Many LSC members took part in the Amaldi Conference in Sydney Australia. The LSC had a very large presence at the meeting; I would estimate that there were more than 50 talks and posters by LSC members on LIGO and GEO-related activities.
The annual LSC MOU review will be held on August 16,17 at MIT in Boston. A powerful new form-based web interface has been set up to facilitate reporting; LSC PIs have been sent notices to begin reporting their groups' activities.
A first draft of the GRB070201 paper has been circulated to the LSC and will be discussed at next week's LIGO-Virgo meeting (July 23-26 LSC at MIT).
The LIGO-Allegro stochastic search paper "First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds" has been published online in Phys. Rev D:
The S4 stochastic radiometer search paper "Upper limit map of a background of gravitational waves" and the AstroWatch paper, "Search for gravitational wave radiation associated with the pulsating tail of the SGR 1806-20 hyperflare of December 27, 2004 using LIGO" have been provisionally accepted in Phys. Rev. D.
>From: Rod Luna <rluna@ligo.caltech.edu>
DocDB, developed for FNAL will be implemented as a replacement to the current home-grown DCC database. Thanks to Joe Giaime who oversaw a trade study to evaluate and propose a replacement. The DCC upgrade team will provide a reprot at a future weekly executive committee meeting. Two subcommittees will oversee the implementation and rollout: one chaired by D. Shoemaker will address DCC use policy; one chaired by S. Anderson will address technical implementation for the Laboratory.
>From: Cleveland Mak <mak_c@ligo.caltech.edu>
>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>
Twelve days to a first complete draft of the Continuing Operations Budgets and Proposal (FY 2009 through FY 2013).
Everyone's continued support is appreciated. We are working budgets and text.
>From: Cindy Akutagawa cindy@ligo.caltech.edu
The monthly Staffing Committee meeting was held on Monday, July 16. The minutes and action items from the meeting are in progress and when completed will be posted on the SC web page
>From: Bill Tyler tyler@ligo.caltech.edu
Dorothy Lloyd has been helping (she's doing all of the work) with the final drafts of the two LIGO safety documents (reformatting and wording revision inputs).
The duty cycle of H1 for the last week (from Thu. 12/Jul/2007 to Wed. 18/Jul/2007) was 87.6 percent, with typical 15.5 Mpc range. For H2 it was 85.8 percent with 6.5 to 7 Mpc.
Summaries: Range and Duty Cycle update. Tuesday maintenance summary.
Highlights from the LHO elog:
Duty cycle 74%, inspiral range around 14 Mpc.
Scattering measurements were done during this Tuesday commissioning period.
[J.G.: We spent the entire Tuesday maintenance period laser-safe for the BBC (see below). When operation was restored, we found that the TCS controllers and their processor had re-synced in a bad way and required reboot. After nearly two years of running, we encountered a fresh new failure mode, though our fine crew figured it out pretty quickly.]
--------------------------------------------------------------------
Reported under General Computing, see below
General computing and LDAS admin (Giardina)
---------------------------------------------------------------------
Reported under LDAS System Administration, see below
Data analysis & computing (Yakushin)
---------------------------------------------------------------------
Storage/Condor/LDAS admin:
Data analysis:
Worked with Norna & Calum on a list of final design tasks for the output mode cleaner prior to a design review. With Dennis's help in prioritization, Chris feels he will be able to finish off the tasks assigned to him. We will have weekly (or more) meetings to support this work. I am going to Caltech tomorrow to support OMC and RM work.
The wooden RM structure was delivered from the Caltech carpenter's shop. It is hoped that when I'm at Caltech I will work with Greer and Bob and cut up some styrofoam to resemble the suspended and non-suspended items to check for assembly access. I will work with Bob and Greer on PDMWorks fault issues as well. Spoke to Calum last week about his PDMWorks issues on the updated OMC bench drawing. Reviewing Greer's weld sample drawings.
Prototype LOS earthquake stops parts were sent to Mike Zucker at MIT. He's scheduled to do an assembly test and send one or two to Kineoptics for additional tests.
Conducted Program for LSU Strategic Iniatives effort: hosted 35 undergrads
Planned and conducted teacher professional development program for MSP Project I-TAPS, Tangipahoa parish
Planned and conducted teacher professional development program for MSP Project SYNERGY
Planned and conducted teacher professional development program for Southeastern Louisiana University (LA GEAR UP sponsored)
Collected and organized materials for Slinky Snack
Analyzed data from Student Pathways booklets to help refine usefulness of booklets
Revised Student Pathways Exhibit Exploration booklet
Teachers in the RET program continued their work on various projects
Worked on a new slinky activity for teachers on Waves.
Updated and revised pre- & post- visit surveys for the fall.
Worked on both Close Out and Next Phase committee issues
Continue to make changes and improvements to the LIGO SEC web-site.
One SEC staff member continues training at Exploratorium
[J. G.: A crew from the BBC show, "Horizon," filmed here on Tuesday & Wednesday. Our material would be part of a program on gravity/strings/theory of everything.]
See Advanced LIGO
See Advanced LIGO
Alignment continues to go well, with NAC's visibility at 85% and SAC's at 35-40%. We should be able to close the chamber and pump out soon.
Akira left to do a scimon shift today (Thursday).
Also, the mirrors with optimized coatings arrived from LMA.
BSC-ISI
Quad-Noise Prototype
Quad-Triple Cavity
_______________ Eirini Messaritaki: * I worked with Vibha on the detection of eccentric inspirals with circular inspiral templates in Advanced LIGO. We worked on code that takes in the eccentric waveforms and calculates their match with circular templates. * I worked on validating and documenting the follow-up pipeline that Romain and Chad are implementing. Spent most of the time working with zero-lag triggers; injection and time slide triggers will follow. * I read over the S4 PSH paper and attended the pulsar review calls. * I worked on debugging the null stream code and trying to figure out why it segfaults. ________________ Igor Yakushin: * Presented "All-sky search for gravitational wave bursts during the fifth LSC science run" at Amaldi7 meeting: * Redoing LIGO-VIRGO project 2b using the proper sampling for VIRGO MDC injections (we did not realize that MDC were sampled at 20kHz and not at 16384Hz); * Reruning S5 fully year coherent waveburst analysis on version 3 h(t). ________________ Kent Blackburn: GRID APPLICATIONS DEVELOPMENT - Conversion to tagged version s5_1yr_lowcbc_20070711 for binary inspiral analysis: - install glue, lal, lalapps - change .ini file section condor - Conversion to V3 data - Generate new segment lists - Genate new .dax/.dag files - Test V3 data WF on ldas-grid - Conversion to Pegasus 2.0 - Convert sites.xml - Convert tc.data - Change bottom of tc.data to updataed tag version - Convert Property files - Debugging: pegasus-get-sites: - tc.data not generated correctly, did a manual tc.data fix - pegasus-run tailstatd error, not yet solved - namespace change, not yet solved - schema change, not yet solved - Running V3 data WF on OSG - sucessful run at LIGO_CIT_ITB and STAR_BNL - testing small WF on other sites - Attend LIGO all hands meeting - Write agenda for weekly LIGO-Pegasus telecon - Attend weekly LIGO-Pegasus and DASWG telecon OSG INTEGRATION TESTBED - attend OSG Operation telecon - attend PEGASUS telecon - attend DASWG telecon - attend OSG ITB telecon - understand the LIGO/mkdir problem is caused by race condition between globus job management and condor job management, follow up with VDT and CONDOR team on resolving the problem after PSU site is back to operational - debug Pegasus 2.0 release with ISI - patch the new realease after bugs are fixed - install missing perl modules for Pegasus 2.0 - propose and co-establish a simple validation test case - propose and co-establish two Pegasus LIGO work flow documents, one is to track current Pegasus 2.0 LIGO Work Flow usage procedure, the other one is to track any problems or bugs happen during the job prepare/submit/run process and their corresponding solution and fix. - contribute a generic BASH Shell post processing script used by remote site for Pegasus 2.0 LIGO work flow. OSG MANAGEMENT - Reviewed quarterly reports from OSG funded institutions. - Reviewed User Feedback reports from OSG Users community. _______________ Xavier Siemens: -Worked on micro-lensing paper. Has been submitted to archives and MNRAS!
This week sees the release of ldas-1.9.0. This release has many bug
fixes and feature enhancements. It will used for the remainder of the S5
science run. This version has gone through system testing with all tests
passing. For the complete list of problem reports closed in this release
cycle, go to:this site.
Steps are being taken in preparation of installing the software at CIT
and MIT today and at the sites next Tuesday during the maintenance window.
MIT
---
(Fred Donovan)
* Came up to date on accounts and yum updates; matlabr2007a license active; 2 more disk replacements; work on monitoring avail. disk space on pcraids; started data13 install (was unused datachche11).
Livingston
----------
(Igor Yakushin)
* Erased some files left after the replication from CIT to LLO was fixed since ldas-cit:/usr1 file system got full;
* Installed latex on cluster nodes at LLO (it was already installed on ldas-pcdev1 and ldas-grid).
(Dwayne Giardina)
* Tape eject for shipment to CIT.
* Added network usage to cluster_mon summary page, still need to add graphs.
* Gave Doug a run-through on the tape eject for storage process.
* LSCSOFT update on the cluster.
* Changed default Matlab version to 2007a.
Hanford
-------
(Ben Johnson)
* Got subscription (1 month) to Safari Tech Books Online. The search function alone is worth the subscription fee.
* Trying to set up an easily used DTT on the cluster ldas-pcdev1 boxes. At the moment this involves setting up the UDN creation tasks, and starting DTT with the right environment.
* Reaeching LDAP, at least w.r.t Solaris 10 authentication, to see how an NDS server would leverage it.
* Need to prepare a working NDS example for Rolf's visit next week. Or at least show him the "grand" design.
* Power glitch on the 18th. This caused the cluster to reboot itself causing a stuck node and diskcacheAPI, but the main servers, disks, and tape library were unaffected.
MIT:
(Fred)
-Did quick nessus scan of hosts:
-Upgraded apache on ligo.mit.edu;
disks added (2TB) nova - stress tested: some purchases; dtt issues on
alpha (inconsistent saving of data files) pinned down;
-Started additional backups of LASTI local data disks; some ilog; some
installs and license issues (mathematica; matlab;)
Livingston:
(Dwayne)
-added more rules to spam filter
-new PC attached to power monitor. relocated to CUR. rearranged CUR
somewhat
-attempted to troubleshoot network issues on a couple of machines. it
looks as though the situation resolved itself.
-restarted the comsol license server running on abundance a couple of times
-rebuilt a desktop PC for a user
-working on reinstalling OS X on a MacBook Pro. running into some
roadblocks so far.
-usual user support requests
-cleared spam trap
LLO mail summary for 12 July 2007 - 19 July 2007:
Rejected: 7,724(72 containing virus)
Accepted: 5,570
Total: 13,294
(Shannon)
-Investigating a couple of suspicious IDS alerts. Working with Larry
on this.
-Continued setting up and tweaking the weekly port scans/reports. At
Larry's request, scanning CIT more often than LHO.
-Fixed a couple of configuration issues on alderamin.
-Set up samba on a machine for shared files.
-Helped Dwayne troubleshoot a problem on Basin and desoto. (arp table
problems)
-as usual, more documentation items.
-Moved Bermuda to the KVM.
-Travel planning, pcard reconciliation, etc.
-Tested connection back to CIT for the all hands with Mike yesterday.
Hanford:
(Christine)
- Finished moving the large disk users to the new RAID disk and setting
their disk quotas. Now I start moving the small disk users. There were
only 24 large users and approximately 225 small users, but they won't
take as long per user to copy the files across.
- Helped a user with remote mail access.
- Helped test the All-Hands meeting web camera setup several times.
- Helped with some problems running DTT on GC computers and problems
transferring files from CDS to GC.
CIT:
(Mike)
-Installed the latest service packs on our Primavera Server. This is a
very time consuming process.
-Spent most of this week testing many video cameras, and different
network configurations to come with a solution to transmit a live
broadcast of today’s “all hands meeting.” After testing with the
observatories it looks like we have a setup that will work. This can
also be used for future meetings. This was a GC team effort.
-Worked on some SolidWorks issues regarding PDMWorks.
-Recovered deleted SolidWorks drawing for a new user. Just reminder
backups are very important. Users should be backing up all work to their
provided home account or some other sort of backup, USB drive, Burn to
CD, or memory stick. You never know when a hard-disk failure or an
accidental delete may occur.
-Other misc. user/phone support, plus additional sysadmin tasks.
(Christian)
-Testing video webcam for the all hands meeting this week.
-3flr W/B-Hard drive failure on visitorsÂ? workstation. Replaced
old system with new and transferred all the data.
-Riccardo Desalvo- Installed and configured system with
Data Acquisition card.
-Other misc.: Continued onsite software/phone support.
(Veronica)
- LIGO: Working on a navigation change for the homepage, other website
upates. General computing support: Addressed an issue with one of the
DCC applications not working; a couple of issues of Windows servers
maintenance; addressed an issue of lack of access to IP-restricted
pagesat MIT. Support of the all-hands meeting. Attended a talk on
content management using wikis.
- LSC: Ongoing support of the upcoming meeting: updates of the
website, the database of participants. Updates of the database of
technical papers.
(Larry)
-Worked on a number of procurement related activities.
Assisted Gina on a couple of items that needed to be resolved.
Finished up p-card reconciliation. Working on additional documentation
for past purchases.
Tracking some existing purchases that should have arrived.
Working on purchases for new edge switches and another UPS.
-Setup a number of new accounts. This has become time consuming in that
most of these were not planned and walk-ins do take more time.
-Worked with the group on a number of webcam setups. Discovered that
what may work in one area may not in another. We are now working on a
cheap solution people can use for small meetings and another for larger
meetings.
The data streaming to another server gave us about a 5-8 second delay
which proved to be somewhat irritating when trying to work directly. We
have a solution with about a 1 second delay. Still trying to improve the
quality which may come in another solution we are going to try next month.
-Worked a couple of server issues.
-Worked on moving some of the backup data around.
-Still working with PMA and the room renovations. The condensation
problem has been partially resolved.
-Assisted on different logistical issues for the all hands meeting and
the LST meeting at MIT.
From: Hiroaki Yamamoto hiro@ligo.caltech.edu
Static IFO simulation (Hiro)
-------------------------------------
Muzammil of UF sent me the mode coupling analysis he did using modal model for the stable recycling cavity. I am calculating and comparing the mode matching using FFT. The stored power comes out to be 20% lower, and am tracing the cause.
Modeler : e2e simulation engine and ALFI : e2e front end (Hiro, Melody)
-----------------------------------------------------------------------------------------------------------
Code validation and documentation of UDP.
Mechanical Simulation for advanced LIGO (Sany and SLU team)
-----------------------------------------------------------------------------------------
We continued analyzing the results of our AdvLIGO single-stage HAM e2e modeling. This model is based on the state space matrix created by B. Lantz (called PlantSS_isolated), and has typical ground motion fed to ground X input port as the only seismic input. The computed stage 1 X motion is 2e-6 m/rtHz at 0.1 Hz, going down steeply to 5e-11 m/rtHz at 1 Hz and stays almost flat from there towards 2e-11 m/rtHz at 10 Hz. With a great help by Ken Mason, we are comparing this result with previous computation/experiment made by the Suspension and Seismic working group.
From: Ken Mason kmason@ligo.mit.edu
BSC Seimic Isolation Assembly and Test
Hugh Radkins, Corey Grey, Joe Hanson, Myron, and Stephany have assembled stages
0 and 2. Both stages have been lifted onto the test stand with stage 2 held in
place with alignment pins until the springs are installed.
Stage 1 has been assembled on the granite table and will be lifted onto the test
stand on Monday.
The maraging steel springs and locator parts are being cleaned at Caltech. They
will come out of the bake oven on Monday and shipped overnight to LASTI.
The large actuators have been cleaned at LHO and will be shipped to LASTI next
week.
Joe has delivered all the STS-2, GS-13, and L4-C pods which were assembled,
cleaned, and tested at LLO.
HAM Single Stage seismic Isolation Design and Procurement
HPD will have all fabrication drawings, assembly drawings, and assembly
procedures completed by 7/31. We will then close out the design contract.
The material has arrived and rough machining started on the large plates. They
are expected to be completed by 9/1.
The maraging steel is being shipped to the fabricator this week. It will take 6
weeks to machine and 2 weeks to age harden.
Several dozen smaller parts have been machined at HPD's machine shop.
A problem occurred with the purchase order for the HAM bellows for Enhanced
LIGO. Delivery is now scheduled for 10/20 - 10/31. We are looking at ways to
re-arrange our assembly sequence to minimize the delay.
From: Helena Armandula ahelena@ligo.caltech.edu
Adv. LIGO SUS
Received estimates for the ESD mask for the compensation plate.
Silicate bonding (LASTI Lab.)
Buying and shipping the required supplies for the silicate bonding lab.
A portable clean room is being installed for assembly of the clean Enhanced LIGO Mode Cleaner.
Installation to be finished today, electrical power to the room to be connected tomorrow.
Advanced LIGO Coatings
All the LMA's coating samples as well as the CSIRO's samples have been measured at Stanford.
Ashot helped us with a fast turn around so we could distribute the samples marked for different tests during the LSC meeting.
From: Norna Robertson <nroberts@ligo.caltech.edu>
Continuing to work on beamsplitter triple pendulum conceptual design. Investigated different lengths of stages with shortened final stage (overall length held constant) to push violin mode frequencies of final stage upwards to ~ 300 Hz (from ~ 240 Hz) at Peter F's request. This looks feasible. Also updated MATLAB model with revised (larger) size of beamsplitter allowing for wedge. Sent revised parameter set to Mark B to produce thermal noise curves.
OMC suspension work temporarily on hold this week while new legs were fitted under the optics table and clean tent assembled around the table in preparation for optical work being carried out there. Space now very tight in the lab (we are storing a lot of items while various labs are being redone here at Caltech). New metal bench with revised method of suspension (4 separate wires rather then two loops) has been received and will shortly be tested. Alejandro (SURF student) has been making measurements of bending stiffness of various combinations of PFA coated wires and braiding to allow revised estimates of predicted level of acoustic coupling via cables.
Provided MATLAB model of arm cavity baffle single pendulum suspension with code for plotting transfer functions and instructions on their use to AOS.
Working on two talks for next week's LSC/Virgo meeting and Charging Workshop ("Update on Suspensions for Enhanced and Advanced LIGO" and "Kelvin Probe Measurements of the Patch Effect")
From: Janeen Romie <janeen@ligo-la.caltech.edu>
Advanced/Enhanced LIGO
Worked with Norna & Calum on a list of final design tasks for the output mode cleaner prior to a design review. With Dennis's help in prioritization, Chris feels he will be able to finish off the tasks assigned to him. We will have weekly (or more) meetings to support this work. I am going to Caltech tomorrow to support OMC and RM work.
The wooden RM structure was delivered from the Caltech carpenter's shop. It is hoped that when I'm at Caltech I will work with Greer and Bob and cut up some styrofoam to resemble the suspended and non-suspended items to check for assembly access. I will work with Bob and Greer on PDMWorks fault issues as well. Spoke to Calum last week about his PDMWorks issues on the updated OMC bench drawing. Reviewing Greer's weld sample drawings.
Prototype LOS earthquake stops parts were sent to Mike Zucker at MIT. He's scheduled to do an assembly test and send one or two to Kineoptics for additional tests.
From: k mailand kmailand@ligo.caltech.edu
I finished a sketch of a cavity baffle frame for Luke, and a manifold baffle for Mike Smith.
The faraday 4 wire dampened suspension test setup parts are in the shop.
A set of spherical and ball bearing parts in a clean and bake cycle, to see how they will perform dry
From: GariLynn Billingsley <Billingsley_G@ligo.caltech.edu>
The CSIRO Pathfinder Metrology review occurred July 12 and 13 in
Dark field images are available now in the DCC under C070111-00. CSIRO is doing an outstanding job in developing metrology to support the pathfinder polishing. Final polish of the pathfinder substrate will commence within the month.
At CIT we can now be fairly certain that the roughness of the LIGO1 ETM03 is less than or equal to .15 nm rms over the spatial frequency range ~.5 to 21/mm This is less than reported by CSIRO in initial LIGO. Scattering implications are yet to be understood. A full aperture measurement of ETM03 is underway, so that we can soon produce a (nearly) full spectrum psd.
We now have a full size aluminum dummy of the Test Mass without flats, in the metrology lab. This is built to hold reference flats in the proper test position. A V-Block mount is being developed for Pathfinder and as a test setup for what we might use during Advanced LIGO metrology. I hope to reduce the effects of vibration in the measurement by going to a more "solid" mount.
From: Liyuan Zhang <zhang_l@ligo.caltech.edu>
After struggling for the sensitivity for two weeks, we finally finished the HR coating absorption measurement of LASTI LEM-1. Two linear scans of 40 mm were done along X (wedge at Y) with a scan step of 0.1 mm and at outside of the center part of 100 mm in diameter, because our environment is not so clean that we can assure there will be no dust burned on the surface by the high power YAG beam, the event which may downgrade the HR coating. While most of the points are around 0.2 ppm, the mean is 0.29 ppm due to several high absorption points spreading from several ppm to 22 ppm. Since the FWHM of the distribution peak, dominated by the noise, is about 0.2 ppm, our result is thus 0.3+-0.1 ppm. This result is consistent with the number given by LMA measured at the center part. The transmission and AR coating reflection measurements are ongoing.
From: David tanner@phys.ufl.edu
Muzammil Arain:
We have evaluated beam jitter noise contribution from different
reflective components in the IO section. The motion sensitivity does not
warrant triple suspensions. SOSs are adequate for steering mirrors
and MMT2 and MMT3 mirrors.
The results are loaded in the IOO section of Advanced LIGO wiki under
the name of "Beam Jitter Noise from IO". For the marginally stable
cavity design, the contribution from various optical elements is
order of magnitude lower than the PSL contribution.
Luke Williams:
-designing eligo/aligo thermally conductive TGG holder
-designing vacuum chamber for testing RTP wedges, as well as other
cavity experiments
Rodica Martin
-Errant beam baffles material testing for ALIGO.
-Received and inspected the MC3 Noise Prototype mirror blanks from
Corning. We received updated quotes from Coastline Optics for polishing.
-Tested TGG crystals from IAP, ordered new TGG crystals from Northrop
Grumman for ELIGO.
From: Michael Smith smith@ligo.caltech.edu
SLC
Arm Cavity Baffle
The installation of the Arm Cavity Baffle at LASTI has been tentatively scheduled during January 2008, after the quad ribbon suspensions have been tested.
Manifold Baffle
Mike calculated the wide-angle scattered light from the ITM and ETM that hits the walls of the vacuum manifold and scatters into the IFO mode, assuming 15 ppm diffuse scattering of the arm cavity beam due to point defects on the COC mirrors. The scattered light that hits the cylindrical surface of the manifold is a significant displacement noise source, but does not exceed the AOS requirements. However, the cyindrical "corner" where the manifold connects to the viewport spool-piece acts as a retro-reflector and couples a significant amount of reflected light back into the IFO mode--the scattered light noise from this source may exceed the SRD displacement noise requirement at 10 Hz.
Ken made a SW model of a conical, manifold baffle that hides the "corner" and traps the incident, wide-angle scattered light from the COC. The baffle will mount to the inside manifold wall by means of compression bolts. This new baffle is part of the SLC conceptual design.
Phil questioned how the baffle design would enable it to be brought in through the BSC chamber door and subsequently installed inside the manifold.
Errant Beam Baffles
Muzammil and Rodica made in-vacuum measurements of copper plate as a potential errant beam dump material. An unpolished (mill grade) copper plate failed catastrophically with 40W incident power @ 1mm beam diameter. A sample of polished Cu plate survived a 30W beam with no adverse effects.
SiC plate is being considered for future measurements. Muzammil will look into capabilities for fabricating baffles made of SiC.
The IO group is proposing placing photodetectors inside the vacuum chambers to signal when an errant beam event has occurred. Mohanna will investigate the CDS conceptual design needed to accomplish this, including a monitor and trigger in the control room.
BRDF measuring apparatus
Mike designed a focussing telescope to vary the spot radius at the sample, in the range 0.25 mm to 1.0 mm. This will enable us to measure the BRDF of small surfaces, such as the ISC photodiode.
Dan Riley's SW model shows that, with a smaller spot, the imaging detection system will completely eliminate the out-of-focus scattered light from the specular-reflection beam dump. Dan created a Matlab program to verify Mike's telescope design.
The lenses and mounts for the telescope are on order.
From: Virginio Sannibale <sannibale_v@ligo.caltech.edu>
AOS: Arm Cavity Baffle Suspension
Transmissibility studies for the scattering noise injection due to
environmental noise. Results posted in the web page
http://www.ligo.caltech.edu/~vsanni/AOS/ACBSuspension/ACBTrasmissibilities.html
These transfer function together with some model of the Bidirectional
Reflectance Distribution Function can be used to coarsely estimate the
scattering noise reinjected into the IFOs.
Some preliminary studies from Mike Smith shows that attenuation is needed
starting below 1Hz also for the vertical DOF, and therefore a vertical
attenuation stage is required. The simple bounce mode of the wires is not
enough. The simulation can be easily improved by adding a simple model of the
flat triangular blades and if necessary some violin modes.
TCS: LASTI Quadruple Suspension Ring Heater
Not very much just working on wiring issues and vacuum compatibility issues
for the ring heater test at LASTI
From: Peter King <pking@ligo.caltech.edu>
The Beckhoff Automation touch panel has been returned for an software
upgrade. It appears that a number of units were shipped from the factory
without one of the TwinCAT packages needed to make it run correctly and
ours was one of them. I will hear from the MN-based subsidiary whether it
needs to be returned to
A set of paperwork for filling out the "Request for Duty-free Entry of
Scientific Instruments or Apparatus" was completed. At the bottom of form
OMB No. 0625-0037 it states "Public reporting burden for this collection of
information is estimated to average 2 hours per response ...". That is an
underestimate if anything. One problem encountered was trying to find
where one could access the Harmonized Tariff Schedule of the
since the paperwork requires proper classification of the item in
question. The request is approximately 150 pages in length.
Maik Frede and I have been going over answers to the FDA required product
report. I believe we have all the details and it is just a matter of
putting everything together. One problem for all this government related
paperwork is that there are no real guidelines for how to answer the
questions and how much technical detail to provide in the answers.
From: Riccardo DeSalvo desalvo@ligo.caltech.edu
mesa beams
John, Zeb, Sachin still waiting for the rehab of the lab, simulating
the feedback signal from the quad sensors for the angular controls.
Preparing the shopping list for the power recycled mesa beam experiment.
Arianna, Maria, Andrea Riccardo after moving out of the Synchrotron,
restarting the new lab (
Scatterometer feasibility study
Andrea, starting testing some photodiodes and configuration options.
Flexure hysteresis
Arianna, Maria, restarted LVDT measurement and getting ready for
hysteresis measurements
For additional information about this report, contact Albert Lazzarini or Phil Lindquist