The Project Control Meeting
Agenda for Monday June 8, 1998 will be:
(Meeting time: 10:30 am Pacific Time)
WBS 1.1.1 Vacuum Equipment(Worden)
1. Gate Valves:
a. WGV12 (Y-mid BT valve) This valve showed evidence
of a torn O-ring but on further inspection showed
that
the inner O-ring had been cut by the groove edges
rather than
being pulled apart by "stiction". The inner groove
has sharp edges as well as significant damage or
repairs.
It is unknown how or why the groove was so bad.
GNB
president Stan Cohelan was able to view this valve
and had no information. It is likely that this gate
will be replaced or remachined.
b. WGV11 (Y-end station valve) Has been pulled today(Wed).
The bellows looks fine but was noisy so has been
replaced.
The gate will be inspected tomorrow.
c. WGV17 (Y-end BT valve) has now had its gate inspected
as well. This valve had gone through a PSI 10 day
bake
process and indeed had about 6 inches of O-ring
out of the
groove when pulled. The groove measures ok however.
Calibrated
thumb measurements suggest that the O-ring requires
about 20-40 pounds per linear inch to reinstall
it.
PSI and GNB believe this valve to be acceptable
and
that the O-ring will not pull out provided that
the
valve is baked in the open position in the future.
d. WGV19 (X-end BT valve) has passed PSI's
inspection and awaits in-situ testing.
e. WGV20 (X-End station valve) Needs new gate or
fatter O-ring.
2. Installation activities:(Kyle Ryan)
X-arm end station:
X-arm end station:
PSI and GNB's inspection/repair/adjust-
ment of the BT 44" gate valve is complete.
The VE 44" gate valve is waiting for a re-
placement gate.
X-arm mid station:
No change.
Corner Station:
PSI will begin heating the diagonal section
of the VE later today.
Y-arm mid station:
Visual inspection of the Y-2 BT 44" gate valve
revealed a problem in the machining of the gate.
The thickness of the gate in the area outside of
the largest O-ring is specified to be 0.030" less
than the thickness of the area of the gate inside
the largest O-ring. It was found to be 0.060" in-
stead. The end result of this was to cause
damage
to the O-rings. A replacement gate will have
to be
utilized.
Y-arm end station:
One of the O-rings on the BT 44" gate valve's gate
was found to have come out of its groove partially.
It is proposed that this problem is the direct re-
sult of baking the valve in the closed position.
LIGO witnessed the reinstallation of this O-ring
into its groove. This valve was reassembled
and will
reenter service. The VE 44" gate valve is
being in-
spected at this time.
Livingston Installation (Allen Sibley)
PSI has completed major equipment installations in both end stations.
Work
on the installation in the corner station is under way, with 2 BSC's
and an
80k pump bolted in place. Piping and electrical installation is being
done
in the x arm end station.
CBI is currently set for performing a leak test of the x arm mid station
valve.
(GHS note: This is the one that had a crashed
gate, see Larry Jones' report below)
The entire valve has been bagged and a leak detector connected to
one of the 2500 l/s turbo pumps on the fore line. Clear indication
of a
leak was indicated when He was introduced. Modification, of the bag,
is
being made so that the location of the leak can be determined.
1.1.2 Beam Tube (L. Jones)
a. Tube section installation status
(Livingston site):
(running totals):
Inside Leak Leak
Final
Welded
Repairs Tested Failures Aligned
as of 5/26*: 389 22
388 0 0
as of 6/2*: 400
22 400 0
0
* Includes gate valves as the
finish "tube sections"'
Installation will be complete
when weld, leak test,
and alignment all reach 404.
An incident
occurred 5/28 on the X arm midstation gate valve:
the drive
belt was removed with the gate in the open position
and the
gate locking pin in the disengaged position. The gate
quickly
descended to the bottom of its travel. Measurement of
the gate
screw position indicates that the gate lockover guides
(travel
stops) are likely broken, sheared at the welds to the
valve body.
This is reinforced by the fact that the valve has
approximately
200 l/s conductance, when it should be sealing
internally.
A helium bag test on 6/3 has detected an external
leak of
1E-5 to 1E-6 (still being evaluated); options are being
considered
for repair.
The weather has been very hot
recently, with no rain. The BDF
is not holding the dew point as
low as previously, but this
should not be a problem. All tube
sections have now been
installed at the Y1 module, and
the installation of the
corner station termination valve
is in process. Completion of
the Y2 module is about one week
behind Y1. The first baffle
with a cracked weld at Livingston
has been discovered and set
aside. Ample spares will keep
this from becoming a problem.
BDF air flow performance since
5/26:
Particulates (0.5u)/cu ft: 28
(max., any day)
Dew Point, degrees F: 11-26
Temperature, degrees F: 59-70
b. The monthly beam tube project
status review meeting was held
at the Livingston site on 6/2.
Significant issues were as
follows:
1. We discussed various considerations for repair
of the X arm mid station valve, as mentioned above.
Since the external leak check indicates a leak, we
will attempt to qualify the rest of the X arm (with
a bag of masking gas to exclude the leak from giving
an air signature) in order to allow CBI to move to
the Y arm and start testing. CBI may be ready on the
Y arm for pumpdown in early July. In the meantime,
PSI can evaluate the damage to the X mid valve and
we can determine the best means for repair. This
may involve cutting a manhole in the side of the tube
or removing the valve for return to GNB.
(GHS note: The statement above about qualifying
the 4 km arm has not been decided upon by the Project though it is quite
likely that we will follow this course in order to avoid risking introducing
gate valve lubricant into the tube in an attempt to move the valve.)
2. CBI will review COR 027 (biweekly
RGA measurements
on the X arm) and propose how
the billings will be
made if the two measurements are
not made on a
regular 2 week cycle.
3. CBI needs to know the equipment
that we plan to
purchase by 6/5 so that they can
evaluate other offers.
Jones will circulate a list by
e-mail within LIGO.
4. The RGA fiberoptics hubs have
been replaced with
a different model, but their current
location is
apparently still in Europe. CBI
will find out schedule
details. They are to be tested
with the long fiberoptics
cables belonging to LIGO prior
to delivery. CBI has a
backup plan in the event that
a leak location is
required.
5. CBI, LIGO, and PSI will coordinate
the positioning
of the Y2 end station valve when
it gets set, due to
the presence of an installed 80K
pump next to that
position. This is the first time
that PSI's activity
came prior to CBI's valve setting.
6. CBI plans to start taking through-the-enclosure
GPS measurements on the X arm
control supports next
week, and to place the Y arm supports
in their "final"
positions starting mid-June.
7. Jones will give CBI instructions
for any special
packaging/shipping of deliverables
due at the end
of the contract. This will at
least include the
coupon testing system at Plainfield,
IL.
c. The Magnolia Beach equipment will be auctioned
off at the
fab shop on 6/16.
d. Planned meetings:
7/1/98: Completion Review, Livingston site (performed
early due to manpower availability)
1.1.3 & 1.1.4 BTE and Civil Construction (Fred Asiri)
>
> >>Issues:
Hanford:
> 1. Water System Integration: Request for Quote will be
issued
this week.
> 2. Final Vane Axial Fan Testing: The final field test
data were
> received from the contractor on 5/14/98.
Paul MacCalden transmitteed
the final report on 5/28/98.
Livingston:
> 1. Vane Axial Fan Testing: Contractor has forwarded the
fan test
> data to Parsons. P. MacCalden of Parsons
has reviewedthe fan
> test data. Parsons transmitted the
final report on 5/28/98.
2. Electric Power Quality: Possible problem due to
excessive voltage
imblance between the three-phases
could have caused the motors to
trip. The maximum allowable imblance
for the motor has been set at 2%
by the manufacturer.We are investigating
the incompatablity between
the provider of the electric power
and setting of the motors.
> 3.John E. Chance and Associate Inc. John E. Chance has
transmitted their
comments and marked-up a copy of Contract
accordingly. We have
incorported
their comments in the final contract
document. Contract is ready for
signiture.
I am presently at the Hanford site, in order to assist
in the 1st Article
Testing of the HAM.
Hanford Construction (otto Matherny)
Levernier
Consolidated Punch List
Total punch list items remaining- 8
Total Corrected-
1
Total Signed off-
1
Siebe completed the connection between
the FMCS and the Either net.
OTHER ITEMS
1) Started a rodent control program in Y-1
for $575 initial cost
with $150 monthly for upkeep.
2) Successfully ventilating a BTE module with two 3' diameter fans.
3) Started a small T&M contract to plug
all the mouse holes in Y-1.
Livingston Construction (Gerry Stapfer)
The site has not received any rain for the past month.
1.0 HENSEL PHELPS
--Working on outstanding notice to comply and punch out items.
Putting
together as builts and O & M manuals.
BERNHARD MECHANICAL CONTRACTORS-continuing the reworking of coils
in the
HVAC system. Completing the AHU #1 air coils.
2.0 WOODROW WILSON
--Installing B unit doors and hardware along Arm 1.
--Grouting , patching bug holes and caulking around the installed BTE's
along Arm 1.
COASTAL BRIDGE--Setting BTE's on Arm 1. 30 'C' units were set
today.
As of today, 2617 BTEs have been cast, 2369 BTEs have been approved
and
2405 BTEs have been installed.
Issues
Resolve power supply problems with Demco and Trane
chiller shutdowns.
Resolve outstanding Change Estimates
Date: Thu, 4 Jun 1998 16:44:00 -0700
From: stan@ligo.caltech.edu (Stan Whitcomb)
----------------------------------------------------
DETECTOR GROUP -- Whitcomb/Shoemaker
(WBS 1.2, 1.3)
----------------------------------------------------
-----------------------------------------------
Implementation Group -- Mark Coles/Fred Raab
-----------------------------------------------
----------------------------------------------
Interferometer Sensing and Control -- M Zucker
(WBS 1.2.1.1.6, 1.2.1.1.7)
----------------------------------------------
General/administration (Zucker)
-----------------------------------
Issued baseline and weighted milestone system corresponding to March
replan of ISC fabrication. This included requested redistribution
of
contract manpower scope from Operations into Construction (net ~ $550k
added). Expect to report against new milestones for month-end
June.
For May report, assigned fractional completion calculated to correspond
to expected accrual under "new" system.
Currently trying to get this manpower delta entered into the EAC
spreadsheet before I go on vacation next week (need to break down EAC
by labor category, not done previously).
ISC meeting @ Caltech 5/27 (Zucker)
-----------------------------------
Held a successful meeting 5/27 at Caltech, partly with participation
from Rolf Bork, Daniel Sigg and Mark Pratt on ISC Diagnostics.
Key
issues were ISC/GDS diagnostics, IO controls deliverables, and
preparation for the ASC and LSC FDR's (end of July). Highlights/key
findings:
-More power at the dark port: We will need to use
8 LSC photodiodes instead of the planned 4; see
below.
-Differential and common mode control designs meet requirements:
outstanding issues left at PDR time have been
resolved. Some cleanup tasks set before FDR
(see below).
-Analog wavefront sensing control for the mode cleaner;
Due to schedule and resource constraints we are
scaling back
the IO WFS controls to a simpler analog implementation
(end
functionality will be maintained of course).
Digital
electronics and software resources have been redirected
to
accelerate GDS and DAQ systems, as well as the more
challenging
main interferometer controls (for which digital
signal
processing is actually required). Prototyping
and training
functions previously assigned to the IO digital
controls
development effort will be redirected to crate-level
tests
focussed on identified issues.
-Lock acquisition design progress (see below).
Acquisition threshold velocity has now been increased
to a
level where reliable acquisition is predicted without
extreme
measures (e.g., guided acquisition). Time
to lock of order 10
seconds is predicted (caveat: models do not
yet include
effects of residual misalignment during acquisition).
-LSC digital loop test: worked through various problems relating
to lock/run transition, network interruption glitches,
etc.
Progress slowed by laser failure (see below).
Initial alignment (Zucker for Mason, on medical leave)
------------------------------------------------------
Myron got about 95% of optical lever, video camera, and chamber
illuminator machined components under contract this week and ordered
optics & assembly hardware for same. Three minor parts (cover plates
and a spacer block) were held back pending finalization of cabling,
connector and photodiode box dimensions. Matt Smith is working
these
dimensions out and will issue those drawings for fabrication shortly.
Also on Matt's plate are optical lever supports at BSC and
manifold endcap locations (pending more info on nearby equipment
interferences).
Received full complement of Sony video cameras and Melles-Griot optical
lever beam expanders. A minor snag with chamber illuminators;
Purchasing left quantity and part number off the PO (also, quotation
had expired by the time the order went through). Myron got this all
resolved yesterday and the vendor is now moving (at the previously
quoted price).
Pulnix has evidently stopped production of the TM540, our
"IR-sensitive" video camera designated for RM and BS monitoring. We're
going back to our list of other vendors to locate a substitute.
Newport informed us that the new "high sensitivity" autocollimator
model has been delayed and will not ship for another 3 months.
This
might still make it in time for us, but we're waking up Plan B just
in
case (change the front-end gain in one of the current LAE-500
production models to make it work with low-R optics).
LSC Acquisition Control design (Ware)
---------------------------------------
[5/28/98]
After going back to the beginning, and
implementing phases in SMAC, I found that the IFO models used for
designing the controllers were incorrect. I verified the SMAC
transfer
functions with Twiddle, up to an additive offset. Based on the
new
model, I was able to implement a stable controller (gain margin 18
dB,
phase margin 45 degrees) for L- with a threshold velocity of at least
1
um/s, and which maintained lock with ground motion of half the worst
case seen at Livingston. This controller removes the need to
switch
controllers during acquisition, though a switch still must be made
to
detection mode. I need to make new models for the other degrees
of
freedom (which may mean further changes to SMAC), and further test
my
new controllers.
[6/4/98]
I don't really have much more to report than last week, just
consolidating and documenting my gains.
ISC design/testing (Fritschel/Mavalvala)
-----------------------------------------
LSC Detection Mode Controls: 1) In order to make a final cut at the
detection mode servos and signal conditioning design we have recently
revisited the optical plant. We have obtained the outputs of
the
current 'baseline' FFT simulation performed by Bill K. This simulation
shows a suprisingly large carrier contrast defect (2.8e-3, with most
of
the power in modes m+n>2) -- 4x larger than the previous 'baseline'
simulation. While it's true that the arm cavity power is not greatly
affected by the increased contrast defect, the optimum modulation index
and the total power at the antisymmetric port go up considerably.
The model included:
* Calflat mirror maps scaled to lambda/600
* coating maps for the mirror surfaces (measured two layer AR coating
maps are scaled for many-layer HR coating)
* thermal lensing
* finite sized beam splitter with elliptical beam clipping
We are looking into which of these effects most significantly degrades
the contrast defect, but meanwhile with these results, ISC now expects
to detect ~1.2 Watts of power at the antisymmetric port (compared to
600 mW from previous calculations). This doubles the number of
photodetectors required at the AS port -- we now plan for 8 detectors.
2) Signal conditioning design (anti-aliasing/prewhitening,digital
filtering, dewhitening) for the differential mode controls is nearly
complete.
3) We are adding in the vertical 'bounce' mode in the common-mode
controls model.
4) Started design of the test mass (pendulum) damping feedback paths
for the Michelson and recycling cavity servos.
IO Mode Cleaner Alignment Controls: The tip-tilt actuators and
drivers
were recieved from Physik Instrumente. Preliminary measurements
of the
input refered noise of the drivers is about 5 uV/rtHz. The bandwidth
(with no capacitive load) was measured to be 4.5 kHz, which is better
than speced. With the 4 uF capacitance of the piezo, we expect it to
be
a few hundred hertz (to be measured soon).
Phase Noise Interferometer (Fritschel/Daw)
------------------------------------------
o Two weeks ago, just as we were about to test a new version of the
digital servo that incorporates a state transition to 'detection
mode', the NPRO laser lost ~75% of its power in the course of a
minute. Last week Haisheng & Ed replaced it with another NPRO and
realigned the input table and interferometer. The interferometer
is now operational again, and locks well with the analog servo.
Attempts so far to lock with the digital servo have not been
successful.
#MZ note: this NPRO is being sent back to Lightwave.
Our
optical shutter test setup
was the laser donor. The PNI will
disappear in ~ 4 weeks so
we're just pushing back the shutter
test.
o On a more exciting note, Ed & Mark P have got the digital test
point
interface working using the reflective memory loop between the PNI
crate and Mark's GDS crate. Both stimulus and response data have been
written into and read from the reflective memory, using Mark's
arbitrary waveform generator software on one end, and a special
version of Ed's PNI servo software on the other. Now to get the
interferometer locked so we can perform a swept-sine loop measurement
using this system ...
-------------------------------------------
Lasers and Optics -- J. Camp
(1.2.1.1.2, 1.2.1.1.3, 1.2.1.1.4,1.2.1.1.5)
--------------------------------------------
Prestabilized Laser -- Peter King
--------------------------------------------
- Measurements characterizing the behaviour of the current shunt
actuator and the temporary intensity stabilization servo were made
in
order to improve the overall performance. Various modifications
were
made to both the current shunt actuator and the intensity stabilization
servo to increase the dynamic range and gain respectively. However
the
combined modification did not yield the level of intensity noise
suppression expected. The reason(s) for the observed behaviour
of the
servo was(were) not understood.
- In light of the behaviour of the current shunt actuator, R. Abbott
and P. King met with J. Camp and S. Whitcomb to show the results
obtained. Whilst it was agreed that the current shunt actuator
approach promising, time constraints suggested that an acousto-optic
modulator (AOM) be used to stabilize the intensity, perhaps as an
interim solution.
- In trouble shooting the intensity servo, R. Abbott observed that one
or more op-amps in the servo were overloaded and that strategic
placement of poles and zeroes markedly improved the performance.
The
intensity stabilization servo now works as expected, ie any increase
in
servo gain is observed in the intensity noise.
Input/Output Optics -- Dave Reitze, UF
-----------------------------------------
David Tanner is spending three days at LIGO using the HAM mock-up and
a
spare small-optics suspension to help develop the input optics
installation procedures.
Procurement and Machining -
All orders for IOO components to the commercial vendors have been
placed.
The machined parts for the fixed, in-vaccum, mirror holders have been
recieved from the shop and will be assembled to test for fit before
shipping for bake-out.
The Faraday mounts should be finished today. The periscope is
up
next.
Mode-matching measurements -
After a lot of electronics headaches, Qi-Ze and Rana have made good
progress with the demod boards this week. Both head board/demod sets
are ready for operation, probably minus some last minute tweaking with
all the chips warmed up. The two head boards are tuned to have Q of
about 10 for each channel.
Rana is developing a good signal processor/lens driver in LABView,
but that shouldn't take more than this weekend.
Optics Measurments -
The IAP group is now making measurements on uncoated optics at the
level of lambda/1000 or better. First set of measurements was
performed to try to measure the radii of curvature (RC) of the MMT3
master blank from GO. Because the RC is so small (spec'ed at
25.16 m),
only a 1 cm area could be measured at one time. The results are
promising; different measurements of the same area gave results of
25.165 m and 25.156 m, quite close to the specification. They
are now
looking at different portions of the mirror to check uniformity of
RC.
High Power testing -
Performed long term exposure tests of a LiNbO3 based-AOM
(acousto-optical-modulator) for possible implementation as an intensity
stabilizer in the PSL . First, exposed the AOM at the maximum power
(~9
W) at a deflection efficiency (defined by deflected power/incident
power) of about 40% for 1 day and compared the transfer function
(gain
and phase delay) with the initially measured transfer function. In
the
whole frequency range (100 Hz - 100 kHz), no substantial change has
been oberved. Next, increased the deflection efficiency to ~100% and
repeated the experiment. There was no change observed in the transfer
function. (Thanks to Jordan Camp for assistance on the measurements!)
Measured the thermal lensing of the AOM using the same probe (HeNe
laser) and pump (10 W YAG) setup as the previous thermal lensing
measurement of Faraday rotators and EOMs. Clear thermal lensing was
observed in the YAG laser power range of 2 - 10 W. The observed slope
of the optical path change versus YAG laser power was the same as that
observed previously in the LiNb03 based EOM.
Core Optics Procurement and Metrology -- GariLynn Billingsley
-------------------------------------------------------------
The IR interferometer is on schedule for delivery at the end of June.
The lab will lag delivery of the instrument slightly due to delays
in
acquiring an air handler. The preliminary work of software
integration for the instrument will be unaffected by the lab delay.
CSIRO has shipped two of the 2K ITMs, Beamsplitters did not ship due
to
a misfit with the carrier. We are working a fix - long distance.
Core Optics Coatings -- Helena Armandula
--------------------------------------------------
REO-COC's coatings: To date, we have received coated from REO: 4 ETM's;
2 FM's. Two more coated FM's are on their way to Caltech. Four RM's
are
partially coated and scheduled to be finished by the end of the week.
Caltech optics cleaning lab: We are conducting some tests to finalize
the concentration of the cleaning solution as well as the temperature
the solution should reach to be more effective. There where some
concerns about the long lead times to receive nitrilite gloves from
Ansell-Edmont; when contacted, they informed me that because of the
great demand (IBM buys them all), they added more manufacturing lines
and that distributors now have good stock. A new, cleaner glove of
the
same material is coming soon. Last Friday, at Hanford, we wrapped-up
most of the lab. issues, one remains outstanding: visual means of
checking the optics after they have been cleaned.
Core Optics Support -- Michael Smith
------------------------------------
PO TELESCOPE:
K. Mailand has completed drawings for a wooden mock-up of the
reflective PO telescope. Three PO telescope mock-ups will be built
with
working gimble mounts, so that alignment prodeedures can be developed
within the constraints of the LIGO HAM mock-up facility. D. Rose has
completed the design of the ETM PO telescope, using a cost-effective
on-axis refractive design approach.
BEAM-DUMPS:
A. Badalian, working with Angel an AUTO CAD Mechanical Desktop
consultant, has developed a 3D model of the BSC8 beam-dumps; and the
dumps are being placed inside a 3D model of the BSC chamber. The 3D
models facilitate placement and mounting of the beam-dumps and will
enable the precise determination of potential conflicts with the ISC
optical lever beams.
ASAP OPTICAL MODEL:
A discrepancy was discovered in the graphical output of the ASAP
optical beam model, due to plot file conversion accuracy. The graphical
error will be reduced by plotting smaller regions of the ASAP file
and
combining the regions into the overall ILD. The plotted data will
ultimately be checked with the numerical beam coordinate data generated
by ASAP.
COS PARTS PROCUREMENT:
J. Kern is assisting Dave Tanner of IOO in setting up a mock-up of
the
IOO SOS in the LIGO HAM mock-up. He is in the process of generating
specifications for the various COS assemblies.
M. Smith has been on vacation during the last two weeks.
--------------------------
Isolation Group -- M. Fine
--------------------------
Seismic Design (Mike Fine)
--------------------------------------
1. In-Vacuum Hardware:
A final proposal was sent to Allied on the fix for the 1st article
HAM
support table that Allied has completed. It was agreed that the easiest
approach would be to simply cut a deeper chamfer on the part. Allied
will
make the change, clean (not bake) the hardware, and ship them to Hanford
before 6/12.
2. Fine Actuator:
Hytec has ordered a single channel of capacitive feedback (sensor +
controller) from PI as an add-on to the already ordered PZT stacks
with
strain gage sensor. It was decided that the capacitive feedback
option would only be considered with a decentralized electronics layout
(i.e. on small rack per pier instead of a central rack per system)
so the
cables can be kept short (1 meter).
3. Coarse Actuator:
Hytec has reviewed the feasibility of multiplexing the coarse actuation
system to reduce the total part count and cost and put together a cost
breakdown with and without multiplexing. These results were presented
to us by Tim Thompson during his visit today.
4. Air Bearing Assembly:
Specialty Components has finalized the revised delivery schedule for
the first article phase. All 20 bearings are expected to be completed
on
June 17.
Suspension -- (Janeen Hazel/Mark Barton/Mike Fine)
-------------------------------------------------------------------
1. LOS Fabrication:
Brookfield was given authorization to proceed with the fabrication
of
the LOS height adaptor. This authorization is contigent upon Brookfield
correcting the workmanship problems identified in the inspection of
the
first article as well as those discussed by Bill Tyler in a visit to
Brookfield on June 3rd.
---------------------------------------------------------
Detector Systems Engineering -- D. Shoemaker/D Coyne
(WBS 1.2.1.1.9)
---------------------------------------------------------
David is on travel.
Global Diagnostics System
(Rolf Bork, Paul Govereau, Mark Pratt, David Shoemaker, Daniel Sigg)
--------------------------------------------------------------------
This week the GDS arbitrary waveform generator, running on our
prototype excitation crate, was finally hooked into the PNI digital
control loop. After a little debugging we find that the signals
are
really being injected into the digital control loop and the PNI
controller is writing back a digital channel into reflective memory.
We are synchronizing the crates with a reflective memory interrupt
and
a shared memory structure and there do not appear to be timing or
synchronization problems at this stage. Now we'd like to do useful
work with these digital stimulus-response channels (eg. reponse
functions on the fly) and use it to compare DMA options. On another
front, the EPICS controller for DS340 signal generator is complete
however there are still some timing glitches in the RS232 interface.
Physics Environment Monitor (Alex Marin)
-------------------------------------------
We continue to work on the PEM/DAQ portable system to be used for the
1st SEI article test. There were two bugs found in the software, the
first one was fixed, while the second one is still under investigation
at National Instrumnet. Also a PCi-MIO-XE16-10 board broke down.
We
aranged to have a loaner for the 1st article test (an 16-4 model,
250Khz and 12 bits). The system will be shipped to Hanford next week.
Matt is working on a new design for the PEM interface plates.
Optical Contamination (Daqun Li)
--------------------------------
Viton O-rings have been loaded into cavity two (both main chamber
and its side chamber) and the cavity is pumping down;
Ringdown and mode spacing data are still taken on cavity one with
teflon wires. There is still no obvious change in the teflon
data.
Measured reflectivity of two REO coated beam splitter samples for
P polarization. The results are 52% +/- 1% for both samples.
-----------------------------------------
Control and Data System -- R. Bork
(WBS 1.2.2)
-------------------------------------------
Suspension
===========================
- LOS Controller boards due back 6/5.
- SOS Controller boards due back 6/19.
- SOS controller chassis are due 6/19.
- Satellite module boards are due back 6/8. Then they need to be
stuffed and tested.
ASC
==========================
- Demod board schematics are complete and board layout has been started.
- Photodiode board schematics are 75% complete.
IOO
==========================
- Mode Cleaner alignment servo board schematics are 75% complete.
1) EO Shutter Control: Sander is completing changes to controller
design. Layout should be completed in about a week.
2) Mode Cleaner Length Servo: Xing Fei has begun testing the prototype
demodulator and gain stage portion of the length servo
3) RF photodiodes: Joe Suina is completing the last of the current
batch of photodiodes. We plan to send them to MIT to get some
statistical measurements of the diodes before turning them over to
those individuals that requested photodiodes. We will then do a week
or
so of rigorous testing of one diode in our lab before making final
modifications to the layout and going into production.
Timing Systems:
================
1) The order for the GPS System has been placed with Brandywine. The
first and second level GPS clock fanout module circuit designs are
almost complete. PCB layout should begin next week.
Hanford
=========
- DAQ Controller and Reflective Memory Documents almost complete. RM
design changes (DCU blocks) have been incorporated.
- ICS agreed to replace 110B ADC. Waiting for board return to continue
testing of anti-aliasing daughter board.
- T1 installed to Hanford. Testing network quality of service.
- FMCS fully working over CDS LAN to mid and end stations.
| CR-980019 | WBS 1.2.1 | Development and Qualification of Core Optics Components (COC) Cleaning Procedures | J. Camp |
A continuation proposal for the FY 1997 Advanced R&D effort has
been provided to the NSF. The current
proposal end date was June 30, 1998. A revision of the Advanced R&D
Proposal for FY 1998-2001 has been prepared and is in the Caltech review
and approval cycle.
Electronic Submissions - A total of 290 new documents were submitted electronically. All were reviewed, added to the database and placed on-line.
General Documentation - An additional
748 documents were added to the database. The bulk of these remain
to be filed on the shelves. The following numbers reflect the breakdown
by category of these new documents:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
| Technical Notes/Informal (T) | 19 |
Photo Activity - One packet of photos from Hanford and two packets of photos from Livingston were processed. These packets represented 23 additional photos. A total of 66 view graphs were prepared for distribution.
Shipping/Receiving - A total of 75 packages were prepared and shipped out while 209 packages were received and distributed throughout the project.
| CR-970037 Rev A | WBS 1.4.3 | LIGO Data Analysis System | $ 5,579,000 |
| CR-980007 Rev A | WBS 1.1.5 | Beam Tube Bake out Adjustment (based on experience and estimates-to-complete. | $ 959,000 |
| CR-980011 Rev A | WBS 1.1.5 | Beam Tube Bake electrical power costs | $ 307,000 |
| CR-980012 | WBS 1.1.5 | Beam Tube Bake Site Support Items | $ 49,000 |
| CR-980015 | WBS 1.1.1 | Miscellaneous Vacuum Equipment Mods to reflect changes to PSI contract payment milestones | $ 55,335 |
| CR-980016 | WBS 1.1.4 | On-site telephones, Hanford | $ 60,000 |
| CR-980017 | WBS 1.2.2 | CDS Spares, Suspensions Test Stands, Travel | $ 265,580 |
| CR-980018 | WBS 1.1.3 | Asphalt Paving of Service Roads, Livingston | $ 95,351 |
Reviewed and input earned value updates received to-date. Received and analyzed schedule updates for the Detector and Vacuum Equipment. Reviewed the PSI monthly progress report for consistency with the LIGO schedule.
Began updating schedule information in Open Plan Pro for Detector. Received the Hytec schedule and reconciled this with the Detector schedule in Open Plan, updating finish and start dates, changing links, and confirming relevant milestone dates.
1.4.3 Systems Engineering
1.4.3.1 Systems Engineering & Integration (AL, BB, CC, JK, DC)
Vacuum Review Board meeting was held Thursday to review preliminary
RGA
scan data from the HAM SEI Support Beam vacuum qualification tests
at
Hanford. The data raised several issues requiring more measurements.
Briefly, an HC signature could be seen from the items; however a
conversion to outgassing rates is ambiguous without testing to
ascertain the amount of contribtuion to the outgassing coming from
test
chamber walls. A set of action items were recommended.
__Integration Planning: No report received
__Analyses: Nothing to report
__Reliability: No report received
__Integrated Layout/Drawings:
__Mock-ups:
ELEVATED PLATFORM FOR MOCK UPS
Preliminary tests on the HAM mock up along
with discussions with various
members of the LIGO team seem to indicate that a large platform with
a
small (footprint) base will be required which is unstable.
So one
possible solution would be the attachment of the platform to the 84"
access
door nozzle flange, which make the platform very stable. So the plan
is to
buy a generic near size platform & rework it to our requirements.
Hopefully
will be sending a sketch out by Tuesday or Wednesday of next week.
This
project is now assuming something of a phase #2 or even a phase #1
priority
level.
HAM 84" ACCESS & 14" ("E") NOZZLE GUARDS W/COVER
Drawings are with Rick Savage, and an order for weights
has been placed,
in Chatsworth. Central Engineering may do part of the weights. Rick
has
decided that the pricing is reasonable and so will order most of the
parts
in the Hanford area.
ASC LEVER LAYOUT
The lever beam paths have been layed out in BSC 8
to insure that the Ghost
Beam Dumps do not interfere. The path layouts in spools numbers BE-5
&
BE-6, and BSCs # 3 & #7 have been delayed till the status of the
Louvre
Baffles is determined. No date of completion is projected. However
if time
permits, will lay out the ASC levers in the spools, BSC envelopes,
&
adapters, just to get a jump on the location of apertures required
in the
Louvre Baffles. Since we have a temporary body who can do it, and we
may
get it done sometime next week, 6/10/98.
WASHINGTON OPTOMECHANICAL ILDs
The Mid & End Station xref's are still
on temporary hold waiting for
input from the various groups (IOO, ISC,COS).
PSL/IOO XREF LAYOUTS FOR ILDs
New plan & elevation layouts from Aaron @ UFL
for the PSL/IOO Optical
Tables & Hams 1&7 (4k & 2k), are incorporated into the
Optomechanical
drawings. Some fine tuning will be required by UFL before they are
finalized.
OPTOMECHANICAL ILD LAYOUTS
The vertex layouts are still waiting for final input
from ASC, PSL, & IOO
groups.
1.4.3.3 Modeling & Data Analysis (KB/HY/AL)
Hiro:
SUS/SEI
There was a meeting on June 3, Albert, Stan, Samm, Somuya, Biplab and
Hiro, about the modeling of SUS/SEI. Somuya reported his formulation
of
the dynamics. His basic formulation for the suspended objects, wires
and
mass, with the wire motion, transverse and longitudial, has been finished,
except for the explit choice of the model for the internal damping.
The formulation can be applied for complex structures, so long as there
is
no non-trivial nonlinear effects do not exist, which is most likely
the
case for LIGO. Somuya and Hiro will work to build a model in the End
to
End model environment to test and understand the formulation.
Stan
pointed out a pitfall of the numerical simulation when Q is very high.
Longer term plans include
(1) Somuya will apply the model to build a system with a cylindrical
mirror, suspended by two wires with longgitudial and transverse vibration
and damping.
(2) Albert will make a table of items to be included to simulate important
phenomena.
(3) Stan suggested a staging approach for the seismic motion input,
the
ground level and the table top.
(4) In the long term,
Mode support
Implementation is keep going. The transition from scalar to multi mode
will be done efficiently/safely using the C++ template.
Documentation
LIGO-T980051-00-E, "Getting Started with End to End Model" will be
available soon. This is a step-by-step guidance how to write a simple
module and how to run the program.
Validation / Debugging
A few summation cavity bugs were fixed, and other validations are going
on.
Blackburn:
KB met with Bruce Sears to discuss the role that abstract classes and
virtual member functions as well as templates would play in the filter
kernels of the LDAS software design. Bruce is eager to learn C++.
KB was given a pointer by Sam Finn to a C++ linear algebra package
called Blitz++ that delivers equal or sometimes better performance
to FORTRAN. The package uses ANSI standard C++ templates but few
compilers currently support implementation of templates. However,
if shown to work, this could greatly enhance performance of C++
standard code in the LDAS.
KB posted his updated version of the LSC ASIS working group webpages
for noise models. The webpage gives hyperlinks to noise curves, data
sets and C++ noise library source code and parameter files. For those
interested in the LSC ASIS group, look under the webpage for the group:
http://www.tapir.caltech.edu/~lsc_asis/
KB contacted ObjectSpace about the release of versions of their C++
socket class library with is supported under Solaris 2.6 and Linux.
The company expects to deliver these in late June. KB also contacted
Redhat LINUX sales to learn the expected shipping date for Redhat
Alpha Linux 5.1. The shipping date is June 15th though it may become
available a few days earlier. The Intel version is already shipping.
KB met with Albert Lazzarini to discuss LDAS software development
schedules. KB and AL also interviewed several candidate programmers
for the LDAS project. KB met with AL and Larry Wallace to discuss
the hardware/network needs for the new location in Millikan.
Lazzarini:
Worked with SDSC and PNNL to proceed with setting up the T1 link at
Hanford. Barker has done some preliminary testing of the link and it
appears sound. Next we need to get the subnet set up at Hanford,
including www server and mail service. Wallace will be traveling to
hanford in the near future.
COLLABORATIVE RESEARCH (LS Finn, Mohanty, Mukherjee, Romano)
S. Finn:
1. Wrote GWIC Mtg Report
2. Worked on detector network data analysis paper
3. Explored C++ class libraries for arrays
4. Met with E2E team to discuss current status and future plans of SEI/SUS
modeling effort.
5. Discussed with A. Lazzarini statistical tests for guassianity and
stationarity of time series noise; in particular, clustering statistics
for the
identification of excess noise.
6. Had extensive discussions over several days with J. Creighton on
statistical
analysis for rate calculations, digital filter design, quadrature amplitude
demodulation for efficient data analysis in a fixed pass-band, and
considerations in the evaluation of Wiener optimal filters for
discretely-sampled data.
7. Had extensive discussions with J. How and D. Debra on system identification
methods, Kalman filtering, and the general problem of tone-removal.
(The latter
problem is, it turns out, very well studied. This is fortunate for
us, as the
violin modes are very pure tones.)
8. Met generally with Stanford group to discuss gravitational-wave sources
relevant for LIGO
9. Met with Lars Bildsten to discuss issues related to QPO's as sources
of
gravitational waves.
S. Mohanty:
Over the past two weeks, I have been looking into the issue of damping
in connection with the SEI/SUS model. Damping in the suspension wires
is mainly due to internal dissipation and is quite different in form
from the usual viscous damping that one is used to. However, the equations
of motion are still linear and hence can still be handled using the
Green's function approach that I have been developing. As yet I have
not
come across any reference which discusses the method I have been investigating
but the search continues. The Green's function method is in some ways
similar to the Finite Element method but my study in this connection
is still
not conclusive. A direct application of FEM to the SEI/SUS would probably
be
too time intensive to be of use to the e2e. My main goal now is to
solve
for the transfer functions of a rigid cylinder suspended by two wires
clamped onto it, including the wires transverse (2 polarizations) and
longitudinal modes, internal damping in the wires and the mirror's
translational and rotational d.o.f's. I also had a discussion with
G. Cella
from Virgo regarding their modelling efforts.
I have also been working on the GRB paper with Joe and Sam. Our results
have been recently modified and some more calculations need to be done.
Attended the detector noise characterization meeting and presented
my work
on SEI/SUS modelling.
My trip to India was fruitful : I was granted
my Ph.D. degree.
S. Mukherjee:
For the past two weeks I have been looking into the various Kalman filtering
algorithms ( Extended Kalman Filter/ White and Colored noise ) for
tracking
and removal of the violin modes in the 40 meter data. As reported earlier,
the
extended Kalman filter model with the process noise and the measurement
as
Gaussian white noise sequences were unsatisfactory in producing the
characteristics of narrowband noise. The next logical step was to consider
colored noise models. Initially I started by assuming that the process
noise
was colored while the measurement noise was white. I used the algorithm
for
colored noise but with the incorporation of the non-linear model that
describes
the violin modes. Taylor expansion was used as the linearization procedure.
This gave correct tracking of the amplitude and the phase for a very
limited
range of the noise matrices. Moreoever, the phase showed sudden jumps
and hence
this model wasn't a good one for subtracting the signal. I pursued
this model
further by inroducing filters so as to make the measurement noise colored
too.
But that did not improve the results. While searching for the possible
drawback
in the model, I learnt that basic Kalman filter theory assumes Gaussian
state
estimation error distributions. But in case of non-linear models, even
if the
process and measurement noise were Gaussian, the resulting errors in
x^ would
be non-Gaussian owing to the non-linearities (F.E. Daum & R.J.
Fitzgerald,
IEEE Trans Autimat Contr, AC28, 269-283,1983). One way to take care
of these
problems is to use alternative linearization methods. I am looking
into
the possibilities of applying modified stochastic linearization procedure
(L.D. Hostetler & R.D. Andreas, IEEE Trans Automat Contr, AC28,
315-323,1983)
instead of the Taylor expansion that I had been using so long.
Another way to look at this problem would be to go back to Kalman's
original
idea that a random function of time may be thought of as the output
of a
dynamic system excited by an independent Gaussian random process (R.E.
Kalman,
Trans ASME, J Basic Eng, Series 82D, 35-45 1960). In this case, the
violin
modes could be described as viscously damped harmonic oscillator excited
by
white noise. The only computational snag arises with the requiement
that the
process noise variance has to be positive definite. I bypassed this
problem
by rewriting the noise matrix coefficient with a fictitious variance
term.
The model works very well with known signals (simulated data). I am
in the
process of applying the same to the violin modes in the 40 meter data.
The
model involves some simplifying assumptions like viscous damping etc.
However,
viscous and structural damping (real case) will be the same towards
the
resonant frequency and I believe that this will not cause much problem.
I attended the meeting on Detector Characterization (TUESDAY MAY 26,
1998)
and had a discussion on noise characterisation with Warren Johnson
the
following day.
J. Romano:
1. Finished writing MATLAB functions to calculate (via Monte Carlo
simulations) false alarm and false dismissal rates as functions of
threshold for the cross-correlation and maximum-likelihood statistics
for stochastic gravity-wave searches. Found that, for the special
case of coincident & coaligned detectors, with no cross-correlated
noise, and white power spectra, the maximum-likelihood statistic
performs better than the cross-correlation statistic. More precisely,
the maximum-likelihood statistic has a smaller false dismissal rate
(for fixed false alarm rate) than the cross-correlation statistic,
for all values of the signal amplitude. This result was as expected.
The next step is to compare the two statistics for a slightly more
complicated model problem---namely, two physically separated (but
still coaligned) detectors, with no cross-correlated noise, and white
power spectra. We expect that the maximum-likelihood statistic
will
perform better than the cross-correlation statistic for this model
problem as well. After this test is completed, we plan to write
a
paper describing our results.
2. Discovered an error in an earlier calculation that I did to
determine the optimal filter function for the cross-correlation of
two detector outputs, triggered by a gamma ray burst (GRB) event.
A
correct derivation of the optimal filter function yields an expected
signal-to-noise ratio that is a factor of sqrt(2TB) smaller than what
we had originally thought. (Note: T~10 seconds is the duration
of a
typical gravity-wave signal that we hope to detect, and B~200 Hz is
the detector bandwidth.) This reduction in expected signal-to-noise
ratio means that we won't be able to "indirectly" detect gravitational
waves from, say binary inspirals, before a direct detection in a
single detector (using matched filtering) is possible. But we
can
still use a t-test based on the cross-correlation statistic to put
an
upper bound on the amplitude of gravitational waves associated with
a
GRB. This upper bound cannot be obtained by simply using matched
filtering in a single detector.
1.4.4.2 General Computing (LW/TE)
Wallace:
MIT:
1. Tom E. was able to debug the modem setups on the SUN boxes. Basically
the
flow control needs to be on on the SUN box and off on the modem. It
doesn't
follow the documentation for the setup but it works and appears to
illiminate
some of the modem data transfer problems.
2. Received an additional 9 Gb disk for user files.
3. Continuing to prepare for the move to the new building.
Livingston:
Nothing to report
Hanford:
1. Finally, have a testing T1 connection in-place. Dave and Christine
have the
cisco router on-line and have been able to do some network testing
from there to
Caltech on the T1 connection. There are some IP address issues and
the final
signing of the MOU that still need to be done before a true connection
can be
made.
2. Still working on getting the Ultra 60 replaced. SUN has been dragging
their
feet on this one. We will see what gets resolved today before we escelate
it.
3. Continued tracking of previous procurements of hardware and software.
CIT:
1. Multiple accounts have been added. Mostly SURF students.
2. Finally, received the Ultra 30 to be used for testing in the 40M.
Stuart A.
has the box and is installing the S/W and getting it ready for the
connection to
the network.
3. We have spent a good deal of time in the 40M trying to track down
some
computer issues that may be causing some of the performance problems
that have
occurred in the past week.
Jay H. has gone through and rechecked all of the network cables as
well as reset
the machines.
We found that after the servers have been up for a period of time (over
a month)
without being rebooted that they cause some degridation in performance
of the
cdssol machines.
Also, enabling the ATM card in cdssol5 before the other network cards
caused the
system to not function correctly. We have disabled the ATM card since
that test
will now be performed on another computer. (Just as a note one of the
monitors
on cdssol5 needs to be replaced.)
4. After discussing the move to the second floor with Gary S. it has
been
decided to wait on the computer move plans until some other issues
that Gary has
to deal with have been resolved.
5. Still working on the move to Milliken and Albert L. is writing an
MOU for
the networking setup since it appears we may be going through the CITNET
people
for that connectivity.
6. After testing the tapes from the last full backup I found enough
problems
from trying to read the tapes to warrant doing the backup over again
for sirius.
The systems backups went well. We still have kater to do a full backup
on.
7. Purchased and installed a printer for the auditors.
8. Fixed multiple PC's as well as upgraded the memory on a few more
of them. It
appears that the ACAD drawings now require a PC to have 128MB of ram
in-order to
run efficiently.
9. Some minor fixes on plotters and printers.
10. Barbara ompleted 2 more iterations of the Monolayer Per Year calculation
on
the outgassing report. Working now on the Absorption column.
11. Barbara helped Dot set up her
spreadsheets on her new computer. For some
reason, all the spacings were different when the worksheet was opened.
12. For the web site: (Barbara K.)
Moved the internal document index and additional
documents to the public
web site. Reformatted some pages. Prepared the News page
for the next
newsletter. Set up a couple of sample pages of the Travel/Vacation
Itinerary for Irene to look at. Looked at reformatting/rearranging
the
internal page.
Barker:
The current plan is to keep the T1 line disconnected from LHO GC for
now. We will fully test the T1 to see what reliability, latency
and
bandwidth quality of service it can provide. CP and DB will meet with
LW when Larry visits
LHO to install security into the system before the T1 is allowed to
connect to the GC ATM. PNL may support us in programming the Cisco
router.
When the T1 is fully tested and is secure, and if the permanent numbers
are still some time off, then we will make the decision to integrate
the T1 subnet into the GC system. Several machines will be moved onto
the new network as test stands. When the system is fully checked out,
more users will be moved onto the new net if they require higher
bandwidth internet access. The design of a system with two internal
ELAN subnets (with an internal gateway) and with the email server on
the other side of a physical router is to be determined.
Sanders:
During the past week I installed my Linux machine on the LIGO network
and
tested several services.
1. I installed the hard drive previously used to build a Red Hat 5.0
system
on a Toshiba 740CDT in a second unit and connected that to the .125
subnet
in LIGO. It is now hostname zibet (131.215.125.50). It has been running
since last Thursday though I rebooted twice in the course of installing
new
features. It is quite stable. It has accounts for root, me and Larry
Wallace but does not use our NIS+ services yet.
2. This version of Linux does not clean out entries in the table of
logins
when logouts occur from remote machines. Everything works okay from
local
logins. So "who" or "users" reports all logins since the last reboot
for
remote logins. A bug in Linux?
3. I installed NFS mount points for my LIGO home directory to the zibet
local filesystem. That works fine though the graphical fstool does
not
report the mount until you log back in.
4. Print services are more complex. Linux uses the BSD printcap services
(lpr) and our Solaris system uses the lp method. In
installing a LIGO remote printer you have to have root (on LIGO) install
a
specific spool directory for that printer. Larry figured that out after
we
saw local queue requests appear but nothing printing. Anyway, printing
to
remote LIGO printers now works well.
Two very important features will need to work before we can adopt Linux.
We
need to use the Solaris NIS+ service to authenticate users and enable
central administration. Linux currently supports NIS (older and simpler
method) and we have dropped that in LIGO machines. Larry has to find
a way
to replicate NIS from the NIS+ databases and maintain synchronization,
or
we have to get NIS+ client services to work under Linux. These client
services are about on the net in beta form. The author, Thorston Kukuk,
has
just released a new HowTo documenting how this can be used. So this
will be
attempted.
The second requirement is to make filesystem automounting work. In LIGO,
we
do not mount all filesystems statically to our many workstations. The
network load and latency would be terrible. On the LIGO network,
filesystems are mounted dynamically when requests are made, and unmounted
after inactive periods. This has been made to work on Linux systems.
The
best method appears to be use of the BSD daemon called amd. I have
begun to
research this. But it depends upon NIS or NIS+ to work. It may work
with
an alternate package, autofs.
A hand-me-down Pentium tower machine has been freed for use in these
tests.
This machine, with conventional innards (not a laptop) will support
X and
CDE. I will shortly install the new Red Hat 5.1 release, TriTeal CDE
and
Applixware on that machine for more realistic tests.
(GHS note: For the programmers among you try this link:
http://www.ligo.caltech.edu/~sanders/cr_dilbert.GIF
Date: Thu, 04 Jun 1998 16:41:57 -0700
From: Elizabeth Wood <ewood@ligo.caltech.edu>
Elizabeth K. Wood
Made arrangements to have rooms 254 and 21 rekeyed to LIGO master
key. This
was accomplished Thursday.
Prepared and delivered to HR personnel requisitions for three employees
Began making preliminary arrangements for the Hanford safety meeting.
Made
travel arrangements for the trip.
Continued working with the PMA offices in changing the account distributions
for LIGO personnel.
Covered for Irene, including travel and a crash course in doing payroll.
Made spreadsheet in preparation for the annual salary review.
Talked to Michael Butler about ordering speakerphones for the 6th floor
of
Millikan as per Albert;s request.
Rita Torres
More preparation of IFB EJ-297 for Hanford Water
System Integration. Obtained bound copies from Repro
to then FedEx to bidders.
For I. Petrac/P. Lindquist did letter to NSF for approval of
Pegasus change order No. 2. Also did change order No. 3
to Senior Flexonics, and change order No. 1 to Univ. of Michigan.
Re-formatted Procurement Justification for Superior Jig, then
edits to the PO and text; also letter to accompany to NSF.
For P. Lindquist did updates to continuation for Advanced
R&D Proposal. Distributed CCB minutes, meeting of 5/19/98,
also distributed end of March monthly progress report.
Irene Baldon
Out of town
Dorothy Lloyd
No report
=========================================================
LIGO Hanford Observatory (LHO) Operations (F. Raab)
=========================================================
General Items:
--------------
We have begun a formal process of requiring work permits. The work
permit system provides for the coordination of tasks which have the
potential for interference - e.g., drilling a hole in a clean lab or
performing any task that might affect the physical environment for
interferometers or other measurement equipment. There is now a daily
meeting from 7:50-8:00 am (weekdays) at which open permits are
announced and new permits may be requested. Currently the meetings
are
run by Otto Matherny in the main conference room. Eventually they will
be
run by the lead operator every morning in the control room.
Bake Oven:
----------
(K. Ryan)
The repaired baseplate should be on site by 6/8. Load testing
of the
bell jar hoist was delayed this week as the "Ottis" mechanism took
longer (three days) to fabricate than expected. I will witness
this test
at the fab shop on 6/5. Leak testing of the metal valves, pumps
and RGA
are complete. Betsy and I are are putting together the control
panel
while we wait for the hoist and base-plate stand to be delivered.
I expect that the hoist, baseplate stand and control panel to be installed
by Friday 6/12.
HAM 1st-Article Test:
---------------------
(C. Gray, H. Radkins)
The second rail system, necessary for installing Support Tubes when
two
HAM chambers are adjacent, has arrived at Hanford. This system
mounts
on the crossbeams which are in place around the mock-up and the test
chamber. Support tubes are staged to go into the mock-up where we will
evaluate the utility of the rail system. We are waiting for one
last
item to protect the support tube during this process.
The rail systems have many movable parts that want lubrication, they
are
quite bulky and will require clean storage as part of the system must
pass through the chamber. They will offer, we believe, usefullness
in
bolting up and positioning of the support table. However, because
they
are mounted to the crossbeams, it will require a work-around to lower
the
crossbeam to the critically positioned support tubes. We have
developed
an alternate procedure should the rail system prove too troublesome
for
its benefits. This will require only some small parts to be in the
chamber
which should be easy to clean.
At current, relative to our 4-30 SEI HAM 1st Art Test Schedule, we are
complete through item 44. Item #38, Adapter Plate & Actuator
Ersatz in
Position, will be done once the support table, support tubes, and the
crossbeams are a unit. This may have us a few days ahead of schedule
but
we won't let up now.
Optics & Lasers:
----------------
(D. Cook)
Priority items have been getting out the Standard Operating Procedures
for
the LIGO 10 Watt,1064nm Laser; the 700mW 1064nm NPRO; the 1 Watt,980
nm
Laser (Daniel's). These Documents are sub-parts to the LHO Laser Safety
Plan. These Lasers are in place in the Optics Lab and require these
before
they are operated. A draft of the SOP for the 10W Laser has been completed.
We will be testing the 10W Laser's chiller for it's ability to operate
at
longer distances than it is normally used (100'). We have been monitoring
the
Quality of the air in the Vacuum Prep. and Optics Labs. They appear
to be
better than a Class 100 with no activities going on. The quality drops
to
an average Class 4000 with two to three persons moving about doing
medium
tasks, typically dressed in street clothes with the exception of shoe
covers. Helena Armandula and Steve Bell spent time at LHO with me,
getting
familiar with our facility and discussing the equipment requirements,
and
clean room protocol they would like to see installed. Lab supplies
continue
to arrive
Computing Systems:
------------------
(C. Patton)
The Caltech picture ID cards have arrived back from the Card Office.
Thank you to Pat Burrescia in the Card Office.
The Mathematica license transfer, Service Contract, and software upgrade
have been ordered and should be here in two weeks. Mathematica
is
currently running on Unix, but has a problem with the font server when
trying to run it through Exceed on a PC. This appears to be a
fixable
problem, meanwhile Janet Casperson (REU student) is using the E3000
server to do her work. The Solaris Sys. Admin. training course
arrived
this week and training has started. General Computing software
license
inventory is continuing. Larry Wallace will be in Hanford in
the near
future to discuss software licensing and to help upgrade the OS software
on the E3000 server. The T1 line is now connected through PNL
to
Caltech. D. Barker and I are working on a continuous test for
reliability and bandwidth. The LHO General Computing Network
Conceptual
Design document is in the process of being re-worked and updated, should
have a first draft by the end of this month.
Beam-Tube Bake Out:
-------------------
(M. Lubinski, M. Guenther, K. Stiff and W. Althouse)
Electrical Support Services Contract (input from Sun River):
Accomplishments:
Work was initiated on two(2) of the Connexes. The D/C Power Supplies
were
placed along with the 1200 Amp breaker Panel. Two trailers (40')
were
purchased and delivered to the Sun River Electric shop. The 45KV
Transformers were assembled and placed at the idenified location on
the Y-2
beam tube. 14EA 4 inch holes were drilled by the Sun River subcontractor
(A-Core) for 13.8 Power installation to the 45KV transformers.
Problems/Concerns:
All work proceeding as planned. 45KV transformer installation
is pending
resolve of L&I acceptance of the A-1, A-3, and B-2 panels.
Open
discussions are held daily with LIGO staff to prevent or solve concerns
that may arise.
(ML note: The A1, A3 and B2 panels will be inspected 6/8/98 to
determine
UL rating. PUD should begin installation of 13.8 KV power to
the
transformers at the same time.)
Cryopumps:
Installation of these pumps has been delayed because assembly onto the
pump stands has taken longer than planned. Pump installation should
proceed this week and the delay will not impact the bakeout schedule.
Data Acquisition and Temperature Control System:
Software development continues with alarm, data logging and power supply
control.
Summer REU Projects
-------------------
(compiled by R. Savage)
B. Weaver and J. Casperson have moved into an apartment in Richland
and
have begun working full time. T. Islam and M. Zwikel will begin
work at
Hanford on June 15th.
RGA ANALYSIS (Betsy Weaver)
During the second week of my internship at LIGO Hanford, Wa, I assisted
Kyle Ryan with the following tasks in preparation of the bake oven
construction:
- Leak tested valves to be used in bake oven.
- Fired up RGA and observed sample spectra.
- Tested roughing and turbo pumps.
Presently, I am assisting in procuring materials for bake oven and
clean
room use. I am also continuing to read O'Hanlon's User's Guide
to Vacuum
Technology to further understand the procedures and processes that
(will)
take place in the vacuum systems here at LIGO.
PSL CHARACTERIZATION (Janet Casperson)
During this first week of my internship at the LIGO Hanford Observatory
I
have been learning about methods of mode matching. I began by
reading and
trying to comprehend the first several chapters of Verdeyen's Laser
Electronics and Kogelnik and Li's paper on Laser Beams and Resonators.
As
a result I now have a good understanding of how mode matching between
optical cavities with a thin lens works, and I am now looking at mode
matching with a two-lens system.
For additional information about this report, contact sanders@ligo.caltech.edu
