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The LIGO Executive Committee
Agenda for Monday May 1, 2000 will be:
CANCELLED DUE TO PAC8 MEETING
Special Items:
REMINDER: {GHS) It is LIGO Lab policy
that all documents circulated of any consequence will receive an appropriate
DCC number. It is easy to get a number. Furthermore, it is highly encouraged
that documents be submitted electronically in .pdf format. These policies
are particularly important for public presentations. It has come to my
attention that a major fraction of the Lab's presentations at the recent
LSC meeting were not submitted in .pdf format, or with a number, or neither.
Acrobat software is available to all Lab staff. The result of this failure
to follow the policy is that a major fraction of the work in posting the
talks falls to the support staff who must find files, convert files, derive
numbers, paste these into files, scan paper, etc. This is wasteful and
results in these important talks remaining unavailable to interested parties.
WE MUST DO A BETTER JOB ON FACILITATING THE PROCESS OF MAKING DOCUMENTS
RAPIDLY AVAILABLE TO ALL. I ask that each of you make use of the available
tools to use the DCC and to submit files promptly in .pdf format.
No report this week
WBS 1.2 LIGO Operations--Administration
From: Ed Chargois <chargois_e@ligo.caltech.edu>
Nothing to report this week.
| Packages | Faxes | |
| In | 14 | 37 |
| Out | 8 | 38 |
Special Projects: Logged/assigned document numbers for a large list of LSC presentation documents.
From: Esther Cunningham <esther@ligo.caltech.edu>
Press here for ACCOUNTS PAYABLE HISTORY DATA.
From: "Brambila, Ruth" <Ruth.Brambila@caltech.edu>
For a listing of the FY 2000 POETA Accounts see
http://docuserv.ligo.caltech.edu/docuserv/home/accts_ops.pdf
http://docuserv.ligo.caltech.edu/docuserv/home/accts_adv.pdf
The renewed Memorandum of Understanding between the NSF and DOE covering our use of land at Hanford has not yet been signed. We are awaiting word as to any problems between the two agencies.
Rita Torres
Most of the week continued to coordinate food arrangements for the 5/8-5/11 NSF Review; played lots of phone tag. Prepared package to send back to Pronet 3 of the 5 unused pagers. Edited PO log sheets for D. Lloyd to capture some older information.
Obtained Oracle requisition numbers. Spent more time on Expense Reports. Usual P-card activities, chased invoice information. Ordered office supplies. For P. Shawhan created presentation templates in FrameMaker as alternative to the Powerpoint templates. Thanks to G. Billingsley and P. Lindquist for helping me to locate and import logos.
INFORMATION - Anyone interested in using the FrameMaker presentation templates may find them at torres\templates. Please let me know whether they work for you.
[GHS note: We will be reducing support for FrameMaker this year and moving to standardize on Word and Powerpoint. This is necessitated by the increased interaction with the LSC groups who cannot be expected to adopt the very expensive and far less universal FrameMaker]
Dorothy Lloyd
Processing requisitions, invoices and receiving on-line continues. For more detail see "Cost Schedule Control Systems" report by Esther Cunningham. Tracked and follow up on invoice problems.
Continue to monitor contract and blanket order funding levels and alerted task managers when supplements need to be made.
Reviewed payments processed by Esther during the week of April 17. Payments were entered in contract summary sheets and the LIGO database by both Jim and me.
Continue to work on updating the PO Log Books as time permits.
Irene Baldon
No report due to vacation days taken and catchup. Will report thoroughly next week.
Elizabeth K. Wood
Prepared a lengthy report for Phil Lindquist on LIGO labor hours for a future proposal. Thanks to Cindy Akutagawa and Garilynn Billingsley for extremely helpful input in the preparation.
Among other things.
Progress Period from 4.21 to 4.27
Accomplishments:
We are preparing a schedule for the support that is going to be required for proposals, work plans, and reports for the last half of FY 2000. Clearly there is a lot of information needed, and there is a lot of overlap in the schedules that will have to be spread out given limited resources.
The following change requests have
been submitted:
| CR-990028 | WBS 1.1.3 | Beam Tube Enclosure Closeout | F. Asiri |
| CR-000005 | WBS 1.2.1 | Upgrade Pre-stabilized Laser | S. Whitcomb |
| CR-000006 | WBS 1.2.1 | Re-polish Core Optics Components | S. Whitcomb |
Press for the latest Contingency Needs Projection. This list should be reviewed and revised.
From: Kris Duncan <kris@ligo.caltech.edu>
The design of the new staging building at Livingston is proceeding on schedule by John Desmond Associates. Final design drawings will be available soon for review by LIGO staff.
No report this week.
No report
Detector commissioning: Efforts have been concentrated on installing the wavefront sensors. Nergis is here this week to guide this activity. After numerous difficulties with getting various signals to work, everything is now ready. We will now determine the matrix for the feeback to implement the active control.
Beam tube bakeout: Started the y2 bake on 4/25. Temp at 75c and will ramp up later today.
CDS Installation: Alignment Sensing & Control racks at the south and west end stations are complete. We will run the field cables next week. Alignment Sensing & Control rack at the west end station is complete. We will run the field cables next week. Relocated the cable tray and conduit holding the vacuum signals to allow for the installation of the optical lever tables. Terminated the PEM microphones. Ordered Apex PA85's (25). (They will be here in 6 weeks. This is a critical part for driving certain piezo actuators and several have failed. This will give us an ample quantity of spares.) Built and installed all the data acquisition cables that run from 1X5 to IOO and PSL (1X2 & 1X3). Also, installed 3 additional communication cables to the PSL enclosure for general computing and a new video cable which runs back to 1X22. Installed all the filters and jumpers in the 7 data acquisition chassis and installed the chassis in 1X5 (3) and 1X22 (4). We have received, from Pasadena, all 11 DAQS chassis required for the site. Connected 60 suspension points into DAQS. In the process of verifying each.
Report items covered elsewhere
Report items covered elsewhere
| Installation:
Livingston |
Commissioning:
Livingston |
Other
Science/Engineering
Activities |
The output of the pre-modecleaner (PMC) has been aligned to traverse its old path. The output power at the PSL/IOO hand-off point was measured to be 7.25 W, with a Scientech AC50HD calorimeter.
The new high voltage power supplies for the PMC and the phase-correcting Pockels cell amplifier have been installed and replace the two HP power supplies and Bertran high voltage power supply.
After optimizing the temperature of the laser, the output of the laser was measured to be 8.80 W, for a diode current of 25.85 A and a diode temperature set point of 23.4 degrees. The temperature tuning resulted in a gain of approximately 200 mW.
The new reference cavity and its associated hardware, vacuum chamber, heater jackets and insulation have been installed on the PSL table. The pressure in the vacuum chamber is approximately 1.0E-9 torr at present. The cavity visibility, using the dip on reflection, is approximately 84%.
Both the PMC and frequency servos have been locked simultaneously. Tweaking of the servos will take place next week, when the new frequency servo is installed.
Lee Cardenas
-finished hanging and aligned
the new upgraded Ref. Cavity that will replace the existing one at
the 2K Interferometer in LHO. Pictures and measurements provided.
-turned it on and tested
the MOPA # 107 10watt Laser the one that I installed in the optic
Lab at LHO. I have checked all the parameters and I let
it run for a whole hour. the power is 10.65 watts. Lightwave claims
11.6 watts as the optimum power. It needs small alignment to get
the power wanted. All the optics inside the MOPA are well secured.
I have not found nothing loose.
-made some sketches and
working on the drawing for the new Periscope that will replace the existing
ones for the beam output from the Laser at LHO, as well as
the ones close to the reference cavity.
-have taken apart the old
PMC ( small PZT) and I will clean the optics as well as the cavity. I will
assemble one completely and will be sent to LLO.
Continuing installation and test of chamber video cameras for core and input monitoring. The video system has proved very popular and useful, so there has been some growth in scope arising out of commissioning on the 2k interferometer; MZ is putting together a revised installation configuration, inventory and (with Dave Barker) channel assignment.
Ken Mason
Supplied documentation and
parts for the ISC table installation happening in both Hanford and Livingston
Mike Smith, Ken Mailand,
Janeen Romie
The alignment targets for
the ITM, FM, BS were designed, manufactured, and assembled. Several remaining
parts for the MMT3 and MMT2 targets will arrive at LHO on 4/27. The
HAM viewport window target fixture was completed and shipped to LHO, awaiting
assembly next week. A target for aligning the PO mirrors was completed.
Mike Smith, Ken Mailand,
Betsy Weaver, Janeen Hazel
PO Telescopes and PO optical
train:
A new HAM viewport alignment
fixture has been designed and is being fabricated.
We have taken MC1 out of HAM7 and moved it to the optics lab to change its suspension wire, so all cavity mirrors will have the same bounce mode frequency. Before taking out MC1 we checked and recorded the beam centering on MC1 and MC3. The beam was centered within 1 mm vertically on both mirrors but about 2-3 mm off center to the right on MC1 and the same amount to the left on MC3 (looking at the front face of the optics), that is, with respect to the center line of MC1-MC3, the beam was parallel displaced towards MC2 (South). To confirm this we also inspected the beam centering on SM1, and we observed the same amount of shift (towards South).
LHO 4k IFO: Parts for six
small optics suspensions have been shipped to LHO, where they will be vacuum
prepped.
Mike Smith
The structures for the RM
beam dumps for HAM2, HAM3 were completed and willbe cleaned and baked at
LHO. The glass is being manufactured and will be shipped to LLO.
Sander Liu, Paul Russell
Received the last partial
shipment of 100 filter modules from Frequency Devices. All units were shipped
to LLO.
Bill Kells
Remnant analysis of recent
2K arm run data, especially the question of the true mode match into
the x arm.
Led by Nergis, we have embarked on bringing up the WFS system. After numerous puzzles, it now appears that all heads and electronics are working. Confusion cleared after it was discovered that our WFS heads had a different attenuator switching arrangement than had been used before. We have completed a system check out of al hardware and software and have measured some signals on the wavefront sensors due to angular drives applied to the PZT steering mirrors.
We also completed many "housekeeping" chores, including: setting MC LO drive level, LO phase, and RF modulation level, as well as fixing an electronic problem in the FSS servo. We investigated the MC loop transfer function (it looks good), and hunted for saturation (none), and offsets (found and diagnosed one, but have not fixed it) in the MC servo electronics.
Steve and Sany are measuring
the position pitch and yaw spectral densities for all MC optics for a few
gain settings to find the optimum SOS local damping settings(which minimizes
the rms motion of the optic). Sany has been working on measuring frequencies
and Q's (in air) of LOS violin modes.
Started work on writing code for the digital suspension controller. Most of the I/O routines already exist in the ASC and DAQ code. I'm starting by putting these routines into a library and then will start on the main thread. Hope to do some initial testing next week.
I have spent most this week machining parts for the next ETM transmission monitor that is due to be finished in early May. I am waiting for the breadboard to be delivered from Thorlabs-it is due in either April 27 or May 4- then it needs to be machined.)
The three remaining uncoated Recycling Mirror substrates were checked for inclusions. All three substrates meet the inclusion spec.
Peter is going to come to
caltech next week for other issues so it will be a good time to evaluate
if there are any tangible advantages on doing this exercise. One of the
advantages is that if the itf is available, we are probably ready to run
the test now.
This week we corrected the problems we were having with our PSL, and
we are
now able to acquire lock quickly and easily. The lock is also
quite
robust, remaining stable with the Pockels-cell loop either open or
closed.
The problem was, as we had suspected, that two of the op-amps in the
fast
(PZT) loop were railing in response to a dc offset. We were able
to
compensate for most (but not all) of this offset by tuning the "input
offset adjust" pot inside the servo module. The remaining dc
offset was
nulled by adjusting the common and fast gains, each of which seemed
to
contribute to the offset with different signs. With the dc offset
removed,
the system performed wonderfully. We also note that the Pockels-cell
amplifier no longer exhibits a high-frequency railing, which had been
a
problem in the past.
We have extracted a Pound-Drever-Hall error signal from our mode cleaner,
with the mirrors held in place by their earthquake stops, and we have
been
looking at noise in this fixed cavity. We see some "jitter" between
the
frequency of the laser and the length of the cavity, which appears
to be
due to motion of the suspensions. By locking the laser to the
mode cleaner
(which is much easier than locking the mode cleaner to the laser) and
observing the error signal, we took a spectrum of this noise.
The spectrum
is quite broad, and we suspect that it is acoustic in origin, rather
than
seismic. This agrees with the conclusions of one of last summer's
SURF
students, Sam Makonnen, that the dominant source of excitation on our
stack
in air is acoustic.
No report this week
Matt is working with Rolf to port the lsc code for cds.
Thermal noise
Biplab is working to implement the thermal noises based on Sam Finn's
work.
Most of the noises can be implemented using digital filters.
Adlib
sos based digital filter is implemented.
The 3d suspended mirror primitive is tested.
alfi
Version 4.0.9 has been relieased which looks quite stable. After a
little
bit of testing by limited people, it will be available for generic
use.
This is still beta quality.
From: Stuart Anderson <sba@srl.caltech.edu>
Stuart: Starting work on incorporating data validation checksums to
the
main LIGO data archive.
Continuing to setup new server for dataconditioning API.
Researched available ftp daemons in search of more security and configurability.
Enabled the starting of nttcp on all systems for network benchmarking
from any
computer to any computer.
The LDAS also continued to make progress on new code and functionality
this week. Much of the development and implementation work for the
data-
ConditionAPI matured this week. Among the most significant achievements
were the completion of PERCEPS filters to support LAL standard LaTeX
docmentation within Source Code. Also, several of the data conditioning
algorithms were wrapped up using SWIG for the first time this week,
making
these algorithms available to the TCL interpreter that the dataConditionAPI
runs in.
The C++ classes used by the wrapperAPI to communicate input LDAS data
from the master process to all the slave processes was finished this
week.
The next step is to develop the classes used to communicate the data
products
from the dynamically loaded libraries running on the slaves back to
the
master where they can be injected back into the LDAS system.
A problem reading frames at Hanford was identified this week. The problem
is associated with the integration of the version 4 compatible FrameCPP
I/O
library into the framebuilder. But the exact source of the problem
is very
difficult to identify at this time since the problem only shows up
when the
FrameAPI is run at Hanford and not here at CIT.
MIT:
Nothing to report.
Livingston:
Ordered new PC's and preparing for the increase in computer usage over
the
summer.
Tom is now working with Shannon R. who is taking on some of the Sys.
Admin.
duties at this time.
Hanford:
Oudone has installed the latest version of Exceed on the PC's and completed
installation of the CIT licensed Nortons Anti-Virus.
Preparing for future computer upgrades and usage.
CIT:
More changes to the WEB servers. In the final stages of getting docuserv
moved
to a new server and off of gsparc.
Discussing the transition to Office 2000 with the other LIGO locations.
Suresh has been working on setting up and debugging DHCP.
From: Jordan Camp <jordan@ligo.caltech.edu>
SAPPHIRE
We have received 1 inch c-axis and m-axis sapphire substrates, coated
by REO. The
coating transmission design was 100 ppm. A ringdown of a cavity composed
of the
c-axis part and a previously measured optic showed the c-axis part
transmission
to be 80 +/- 10 ppm, within the design tolerance. A measure of total
coating
absorption of this cavity showed the coating absorption of the c-axis
part to be
less than 1 ppm. So it appears possible to
produce super mirrors on a sapphire
c-axis substrate. Next we will
repeat these measurements for the m-axis piece.
From: "Ryan C. Lawrence" <rclawren@ligo.mit.edu>
Core Optics Compensation:
Spent some more time looking for a clever way to get the equations for
cylindrically symmetric thermal deformations into a usable 2D elliptic
format. It appears I'm not clever enough, so I'll probably have
to use a
brute force 3D modeler. I've put the modeling effort on the back
burner, for now.
Instead of a raster-scanning pattern, I've switched to an polar-type
scanning pattern, and have re-rigged the galvo electronics accordingly.
I've got the CO2 laser aligned through the galvos and into the tank
(and
onto the test optic). I'm going to switch out the old heater
assembly
tomorrow (thursday) and install the shielded ring heater (which has
a
clear aperature through which the heating laser can actuate) along
with
some additional insulators and reflectors.
From: Riccardo DeSalvo <desalvo@ligo.caltech.edu>
Soft isolation
Szabi
IP oil bearing still in production
Testing thermometer acquisition for creep measurement
Earthquake simulation ongoing
Supported GASF Ham simulation ongoing
Alessandro
Compared new accelerometer with Barry Controls geophone (model unknown),
performances agree to the seismic activity floor of ground and ?K stand.
Need better isolation to characterise the new accelerometer floor.
Waiting to go on IP.
Started electropolishing setup for thin joints.
Virginio
Encountered without recognising ground tilt problem from water swelling
cork under Synchrotron concrete slabs. Delayed control and damping
startup.
Found limits of non linearities with old voice coil actuators,
soon to
implement the zero gradient ones.
Akiteru
Simulation of TAMA-SAS recoil mass and recoil cage controls.
Recoil mass controls are simpler, otherwise have similar performances.
Present TAMA coil driver noise will dominate the mirror noise at about
10-20 m/RootHz
Could downsize controller because SAS will deliver much smaller residual
R.M.S. movement. Also could use multiple level actuation.
Riccardo
Received new blade testing setup for MGASFs, assembled works OK
Flavio, Alessandro, Szabi
Measured actuation capacitance with glass mirror mass, 50 pF, could
use
higher value idf we do not find a better ferrite.
Achieved a drive circuit of Q=140 at 350 kHz, 400V p-p with 4 V drive
and 100 mW power.
Next step with new ferrite at 20 kHz and hopefully Q=500, power
consumption will decrease.
Receiver the laser drive to pump the coils through Marconi drive.
From: GariLynn Billingsley <Billingsley_G@ligo.caltech.edu>
Core Optics
Identified topics for this year's Advanced R&D. The topics
covered under
the heading of COC are:
Identification of alternate coating sources,
Improvements in the large optic cleaning method,
Improvements in the IR interferometer,
Development of off-wavelength analysis for the IR interferometer,
Further characterization of absorption in Fused Silica.
From: Helena Armandula <ahelena@ligo.caltech.edu>
We received two coated sapphire samples from REO. Testing will
start this
week.
(SEE JORDAN's RESULTS ABOVE)
For additional information about this report, contact sanders@ligo.caltech.edu