nearly completed, except the lifting parts
need to build a clean lifting fixture to be used iwithin the clean room (high priority for Chiara)
Ric plans to go to G&M ~9/1 to continue support to the assembly
Dennis has approved the use of the bearing in the installation jigs (after cleaning in isopryl alcohol) with a sheet metal shield around the bearing to protect possible inadvertent transfer -- can't see, feel or smell any oil/grease
status of LVDT driver? blank board was to be delivered on Friday -- plan is still
to build the unit in
G&M to ship coils to Virginio at CIT for calibration & test
shims (PEEK) will need to be made/changed to adapt to modified GAS filter (set point is higher)
From: Ken Mailand kmailand@ligo.caltech.edu
I'm using the latest information from Ian and working on a lower quad installation arm shop drawings, also a 'conveyor' version to be used at the LASTI site. The existing fixture has been disassembled, the table and parts will be plated next week. I'm working on the DLC mounts, the PO Telescope, and cavity beam dumps for Mike Smith.
From: Gregg Harry
<gharry@ligo.mit.edu>
We have finished measuring the 65/35 silica doped titania/silica coating from CSIRO. It gives a mechanical loss of about 1.8e-4, averaged over the coating. This coupled with its Young's modulus which is very similiar to the silica substrate makes this coating almost as good in thermal noise performance as the titania doped tantala. Plus the silica doped titania coating has already demonstrated 0.5 ppm optical absorption. If the index of refraction of the silica doped titania could come up about 10 percent (possibly with a small amount of tantala dopant?), this coating would be better than the baseline titania-doped tantala coating.
From: Bill Kells kells@ligo.caltech.edu
Mostly last day and night push to get the SURF project finished with solid results. Its down to the wire, but appears we are getting very revealing NEW insight into the PI phenomenon. We are surveying (thanks to massive computer power !) all the acoustic mode resonances existing in the ideal AdL TMs (ie perfectly homogeneous, exact right cylinders) to ~80kHz (i.e. just beyond the 2nd arm FSR). Since we are not primarily concerned with reproducing the "single cavity mode" resonance cases already investigated by the Australians and Russians, the miriad tuning differences which will distinguish the actual TM acoustic modes are not significant in our study.
From: Helena Armandula ahelena@ligo.caltech.edu
Assembled a spare ECD, it will be shipped to LASTI on Friday.
An RFI was drafted and sent to CSIRO, REO, MLD, LMA and ATF; the objective is to assess the interest of the vendors in providing Adv. LIGO coatings as well as budget and time required to get ready to handle the large substrates.
From: Michael Smith <smith@ligo.caltech.edu>
Hartmann Probe Beam - Alternative paths for the ITMx and ITMy Hartmann probe beams were created in ZEMAX. The Hartmann ITMx beam in introduced through the AR side of MMT2 and is expanded by an input lens and by MMT3, on-axis with the main IFO input beam; this will require transmission through the HR and AR surfaces of MMT2, and reflection from the HR surface of MMT3 @ 670nm wavelength; both surfaces of the BS must have minimum reflectivity @ 670nm wavelength. The Hartmann ITMy beam is introduced through the AR side of OMMT3 and is expanded by OMMT2 and OMMT1 on-axis with the main IFO output beam; this will require reflection from the HR surfaces of OMMT2 and OMMT1 @ 670nm wavelength. One benefit of the alternative beam paths is the elimination of the off-axis parabolic beam expanding telescope for the Hartmann ITMy beam. One off-axis parabolic beam expanding telescope per IFO is still needed for receiving the ITMx PO beam
I visited the production facility of the Tydex, J.
S. Co. at the Federal Research and Production Centre at Sosnovy
Bor, near
I am in the process of modeling some of the stray light baffles in SW and
importing the STEP models into ZEMAX.
From: David Reitze <reitze@phys.ufl.edu>
Alignment Sensing/Stable Recyling Cavities (Guido Mueller/Muzammil Arain)
Complex modulation - Succeeded in controlling AFG3252 directly from matlab. This allows to directly program the function generator with arbitrary, matlab calculated waveforms. Using the function generator together with two HF amplifiers in a "complex modulation" scheme allowed the creation of a single (one sided) 17MHz sideband on the carrier.
EOM phase/amplitude noise - Characterized the NPRO beam jitter noise using the Quad photo detector. Working on the common mode noise rejection measurement; the idea is to substract the noise from carrier-carrier beat note out of the carrier-sideband beat note to get the information about the modulation index variation.
From: Rolf Bork rolf@ligo.caltech.edu
From: Riccardo
DeSalvo <desalvo@ligo.caltech.edu>
Livia, John
We have continued our efforts to confirm previous mesa beam tilt measurements. The alignment of the cavity has been improved and the finesse has risen by 20%. Mode shape is better but lock is still unstable. Analysis of current results seems to confirm our expectations. We will now begin implementing a PDH locking scheme in preparation for power recycling.
Marie
This past week I pulled out the frequency and attenuation factor from all of the fits we have so far. I then made plots of the Q-factor vs. the frequency for the glassy metal spring at room temperature, 30 degrees C, and 40 degrees C. Comparing the plots and talking with Riccardo, I plan to remove some of the mass already on the spring and retake data to try to find what we are looking for. We are also in the middle of collecting data at 50 degrees C. I also visited LHO on Thursday and Friday which was a great experience.
Michael Koyfman
This week, I have been working on fitting the graphs for the anti-spring
oscillations, specifically maraging steel at 30
degrees Celsius and the glassy metal at 40 degrees Celsius.
For additional information about this report, contact Stan Whitcomb or Phil Lindquist