The Project Control Meeting
Agenda for Monday April 27, 1998 will be:
(Meeting time: 10:30 am Pacific Time)
WBS 1.1.1 Vacuum Equipment(Worden)
1. Gate Valves:
a.Re:O-ring failure at GNB - PSI is waiting for a written
report from GNB on this item.
b. Hanford valves - Two more valves have been found to have
leaks. One is a right mid station valve which appears to have
a leaky bellows(same fault as the end station valve). This leak
showed up as an air signature during RGA measurements but
required 1/2 hour of helium pressurization before a signal showed
at the HMS. Apparently GNB exposes this same area to Helium
but only for 10-20 seconds.
The other leak was in the corner station and was a leaky
weld in a small conflat at the mechancal lockout lever.
This leak has been repaired.
Since GNB's testing is obviously in question PSI is beginning
to plan the testing of all site valves in situ. I am incouraging
this.
2.Several MIT spools are all that remain to be put through
the bake/test cycle at PSI.
3. LA chambers continue to arrive. The 80K dewars were
set this week. PSI is also moving a BSC into the right
end station.
4. Hanford vibration/shock/noise measurements: Kyle Martini
(Cambridge Acoustics) and Mike Zucker have been making
measurements in the left arm mid/end stations of
pump and valve noise.
5. Installation activities:(Kyle Ryan)
X-arm end station:
PSI is waiting for GNB to finish supplying
Louisiana valves. After this is done, they
will have GNB come on site to repair the leak-
ing bellows associated with the lead screw of
the 44" VE gate valve.
X-arm mid station:
Same as above for the leaking 44" VE gate valve.
In addition, only half of the 2500 L/s ion pump
is operational. RGA data was generated after the
VE bake out but has yet to be analyzed. The air
leak due to the valve and the reduced pumping due
to the partially defective ion pump will be con-
sidered when looking at the RGA data but it is too
early to tell if another bake will be required.
PSI cannot do much until the leak is fixed so they
have concentrated on the Corner Station Left BT Man-
ifold.
Corner Station:
PSI has removed the spool piece connecting the BT gate
valve and the long 80K pump on the left vertex section.
This will facilitate the repair of the damaged bellows
which surrounds the vent line on top of the pump.
JW - It appears that this bellows was damaged during the
"pull tests" of the Bi-braze fittings several months
ago.
Additionally, they have valved off this 80K pump from the
rest of the Left BT Manifold and have pumped down the re-
maining isolatable section. He leak tests are being per-
formed on this section and preparation for baking it are
under way. Sun River is down to two workers. They expect
to be finished this week.
Y-arm mid station:
Shock tests are being performed today (PSI and Kyle
Martini). This involves cycling the valves while mon-
itoring accelerations.
Y-arm end station:
PSI, Kyle Martini and Mike Z. performed vibration and
shock measurements over the past couple of days. Part of
the vibration portion will have to be redone as the LN2
level in the 80K pump was higher than the "fill line".
This resulted in bubbles being produced as the vapor portion
of the incoming liquid/vapor mix passed through this ele-
vated liquid level on its way to the boil off/vent line.
These bubbles resulted in higher vibration levels.
Livingston Site
Vacuum Equipment (Allen Sibley)
PSI continues to make good progress. A BSC an 80k pump have been placed
in
the
x arm end station. Problems with the overhead door in that end station
have
been temporarily fixed and a permanent fix is on the way. Clean rooms
are
assembled for the LVEA and are being moved in. The LVEA floor has been
cleaned by LIGO and has been accepted by PSI,as have the end stations.
We
are continuing to explore the reason that the x arm end station A/C
continues to drop out. Current thinking is that the supply voltage
is high
and we are in contact with DEMCO to resolve this problem. All LN2 tanks
have been installed. A RFQ for supplying these tanks by 6/8/98 is out
and
there should be no problem in getting LN2 supplies in time for PSI
needs.
1.1.2 Beam Tube (L. Jones)
a. Tube section fabrication status, Magnolia
Beach shop
(running totals):
Leak Leak
Formed Tested Failures Cleaned Shipped
as of 4/14: 380
358 0 358 300
as of 4/21: 395
370 0 370 316
The fabrication shop will begin demobilization
activities
shortly after being toured by the PAC meeting
participants.
This is initiated with the shutdown of the
spiral mill,
once the 400th tube section has been welded.
We have
decided to not accept CBI's offer to make
spare tube
sections at a reduced rate. Alternatively,
BTE installation
will be reviewed to confirm that the concrete
sections are
not lifted over exposed beam tube during installation,
to
minimize the risk of tube damage.
b. Tube section installation
status (Livingston site):
(running totals):
Inside Leak Leak Final
Welded
Repairs Tested Failures Aligned
as of 4/14*:
297 20 294 0
0
as of 4/21*:
312 20 310 0
0
* Includes gate valves
as the finish "tube sections"
Turbopumping of the X arm
continues, with tube pressure now
in the E-7 torr range. RGA
baking is being conducted, and
the first accumulation (entire
arm) is expected about 5/1.
The earlier report of an 18 mm error in the placement
of
the Vertex and BT/VE1 interface monuments turns
out to be
incorrect. This measurement was made based upon
an earlier,
errant mark on BT/VE5 which had not been fully obliterated,
instead of the proper mark which had been hidden
by grout
material. However, the SJB recheck did find the
vertex and
BT/VE1 marks to be in error; these were remarked,
at offsets
of 7 mm and 12 mm, both in the -X direction, respectively.
CBI measurements at BT/VE4 now show that it is in
error by
13 mm in the +X direction, as referenced by the
latitudes/
longitudes supplied by LIGO. SJB is rechecking that
as well.
BDF air flow performance
since 4/14:
Particulates (0.5u)/cu ft:
22 (max., any day)
Dew Point, degrees F: 1-5
Temperature, degrees F:
46-66
Of the 310 tube sections
installed, 280 have now been covered
with enclosure sections.
c. The monthly project status review was held at
Livingston on
4/16/98. Significant items were as follows:
1. CBI reported in the meeting
that Balzers suspects
that the ArcNet cards (used with
the fiberoptics
networks for daisy-chaining RGA
hubs during module
leak location) are the cause of
the networking
problems. Since the meeting, this
has been updated
to finding the cause within the
hubs; Balzers expects
to have hardware to CBI in about
4 weeks, which would
be in time for any needs at Livingston.
2. We discussed PSI's needs for
termination valves to
be in position in the corner and
end stations for
their planned operations. Their
need of 6/15 at the
corner station will be met by
CBI's scheduled
completion. However, their need
of 5/11 at the end
station is prior to CBI's arrival.
If CBI were to
set the termination valve early,
it would have to be
moved for CBI's setting of the
final two tube sections
and then reset. Worden agreed
that it would be best
to have both PSI and CBI to use
BT/VE4 marker as a
reference for positioning, and
to have PSI leave the
expansion joint off of the 80K
pump to allow CBI room
for installation. If necessary,
after CBI sets the
termination valve, PSI may request
a slight adjustment
of the valve by CBI in order to
install the expansion
joint. There is no plan now to
set the valve early.
3. CBI demo'd a BTE coring above
the BT model, and
showed the hardware for the PVC
tube assembly that
serves for accessing the beam
tube support ring by
GPS equipment. This design is
now approved, and CBI
will be starting the installation
of the 34 units
on the X arm. Hand reported that
GPS measurements
at Livingston require additional
and longer duration
shots, compared with Hanford.
4. Riesen and Hand instrumented
the X arm modules
for end movement due to pumpdown.
Movements were as
expected from measurements made
at Hanford. CBI
made torque measurements of the
anchor bolts at a
termination support, and developed
limits for future
installation. Anchor installation
details are being
better documented by procedure
and drawing.
5. CBI provided prices for their
used GPS equipment,
once the task is complete. We
will review these for
consideration of purchase.
d. Planned meetings:
6/2/98: monthly project status review, Livingston site
7/1/98: Completion Review, Livingston site (performed
early due to manpower availability)
Hanford Construction (Otto Matherny)
Levernier
Consolidated Punch List
Total punch list items remaining- 58
Total Corrected-
45
Total Signed off-
45
OTHER ITEMS
HVAC VANE AXIAL FANS
All the vane axial fans on site were
balanced and tested.
The maximum allowable variance is 0.3
mils run out
at the low, mid and high range. Fan
number 6 exceeded the
specified vibration limit at 3600 RPM
(mid range)
by 0.01 mil. All the other fans were
below the
specified limit. Fan 6 will be conditionally
accepted.
The vane actuator for fan 2 was found
to be inoperative.
New Philadelphia Fan Company will repair
the actuator.
Livingston Construction (Gerry Stapfer)
Hensel Phelps
Most of the punch list items have been completed. What remains, are
the
water integration and the storage building. The issues with the HVAC
are
being addressed and will be resolved as solutions are identified and
implemented.
Woodrow Wilson, has started the chip and seal operation along arm-2.
The
current river pilot strike has impacted this task. The barges caring
the
gravel are laid up somewhere in Tennessee. We are trying to find a
work
around, using available local materials, the specs for which has been
sent
to Parsons for evaluation as a possible substitute.
Date: Thu, 23 Apr 1998 23:30:00 -0400
From: David Shoemaker <dhs@ligo.mit.edu>
----------------------------------------------------
-----------------------------------------------
Implementation Group -- Mark Coles/Fred Raab
-----------------------------------------------
40m (Jennifer Logan)
--------------------
We had the first failure on the Mark II vacuum system. One of
the
solenoids which controls a vent valve on the annulus line (pumps out
between all the double O-rings on the chamber doors) failed and when
it
failed it opened the vent valve leading to the entire annulus line
being vented. The controller for the valve has been sent over
to CDS
for repair. The pressure inside the main vacuum system was unaffected.
Work on the interferometer continues on two fronts; after making
careful measurements over the past few weeks of the arm and recycling
cavity parameters, using a fast photodiode to look at multiples of
the
modulation frequency, we are now returning to work on the wave front
sensing. We are also starting to get the interferometer back
into
operation since for the past several weeks we have been studying
sub-sets of the configuration. We aim to start looking at the
technical noise present in the system, particuarly in the form of line
spikes which were very bad in the last run of recombination.
----------------------------------------------
Interferometer Sensing and Control -- P. Fritschel for M Zucker
(WBS 1.2.1.1.6, 1.2.1.1.7)
----------------------------------------------
Lock Acquisition (B Ware):
==========================
Worked on increasing the gain of the L- controller in order to acquire
and maintain lock in the presence of ground noise. Implemented
the
detection mode controller into SMAC -- due to the complexity of this
controller, it involved modifying the Fortran modelling code, which
led to me learning more about Matlab and APIs than I intended to.
ISC Design/Testing (N Mavalvala/P Fritschel):
=============================================
LSC Detection Mode Controls:
The design for the common mode loops has been refined to meet
all requirements. In particular, we needed some redesign to
meet SRD/10 requirements for frequency noise at frequencies
below 40 Hz. Since there is no spec on frequency noise below
40 Hz, estimates were made based on out-of-loop measurements
by S. Seel et. al of the frequency noise from the PSL. The
violin modes remain to be added and some minor design tweaks
are needed.
ASC Initial Alignment (K. Mason)
=================================
Documentation for the Initial alignment final design review was
distributed. The final design review is scheduled for 4/30/98. The
Initial Alignment procedures were updated to include both 2k and 4k
interferometers.
PNI digital loop test (PF/E Daw):
=================================
The unwhitening filter (to follow the DAC output) was completed.
The analog electronics needed for this test is now ready to go.
We've also determined the digital filter functions that we need
to implement, and once we get the code written for that we can
give the system a try.
Ed has installed a VMEbus analyzer in the crate, and has been
using it to track down some timing glitches in the 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)
--------------------------------------------
10 W Laser Contract -- Jordan Camp
------------------------------------
D. Wallace called to say that LW is preparing an advertisment and
presentation at the CLEO conference on the performance of the 10W
laser. They are listing it as the Series 600 MOPA, an advanced product.
Prestabilized Laser -- Peter King
--------------------------------------------
- R. Abbott has re-worked the intensity stabilization servo. The
current
VMEbus board was determined to be salvagable enough to proceed with
a test.
- The PSL is preparing for a duration test. This has meant gathering
up
various pieces of equipment and trying to make sure that the various
cobbled
together servos are available at the same time.
Input/Output Optics -- Dave Reitze, UF
-----------------------------------------
Mode Matching Measurement
Finished the soldering of the wfs head and demod
boards. Also acquired a 250KS/s,12-bit, multifunction DAQ board for
processing the signals and driving the mirror motors. Balancing and
testing of the Bullseye diodes is underway. THe experiment
has been modifed to measure the reflected light from the PSL reference
cavity, rather than set up a second cavity. This has necessitated
some
changes in the optical set-up; namely, the reflected cavity signal
now
must be sent to both the length sensing photodiode and as well as the
bulllseye. We are putting in optics to allow for sufficient light
levels
on the RFPD and the two bullseye diodes.
In vacuum components:
We talked with manufacturers of polarizers and rotary stages for vacuum
compatibility.
(1) Newport
Newport says they cannot make rotary stages meeting the LIGO requirement.
(2) CVI
CVI says (i) they cannot make calcilte (cubic) polarizers using customer
specified epoxy. (ii) they can make rotary mount meeting the LIGO
requirement (ie, no grease, all metal unanodized) but they cannot
guarantee the performance
(3) Karl Labmrecht
(i) They can make calcite polarizers with customer specified expoxy
(ii)
They have experiences to make lubricant free rotary stages. According
to their experiences, such rotary stages are rotatable but not 360
degree.
Since the surface of the stationary part of the stage along which the
rotationary part rotates is not perfectly flat, if lubricant is not
used,
there is some location where the friction is too high to let the rotary
part rotates further. Thus as soon as the rotationary part hits such
a
location, it gets stuck. However, as far as the polarizer is concerned,
the housing has a jum nut that allows to fix the housing at any
orientation relative to the rotary stage, it is possible to adjust
the
orientation of the polarizer even if the rotary stage does not rotate
at
all. Unfortunately, their standard rotary stage is too thick for us
to use
in the vacuum chamber.
We supplied Karl Lambrecht with sample Vac-seal and asked them to try
to
make a cubic polarizer. They say that they tested and the result was
good.
The amount of Vac-seal they used is ~2 grams to put two calcite
prisms
together and ~10 grams to fix the two prisms in the housing.
However, since Vac-seal has the potential for hydrocarbon contamination,
we are also looking into thin film Brewster polarizers. We have
done some
preliminary measurements on TFPs, they have poorer extinction ratios
(100:1 instead of 10^5:1) and are harder to align. In addition,
there is
some question of reflected (rejected) beam quality being degraded.
Since
these polarizers will feed the ASC WFS, we want to look at this more
closely.
In vacuum Layouts:
This week was spent working on the plan and elevation drawings
for HAM's 1 and 7. More specifically the faraday isolator which
has
proved to be quite frustrating. In addition, some time was spent
making
sure everything was up to date on the PSL tables. Also, after
talking to
the machinists there were some corrections to be made on the in vacuum
mirror mount drawings. The main correction and only physical
change was
that the tapped and counterbore holes for assembly are now centrally
placed instead of slightly offset. This will make it easier for
the
machinists to build as well as increase the strength. The
other changes
all involved dimensions which I had not been completely clear in
specifying.
Core Optics Procurement and Metrology -- GariLynn Billingsley
-------------------------------------------------------------
Gari is on travel this week.
Core Optics Coatings -- Helena Armandula
--------------------------------------------------
Helena is on a 3 week leave of absence.
Core Optics Support -- Michael Smith
------------------------------------
EDGE DIFFRACTION FROM THE APERTURE IN A TILTED BAFFLE:
The previously calculated edge-diffracted power is reduced by a factor
>1E-5, according to a recent analysis of the reduction in edge-diffraction.
COC ANNULAR BAFFLES:
Annular baffles are avoided because of the reduction in edge-diffraction,
which allows the COC aperture diameter to be made slightly smaller
than the
COC diameter .
BAFFLE CALCULATIONS:
A white paper describing the baffle calculations, "Baffling Requirements
for the 4K and 2K IFO" LIGO-T980027-00, has been completed and will
be
filed shortly with the DCC.
PO TELESCOPE:
Dennis R. has implemented a Gaussian beam propagation model in Zemax
which
models the beam waist size and location through the entire COS PO beam
optical path, starting with the beam waist inside the IFO out to the
delivered beam waist on the ISC table. The model allows a determination
of
the defocusing of the 3X ISC telescope to locate the output beam waist
at
any position within the ISC table.
MIRROR MOUNTS:
Ken M. has been collecting an assortment of off-the-shelf mirror mounts
for
evaluation. An experiment to evaluate the beam-pointing stability of
the
various mounts is being designed.
BEAM-DUMPS:
Ara B. is back on the board designing beam-dumps. The IR transmissivities
at 1064 nm of samples of #10 and #14 standard welding glass were measured
to be < 5E-8, by Mike S. with the help of Daqun L. This is more
than
adequate for the beam-dump surface.
---------------------------
Isolation Group (Mike Fine)
---------------------------
1. Assembly Fixtures:
Hand Precision has shipped all of the Phase I assembly hardware that
has been
checked out to Hanford. The only remaining pieces are the optics
plates that
mount on the adapter plate and the HAM piping platform legs.
This hardware
is currently being checked out at HYTEC. Phase II hardware (roller
and rail
systems for support tube installation) will be shipped out of Albuquerque
(Vertex) on Saturday. An order for the Phase III assembly hardware
for the
HAM has been placed. Delivery times are 3-4 weeks for this hardware.
2. In-Vacuum Hardware:
Allied has completed the welding on the first HAM Support Table, and
is now
working on the final machining of the part. The programming for the
HAM
Optics Table is ongoing. Allied expects to begin cutting the material
for
the optics table this week. The HAM support tubes are ready to be cleaned
and baked and will be shipped to Hanford by the end of next week.
3. Air Bearing Assembly:
The air bearing prototype testing was scheduled for 4/28 at Specialty
Components. Witnessing the test will be Tim Thompson and Erik Ponslet
from
Hytec and Bill T and Mike F from CIT.
Suspension -- (Janeen Hazel/Mark Barton/Fred Raab/Mike Fine)
------------------------------------------------------------
1. LOS Weldment:
Brookfield has completed two height adapters. The 1st article welded
structure
is waiting for thread cutting, then stress relief. Upon completion
the
hardware will be shipped to CIT for fit/form check.
2. LOS Fixtures:
Schober's is starting to deliver the smaller piece parts this week.
The
fixtures are about 40% done. They expect to finish up that work this
week.
---------------------------------------------------------
Detector Systems Engineering -- D. Shoemaker/D Coyne
(WBS 1.2.1.1.9)
---------------------------------------------------------
___Installation Planning
The "Detector Installation Planning: Source Data" document (M980010)
is
being revised to reflect the latest projections in detector delivery
schedules and should be issued next week. The installation schedules
will then be revised to be in accord with this document.
A (draft) LIGO Livingston Observatory (LLO) schedule has been placed
on
the Integration Web Page. This schedule projects too high a peak labor
demand in early 1999 and will be revised to reflect a more workable
schedule ( in conjunction with the Hanford combined 2km & 4km schedule
which is currently being reviewed/revised).
The Web Page has also been restructured; The
main integration web page is:
http://www.ligo.caltech.edu/~coyne/index.html
or
http://docuserv.ligo.caltech.edu/~coyne/index.html
>From this main web page, click the link "Installation & Commissioning"
to get to the installation planning information, like the new LLO
schedule -- this brings one to:
http://www.ligo.caltech.edu/~coyne/install.html
There are a number of other recent additions to the web page including:
- latest projected noise spectrum curves
(and associated interferometer parameters)
- integrated layout drawings
If anyone (particularly outside of CIT) can not get access to the web
page, please let Dennis Coyne know (coyne@ligo.caltech.edu).
Global Diagnostics System
(Rolf Bork, Paul Govereau, Mark Pratt, David Shoemaker, Daniel Sigg)
--------------------------------------------------------------------
Software development for GDS continues this week. MP continues
work
on the excitation system, DS on the scheduler and PG on c++
infrastructure. In addition, a fair amount of effort is going
into
constructing and maintaining a development environment that works
across all of our platforms and sites.
Physics Environment Monitor (Alex Marin)
-------------------------------------------
We are working on the detailed schedule of installation and
tests before and after the installation of various PEM subsystems.
In
parallel we are continuing to order parts for the final PEM configuration
according to the preliminary integration schedule.
For 1st SEI article test, PEM will support all uses
of the PEM
system. We already received parts of the DAQ system and the PC is
schedule to be delivered at MIT arround May 1st.
Shourov and Sarah are working on the data aquired
at the two
sites, and mainly on the correlated events between the sites.
Optical Contamination (Daqun Li)
---------------------
The third contamination cavity bakeout has started and this bakeout
is
estimated to last for about a week before setting it up in OTF lab
for
qualification test. In the meantime, ringdown and mode spacing
data are
still taken from the two contamination cavities (one contains kapton
cables;
other is empty for cavity requlification)
Non-Optical Contamination (Matt Smith)
--------------------------------------
No report received.
-----------------------------------------
Control and Data System -- R. Bork
(WBS 1.2.2)
-------------------------------------------
Vacuum Controls
===============
- Livingston control racks assembled and tested at Livingston over
the past
two
weeks; systems are ready to install (PSI need date is June 1); work
remaining is
to load stand-alone workstations for tests with PSI in end stations,
gate
valve
interlock module setup, and insertion of remaining VME modules when
they
arrive
(due April 30).
Control Area & Networking
==========================
- Livingston ATM system installed and operational. Fiber installation
for end
stations will be in August (date PSI will allow entry).
- Fiber install at Hanford complete; testing is being finished up this
week.
- ATM has been extended to mid stations now that fiber is in; end stations
should be connected next week.
- Order placed for control room furniture at Hanford.
Data Acquisition
=================
- FDR date set for May 8.
- Remaining issue for final design is time stamp standard (GPS, UTC,
IAT,
??);
Meeting to be held next Tuesday afternoon to come to agreement.
PSL (R. Abbott)
================
1. Work has been done on the prototype intensity stabilization
servo
with the goal of finalizing the design. Actual testing of newly
revised
circuit board to begin 23 April.
2. Worked in collaboration with R. Burgess of MIT on creating
a new
wide band high voltage pockels cell driver for the frequency servo.
This
is attractive due to the bandwidth requirements of the feedaround input.
3. Created new high voltage drivers for general lab use in the
psl. The
folks in the shop are putting them together now.
4. Began to layout 4 channel temperature sensors for PSL Tidal
actuator
system.
CDS Mode Cleaner Servo: (D. Ouimette)
======================================
Detailed schematics for the prototype demodulator board are almost
complete
and we will begin the PCB layout. A PCB layout is close to completion
for
the Electro optic Modulator controller prototype. The first of the
new RF
photodiodes is being sent to MIT today for testing. We have 9 more
from this
run that we are assembling and testing now.
CDS LSC: (D. Ouimette)
======================
A new LSC block diagram is nearing completion. This will show in detail
all
of the length sensing topology including frequency control. A prototype
front end signal conditioning filter (whitening filter) is in progress.
I
tested the 4.19MHz GPS clock which will be used for all of the ADCs
and DACs
in the digital controls as well as the data acquisition subsystem.
I used an
SRS time interval counter to measure 10e6 clock periods. The spread
from Min
to Max was about 15 nanoseconds with a sigma of 1.25 nanoseconds out
of a
total period of about 240 nanoseconds (1/2e22). This is very good but
an
interesting result is that when I measured the 16 KHz clock period
out of
the same GPS module the spread was about 300 nanoseconds Min to Max
with a
sigma of about 80 nanoseconds. Naively, one would think that the absolute
time variation would be about the same since the 16 KHz is simply counted
down from the 4.19 MHz. What this result means is that the 4.19 MHz
clock
can have a long string of say plus 7 nanosecond periods followed be
a long
string of minus 7 nanosecond periods. They will average out for the
4 MHz
clock but will add up for the 16 KHz clock producing larger variations.
We
are not planning to use the 16 KHz clock output but the ADC's internal
count
down will have the same effect.
Suspension (J. Heefner)
===============================
- SOS Controller final component placement is complete. Board routing
will be
started following LOS controller routing completion.
- LOS controller final routing is 90% complete and should be done by
4/25.
- Satellite module prototype testing is complete. Final schematics
are being
updated.
- Sensor/actuator head coil winding and LED/PD installation has started
for
the
IOO SOSs. The LOS heads have not yet been received from the manufacturer.
- WA 2K IOO rack cross connect wiring is complete and will be shipped
to
Hanford
next week.
- Hv power supplies for WA 2K COS systems have been received.
ASC/LSC (J. Heefner)
===============================
- The Spectrum DSPs are now operational and have been connected to
the Pentek
module via the comm ports. Initial testing of the Spectrum DSPs show
that
they
are approx a factor of three slower than the Bajas for IIR filter
calculations,
but comm port communications allows us to eliminate the need for VME
interrupts
and VME reads to check FIFO status bits. In addition the comm ports
allow
individual ADC pairs to be assigned to individual DSPs which makes
it
possible
to acquire data from the ADCs in parallel. Tests are currently under
way to
determine if the overall throughput of a DSP based system is higher
than a
Baja
based system.
| CR-980007 | WBS 1.1.5 | Beam Tube Bake, Adjust Budgets to reflect experience |
| CR-980011 Rev A | WBS 1.1.5 | Beam Tube Bake, Electrical Power |
| CR-980012 | WBS 1.1.5 | Beam Tube Bake, Leak Detector, Redundant Valves |
| CR-980015 | WBS 1.1.1 | Miscellaneous Vacuum Equipment Mods to reflect changes to the PSI payment milestones |
| CR-980016 | WBS 1.1.4 | On-site Telephones, Hanford |
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LIGO QA continued to work with Rita Torres, Joanne Jaramillo and Mike Zydowicz to format and edit Hanford operational procedures.
LIGO QA has been working with Allied Engineering to come up with an
acceptable packaging approach that will satisfy LIGO's UHV packaging requirements.
Allied has proposed the use of an alternate supplier of clean bags. A visit/review
of this supplier is planned in May to check out their capabilities and
bag materials for LIGO use.
1.4.3 Systems Engineering:
1.4.3.1 Systems Engineering & Integration (AL/BB/CC/JK/DC)
(by CC)
a) Worked on optic suspension production drawings. Currently working
on
the weldment of the LOS2 frame, for which all parts have
been detailed.
b) Assisted Bill Baldwin on the cable tray effort.
c) Also COC Carrier stuff which is reported to Dennis Coyne.
(by JK) A. Lazzarini's comments on the initial draft of PEM and COC
sections of LIGO Maintenance Plan were incorporated. File pointers
have
been provided to D. Shoemaker and A. Marin for PEM MP section review.
Hardcopy given to S. Whitcomb for COC MP section review.
(by PK):
HAM LOWER HALF MOCK UP
The Ham half mock up is nearly finished and is slated
to be
shipped on Monday,4/27/98, to arrive by approx.
Wednesday
4/29/98 in Hanford. Ed Chargois is handling shipping
arrangements.
ELEVATED PLATFORM MOCK UPS
Have received a couple of replies & am expecting
additional
product information from a few companies on platforms
with
larger work surfaces then the one unit that we purchased.
Will
try to have enough data to make a decision on purchase
plan by
Tuesday of next week (4/28/98).
HAM 84" ACCESS & 14" ("E") NOZZLE GUARDS W/COVERS
Have finished the drawings except for a few dimensions
which
Rick Savage will be furnishing.When drawings finished
&
approved, will send out to a local supplier of Ricks
for a
comparison quote.
CDI DRAWING RELEASE
Currently assisting Janeen on release of CDI optical
alignment
fixture support equipment drawings. Expect to be
finished
tomorrow, Friday.
MIT LEVER LAYOUT
This project has been on hold due to other priorities.
Hope to
finish this by 4/28/98, or 4/29/98.
WASHINGTON OPTOMECHANICAL ILD'S
The Mid Station xref's are set up waiting for input
from the
various groups (IOO, ISC,COS). When time permits,
will also set
up End Stations.
PSL/IOO XREF LAYOUTS FOR ILD'S
This is not started yet due to current priorities.
Will start
assembling the Optical Enclosure (PSL/IOO table)
package near
the first of next month and hopefully receive input
on the PSL
and the IOO layouts by the middle of the month.
Cable Tray Specification:
Bill Baldwin is working on the second draft of this specification
which will include a complete set of figures. We plan to send
out
this draft for comments this week.
Naming Conventions Document:
Baldwin is nearing completion on the second draft of this document
and will be requesting task leader's help in completing the Hardware
Configuration Item List tomorrow.
1.4.3.2 General Computing (LW/TE)
MIT:
1. Received and installed version 5.2 of Matlab.
2. Starting preperations for move in to the new facility.
3. Resolved some security issues that have taken place.
Livingston:
All of the following were done with Larry Wallace, Dave Barker, Rolf
Bork,
Christine Patton, Juilien Svoboda.
1. Installed fiber from mass storage room to communications room.
2. Installed HP plotter and loaded drivers on a group of PC's.
3. Move a rack into the communications room and installed the appropriate
network/ATM units. The set up of the ATM equipment similar to the Hanford
system.
4. Moved the network over from the old Avante fanout box to the FORE
3810.
This put things on to the ATM switch system. A large number of 7 ft.
cat 5
cables need to be purchased in-order to accommodate the distances of
the
connections from the punch down block to the fanout box in the communications
room.
5. Down-loaded and installed various s/w packages for the PC's.
6. Resolved various hardware issues with the PC's and printers.
7. Received a new printer and scanner. To be installed by Techmaster.
8. Techmaster installed the new laptop computers.
Hanford:
1. Christine Patton has been tagged as the System Administrator for
the
Hanford location.
2. We have been assured by the buyer at Caltech that the PO's needed
for
the T1 installation at the Hanford site have been processed.
CIT:
1. Fixed a few of the network problems in the 40M. Once again most were
related to loose cables. The Sun box called "gib" needs to be checked
out.
It is having some software problems.
2. Once again the Y2K issue has been brought up. Yes, we do have a potentual
problem. Sun Solaris versions earlier than 2.6 are not Y2K complient.
We are
working on a plan to get the general computing machines upgraded. Other
units
that are being used will have to be checked on a case by case basis.
All of the older PC's probably have a bios problem and some of the
newer ones
may have one. I have requested a copy of the report from JPL when they
are
finished with their study on the Y2K problem.
3. We have been trying to resolve a time-out issue that is taking place
on a
couple of the older PC's running Eudora. So far upgrading the s/w and
ethernet
connection has not helped. Next is a full reload of s/w on the machines.
4. Multiple computer moves have taken place. Mostly machines going to
the
third floor.
5. Barbara finished changes to EPICS CDS system and import documentation.
Sent EPICS CDS application to Hanford.
6. Barbara has the the following for the web site
- installed new Conferences & Workshops page for Dave Shoemaker
- installed new LSC transparencies page
- reformatted Calendars page
- made numerous changes to Livingston web site including new
photos on home page; added damped springs article and photos; made
small
changes to LSC and LRC pages; added more links for Aspen transparencies.
Barbara helped DCC install HP scanner hardware and software.
7. Barbara has started working on Access database for purchase reqs,
work
orders, and check requests for Dot.
8. The continual work of documention and tracking down orders is still
going
on. MS Office 97 copies finally arrived and are being sent to Hanford.
Other
hardware and software items that have been ordered were delayed in
the CIT
system for a length of time but appear to be getting at this time.
9. KB finished up the week filling in while Larry was at the Livingston
site. Gsparc failed on Friday. The standard "turn-key" reset was un-
successful in rebooting the server and a complete powerdown had to
be
performed in order to bring Gsparc back to life.
10. Disk usage on the Sirius partition that had been at the 100% level
last
week was down to 74% and running much smoother. Thanks to all that
helped
to stablize Sirius.
1.4.3.3 Modeling and Data Analysis (KB/SA/HY/AL)
Albert Lazzarini is on travel this week attending the PAC meeting.
This weekly being generated by KB.
Hiro Yamamoto is on travel this week, attending a workshop on
interferometer modeling.
EM finished the performance evaluation of KAI and submitted the results
to Hiro for review. Did cleanup on Alfi to enhance its robustness.
The
entailed mostly added sanity checks. Installed the latest GNU
binutils
and the latest version of egcs (Cygnus version of GCC) on sirius.
KB and AL met with a candidate TCL/TK programmer for the LDAS
system. The candidate had excellent broad programming / system
skills and would make an excellent addition. KB check with two
references for this candidate and they both gave outstanding
comments about his capabilities and performance working on a
distributed database solution similar to the "datawulf" paradigm
occasionally mentioned from time to time. The candidate does
have 3 or 4 other outstanding offers for positions so it is not
known at this time if LIGO stands to gain his expertise.
KB put out the final draft of the GDS/PDR report to the review
board for final approval before circulating for signatures and
forward to the Global Diagnostics System Team. The board was very
pleased with the review and the team should be commended.
As the noise model coordinator for the LSC ASIS group, KB put
together a webpage for that group outlining the current tasks
and priorities associated with standardizing noise models for
that groups effort in astrophysical source identification and
signature(asis).
KB discovered some buggy behavior with the version of Netscape
distributed with Redhat when used with TCL plugins. Upgrading
to the latest netscape and tcl plugin didn't solve the problem.
It appears that netscape was developed with a much older version
of libc.so than what is currently needed by the LINUX OS and its
applications. Going back to the older libc would not be a good
idea so the options are to live with these bugs or try to get
the Netscape source and trace down the problems. It is also
possible to restrict the TCL code to a working set without much
impact.
KB met with TP, AL, RW, WM last friday to continue KB's lectures on
the LDAS software and hardware archetecture in an effort to increase
understanding and make estimates of manpower needs. The dual port
command / data socket model using TCl and C++ class libraries has
received some attention from the IPAC community and there will
probably be cross-pollination meetings with KB in the near future.
KB attended the second meeting of the LSC ASIS group this week in
a tele-conferencing call connecting Caltech, Potsdam, PSU, UMW and
probably others to discuss the status of the group and the original
action items outlined in the first meeting in Hanford several months
ago.
Stuart Anderson's weekly activities consisted mostly of attending the
HPSS workshop at Fermilab which was orgainized to help FNAL make
a decision as to whether to go with HPSS for their RUNII experiments
in
2 years. The problem size and timeline are quite similar to LIGO so
the information will be very helpful in our making an informed decision.
Alignment in E2E (by Biplab Bhawal):
"rotate" (for mirror rotation) and "shift" (for
transversal
shift of beams) subclasses have been included in
the parent
class "align" for doing fast mode calculations using
smart-algebra. Similar subclasses are being included
in
"complex_matrix" class in order to perform mode
calculations
using slow but accurate (upto the mode order considered)
ordinary matrix calculations using almost exact
algebraic
expressions. The latter ones will be used for validation
purposes at any future stage of development or for
doing more
accurate (than what is allowed by fast smart_algebra)
calculations with large misalignments.
Collaborative Research (L. S. Finn, Mohanty, Mukherjee, Romano)
S. Finn: On travel to APS & GWIC Meetings.
S. Mukherjee: Kalman filtering involves a recursive least squared
error method for estimation of a signal distorted in transmission
through a channel and observed in noise. The idea in this project
is
to design a Kalman filter so as to remove the powerlines and violin
modes. I designed a "Plant" that represented narrow band noise. The
state space model (involving amplitude and phase as state vectors)
being non-linear, I used Extended Kalman Filter algorithm into my
design. As a preliminary step, I started off by using gaussian
white
noise models for both process noise as well as measurement noise. I
could qualitatively produce the graphs showing how the amplitude and
phase were being tracked. However, it worked only for a rather limited
range of noise variances (small values) and proved to be a bad choice
when noise was large when it failed to produce the characteristics
of
narrowband noise as one would encounter after isolation of powerlines
and violin modes in the power spectrum of the interferometer data.
Hence, I am in the process of experimenting with implementation of
colored noise models. I expect that the variation in the amplitude
modulation will be much slower and thus will reflect the characteristics
of powerlines/ violin modes more closely. Following this implementation,
I shall use data from the 40-meter to demonstrate the process.
I am
working on the algorithm of including colored noise in my Kalman filter
model in matlab environment. The key idea in the algorithm is
to make
the system equation white by a series of transformations.
S. Mohanty: I have confirmed that the essential idea of the modular
scheme for SEI/SUS works in principle. I considered the case of a
simple pendulum with the transverse modes of the string included. The
motion of the string was solved under the boundary condition that the
transverse force exerted by the string on the bob was some function
R(t).
The bob's motion is also governed by R(t) and an external force. By
equating the acceleration of the string at the attachement point to
the
bob and the bob's acceleration, one can solve for R(t) algebraically
in
the Laplace domain. The solution requires a knowledge of only the Green's
function for the string under the above kind of boundary condition
(homogenous). I have also shown how the scheme works when one connects
a
set of pendulums in series. Thus, one essentially needs to know the
Green's
function for each element in the stack and all the action-reaction
forces
can, in principle, be solved for algebraically in terms of all the
external
forces. I am now embarking on a program to catalogue the Green's
functions for all elements. Each element would have a series of Green's
functions associated with it. Succesive Green's functions will include
progressively more of the internal degrees of freedom of the element.
I
will start with the pendulum wires at first and include now the
longitudinal degree of freedom along with the transverse. This will
result in a 2 x 2 matrix of Green's functions. One can then include
the
case where the transverse motion is not confined to a single plane
along
the length of the string and this will bring in the torsional stress
force.
As long as the system is a linear elastic element, this scheme should
work
in principle. I will also simultaneously investigate how well this
theory
can be implemented numerically. I am also writing up the first
draft of
the paper dealing with a statistical method of testing for association
between GRBs and binary inspirals. This work has been done within our
group. I have also been occupied with preparing my Ph.D. defense
seminar
in which connection I will be in India from the 30th of April to the
13th
of May.
J. Romano: No report received
Date: Thu, 23 Apr 1998 14:36:27 -0700
From: Elizabeth Wood <ewood@ligo.caltech.edu>
Updated the LIGO roster on the web. Took lessons from Barbara
Kratochwill on
making the page work satisfactorily.
Met with Ed Jasnow and Miriam Beltran del Rio at HR to get an update
on LIGO
hires and learn more about Caltech hiring process. I have now
got a current
list of pending LIGO jobs in an Excel file.
Met with Bill Tyler and Marty Garcia to discuss the LIGO site incoming
employee
checklist and employee termination clearance sheets.
For I. Petrac did edits to Specialty Components PC266884 and Procurement
Justification for same. Did change order No. 2 for Allied Engineering
and
associated letter to the NSF. Did change order No. 6 to Research
Electro-Optics.
For E. Jasnow did an additional FedEx for IFB EJ-293 for Supply of Liquid
Nitrogen to LA site.
With W. Tyler, did laser labels associated with safety areas.
Distributed: Draft Monthly Report for end of February 1998, CCB meeting
minutes of 4/13/98, a manuscript for the Science Group.
Performed miscellaneous duties as requested by various members of the
LIGO
Project here at Caltech as well as members of the staff of each of
the two (2)
sites. Assisted Elizabeth Wood wherever possible during her second
week with
LIGO.
Prepared and distributed the Weekly Travel/Vacation Itinerary Report
for LIGO
Staff and Visitors.
Processed Hourly Payroll, incorporating various recent changes, new
hires
and the processing of Vacation/Sick Leave accounting.
General Items:
--------------
Hugh Radkins joined the LHO staff on Monday, 4/20, as an operations
specialist. Hugh formerly worked for Rogers Surveying and measured
the
locations of the vacuum equipment at the LHO. Initially, his
primary
responsibility will be with the BSC SEI first article test being conducted
by Hytec in Los Alamos.
This has turned out to be public outreach week and some are wondering
if
Fred Raab planned it this way (since he is on travel this week!).
R.
Savage visited Southridge High School on Monday to discuss LIGO with
two
Engineering Technology classes. The class is very knowledgeable
about
LIGO. They have a set of LIGO architectural drawings and have
built
several models of the facilities in order to complete their class project
which is to devise schemes to solve LHO's tumbleweed problems.
The
presentations will be this Thursday and we are considering inviting
them to
the site to present the most promising solutions.
On Tuesday, J. Worden and R. Savage participated in the science fair
at a
local Elementary school by spending and hour or two evaluating their
projects.
Today, we C. Patton, D. Cook and R. Savage are hosting two tours related
to
the national "take our daughters to work day" activities.
Tomorrow, a reporter from a Spokane newspaper will visit the site to
gather
information for an article he is writing regarding LIGO.
Laboratory Preparations:
------------------------
(D. Cook)
The Optics and Vacuum Prep. Labs will under go a complete wipe down
of
walls and floors 4\23. We will be setting up a particle counter with
a
printer to monitor the cleanliness
Orders have been placed for lab equipment and optical components and
supplies for the Optics and Vacuum Prep Labs.
TMC should be delivering the optic tables for the Optic Lab on 4\28.
The laser safety sign, will be installed shortly. Also the safety curtains
and barriers are on their way and will be installed in about 2 weeks.
As
soon as we have the safety procedures in place we will be setting up
D.
Sigg's 980nM calibration laser.
The casework installation for the labs is scheduled for 5\23.
Beam Tube Bake Out:
-------------------
(M. Lubinski, M. Guenther, K. Stiff, W. Althouse)
This week's input is being assembled by Bill Althouse while Mark
Lubinski travels to Oak Ridge TN to witness the acceptance testing
of
our Calibration Gas Assembly.
1. Electrical Support Services subcontract:
Meetings were held with representatives of the four contractors who
submitted proposals to clarify the technical content of their
proposals. The Proposal Evaluation Team will submit their report and
recommendation to Gary Sanders this week.
2. Power system components:
Most components are now on site: the DC power supplies, DC power supply
cooling water systems, DC supply and return cable, stainless steel
cable-tube connector parts, AC power transformers, and 8 of 18 portable
panelboard assemblies (containing the circuit breakers and outlets).
The remaining panelboards will be delivered after the supplier replaces
one undersized outlet on each unit, due to a error in our drawing.
3. Heater blankets and heater blanket controllers:
Except for a few minor shortages, all blankets, controllers and
connecting cords have arrived on site.
4. Cryopumps:
The first cryopump was received on site last week for fit tests with
the pump mounting stand. The remaining units will be shipped over the
next two weeks. The prototype pumping stand will be available for
fit checks by middle of next week.
5. RGA measurement systems:
Acceptance testing of the RGA measurement systems will take place in
Albuquerque NM on 5/7 and 5/8. M. Lubinski and R. Weiss will represent
LIGO. As mentioned above, the Calibration Gas Assembly is undergoing
acceptance testing this week at the supplier's facility in Oak Ridge
TN,
with M. Lubinski representing LIGO.
6. Data acquisition and temperature control system:
The data system is being assembled in-house at LHO. Four of 23 I/O
boxes are complete, and most parts are on hand for assembling the
remaining boxes. Software development was put aside temporarily to
push the assembly task forward, and should resume this week.
HAM SEI First Article Test:
---------------------------
(C. Gray, H. Radkins, R. Savage, F. Asiri)
C. Gray and H. Radkins are on travel to Hytec in Los Alamos this week
to
participate in the first execution of the alignment procedure for the
BSC
external hardware. This procedure is very similar to that for
the HAM
chamber and H. Radkins surveying expertise is expected to be valuable
to
Hytec.
Phase 1 fixtures finally arrived, six days late. What was supposed
to be
overnight delivery from Los Alamos turned out to be one week delivery.
Hytec has been notified of the problem for billing and future deliveries.
The delay in receiving the fixtures has caused a delay in installing
the
piers and cross beams. We will attempt to regain the schedule
next week.
We have identified a temporary employed who will assist with the first
article testing. David Hall, will start work on 4/27.
For additional information about this report, contact sanders@ligo.caltech.edu