Replaced Y end instrument air compressor.  System restored.

K. Arai, J. Kissel

Combined Watchdog state of the QUAD M0/R0 stage has been made.

EPICS version of this signal is named like "H2:SUS-ITMY_M0R0_WDMON_STATE"
The simlulink model has the tap for the faster trigger, but not used for anyting right now.
The state signals are produced from the watchdog "blocking" signal of M0 adn R0 by taking "OR" logic of them.

This channel is designated to provide the state of the Quad suspension to ISI.
From the point of view of the suspension safety, ISI should be notified if the suspension top levels are not quiet and thus the active damping is not effective. The suspensions are enough quiet as long as the M0/R0 damping are functioningd. In that case, the L1/L2 watchdogs may trip with different reasons than the disturbance of the entire suspension, and therefore should not be included in the state notification for ISI.

K. Arai, J. Kissel

Implementing AC/DC watchdog for Quad/Triple SUS

AD/DC watchdogs have been implemented for Quad/Triple suspensions. The snapshot of one of the MEDM screens is attached.

Those watchdogs have different signal processing chains and thus have different purposes:

- DC watchdog monitors the positions of the OSEM flags and interrupt the actuation of that suspension level if any of the sensor signal hit the high or low thresholds.
- AC watchdog monitors the RMS values of certain signals and interrupt the actuation of that suspension level if the RMS reaches the threshold level.

The signals being monitored (i.e. OSEM sensor signals, OPLEV sensor signals, Coil outputs, etc) are individually processed by the filters called "band limiting filters". The AC watchdog employs the RMS module to obtain the RMS value of the signal. This RMS block has the time constant of ~7sec (See this entry). Then the output of the bandlim filters or those of the RMS blocks are compared with the thresholds.

Bandlim filters: For the DC one, this filter cleans up the sensor signals by attenuating at the high frequency (e.g. f>~10Hz) band where the sensor noise dominates the sensor output.  For the AC one, the filter usually employs "AC coupling" as we may not want to include the huge DC value of the OSEM output in the RMS calculation. One possible configuration for the OSEMs is to calculate the velocity of the signal by differentiating the OSEM signals (i.e. to multiply (2 pi f)). Again the high frequency components are to be attenuatedfor the same reason as the DC case.

Currently the bandlim filters are mostly empty (= do nothing). They are to be filled by the preparations scripts with easyquack.

B. Bland, J. Garcia, J. Kissel, T. Sadecki

Using 3 of the 199" D1000225 that landed at LHO, we've connected up the TOP stages (M0, R0) of H2SUSITMY for the first time since mating, the satellite amplifier swap, and a whole ton of infrastructure changes (most notably the watchdog -- see subsequent eLOG by Koji).

All OSEMs appear functional. Because of the gain change in the satellite amplifier gain change, we had to remeasure the open light current (OLC) of the PDs using the ADC. At first glance, all OSEMs show counts *under* the 32768. Will post details later. We then record OLC, and installed the appropriate offset using
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H2/ITMY/Common/MatlabTools/getWhiteCounts.m 

After then re-engaging the OSEMs back to half light, we freed up the suspension. 

After running
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H2/ITMY/Common/Scripts/prepare_H2SUSITMY_20110819.m
which restored a few incorrect MEDM values, and easyquacking in bandlimiting filters to the AC coupled OSEM wathcdogs, we were able to get damping loops running.

Rich is taking a long high-frequency measurement of the now free ISI overnight (of which I've sat through watching the QUAD for a few hours now), and there appears to be no obvious effects on the QUAD (makes sense -- > 100 Hz measurment, at least 1 stage of passive isolation in between, suspension works!).

Will post more details later. Struggling to commission the BSFM01 at the same time; running out of time to write aLOGs. 

   The ITMY ISI is now floating with the Quad on the optics table. The mass on the keel is now 2 stack masses, one large, one small ('820lbs), and 12 keel ballast masses, which I think

are 40lbs each, so that would be 480lbs.

  there isn't currently a lot of trim mass on the walls

  the pictures that I included are of the mass on the keel plate and the wall mass in each corner

More work on setting up wall panels, building pipe chases for conduits. The diode room clean room has been set on its vibration isolators.

Dust counts for this week are attached, everything looks normal.

Pumped to rough vacuum the annulus volumes of HAM1,2 and 3 yesterday.  

Today I roughed down HAM4,5 and 6 annulus volumes.  Later, I continued pumping these using hung turbos (backed with aux. pump carts).

Turned on annulus ion pump controllers for HAM4,5 and 6.

Opened GV1 gate annulus volume to remaining GV1 annulus volumes such that all of GV1 annulus volumes are actively pumped by a hung turbo (backed by aux. pump cart).  



Operators: 

Expect and ignore annulus ion pump alarms for HAM1,2,3,4,5 and 6 over the next few days.    

HEPI installation at end Y
Praxair
Work on portable building
In chamber cleaning in BSC8

.5 micron particle counts attached

(Corey, Eric, Jim)

BSCISI#1

Jim & Eric aligned and set gaps for the newly-installed Capacitive Position Sensors.

BSCISI#3

Completed our final subassembly:  Small Actuators are DONE

Staged and gathered hardware for other tasks (such as GS13, Rib, Gusset, Keel Installation).

Tuesday afternoon about 1500 PDT the 20A circuit that powers both seismic and suspension test stands tripped.  It appears that extra equipment had been plugged in to the circuit, overloading it.

The suspension test stand was powered up and the x1iop model was restarted.  The bscteststand computer (the old test stand) was left powered off to conserve power.  The NFS mount on the workstation (suswork1) for /bscteststand was removed.  If users find they need data from the old controls account on bscteststand, this can be restored, contact me.  

The seismic test stand computer was left powered down until it is needed.  

The iMac for the suspension test stand was configured to allow the medm, dataviewer, and diaggui tool bar icons to function for the cleanroom user account.

J. Bartlett, V. Brocato, J. Kissel

After restoring the functionality of the SUS BSC Test Stand, Jeff and Virginia installed new Flat Flags D1100573 on BSFM01 in the staging building, and then installed and aligned the already-cabled up OSEMs. We then centered the M1 flags both in the sensitive axis ("In and Out", to a 15k count offset) and together we ran through an OSEM diagonalization to align the flags perpendicular to the sensitive axis (using those pesky CAM Nuts). Though the M2 stage OSEMs were centered along the sensitive axis (again assuming 15k offset), we did not attempt to do any better perpendicular alignment than by eye.

OSEM diagonalization templates for a Test Stand BSFM live in 
/ligo/svncommon/SusSVN/sus/trunk/BSFM/X1/Common/dtt_templates/BSFM_OSEMDiagonalization_*.xml

Just because -- I took a high resolution version of the same thing, when the suspension has settled nicely for an evening, and is wrapped up in a C3 shroud, to see how good we can do. See attached .pdfs. As we have seen in the past F1 is the worst offender at about 10 - 15dB isolation from the drive degree of freedom when driving in both Vertical and Yaw (and it should not be sensitive to either). Other OSEMs (coherently) show 30 dB of isolation or greater, which is expected.
 

V. Brocato, J. Garcia, J. Kissel, A. Ramirez, R. Mittleman

We've finally received a load of Class A in-vacuum peek cables from Caltech (ICS Shipment-1998), in which were several lengths of Seismically-Responsible Suspension Cables (SRSCs), D1000225's. Suspensions had been waiting on these since the mate, such that we might have sufficient cable length to connect up the H2SUSITMY QUAD appropriately through the isolation stages of the BSC-ISI, as per the System's drawing D1101477. 

Upon receiving them, Virginia inventoried what was shipped (Drawing and Serial Numbers, see attached's first and second column) because we were informed that what was in ICS was not complete -- which has been confirmed. After identifying that we had a significant number of the needed D1000225s, we went though them to identify their lengths (see third column). D1101477 suggests that we need the 180" length for ITMY and 199" lengths for the FMY, but (as confirmed by Kate Gushwa at Caltech) there were none of the 180" lengths in this load. We did find six of 199" length.

Hoping to press forward, Jeff, Rich, and I began by re-arranging / de-tangling the cables that were coming off of the QUAD, and then assessed what we were missing in order to continue. We didn't get very far. After using the site-aside-because-they're-not-needed UIM Stop Plates as temporary optical table cable clamps, and merely draping the D1000225s over the ISI, we came up with the following list:

- Allen key for removing gender benders
- Cable Brackets (D1001346) and associated hardware
- Cable Clamps (peek / viton / metal / otherwise) and associated hardware
- Aluminum cable labels (made by G2 earlier in the week)
- Cross brace cable clamp hardware and instructions on how to use them
- Class B fake feedthrough
- 3/8-16 and 1/4-20 bolts of varying lengths

Also, upon reviewing / actually trying to implement the cable path up the BSC-ISI defined in D1101477, we noticed that the launch and land of the cables from Optical Table/Stage 2 to Stage 1 happens rather quickly. I think perhaps there is some confusion as to what is Stage 2 and what is Stage 1 (which is admittedly confusing with the nested structure of the BSC=ISI). First impressions from Rich and I would have guessed that the cable should make the transition from the optical table to running up the side of Stage 2, before making the important jump between isolation stages. As it is shown now, there is lots of slack on the cable, and the probability for rubbing / mechanical shorts are high. Further, though the D1101477 doesn't show it, that area is already crowded with BSC-ISI cables, making routing more difficult than what is shown in the SolidWorks rendering. 

Pictures attached!

K. Arai

H2 CDS freezed at around 9pm and any of the epics channels are currently white.
It seems to be a spontaneous crash as no one was working on the realtime codes itself.

We await for the restoration action by the experts for an hour and leave the site if not avilable.

Dome is back on--Jimw GregG Scott Slim MarkD Hugh

We dropped the iLIGO Support Table into the chamber and it landed (in a very controlled way) onto the Support Tubes.  We bolted the Table to the Tubes to fix the Support Tubes' relative position.  We balanced the position of the Support Tubes wrt the Chamber and then secured them to the Crossbeam via the V-Blocks.  We then disconnected the Table from the Tubes and pulled it from the Chamber.  It was a little trapped between the Support Tubes suggesting we hadn't been as iterative in the torquing of the V-Blocks to the Crossbeam as we should have been.  We tweaked the a V-Block outward and the Table slipped out.

We wrapped up the day by replacing the Dome and the East Door Cover after we emptied the chamber of our detritus.

Some photo of the day: 1) The Jib Cranes holding the Support Tubes-there is one of these at each of the four corners.  2) The Support Table flying toward the Chamber.  3) The Support Table bolted to the Support Tubes.  4) GG hoping to not be forgotten!

Thanks Crew, good job!

Usual deliveries in the morning:
Praxair 
Unifirst
Paradise water 
Swageloc delivery and rental pick-up

Activities:
Patrick to take dust monitors to  End-Y 
In-chamber cleaning in BSC8 – finished just before 4pm.
Seismic work at End-Y station

Had issues with the signal input selection monitor bits for the PUM. A test bit controls where the drive signal for each channel comes from. The PUM has two DB9 connectors, "DRIVE IN" or "TEST IN". See Jeff Kissel Alog - QUAD BIO I/O Simulink/MEDM Upgrade for further details.

This test bit controls a relay that selects from "DRIVE IN" or "TEST IN". Attached to this circuit are two transistors that output the state of the relay. When the relay was activated, it would respond by switching. The problem came from the rest of the circuit, where the input voltage on this bit was around 0.8V. This was enough voltage to keep the base of the transistor "on" regardless of the state. Jay Heefner recommended we switched out R111 on all four channels from 10K to 100K. Did modifications on PUM Chassis SN S102650. Unit is back in SUS rack and monitor channels are all working.

F. Clara, J. Heefner, R. McCarthy 

Used aux. pump cart to "hog" out HAM1, HAM2 and HAM3 annulus volumes -> no change in vertex pressure -> will continue hunt tomorrow

The Viton vibrational absorbers (VA's) were added to the sleeve of the mated Quad in the LVEA last Friday.  The VA's were clamped to each of the four posts of the sleeve of the Quad in a "spiral" configuration which means they were stepped up incrementally around the Quad. An accelerometer was inserted into each VA and tap tested using a B&K hammer.  The hammer's software plotted each impulse response and confirmed the hammer had not "double-hit" the surface.  

First, each VA was tapped individually parallel and perpendicular to the orientation of the accelerometer in the VA.  Each attached "vibration_absorber_##" pdf file has the parallel response on the first page and the perpendicular on the second.  The "##" corresponds to the S/N of the VA. Here we simply have images of the plots for analysis.

Next, 3 locations on the Upper Structure, 4 locations on the Lower Structure, and 4 locations on the Sleeve Structure were chosen for tap testing.  The impulse responses are plotted along with a picture showing their locations on the assembly.  The last image is a close-up of one of the VA's.

Each plot has each of the X,Y, and Z DoF responses of the accelerometer.  Exporting the data into text files was discovered after these tests were ran so we would not have to rely on images of the responses. The ability to process the data via MATLAB is currently in development. 

Mark, Scott, Chris, and Carolyn worked out at the chamber today. Wipe down with isopropanol was completed and all of Rai's requested samples were taken. The floor was re-installed so that 2nd vacuum could begin early tomorrow.

Zack worked on air drill dis-assembly. Some of the tools for the dedicated clean assembly space arrived today.

Mark H. and I talked about safety concerns related to my "walk" down the beamtube to survey fiber content in the low spots. We agreed that I would only go a short distance down the tube (max. 5 ft) and that Safety will work on a Hazard Analysis for longer beamtube "walk-abouts".