The Project Control Meeting
Agenda for Monday July 27, 1998 will be:
(Meeting time: 10:30 am Pacific Time)
WBS 1.1.1 Vacuum Equipment(Worden)
1. Gate Valves:
Three Hanford valves have passed their final in-situ
leak test
and will be the subjects of discussion at a formal
acceptance
meeting scheduled for 7/30. WGV12 was tested on
Thurs 7/16,
while WGV11 and WGV17 were tested over the weekend.
a. WGV11 (Y-end) Passed in-situ leak test.
b. WGV12 (Y-mid BT) Passed in-situ leak test.
c. WGV17 (Y-end BT) Passed in-situ leak test.
d. WGV14 (X-mid) Complete except for in-situ leak
test.
e. WGV19 (X-end BT) Waiting for a new lead screw.
f. WGV20 (X-end) Waiting for new gate.
g. WGV16 (X-mid BT) Found out of spec gate grooves-waiting
for new gate.
h. WGV15 (X-mid) Bellows leak testing underway(new
bellows installed).
i. WGV18 (X-mid) New bellows installed, ready for
cycle testing.
2. Installation activities:(Kyle Ryan)
X-arm end station:
At LIGO's request, PSI will repair the ball
screw bearing housing on X-2's 44" BT gate valve
(Apollo has fabricated a fixture which will be
used to repair these bearing housings. Several
of these need repair and it should be faster/better
to do this work here as opposed to sending the housings
to GNB). The bake blankets are installed on
the VE but
baking won't take place until the 44" gate valve
is repaired and the air leak probs are fixed in
the
vertex + right BT manifold at the Corner Station.
X-arm mid station:
The leaking conflat flange on X-2's VE gate valve
ball screw bellows has been fixed. PSI/GNB switched
the ball screw bearing housings between X-2's VE
and
BT gate valves such that there is now one good valve.
The other is waiting for a replacement gate while
the
bearing housing will be repaired on site.
Corner Station:
All of the bake blankets have been boxed up but remain
in the LVEA. PSI found a leak in the annulus
of one of
the HAM-mode cleaner flanges and repaired it.
The RGA
data still indicates a 10-7 torr*L/sec air leak
for the
Rt BT manifold + vertex combination. PSI then
found a
leaky conflat on the 84" door of one of the HAMs
that make
up this volume but found that the air signature
doesn't go
away when the known leak is bagged and purged with
He!
The hunt continues...
Y-arm mid station:
Y-2's 44" BT gate valve has been fully repaired and
leak
tested. The clean room has been positioned
over the cor-
responding VE gate valve with inspection to follow.
Y-arm end station:
PSI/GNB valve inspection/repair is complete.
WBS 1.1.2 Beam Tube (Jones)
a. Livingston Installation
CBI is attempting to have the data acquisition system
fixed in
time to perform an acceptance test accumulation
simultaneously
on modules X1 and X2 the evening of 7/23.
Weiss's analysis of the trial accumulation of 7/14
(a preview,
performed without temperature/pressure monitoring)
indicates
an air signature of approximately 1.6E-6 tl/s, compared
with
the prior acceptance threshhold of 7E-7 tl/s. This
has not
been corrected for temperature and is only preliminary,
as
there are questions regarding the calibration which
have not
yet been discussed.
Discrepancies in post processing results have caused
CBI to
reshoot 4 of the X arm control supports with GPS.
Approximately
half of the X arm shots have now been post processed
with
precise ephemeris. All but 6 of the 32 Y arm control
supports
have now been shot. All support readjustments have
been
completed, and the painting/scribing of initial
positions
have been completed. The transparent PVC caps have
not yet
arrived.
> 1.1.3 & 1.1.4 BTE and Civil Construction (Fred Asiri)
>
> >>Issues:
> Hanford:
> 1. Water System Integration:
Subcontract justification for
the Hanford Water System
Integration has been prepared
and was presented to NSF for approval.
In general term this work, will
integrate the watersystem
components (Well Pump, Domestic
Water Tankage, Fire Water Tank,
Irrigation and Water Treatment)
to a fully automated standalone
system.
2. New Staging and Storage Building. Design and specification
are
being revised by the Architect to bring
the estimated cost within
the budget.
3. The asbuilt drawings for the Hanford site has been
completed . We
are in process of asigning the proper
LIGO number to them. As soon
that is complete we will distribute
the copies to the site and
DCCN.
> Livingston:
> 1. Worked on documentation for the final close-out of
the Hensel
Phelps contract. The final settlement
amount has been submitted to
CCB for approval.
2. The asbuilt drawing is being prepared by Parsons.
The marked-up
drawings have been received from
the subcontractors.
Hanford Construction (Otto Matherny)
Levernier
Levernier submitted a plan of action
where the 17 outstanding
items will all be completed by the end
of July 98. Fifteen of
the 17 are already complete.
The largest of the outstanding items
is the completion of
the opposite season testing of the HVAC
system.
OTHER ITEMS
The rodent problem is continuing in the
Beam Tube Enclosures.
It is difficult to keep the critters
out since we are penetrating
the walls and occasionally must open
the doors. The good news is
that they are not eating the insulation
on the wires so far,
the problem is that personnel may be
exposed to the hantavirus.
The new building is under redesign to
fit the budget.
The water system modification contract
will be awarded within the
next few days.
The proposals for the mechanical maintenance
contract are under
evaluation.
-
Livingston Construction (Gerry Stapfer)
Some of the recent thundershower activity has shown that most of the
buiding leaks have
been fixed. We still need a real downpour to verfy the overall intgerty.
All of the cooling
coils other tha those used in for the OSB lab area have now been re-installed
and are
perfoeming properly. Berhard Mechanical is scheduling to re-work these
coils starting this
friday. As this means that the airconditioning system for the lab area
will be shut down,
they are scheduling to work over the weekend. all equipment located
in the affected areas
will be shut down as the temperatue is expected to rise to 100 degrees
plus.
Demco is installing the temporary substation along hyw 63. The transformer
and poles are
in place and Demco expects to have the service operational by the end
of next week.
Date: Thu, 23 Jul 1998 20:50:30 -0400
From: David Shoemaker <dhs@ligo.mit.edu>
----------------------------------------------------
DETECTOR GROUP -- Whitcomb/Shoemaker
(WBS 1.2, 1.3)
----------------------------------------------------
-----------------------------------------------
Implementation Group -- Mark Coles/Fred Raab
-----------------------------------------------
40m (Jennifer Logan)
--------------------
This past week we have been studying the older style suspensions in
the
lab in preparation for wavefront sensing. Sadly
there appears to be
little in the way of reliable documentation (GHS
note: We will do a better job in LIGO of documenting our installed hardware
so this does not repeat) for these suspensions and
so we're having to take a lot of time-consuming low frequency transfer
functions to better characterise them. We have also been taking
advantage of Seiji's presence to better understand the design
decisions. One thing that has come out of all of this is the
problem
of cross-coupling of sideways motion to yaw. For these older
suspensions sideways motion is not damped at all and when the
transmitted light from the arms is analysed there is a clear peak at
the sideways frequency and indeed, when the whole interferometer is
in
lock it may be this frequency that dominates the variation in light
levels that we observe; we intend to verify this later this week.
----------------------------------------------
Interferometer Sensing and Control -- M Zucker
(WBS 1.2.1.1.6, 1.2.1.1.7)
----------------------------------------------
Date: Fri, 24 Jul 1998 10:20:15 -0400
From: mike@tristan.mit.edu (Mike Zucker)
Interferometer sense/control (Zucker)
-------------------------------------
ASC initial alignment:
----------------------
-Received a few thousand optical lever machined parts from Carlin
Machine.
-Ken Mason is at Kenweld Co. 7/24 inspecting the first article MMT3
optical lever support weldment prior to shipment
-The PLX 2-arcsecond lateral transfer retroreflector came in,
undergoing inspection
-Yehuda discovered a serious contamination (and possibly structural)
problem with some of our viewports, from Insulator Seal. We may
have
to reject them and are working out a strategy to cover our early
Hanford deliveries (ISI did only a small fraction of the total
viewports, most are from MDC and look OK).
-Zucker and Fritschel made a start configuring the optical lever and
WFS table assembly areas in the new MIT lab (McInnes will take over
when he returns from travel next week).
ASC wavefront sensing:
----------------------
Held final design review on 7/23. The committee made many useful
and
supportive comments. Some detailed interface issues with IO came up;
these were hammered out and resolved early this morning between Zhu,
Reitze, Fritschel and Zucker on the phone.
LSC design:
-----------
Completing final design document for distribution 7/24. FDR is
scheduled for 7/29.
-------------------------------------------
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
--------------------------------------------
- The computer network modifications have cut off the network to the
PSL Lab. The PSL could not be controlled without the network
link, since
EPICS is installed on a computer over in Wilson House.
- R. Abbott has been ordering various PSL electronics components for
the
production PSLs. A list of components of things to be delivered
to the
sites has been generated and the pricing and availability of said
components has been checked.
- Drawings of a new vacuum chamber for the PSL reference cavity have
been
drawn. In addition drawings have been made for the vibration
isolation
stacks.
Input/Output Optics -- Dave Reitze, UF
-----------------------------------------
Hanford Site Visits
The IOO group is gearing up to descend upon Hanford for the installation
of the IOO components. Qi-Ze Shu, David Tanner, and Sasha Gorlenko
will
leave for Hanford in the first week of August for installation of the
PSL
table IOO components and suspension and testing of the mode cleaner
and
small telescope optics. The second wave will consist of Sany
Yoshida and
Dave Reitze in September to continue with SOS work and beginning placement
of the in-HAM components.
Procurement
The procurement for IOO components continues on schedule. The
following
components have been received/machined:
o PSL Table:
Mechanical Mounts including posts, mirror mounts, etc. (New Focus,
Newport, Thor Labs, UF)
Lenses (CVI)
Beam Blocks (ThorLabs)
Piezoelectric Tip-Tilt Mounts and Drivers (Physik Instrumente)
Periscope (UF)
Mirrors (REO)
o in-HAM:
Small optics suspensions (UF) - baked and ready for Hanford
Non-suspended 2" optics mounts (UF) - sent to Caltech for baking
Faraday rotator (Electro-optics Technology) - sent to Caltech for baking
" "
mounts (UF) - ready to be sent to Caltech for baking
2" HR mirrors for diagnostic beams (REO) - received, but the back sides
were not beveled. We are sending back to REO
for correction
o Other:
Optical Tables for Input Optics MC LSC/ASC (Newport) - received (by
MIT),
but table leg heights were wrong, so we're getting them
replaced;
will be received before needed.
Mode-matching measurement diodes (Advanced Photonix)
Mode-matching measurement electronics (MIT,UF)
Lenses (CVI)
Mechanical Mounts (New Focus)
Ordered, but not yet received/machined:
o PSL table -
LiNbO_3 electro-optic modulators (New Focus) - expected early August;
one of the non-resonant frequencies (61.2 MHz) is
near a PZ
resonance in the LiNbO_3; Charlie Hultgren is selecting
a x-tal
that is minimally affected.
We will test it for AM when we get
it.
Translation, Rotation Stages (Newport) - expected now
Optical Spectrum Analyzers (Coherent) - expected now
RF Photodiode (EGG) - expected early August
RF tuned circuit (UF) - expected mid August
Beam tubes (UF) - being machined
o in-HAM -
Small suspended optics (Corning, General Optics, REO)
Flat Steering Mirrors - received by REO, ready for
coating; should
be done early August
2 km Mode Cleaner Mirrors - will ship from GO to
REO this Friday;
should be coated by early August
2 km Telescope Mirrors - will ship to REO Friday;
will be coated
early August
Large Telescope Mirrors (Corning, GO, REO) - the first substrate is
polished and ready for shipment to REO; we will
not coat the big
optics until the second one is ready (late August).
Since these
won't be needed until November; this presents no
problem in
schedule
Polarizers for Faraday isolator (Karl Lambrecht) - ordered, ready by
late
August
Waveplate for Faraday isolator (CVI) - ordered, ready by late
August
Rotation Stages for Waveplates, Pol. (CVI) - negotiating with CVI on
delivery time for a lubricant free design.
Mounts for Waveplate, Pol (UF) - designed, will be ready by early
September
o Not yet ordered:
Viewport adaptor, beam tube enclosure from PSL into HAM - getting info
from Ken Mason
Mode Matching Measurement
Qi-Ze and Rana have been able to measure a TEM 20 (bullseye) signal
in the
experiment at a 0.1 Hz dither. However, we believe it is due
to the
higher order contributions to misalignment into the cavity rather than
a
true cavity waist position and size mismatch. Also, the TEM 01
component signal is ~ 10X the TEM 20 signal (another indication of
cavity
misalignment). In the actual LIGO implementation, the ASC gain
at 0.1 Hz
should minimize the 01 contribution. Nevertheless, we are working
on
better alignment to improve the measurement.
Also, we used electro-strictive actuators in the dithering of the
mode-matching lens. The actuators had a large amount of hystersis
and
couls only drive the lens 85 microns. We have built a solenoid driver
to
sinusoidally dither the lens over ~ a few mm, which should also improve
the signal.
High Power Testing -
Measured isolation of the 12 mm clear aperture Faraday rotator
(manufacturer: Electro-optics Technology). The single pass isolation
(defined by power in undesired polarization to desired polarization)
is
better than 40 dB. This value is better than the 8 mm clear aperture
version! (?)
Measured thermal lensing in the 12 mm Faraday Rotator. The dependence
of
the optical path change on the YAG power was observed to be close to
the
bare TGG crystal case. The optical path change at 10 W YAG input is
about
18 nm. (In the case of the 8 mm aperture, the dependence is higher
than
the bare TGG case). The Faraday rotator has been sent to Caltech for
baking.
We have received a viewport from Mike Z. and are testing the wavefront
distortions using the Shack-Hartmann
Core Optics Procurement and Metrology -- GariLynn Billingsley
-------------------------------------------------------------
The IR interferometer was conditionally accepted at Veeco July 17th.
It
has been installed at Caltech and awaits final acceptance testing which
is
scheduled for July 29-31. Preliminary results show an environment
which is
more active than the environment found at Veeco, the possible cause
is the
chiller/AC down the hall from the lab. Investigations are underway.
CSIRO now has measurements underway on two of the 4ITM's. The
radius on
2ITM04 after re-polishing is still a little short, they will do another
polish this week.
CSIRO plans on shipping the characterized, coated transmission flats
for
use with the IR interferometer on July 30.
Core Optics Coatings -- Helena Armandula
--------------------------------------------------
REO Contract - COC's coatings: 4 beamsplitters have been coated and
seem to
be within LIGO specs. Next coating run will be 2ITM's.
UFL: Returned 2" mirrors to REO for rework, they did not have bevels
on one
side, consequently they had numerous small chips. REO will rework them.
Also
source inspected several 3" optics that were sent to REO for coating.
Cleaning procedures: The cleaning procedure for the Small Optics has
been
finalized. It has been reviewed and approved by D. Shoemaker. We are
in the
process of testing the holding fixture to clean COC's to finalize the
cleaning procedure for those optics.
Core Optics Support -- Michael Smith
------------------------------------
ETM TELESCOPE:
M. Smith and J. Kern held a meeting with Optica One as a possible vendor
to
complete the detail design, to fabricate a prototype, and manufacture
the
production ETM telescopes. They will provide a budgetary quotation
next week.
ISC TELESCOPE:
ASC has agreed to take reponsibility for the ISC telescope. COS will
send
them the lens specification and focussing parameters.
PO TELESCOPE
The prototype of the secondary mirror mount is completed and has been
assembled by K. Mailand. It appears to function as designed. It will
be
tested for long term stability on the mirror test set-up.
BEAM-DUMPS:
A. Bagdalian has given a complete set of drawings to the shop for
fabrication.
ITM BAFFLE:
D. Rose defined the end points of the 2K ITM ghost beams, which will
be
caught on the ITM baffle located in WBE-5. A. Rosa and M. Smith are
working
on the design of the ITM baffle. Using the 3D model of the IFO in that
region, it is straightforward to locate the position of the main beams,
the
ITM ghost beams, and the ISC optical lever beams which must pass through
the baffle.
TEST EQUIPMENT:
IR AUTOCOLLIMATOR
J. Kern and M. Smith have been evaluating the sample IR CCD camera.
It is
considerably more sensitive than a TV frame rate video CCD, because
of
cryogenic cooling, with provision for integrating and providing photometric
data output. Also, they have ordered IR LED's for evaluation as a possible
illumination source for the IR autocollimator, instead of an IR laser.
The
work will continue when J. Kern gets back from Livingston.
STEERING MIRROR MOUNT TEST:
J. Kern and M. Smith are still testing short-term repeatability and
long-term
stability of various commercial mirror mount candidates for the PO
steering
mirrors.
--------------------------
Isolation Group -- M. Fine
--------------------------
Seismic Design (Mike Fine)
--------------------------------------------------------------------
1. Fine Actuator:
Two sets have been assembled completely and tested for static motion
with the PZT drives. Everything seems to be operating as expected.
The other two sets were partly assembled (without drives) and installed
on two piers of the prototype BSC. Hytec is planning static coordination
tests (two assemblies driving a single structure) and dynamic and noise
tests of the assemblies in the near future.
2. Rack Assembly:
Rack wiring is approximately 95% complete. Hytec still needs
to integrate
the pneumatics into the rack and installs pressure indicators in a
rack
front panel. These indicators will provide the operator with additional
health and status feedback. POs for the remainder of the multiplexing
hardware are placed; installation of these components will begin as
soon
as they arrive. Hytec is preparing to run a test to check out the rack
and software sometime next week.
3. Air Bearing Assembly:
Two of the four air bearings have been positioned on the coarse u-v
actuation assembly and assembled on the piers. The bearings have
been
tested for fit and appear to be functioning as expected. Hytec
is
experiencing a higher than expected flow rate in the bearings and is
investigating the cause.
4. Scissors Table Testing:
The assembly of the full BSC hardware has slowed the testing progress,
however the testing is continuing. Hytec is expecting to get
a comparison
of the Aluminum and Stainless scissors table completed next week.
Suspension -- (Janeen Hazel/Mark Barton/Mike Fine)
-------------------------------------------------------------------
No significant progress to report.
---------------------------------------------------------
Detector Systems Engineering -- D. Shoemaker/D Coyne
(WBS 1.2.1.1.9)
---------------------------------------------------------
Global Diagnostics System
(Rolf Bork, David Shoemaker, Daniel Sigg)
--------------------------------------------------------------------
Serap T. was visiting Hanford to discuss the diagnostics performance
monitors (search tool). She will start working to get this part
of the diagnostics system off the ground. A better understanding of
what kind of 'on-line' measures are useful is high on the priority
list.
Continued to work on the waveform generator: added precise timing
control, documented the algorithms used for producing the waveforms
and started on an interface definition to the digital-to-analog driver
(so that this task can be off loaded).
Physics Environment Monitor (Alex Marin)
-------------------------------------------
Matt and Alex are in Hanford for the 1st article test. Please read the
reports related to those issues. The PEM carts are up and functional.
One of them is beeing wired to the HAM for temperature and motion
measurements. The accelerometer tests are under way.
The PEM interface plates were installed into one beam tube. There
was an
inteference problem due to the change in the position of the seismic
support beams being shifted the 1/2". I ordered 1/2" shim plates
from a
local machine shop and will install them
today. The second support tube has a problem with the 3/8-16
threads which
prevents installation of the bolts. I ordered a tap set and will
retap
theles today.
Optical Contamination (Daqun Li)
--------------------------------
Teflon has been taken out of cavity one and vac-seal, spread on a
piece of aluminium foil, has been loaded into this cavity spacier
for contamination screening. This cavity has been locked to a
TEM00 mode continuously since Tuesday and day to day data taking
is underway.
The glass spacier originally assigned to cavity three is making
an alignment problem and therefore needs to be replaced. The
replacement spacier is being baked and is due back at the end of
this week.
-----------------------------------------
Control and Data System -- R. Bork
(WBS 1.2.2)
-------------------------------------------
Networking
============
- Concensus is to run Livingston fiber optics inside BTE, on floor
where it
meets the inside wall. Cable will be trenched from ends of BTE to pull
boxes
outside buildings for run thru conduit into buildings. Cable will be
spec'd
for
double armor, -20C to 80C temperature range.
Timing System:
==============
The clock fanout boards designs have been changed because of
a problem
getting a certain multipin LEMO connector. PCB layouts are still in
progress. We selecting cables and defining cable runs for the antennas
and
clock lines.
Input Optics:
=============
The OE Shutter Control has been tested. It needs a couple of minor
modifications before it is ready. Xing and Dale are finalizing the
schematic
for the demodulator board for the MC length control. We have not started
the
second board yet, should be starting in the next day or so. We are
stating
to work on the interface to the DAQ and control systems.
PSL
=======
The PMC Servo cards are being manufactured on a three day turnaround
and
should be in house early next week.
Began to get another frequency reference card stuffed for use in the
pre
modecleaner reflection locking.
Going through all materials lists to ensure all items are ordered for
delivery of 3 PSLs.
Began the submission of documents to DCC and generation of any missing
documents.
Suspensions
=============
- Still on schedule for installation of test stand and 2K suspension
control
racks at Hanford week of Aug 10.
| CR-980019 | WBS 1.2.1 | Development and Qualification of Core Optics Components (COC) Cleaning Procedures | J. Camp |
| CR-980020 | WBS 1.2.1 | Additional Lasers and Laser Support | J. Camp |
| CR-980023 | WBS 1.1.4 | Hanford Electrical Power | F. Asiri |
| CR-980025
CR-970020 (Revision A) |
WBS 1.1.3 | Beam Tube Enclosure, State Sales Tax Negotiations | F. Asiri |
| CR-980026 | WBS 1.1.4 | Civil Construction, Livingston, Hensel Phelps Closeout | F. Asiri |
| CR-980027 | WBS 1.2.2 | CDS Staffing | S. Whitcomb |
| CR-980028 | WBS 1.2.1 | Seismic Isolation and Suspension Staffing | S. Whitcomb |
| CR-980029 | WBS 1.1.3 | Additional Parking for the Livingston Site | F. Asiri |
| CR-980021 | WBS 1.2.1 | Laser/Optics Staffing | J. Camp |
| CR-980022 | WBS 1.4.1.2 | Project Controls (5N502) Actual Costs and Estimate-to-Complete | P. Lindquist |
| CR-980030 | WBS 1.4.2 | Document Control Center - Schedule Delays | P. Lindquist |
Assisted the Detector Group the shipment of three (3) cartons containing LIGO Isolation Systems Coil Spring P/N D97 22118 to HYTEC INC. of Los Alamos NM. (Attn: Mr.Tim Thompson) Arrival date of 7/24/98 Acct# 5F511
Submitted a formal request to the National Science Foundation (Mr.James D.Wilkins) via SF 122 for two (2) Forklifts. This request was approved, and delivery to the LIGO Livingston Observatory will be made prior to 7/30/98
Assisted the Optic Engineer with the preparation of a Commercial Invoice and shipment of four (4) Containers w/Carriers SN: 0004,005,006 & 007 valued at $5000 each to CSIRO in Australia (Att: Mr. C.Walsh/A.Leistner, via Centra World Wide Inc. Acct # 5F514.
Submitted a formal request for Government License Plates for the two (2) additional 40' trailers acquired from Sun River Electric for the Beam Tube Bakeout.
Visited the LIGO Hanford Observatory 7/13 thru 7/15 to conduct a quarterly Property Inventory and visited the Tri-Cities GSA Fleet Management Division (Mr. G.W. Davis) with reference to the possibility of Lease Vehicles for the both LIGO Hanford and LIGO Livingston Observatories.
A total of 17 documents were electronically submitted to the DCC. They were reviewed and placed on-line. Also, a total of 87 documents were added to the database. The following figures represent the breakdown by category:
| C | Contractual/Procurement Related | 56 |
| D | Drawings and CAD | 16 |
| E | Engineering Documentation | 3 |
| G | Graphics/Presentations | 2 |
| L | Letters | 7 |
| M | Management or Policy | 0 |
| P | Publications/Formal Notes | 0 |
| T | Technical Notes, Informal | 3 |
A total of 139 packages were received and distributed. An additional 38 packages were sent out. The DCC processed 108 incoming faxes and the project transmitted 112 faxes.
ACTIVITIES
Initial organization of the end item data package from PSI continues. Additionally, twenty-plus operational manuals, received earlier from Parsons, are being organized, numbered and entered into the database.
Six or seven boxes of end item data documentation, are expected shortly from CB&I. The DCC anticipates significant effort to organize, number and enter these into the database. Work continues on flow charts designed during the CB&I Completion Review.
Worked with committee on establishing an orientation process and procedures for terminating or exiting personnel. Provided committee with table of policies in the DCC and list of those still needing to be written. Dave Beckett is working on creating abstracts from policy memos for an orientation package.
I am working on a proposal which provides for the best use of the copy
machines currently owned or on lease by LIGO and to provide an adequate
copy machine for those moving to the sixth floor of Milliken Library.
Presently, all machines are on separate service contracts and lease options.
Negotiations are in process for consolidating all leases and service maintenance
agreements into one agreement and billing rather than individual invoices
and service contract renewals. This would have the advantage of a
more even distribution of charges. Currently, if one machine goes
over the total copies for a specific month, LIGO incurs overage charges;
but if another machine is under quota, no credit is given against the monthly
total. By consolidating, all machine usage would be combined before
incurring the extra charges.
1.4.3 Systems Engineering
1.4.3.1 Systems Engineering & Integration (AL, BB, CC, JK, DC)
__Integration Planning:
LHO Cable Tray Installation Specification
Bill Baldwin, Paul Kabot, Irena Petrac, Rita Tores, and Cleveland Mak
finished the cable tray specification bid package, mailed copies to
5
potential bidders, and completed internal distribution. Baldwin
and
Petrac will lead the job walk at the site next week. Bids are
due back
on or before 21 August.
Baldwin has begun modifying a copy of the specification for the LLO
cable tray installation. He is planning a trip to LLO during
the week
of 3 August to take electronic photos of the LLO vacuum equipment for
the new specification.
Lightning Protection
A mini-TRB was held to review incident of lightning damage at LLO which
occurred several weeks ago. We are pursuing re-hiring Krider as a
consultant to review implementation of our facilites design; we are
also pursuing an update to the cost estimate for the minimal system
RMP
recommended for the BTE during the design phase of the facilities.
Consensus was that some form of lighning protection is definitely
needed at LLO. Issue needs to be reviewed for LHO.
__Analyses: Nothing to report
__Reliability: Nothing to report
__Integrated Layout/Drawings: Nothing to report
__Mock-ups: Nothing to report
1.4.3.3 Modeling & Data Analysis (KB/HY/AL)
Misc:
All data analysis, modeling people and LIGO graduate students have relocated
to
new homes in Millikan.
Adlib:
* Multimode code is cleaned. * Single mode summation cavity has
been
updated including biplab's step-and-sum correction. A new summation
michelson is being written using biplab's approximation. Michelson
cavity of various setup - using primitive mirrors and summation
cavvities - are validated by SURF student. * C++ port of twiddle
is
going. sl++ lacks documentation and the code is written assuming
blitz++ can be compiled soon by egcs 1.1. * Changed modeler_base
tp
save the column headers to a file to be used later when displaying
data
- for ali, see below.
Alfi:
* Implemented feature which detects files that need to be saved. Warn
the user if the program is being exited with unsaved changes. Only
save
modified files. * Evaluated xmgr and gnuplot for displaying of
data.
Concluded that because the documentation for gnu plot is easier to
read, to use it for the first Adlib analyzer. * Incorperated
hot keys
for several functions such as save, quit, and editing a box. They are
documented in "Alfi - The GUI of the End-toEnd model (T-980014-00-E).
Data visualization for e2e:
* The direction of the data visualization of e2e has been discussed.
*
Started work on "ali" (pronounced "ally") and stands for AdLib
Inspector. Its purpose is to more easily view the data produced by
the
Adlib. * ali reads the data produced by modeler and send message
to
graphics programs to display it. It allows to access the data by name
and make it easy to define x-y-z variables. * In the future,
ali will
dynamically interact with modeler and graphics program, so that the
user can view the runtime data possibly changing the settings * For
the
graphics package, gnuplot was chosen for the first candidate.
* The
lateste version of xmgr and gnuplot were compiled and installed in
e2e
directory for this purpose.
Kent Blackburn:
The LDAS group held a meeting with visitors from VIRGO this week to
demo
and discuss the ROOT software package being developed at CERN. ROOT
is a
C++ version of the much older PAW package and includes a interpreter
that
using a significant portion of the C and C++ language (but not the
full
syntax!). ROOT has an very flexible object oriented data visualization
environment and VIRGO is working with CERN to extend the tools to support
signals (time and frequency domain).
KB met with Phil Ehrens upon his return from the TCL/TK class to discuss
what he learned and were TCL/TK is heading in the near future. Phil
has
also identified a method of using TCL/TK code in browsers that is not
based on the plug-in and may increase the portability of TCL code inside
of HTML pages.
KB installed Redhat Linux 5.1 on his laptop and downloaded the current
set
of patches. It took a lot of work but all the devices and services
now
appear to be working again after the installation/upgrade.
KB has found a few things (like glint) that are still not working well
on
the Alpha Linux workstation. KB has downloaded several dozen Redhat
Linux
5.1 patches and is currently installing/upgrading the OS.
KB met with Dave Berley this week to discuss the progress and recent
hires
in the LIGO Data Analysis group.
KB like so many others was consumed with the big move over to the 6th
floor of Millikan. Our new home is gradually taking shape with familiar
faces in the halls and things like telephone service and computer networks
beginning to come on line.
Dave Farnham:
I have been writing code to implement the generic API model. The
classes
I have been writing are:
Command - Generic base class for sending a command to another computer,
can be used to send simple commands.
The following classes are derived from "Command". They implement
more
complicated behavior:
CmdConnect - Instructs a process to initiate a tcp connection
CmdAccept - Instructs a process to receive a tcp connection.
This comes
in two flavors: ACCEPT_ALL and ACCEPT_FROM. The former will
receive a connection from anyone, while the latter will
receive a command from only the specified address & port.
CmdDisconnect - Instructs a process to close its connection.
CmdSendFrame - Instructs a process to send a frame through a
connection
CmdReceiveFrame - Instructs a process to receive a frame through
a
connection.
These classes contain the code which performs the commands. The
command
is sent from the "Host" (the code which is directly interfacing with
Tcl/Tk) through a socket connection to the "client" (the process
performing the command) vis ObjectSpace's object transport and binary
stream classes. The "client" then executes the command with the
proper
parameters.
For example, a client receives the SendFrame command.
It determines the frame which is requested via
CmdSendFrame::getFrameId(). It then sends the frame by calling
CmdSendFrame::sendFrame( FclHeader& frame ). The CmdSendFrame
class ( and
the CmdReceiveFrame class on the other end ) take care of all of the
There are 34 lines left (61%). Press <space> for more, or 'i' to
return.
the CmdReceiveFrame class on the other end ) take care of all of the
details. It makes sense to put the functionality in the commands
themselves since the commands define the protocol which is used over
the
connection ( it can therefore be changed easily without breaking code).
I have also written a couple of other classes:
Client - Represents a process which performs commands.
Conenction - Represents the connection between two clients.
Just to clarify what I mean by Host & client, this is how a simple
request
for a frame would work,
The user uses the Tcl/Tk interface to request that a frame be sent,
The
Tcl/Tk interfaces with the "Host" c++ code, calling a method or function
to send the frame. The host then connects to the sending computer,
starting a "Client" process. It also connects to the receiving
computer,
also starting a process. It sends CmdConnect to the sender and
CmdAccept
to the receiver, initiating a connection between the two. It
then sends
CmdSendFrame to the sender and CmdReceiveFrame to the receiver.
Finally,
it sends CmdDisconnect and CmdShutdown to both (unless the user wanted
to
send other stuff).
These classes will hopefully be a good starting point for the generic API.
The rest of the week was spent moving and setting up the new office
in
Millikan. "m27" was repartitioned and had Windows 98 installed.
I
documented all of the steps taken in this process.
Phil Ehrens:
* converted the mock LDAS interface into a client/server model using sockets.
* modified the client side script to source a file from the server for
most
of it's functionality.
* began to develop a 'remote' file-browser for the client which is capable
of controlled file I/O on the server. I anticipate this
to develop into
a browser model capable of interpreting a variety of data types.
Anderson:
Working with SURF student on actually implementing the LIGO
light-weight-data-format (SDF) on pulsar folding code.
COLLABORATIVE RESEARCH (LS Finn, Mohanty, Mukherjee, Romano)
Romano:
Writing a draft of a paper with Sam Finn comparing the
cross-correlation and maximum-likelihood statistics for stochastic
gravity-wave searches.
Mohanty:
I have been writing up the report on SEI/SUS modelling. Since the
beginning of this week I have been working on the part that describes
the formalism for a rigid body such as the mirror. A new but minor
point that appeared was that apart from the small angle approximation
which is required for linearising Euler's equations, one also needs
to
approximate torques as the cross product of forces in the space frame
with position vectors in the body frame. The correction term
is linear
in the angles but the coefficient is a time dependent terms. Hence,
in
the Laplace domain this term, if kept in the equations of motion, leads
to a convolution. At present I do not know how to include such linear
equations in the present form of the formalism. However, this should
be
a minor approximation since the term that has to be dropped is one
order higher in the angular displacements. It can dominate only when
the torque due to a particular force is small. But in that case that
torque will not dominate the rotational dynamics of the body. The
Green's functions for a wire with internal damping still needs to be
obtained.
Mukhevjee:
I have implemented the correlations between filter coefficients in my
Kalman filter algorithm i.e. I have included the non diagonal elements
in the prediction error correlation matrix. It works efficiently for
simulated data. The violin modes can be subtracted out leaving behind
the measurement noise.
There is one problem however. In the process of narrowbanding, in order
to achieve sufficient attenuation, I had first filtered the data over
a
20 Hz band using a finite impulse response filter and then over a 4
Hz
bandwidth with a Chebyshev filter. The high order of the fir filter
introduced start up transients in the response which lasted over a
long
time. The Kalman estimate was very sensitive to this "delay". The
subtraction was correct only when the delay was determined with
sufficient accuracy. This may not be convenient for online tracking
and removal of the lines. Hence I am trying to redesign the preliminary
filter in a way such that there is no lag. The fir filter was found
to
flip the amplitude. This has to be accounted for in the Kalman
filter
too. I am in the process of including these aspects in my code.
1.4.4.2 General Computing (LW/SS/SB/TE)
MIT: 1. Finished the move to the new building. E-mail is running
and
the computers are nearly back to normal. Our modems are not yet
installed, however.
2. Received and installed a new HP LaserJet printer so there will be
printing capability on each floor.
Livingston:
1. The digital camera, which came in last week, works beautifully.
The
floppy adapter and wide angle lens are backordered but should be
delivered shortly. The camera will, among other things, allow
us to
take pictures for ID cards for those staff members who haven't already
been to Pasadena.
2. A monitor went bad recently, and is going to be sent back to Gateway
for replacement. Regular software and hardware maintenance continues.
Hanford:
1. The PR for MATLAB is going out, now that we have decided which
tool
boxes and how many licenses to order.
2. Got involved in trying to figure out how we ended up with an
extra
PC and monitor. Paper work trail seems to be missing.
3. Wrote a procedure and made fonts available so that Exceed will
recognize Mathematica fonts.
4. Still waiting for a quote from the vendor for the ArteSTAK
backup
software.
CIT:
1. The network connection from Millikan to Bridge. It is being tested
in real
time in that people have moved over to Millikan and are connecting
up their
computers. So far there appears to be some latency issues that still
need to be
tracked down.
2. The server sirius crashed earlier this week and since has been getting
errors
related to one of the cpu boards. Some tests will be run over the weekend
along
with swapping out a hard drive to see if the warning messages clear
up. If not
SUN will be called in to replace the board.
3. Many of the purchase problems with SUN have been cleared up. The
units slated
for Caltech have finally arrived. The units for Hanford and Livingston
have been
re-ordered so they will be shipped while the people involved try and
figure out
where things fell through.
4. Installed the new Matlab license. There are now six seats on sirius
which
appear to still not be enough. Contact has been made with CCO to check
on using
some of their licenses as needed.
5. A couple more of the PC's have had to be reformatted and rebuilt.
It appears
there are some problems with the drivers and other s/w issues. Samantha
has
resolved the problems with Paul K.'s PC and is getting a laptop
configured for
travel.
6. Continual work on accounts and e-mail. Work is also being performed
on
getting a checkoff list made for setting up and removal of accounts.
7. The computer layout chart is about 70% complete and will soon be
sent to the
observatories to be red-lined.
8. (Barbara K.) Finished reviewing commercial packages for PDM.
The most
promising candidates are large packages that are expensive and require
an Oracle
database. Larry knows of a smaller package that I need to investigate.
Otherwise we should pursue developing an application in-house with
Access.
9. Returned to working on the new LIGO home page. Set up a new
directory
structure. Have links inserted in the home page. Now I'm fixing
the
intermediate and lower level pages.
10. Designed a new page for the LSC. Have sent it to R. Weiss
for review.
Made some other quick web page changes.
11. Began looking at the manuals for the WebBase server
12. MOU for T1 ESnet access at Hanford is still "in the works....."
Arranged and processed the paper work for 46 trips. This included 17 trips for our LIGO/REU/SURF students going to and from our Hanford, WA, site. Hanford's 4 students will be visiting LIGO/Caltech next week, July 27th thru July 28th. And Caltech's 11 students, along with Ken Libbrecht and his wife, will be visiting Hanford August 19th thru August 20th.
Worked on the ever present backlog of Expense Reports. Hopefully new trips will slow so that a significant amount can be done during this coming week.
Performed miscellaneous duties as requested by various members of the LIGO Project here at Caltech, as well as for members of the staffs of each of the two (2) sites.
Prepared and distributed the Weekly Travel/Vacation Itinerary Report for LIGO Staff and Visitors.
Processed Staff Payroll, incorporating various recent changes, new hires, terminations and the processing of Vacation/Sick Leave accounting.
Rita Torres
For I. Petrac did edits to RFQ IP-301 for Cable Tray Fab. & Install. at Hanford. Verified bidder addresses, prepared FedEx packages and did internal distribution.
For E. Jasnow verified and updated vendor list for EJ-298 for the Hanford Building. Calls to additional vendors, added in Hanford, to verify addresses and to weed out plan rooms. The updated list to receive Cancel Solicitation letter.
For W. Tyler refined notes from June meetings at LHO on laser safety issues. Also captured notes from Laser Safety Review Committee (LSRC).
For P. Lindquist distributed Draft end of May '98 Quarterly Progress report. For D. Shoemaker distributed memo and attachment for ASC WFS, FDR scheduled for 7/23/98.
Installed and got part way through tutorial for FileMaker Pro 4.0 to assist with travel details. I. Baldon guided me through the travel PR using the tool. As time permits, will explore other uses for this s/w.
Available for questions regarding move to 6th floor Millikan.
Elizabeth K. Wood
Sick for two days.
Met with Bill Tyler, Ed Chargois, Larry Wallace, and Linda Turner to discuss a final version of the incoming and terminated employee checklist. We also talked about the LIGO orientation and policy package we are creating for all LIGO employees.
Dealt with the continuing issues of employee relocations.
Arranged with the ID bureau to get key card access for LIGO employees and others who need to get to the Sixth Floor of Millikan.
Dorothy Lloyd
>
> Began reconciling April Status Report. Entered AP30 reports into
the
> database. Met with Britt to reconcile Lavernier civil contract. Continued
> processing the constantly growing requests for PR's. Processed POs,
Change
> Orders, Check Request, etc. as well as an extremely heavy load of
invoices.
> Followed up and tracked many problems with invoice payments. Continued
to
> monitored and support the temp. Continued to monitored and
support the
> temp. Provided clerical support were needed.
>
=========================================================
LIGO Hanford Observatory (LHO) Operations (F. Raab)
=========================================================
General Items:
--------------
BIG NEWS! The HAM Optical Table has landed!
I went out to admire the
completed 1st Article HAM SEI system, which is now being turned over
to the
performance assessment team, this afternoon (7/23). It sure looks pretty;
pictures will come soon. See Corey Gray's report below. Everyone
who worked
the HAM 1st-Article should be proud.
REU Projects:
-------------
(R. Savage)
RGA ANALYSIS (Betsy Weaver)
So far this week, Kyle Ryan and I have been continuing the assembly
of the
electrical control panel for the bake oven. We have mounted cable raceway
along the wall and have been busy making cable connections and routes.
We
have also continued taking RGA data, mainly overnight runs, as that
gives
us the longest set of data while not having to play with the its setup.
I
have done some analysis on the first set of data, such as calculating
the
pump speed and plotting the water partial pressure versus time to see
how
it falls off (roughly as one over time). I have also created
a "Bake-Oven
Data" shared directory on the oven computer "Azurite" where the best
data
has, and will be stored. There is also a log that better describes
the
individual data files in this directory. This log will continually
be
added to as more data is obtained. As well as playing with the
RGA, we
have also been ordering and receiving storage bins, tools, and other
bake-oven room items to be used during clean-room, bake-out practices.
PSL CHARACTERIZATION (Janet Casperson)
Last week I recognized an ultimately limiting aspect of Excel as a data
analysis program. I would have liked to analyze the data obtained
by
LabVIEW in discrete chunks, but Excel would not facilitate such an
operation. It is because of this that my attention this past week has
been
centered on the endeavor to find another program with which to read
and
analyze data. My first choice, Matlab, is not up on the Unix side yet,
and
the Student Edition that I have available on PC can not handle a large
enough quantity of points to serve my purposes. It is because of this
that
I have moved on to consider Mathematica. After much time and effort,
I
have a Mathematica notebook capable of all the calculations that I
have
wished to perform up to this point. Now that I have the rudimentary
tools,
I am now beginning in, again, with my analysis of the noise on each
of the
input channels.
TECHNICAL SLAB CHARACTERIZATION (T. Islam)
Dr. Gonzalez and I found some conflicts with the calibration as
well as the effectiveness of the air gap. For one, Dr. Gonzalez's
comparison of the spectrum garnered from the accelerometer with her
own
calibrated seismometer implies that the factory specs are correct --
1000
pC/g sensitivity, which implies 150 mV/g voltage sensitivity. Furthermore,
we determined that the transfer function across one air gap, the machine
room air gap, is much more complicated than it appears. It appears
to be a
complicated function of temperature, and ranges from nearly 1 at low
( <30
Hz) frequencies to 10 at higher (>500 Hz) frequencies. Simultaneous
measurements were made with the Endevco accelerometers over the air
gap.
There still appears to be a lot noise from other sources. I will need
to
short out the vibration isolation and then see how high the peak becomes.
ALIGNMENT SENSITIVITY OF ADVANCED INTERFEROMETER
CONFIGURATIONS (M. Zwikel)
After running over four hundred simulations of various misalignments
and
seismic driving velocities, my analysis of length and wavefront sensing
at
critical alignment is essentially completed. As discussed earlier,
my work
was conducted in the transitions to stages three and four of LIGO's
(first
choice) locking scheme. Generally speaking, stage three acquisition
will
be markedly easier, with the only influential misalignment being the
U1
(or M1 in the alternative basis I constructed for this stage) combination
of ITM and RM angles. Overall signal strengths in this stage
remain usable
even for fast mirror velocities (~10 micrometers/s), and signal shape
matches our expectations. Stage four acquisition is more difficult,
with
U1, U2, and even U4 producing critical degradation at around 0.02 expansion
angles. Still, this is a better result than expected, and signal strength
and shape are predictable.
My plans are to begin writing up my report for this summer's REU work.
Some
issues remain, but at this point my procedure and the lion's share
of the
results are nailed down. These simulations won't be complete
until we have
the power readouts in the IFO cavities, at which time an alternative
locking scheme may even be simulated, so I'll have to leave some
flexibility in the paper's structure. Depending on when the simulation
code update comes through, in a couple (?) weeks I may start work on
another (informal) project involving the dual-recycling IFOs of the
future.
Bake Oven:
----------
(K. Ryan)
The bake oven is ready to begin heating. We will begin tomorrow
morning by
heating from room temperature to 35 degrees Celsius. During the
first few
temperature increments we will be looking to establish that the controller
will function in both the set point on/off and the more sophisticated
time
integration and ramp soak modes. Later, during the upper temperature
increments, we will be experimenting with the settings of the variacs.
From
this, we should be able to determine the settings which will limit
the
maximum bake oven equilibrium temperature for the "continuous full
heat"
(failed controller) scenario.
A few misc. items need to be addressed before we can process real bake
loads. Of these, custom parts baskets still have to be obtained, the
parts
rack needs to be cleaned, three gauge cables have to be modified before
the
control panel door will close and procedures need to be submitted.
HAM 1st-Article Test:
---------------------
(C. Gray)
Full body Cleanroom suits were used for the first time.
Optics Table was placed on stacks (using aluminum dummy spacers).
Mark Barton, Alex Marin, Warren Smith, and Lee Cardenas arrived for
performance testing and/or to offer assistance.
Hoist Bar and Alignment Brackets put in place for lifting of Optics
Table
and Isolation Stacks for insertion of Springs. Safety issues came up
regarding the lifting of an inverted pendulum (Optics Table and 500
lbs of
weight) for roughly 3/4". Optics hardware were used as "Safety columns"
on
two corners of the Support Table; they had height adjustability.
For
corners of Optics Table, stops were also installed on brackets of HAM
chamber for safety reasons.
Lifting of Optics Table/Stack system with jacks went smoothly & safely.
During the insertion of springs we discovered that the two fixtures
for
locating the springs were not adequate and have to be reworked.
Spring
placement was done by eye. It seems that for the fixtures and circular
grooves on the leg elements, the diameter of the spring instead of
the
spring seats were used.
Began looking over staging of actual installation of HAM Seismic Isolation
hardware for 2 km detector with Lee Cardenas.
The loading of springs was the last step of assembly for the 1st Article
Test. This took roughly two hours. The HAM 13 Seismic Isolation System
now awaits Performance Tests by Mark Barton, Alex Marin, and associates.
BSC 1st-Article Test Support:
----------------------------
(H. Radkins)
The Scissors Tables on the North Piers were clamped down to the
Piers--fairly difficult because the Z motor drive is in place and limits
access.
The North Crossbeam was placed on the fully functional Air Bearing
Assembly. There isn't a Support Table/Downtube in place yet so they
are not
all tied together and so could not be floated. This revealed
some problems
with the procedure and those items have been addressed which will be
tested
when everything is redone with functional actuator/air bearing assemblies
on all four piers.
Two Support Tubes were installed into the chamber and bolted to the
V-Blocks/Crossbeams. This showed design and fabrication are in
generally
good agreement--offsets between the Tube and the 'E' nozzle indicate
fairly
good centering. Some work arounds for the Roller System and Rail System
were required but have largely been completed.
A Bellows was installed in a Compression Clamp and installed on a Support
Tube. Modifications are in the works for compressing the Bellows more
to
help put the Bellows in the Clamp and to remove the Bellows for
maintenance. The Clamp cleared the Crossbeam with ample room.
A single BSC Leg test Stack Assembly is being built-up at HYTEC for
testing. Analysis is ongoing for the Bellows maintenance removal
scheme.
Again, I'll be back at Hanford so redirect mail there; and keep it coming.
I'll try to make this transparent in the future.
Optics & Lasers:
----------------
(D. Cook)
Particle counts in the LVEA and under the HAM first article soft wall
enclosure were extremely dirty lately. I believe it to be due to a
lot of
PSI activity removing blankets and cleaning. We are starting to build
some
history on the particle counting. We will need to do some tests after
PSI
finishes cleaning up and these areas get wiped down and wet mopped,
etc.
Laser safety barriers and curtains should be in next week. Other supplies
continue to arrive. The balance of the Optics Lab Clean station equipment
should be delivered this week.
Computing Systems:
------------------
(C. Patton)
This week has been busy with ordering and problem fixing. The
PR for
the E3000 Service contract has gone out. I'm waiting on the vendor
for
a quote for our automated backup software. We have decided which
tool
boxes to order with MATLAB, so that PR will be going out today. I'm
continuing to add to the list of supplies needed, such as fire-proof
storage for backup tapes.
I've written and distributed to everyone at LHO, a procedure for getting
Exceed to recognize Mathematica fonts. I created a new directory for
the Exceed format fonts on the server's disk with the user accounts
so
everyone can get to them.
I created a new user account for and worked some with Serap Tilav to
get
NTP time server on the GCnet server. This software will get GPS time
from the University of Washington and will synchronize all the Unix
computers to the GPS time. Serap was able to get the software to
compile on our server and to install it, but couldn't get the daemon
running.
The GC Conceptual Design document is just about done.
Beam-Tube Bake Out:
-------------------
(M. Lubinski, M. Guenther, K. Stiff and W. Althouse)
Electrical Support Services Contract:
Report from Sun River
Accomplishments:
Major focus on work this week was on the second set of connexes at the
Sun
River Electric Shop. These connexes are for the Y-1 placement.
Two each
40 foot trailers were prepped for equipment assembly placement.
Problems/concerns: No problems or concerns encountered this week.
Mski note: Sun river has lifted the two connexes onto the flatbed
trailers
and are currently planning to deliver these trailers on site the week
of
7/27. Watt Insulation has re-insulated the Y2 beam tube and removed
some of
the insulation on Y1 from Y1 in preparation for bake out of Y1.
Cryopumps:
Cryopumps are currently mounted on ports Y2-2, 3, 4, 6, 7 and 8.
Y2-2 and
3 were leak checked and tested "OK". We have a cryopump in operation
on
port Y2-3. Mark Guenther is setting up to gather data on it.
See valve
report for further info.
Beam tube port valves(10" VAT)
VAT will be on site 7/28/98 to adjust 7 of 9 valves on Y2. A memo
(L980395-01-W) summarizing testing and findings has been submitted
to
/home/dcc/IN and is available for reading.
Data Acquisition and Temperature Control System:
Report from Mark Guenther:
The GE software fix received last week continues to work well. Logging
of
beam tube and beam tube enclosure ambient temperatures continues, and
is
being archived. Beam tube voltage signals have been connected,
and the DC
power supply cooler signals have been connected and their calibration
checked during a test run of the coolers. Wiring specifications
for the DC
power supply control, monitoring, and shunts have been sent to Sun
River.
For additional information about this report, contact sanders@ligo.caltech.edu