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The LIGO Executive Committee Agenda for Monday May 14, 2001 will be:
(Meeting time: 10:30 am Pacific Time)
Open meeting 10:30 - 11:30
Special Items: How are the MDC and E4 going?
The commissioning of the LHO 4 km interferometer began this period.
the very first search for |binary inspiral waveforms in LIGO data using LDAS
no report
no report received
General Items:
--------------
(F. Raab)
Installation/Rework is the main activity, but some 2-km IFO commissioning
is ongoing.
Congratulations to Bill Butler for passing his
oral candidacy exam at U.Rochester. We have begun weekly seminars to get
people's heads tuned to astrophysics analyses.
4k installation and 2k retrofits and earthquake recovery
--------------------------------------------------------
(D. Cook & Co.)
The 4k installation still needs the ETMy optic, baffle and telescope
installed. This is being staged this week. The actual installation
may
start next week.
In general the 2k re-alignment is going well
again. All the 2k optics are
installed, have their new OSEMs and safety
stops in place. All OSEM values
will be measured at the satellite boxes and
recorded upon final alignment.
A few beam dumps need to be replacer, exit
chamber tasks and optic cleaning
to follow. We hoped to finish up all of the
core optics and be well into
the Mode Cleaner by Friday. We should be replacing
doors and closing up by
the end of next week and starting to pump
down.
Some 2k alignment details: Installation tooling remains in BSC8
and will be removed today
and wrapped up for transporting to theY- end station.
ITMx-2k: Re-aligned successfully from the WA-1A spool using the
IAS total
station. Alignment was ~150 urads in both pitch and yaw from the last
alignment which was set from WBE-3A1 spool. The OSEM 50% open light
settings were tweaked slightly during this alignment. PAMs were adjusted
for final alignment <5 uradians both pitch and yaw. OSEM values taken
at the satellite boxes at the time of the
final alignment will be posted in the e-log. The COS laser autocollimator
replaced the total station and was aligned to the ITMx-2k. The beam was
steered through the APS telescope and optics, through the Faraday isolator
and out the APS viewport, by adjusting
the PAMs and OSEMs on the FMx-2k.
ITMy-2k: The optic was reprocessed and re hung to the proper balance
angle
and was re-install Tuesday AM. Modifications to IAS tripod were needed
to duplicate the second setup in the Y arm WA-1B spool. The optic
was installed and aligned to <5uradians using the IAS equipment and
the OSEMs 50% open light settings maintained
to during the alignment. The second COS laser autocollimator replaced
the total station
and was aligned to the ITMy-2k. The COS beam was then aligned to a
target on MMT3 by steering
the FMy.
BS-2k: The BS-2k was aligned to steer the Y-Arm COS alignment beam
through the Faraday isolator and out through the APS port on HAM 10.
We then used both COS laser ACs to send beams simultaneously through
the
APS port from each arm and checked the coincidence. The X-arm reticle
pattern was
~50 uRadians off center in yaw. The FMx was tweaked to correct the
alignment.
RM-2k: The elliptical baffle was reinstalled along with a set of new
safety
stops. The optic was aligned to the Y-arm COS beam.
X-arm PO telescope: The X-arm PO mirror was adjusted to steer the X-arm
COS
alignment laser through the X-PO telescope, its optics and out the
viewport on HAM 9.
Y-arm PO telescope: The Y-arm PO mirror was adjusted to steer the Y-arm
COS alignment laser
through the X-PO telescope, its optics and out the viewport on HAM
10.
BS PO telescope: The BS PO mirror was adjusted to steer the COS alignment
laser through
the X-PO telescope, its optics and out the viewport on HAM 10.
Seismic Systems
---------------------
(H.Radkins, G.Moreno, M.Guenther, C.Gray)
Fine Actuators
All ETM optical tables are being held in place by the PZT actuators
except
at the Ymid; we will wait until there is a beam down the arm to insure
the
alignment is not disturbed by installation and to provide before and
after
noise measurements. The mid stations had been on the PZTs but
were taken
off to allow transfer to CDS power.
Coarse Actuation System
The portable CAS assembly is being completed and we will test on the
Yend
SEI prior to ETM installation.
LSC
-----
(H.Radkins, F.Raab, R.Savage, D.Barker)
Common Mode Tides
The common mode tidal sequencer is currently running on both LHO PSLs.
The
prediction parameter values were fine tuned by fjr using the E2 carm
and
darm control signals. The reference cavity parameters have been
estimated
and the current version of the sequencer only shifts in time and transforms
the strain to strian/temp for input to the reference cavity temperature
control. The next version will apply the reference cavity inverse
filter
to the data; this should track the tide better. Without the modecleaner
or
a full arm, there isn't a good measure of the results yet. We
hope to
start fine tuning that soon. Thanks to
Dave Barker for lots of help with
state sequencers and C code.
ISC
-----
(H.Radkins, G.Moreno)
Lots of initial alignment activity in the x-mid and corner station for
realignment of the 2k core optics.
ASC
------
(H.Radkins, D.Cook, G.Moreno, C.Gray)
Optical Levers
Finally the 4k MMT3 Optical Lever is online and laser safe too!
The other
levers are all functioning but don't have light pipes yet for safety.
These should fall shortly.
FACILITY
-----------
(F.Raab, H.Radkins, A.Rohay, S.Marka)
Eucon Mining operation
Rohay (PNNL) and Radkins collected a days worth of seismometer data
with
base station and roving units to measure the mining operation effects
at
LHO. Rohay is still working up the data but preliminary analysis
suggests
the current location and the equipment used will not be a problem for
LHO.
Thanks to Szabi for providing data from the STS-2.
2k-Input Optics work
--------------------------
(Corey Gray, Betsy Weaver)
Assisting w/ the COS alignment has been the main focus this week.
Currently on the PSL table, we have 3 optical components which will
need to be swapped out at some point: a polarizer and the two PZT
periscope mirrors. The polarizer was sent out to Karl Lambrecht to
be tested (it was thought to be defective); it has been returned and has
been given an "optical clean bill of health" [it was noticed that the casing
for the polarizer might have been damaged, but it didn't affect the polarizer].
We will swap out these components when time allows, all the while maintaining
alignment of the input beam to HAM7.
Other IO activities have been "back ground activities" (ie. installing
optical lever steering mirrors). We are awaiting hand off from the
COS group to finish the IO alignment & installation.
ISC Table work
--------------------------
(Corey Gray, Betsy Weaver)
Installation and Alignment of optics on ISCT4 started this week.
This week was spent primarily preparing for the E4 run. Operator training
for running in a recombined state began Monday evening and has continued
each evening this week. We are unable to lock the interferometer during
the day because of construction noise. All
required PEM channels have been checked out and are operational.
Staging of clean rooms and preparation of clean tools is now largely
complete in anticipation of venting the interferometer following E4.
We experienced a hacker attack last week and are
now revisiting the issue of site security. Damage is largely repaired.
All user passwords have been changed at LLO. Infrequent users will need
to contact Tom Evans to obtain a new password.
| Installation&
Commissioning:
Livingston |
Other Science/EngineeringActivities:
Issues/Concerns |
See also the Installation web page
The 4watt COS autocollimator was set up in the spool piece near the x-arm and was aligned by autocollimating from ITMx. A Sony video camera viewed the reticle pattern projected through the APS port window at HAM10. The FMx mirror was adjusted to center the reticle pattern through the APS optical train, which is limited by the aperture of the Faraday isolator. A second Sony video camera viewed the reticle pattern projected through the ITMx PO port output window at HAM9. The ITMx PO mirror was adjusted so that the projected reticle pattern was centered on the ITMx PO optical train aperture. Two sets of mounting structures and laser adapters are being fabricated, and two zoom lenses are being ordered for two new COS autocollimators. Two tall tripods will be ordered for viewing the output beams with the COS autocollimator at LLO during the vertex re-alignment.
ITMY came out of the bake oven and was resuspended and reinstalled in BSC8. It was realigned using the laser autocollimator from the spool location near the Y arm cryopump. The COS autocollimator was moved ito the Y arm spool and used to align the FMY to point the beam at MMT3. This was followed by alignment of the BS and then the RM.
We have had two 2km suspension controller failures, ITMY and BS. We continue to limp along by moving optics to different controllers, and the failed units are being repaired.
This configuration was used to get a first look at the PSL fequency noise by analysing the feedback signal to lock it to the modecleaner. Qualitatively it looks similar to the noise from the 2 km laser; given the high acoustic noise due to cleanroom, pumps, etc, this may be a good sign.
Testing of the 4 km servo amp started, and a couple of quick mods were identified. The board is expected back tomorrow for continued testing.
Cameras and illuminators installed and working.
The interferometer will be operated as a recombined Fabry-Perot Michelson without recycling during the E4 run. The system remains in lock for about an hour before dropping out due to tidal strain and is reacquired in minutes.
Attempts to run the full recycled system may be resumed after the E4 run and before opening the system. There is some evidence that the compromise in dynamic range due to the non functioning coils on both end test masses and the relatively large seismic noise in the critical 1 to 3 Hz band at Livingston is the cause of the difficulties in locking the entire system. One of the things that will be fixed when the system is opened are these coils.
Before opening, another attempt will be made to measure the losses in the cavities and to independently establish the length of the two arms using the cavity resonances.
MC2, the curved "distant" mirror in the mode cleaner, is suspected of being badly suspended at Livingston. Pendulum Q measurements of this mirror show non-linear amplitude dependent losses. The mirror is possibly the source of seismically driven excess frequency noise at low frequencies. Diagnostic procedures are currently being tested to establish the state of the suspension when changes are made to it on opening the instrument.
The computer situation has stabilized at Livingston but it is still prudent to work on global security measures and a standardized reliable backup technique.
The relative intensity noise from a standard NPRO laser was compared to that of an "enhanced" NPRO laser. As I recall the relative intensity noise of the "enhanced" NPRO was quieter by about 10dB above 1kHz.
More testing of the intensity stabilization servo took place. Some offset problems were encountered with the servo. Some circuit modifications, mimicking the modecleaner 4kHz pole, were in the process of being carried out.
Lee Cardenas
Sander Liu
PSL - In the process of repairing and testing 80 MHz VCOs. Current
status on the units are:
1. Serial Number BL2002 is now completely bench tested. It is packaged in VCO hardwares and ready for system test and delivery.
2. S/N BL2003 and BL2004 boards are both partially tested. They are waiting for parts (5V reference diode, AT1 and AT2 attenuators, and power resistors) before we can continue.
A new 500GB disk system came in which will be shipped to MIT to replace the equipment which was lent by ldas.
The RDS writer setup on decatur had to be reinstalled after the hacker
incidence. At the same time the epics control for the rds writer had been
added to msrepics and a medm screen was put on the site overview.
I have also been working with Szabi to recover from the reinstallation
of the Delaronde operating system necessitated by the recent hacker attack.
This week we have been working on arm-cavity lock acquisition. A finesse
of
100,000 makes lock acquisition in these cavities challenging.
Because the
resonance is so narrow, a high-bandwidth servo is needed to catch the
system in the short amount of time it spends on resonance during a
"flash."
When we bypassed the mode cleaner, we achieved this bandwidth
by acting on
the laser's PZT at high frequencies. Now that we have the mode
cleaner in
place, using the PZT is not so straightforward. Even if the mode
cleaner
did not already send a control signal into the PZT, any changes in
frequency the PZT induced in response to the arm cavity would show
up in
the mode cleaner's error signal, potentially knocking it out of lock.
We have done some preliminary tests of basic servos acting on only a
single
arm-cavity mirror, with appropriate compensation, and acting on an
arm-cavity mirror and the PZT, using a summing junction to combine
the
signals from the arm cavity and those of the mode cleaner. We
have not yet
succeeded in acquiring lock, but as of this writing it is too early
to rule
out any of these schemes. Although we have several models for
the system,
both analytic and simulink-based, there is a lot of parameter space
to
explore here. We are also looking into using broad-band Pockels
cells
after the mode cleaner (which are already in place) to provide actuation
independent of the mode cleaner at high frequencies.
LASTI (MacInnis, LaLiberte, Miller, Mason, Rollins, Harry,
Mittleman, Ottaway, Shoemaker, Zucker)
-------------------------------------------
Cleanrooms: The custom BSC cleanroom/work platform and
"cartridge installation" craneable cleanroom arrived from the vendor
and were installed by our rigging subcontractor.
Fit is excellent and the dome flange-level work platform feels
solid. Curtains have been installed and the blowers and lights
are being wired
up for testing. Bob L. and Fred. M. are modifying the
safety rails slightly to facilitate temporary opening of gates for
passage
of crane loads.
Electronics: We received more cross-connect components, power supplies
and
two more powered Eurocard crates from Caltech.
PSL: Dave Ottaway joined us this week and
will begin organizing
the assembly and test of the PSL. The reference cavity vacuum chamber
sent by Lee Cardenas arrived seriously abused by UPS; we are evaluating
if they did any irreversable damage (our UPS driver actually tried
to sneak away
after leaving the severely beaten box in our back stairwell!).
Lab space: the "Stiff" LIGO II active seismic isolator prototype was
crated and
will be loaded on a truck bound for Stanford today.
Simulation and Modeling (Bhawal)
Pre Stabilised Laser
--------------------
(Biplab) Rick and I are studying the effects of transverse motion of
RF
photodetectors on frequency sensor.
Dual Recycling summation cavity
-------------------------------
Malik has simplified his formulas for dual recycling summation cavity.
His Matlab code runs faster using these.
Code development
----------------
(Andrea) I am just starting to set up the interface for writing frame
formatted output data. It should not take long however.
Code maintenance
----------------
(Ed Maros) Fixed configure.in to support pthreads under SunOS.
Alfi
----
(Bruce) Created multiple choice dialog.
Continuing work on implementation of connection junctions.
(Ed Maros) Implemented most of fix to prevent fully qualified path
names
from appearing in box files.
Andrea:
* Starting to set up the interface for writing frame formatted data.
LIGO Data Analysis System
Software Systems (Blackburn)
The main thrust of effort has been in preparation
of the LDAS release
to support the next MDC. Members of the LSC will
be arriving on Monday
of next week and there will be a joint LDAS/MDC
meeting at 8:30AM to
organize the releases of LAL and LDAS.
We decided to remain with the
previous release of LDAS installed at the sites for this E4 engineering
run due to the late date anticipated for the release of LDAS. The previous
version is one release later than the version of LDAS used in the last
engineering run.
At present we are still struggling with a handful of problems with the
dataPipeline command which will be used to control the LDAS system
and
data flow all the way from the frames through the parallel search codes
and on to the database. This has yet to be tested successfully. There
a
are a couple of problems with reading in data from frames which only
showed up mid week. We are also making changed to handle a problem
with
data identification in the wrapperAPI when data is sent to it from
the
dataConditionAPI.
There has been a significant amount of testing this week. All the base-
line tests show the system to be working fine. But the more integrated
tests have been showing issues related to rapid changes to functionality
to handle more general data structures.
A new framebuilder code has been developed to support multi-second and
multi-frame frame files. This code is being tested now but will not
be
used in the engineering run.
The installation documentation for LDAS was corrected and upgraded in
preparation for the new release. Several LSC sites reported problems
in
the build of the last release. All inconsistencies in the documentation
have been fixed for this release.
Peter Shawhan developed a client program called SeqInsert to serialize
the insertion of LIGO metadata from the DMT into the LDAS database.
This will prevent job failures due to metadata being inserted "out
of
order" by the multithreaded metadataAPI. It may also serve as
a model
for other "smart" LDAS job sequencing clients.
At the end of the day (after the report was submitted), Kent reported:
"At approximately 1:30PM today Phil was successful
at running
|the first LDAS dataPipeline command using LIGO
frames for
|input data from the Hanford Observatory's E2
run. The data
|consisted of a locked section of the LSC-AS_Q
channel and
|one other ancillary channel. The data was resampled
and a
|power spectrum generated in the dataConditionAPI.
The IFO
|response function was read in and appended to
the data sent
|to the wrapperAPI. The wrapperAPI ran the latest
inspiral
|search code to look for waveforms from 1.4/1.4
and 1.4/1.8
|solar mass pairs. No events were detected so
no entry was
|made in the database. This marks the very
first search for
|binary inspiral waveforms in LIGO data using
LDAS. My
|congratulations to all of you for working to
make this little
|step in LDAS happen!
|
|Undoubtedly there are still a lot of things
to be worked out
|and tested with the dataPipeline, but to me
this is tremendous
|news."
[GHS note: Congratulations for the first "search"
with LDAS !!]
Andrea Vicere' :
He has dealt with the issue of providing data in frame format starting
from ILWD data. The library is based on the Virgo FrameL library and provides
a way to simulate a simple framebuilder. Some data have been converted
to help the test and debugging of the LDAS pipeline. Some more work shall
be needed however to fully support ILWD data conversion.
Hardware Systems (Anderson)
Stuart is traveling the latter half of this week for work at Green bank,
WVa (radio pulsar side of his life).
All T3 RAID systems at LLO have been successfully installed and have
been brought on line.
Data Analysis Activities
Andrea Vicere' :
Started to work with Sanjeev Dhurandhar on the issue of the coherent
analysis for coalescing binaries: the main point is to understand the practical
problems raised by the coherent analysis, and to look at what can be done
to reduce the amount of data to be exchanged and the computations to be
done, using selection criteria on the single channels.
Held a 1 hour teleconference with the Virgo group
working on coalescing binaries: I am still participating in the development
of the analysis library, which can be useful to keep up to date my understanding
of the Virgo analysis pipeline and be able to know what shall be available
for the network analysis.
General Computing (Wallace)
MIT:
(Keith)
-Purchased single/dual/quad machines for ldas
-Investigated 2for1 research grant deal from Sun (not great)
-Distributed non-demo version of SSHWinSecureShell24.exe to pc users
-Updated accounts for visitors
-Currently installing firewall for printer (prone to attacks)
Livingston:
-Preparing for the E4 run.
-Resolving a number of computer issues including security updates.
-Working on password updates.
Hanford:
(Christine)
- Setup a new laptop.
- Modified Solaris OS files to comply with new gateway security policy.
- Started preparing a report of hardware purchases for the year for
Fred
Raab.
- Dealt with problems of not being able to upgrade Solaris on some
Sun
Ultra10's because users have installed software on their local disks
and
have filled the disks.
- Provided help to several users for various problems.
CIT:
(Barbara)
- Worked on costbook items -- changes to reports and web forms, a problem
pasting text into the WBS definition field, and a problem with access
via a
wireless network card. Started working on reports sorted by resource
and
NSF codes.
- Continued efforts on LDAS hardware diagrams.
- Installed new build of WebBase on my pc and pherkab. Have to
do antares
yet.
- Looked into site map creators for LDAS.
- Reworked the LSC site to point to Jennifer's LSC newsletter.
- Made various web site updates.
(Lisa)
- I spent a day and a half updating virus software on the PCs.
I still need to
cover wilson house and the 40m.
- working on building an Ultra 60 for Rolf. This is the CDS framebuilder
that
will be sent to MIT. I've already contacted Keith and told him
that I will
e-mail him the configuration so that he knows what shape the box is
in when it
arrives. I installed the OS, gcc compilers and the second internal
hard disk.
I still have left to do the disk array, VXworks, and epics.
- Working on updating the Sun Visual Workshop/Forte compilers on sirius.
- It was a heavy PC week.
(Sam)
-Worked a few PC issues. Trying to contact a user to get their machine
completed.
(Larry)
-Resolved a few PC related issues. As we have been going through a
number of the
PC's to fix different things we have discovered a number of them need
to be
completely rebuilt or have a number of applications reloaded from scratch.
Some
of the machines were configured incorrectly and others have become
corrupted
through use.
-Worked a few security and policy issues. There is still much work
to be done on
that front. However, Gary agrees that the gateway machines and servers
should be
secure hardened according to the groups technical needs. The people
responsible
for those machines are working on making them more secure.
-Attended the Networld Interop exhibit. I should have attended the
conference
and taken a few of the courses. Things are changing fast. The largest
number of
items being shown were wireless LAN's, GIGE networks, security and
B2B services.
-Bill Tyler has taken over a number of the procurement issues which
has been a
big help. Bill is also working on the installation of the projectors
for the
conference rooms.
-Working a few network issues to make sure we can activate all of the
ports on
the 6th floor of Millikan.
-A number of people have been receiving infected files in their e-mail.
So far
it appears that no-one has opened the files and followed the correct
procedure
in removing them.
-Fixed a few e-mail addresses.
-Repaired a bad file system on the LIGO web server.
-Still getting quotes and tracking down procurement problems. Just
not as many
with Bill helping out.
From Janeen Romie:
New osems for 40m, LASTI, PNI etc.: Pigtail fabrication has been held
up
one more time. Pal Pilot needs to rework all pigtails a second time.
A
new delivery date has not been confirmed. They were due here 4/18.
LEDs and photodiodes have been delivered early. LEDs were not due until
mid July so this is good news. Todd Etzel and company will be taking
over fabrication duties. Boards were delivered at the end of April.
Advanced LIGO: Holding a telecon tomorrow morning with Norna Robertson
about advanced suspensions documentation. Helena and I are working
on
costing in preparation for the review June 18th.
From Peter King:
2.2 40m Lab & LASTI
I met with Alan and Mike Smith to thrash out some details on the
opto-mechanical layout for the 40m Lab PSL table. Also I've been chasing
some hardware prices for extra bits Alan requested.
With the wiring of the PSL enclosure apparently finished. Lee will begin
assembling the reference cavity under the PSL enclosure hopefully by
week's
end, after running the HEPA filter for a day or so.
Lee is getting the parts for the reference cavity vibration isolation
stack
packed, ready for shipping along with an ion pump and its controller.
I had a brief discussion with Ben Abbott and Dennis Ugolini about the
40m
Lab PSL. Giving a semi-guided tour of the table components and the
instrument rack.
Dave Barker sent down the 40m Lab PSL IOC VxWorks EPROM.
From Lee Cardenas:
· New Ref. Cavity chamber
already baked was sent out to MIT-LASTI.
· The rest of the components
to hung the ref. cavity are in preparation to be sent to MIT-LASTI.
· Another new ref. cavity
chamber is ready to be taken to 40m. lab and hung the ref. cavity in place.
From Rich Abbott:
I have been working with vendors to get a rough size for the capacitive position sensors used on the LIGO II seismic isolation platform
From Mike Smith:
40 METER
A new optical layout of the 40 meter IFO with the SRM moved to its final
configuration was completed. Position and angle sensing photodiodes
and a
Tropel frequency analyzer were added to the PSL output beam. The GW
signal
detection system was moved to accomodate the input optics additions.
From: Helena Armandula <ahelena@ligo.caltech.edu>
Silicate Bonding
I was unable to make good sapphire/sapphire silicate bonds because the
1/2" substrate's surface was not flat to specs.
Made some sapphire/sapphire bonds while at Stanford to verify that
the process used was correct.
The results from the bonds made at Stanford were similar to the bonds
made at Caltech.
The 1/2" sapphire substrates were sent for rework.
(The 1" substrates are flat within specs.)
While at Stanford, we took the LIGO coated optic from the chamber (where
Q measurements were taken), cleaned the optic and shipped it to Caltech.
From: Riccardo DeSalvo <desalvo@ligo.caltech.edu>
Japan operation: vacation week, no notable results
Creep facility
Edwin, Run into trouble with the data, compounded by heavy and
intermittent noise; Virginio and Riccardo identified fundamental ground
loop problems. Riccardo and Edwin looking into completely cleaning
up
system and treating the ground problems. Physical plant will
bring new
power line separated from the heating line.
Szabi
Started design for IP actuators replacing the present motorised sled
and
parasitic springs with memory metal springs. Great simplifications
may
follow. Restarting analysis of old data with Hareem
Alessandro
Back in Italy, will supervise Faimond for test ultrasound cutting of
Sapphire, get some spare LVDT coils made (all spares used), advance
with
the vertical accelerometer design.
Riccardo
Working on a bid with Sonic mill for sapphire machining. They
ask 4000
to 6000 $ only for tooling (the machining will be negligible) for he
same job being done by Faimond for 1200 $.
Hopefully will converge before going to Japan (next week).
For additional information about this report, contact sanders@ligo.caltech.edu
