Hugh, Jim, Corey, Hugo

Spectra for the GS13s and the CPSs were taken on the ISI in locked state.

• Spectra of GS13s don't drop in low frequency (good)
• CPSs react to insertions of shims in their gaps
• Responses are similar from one corner to another for both types of instruments

A procedure and a report are being gathered for this phase of testing.

Today, we started to work on HEPI-BSC6. Some basic tests were performed:

- Spectra: Sensors look good
- Static Test (Actuators are working). We swapped Actuator cables (Pier 2 <=> Pier 4). The cable labels have not been changed. Will be done tomorrow.
- Range of motion (range of +/-0.8mm). Stops were initially touching the boots in the horizontal direction (negative drive) in corner 1 and 3.
- Linearity test (Linearity + stops): Ok

Transfer functions will be measured on Wednesday.

(Betsy, Travis)
After Richard/Filiberto fixed the broken ITMy L2 OSEM signal (swapping a board), and we confirmed that actuation was evident on the appropriate channels, we went in and finished the last items in BSC8:

- Set M0 and R0 Left and Right Top Stage BOSEMs, and M0 PUM and EMTy barrel EQ stops, to account for buoyancy.
- Took photos.
- Removed all tools, stools and did once-over on chamber "cubbies" looking for hidden treasures.
- N2 blowoff of optics (still see surface particulate on surfaces of the 10-20 particles/sq. in. level. Blowing did little to reduce this number. Hmmph. (Note, the FC had been removed early last week and the optic surfaces have been exposed since while unexpected diagnostics took place the last few days.)
-Set witness plates.

We're hoping Garcia can collect a final L2 TF set in the morning, but we see no reason not to shut the door to this chamber.

PSL installation team

- This morning we turned the Laser off to perform some tests on the xtal water circuit. The goal was to get rid of some mechanical vibrations, which are caused by this loop, by adding a special damper. The data are still under investigation.

- We made some progress in the alignment of the optical path: The path to the FSS is partly set and the FSS AOM as aligned in single-pass. 

- The water hose, which is connected to the xtal chiller, suddenly burst, which triggered the laser interlock. It seems that the flow/pressure, provided by this chiller was too high (we already saw the bulging hoses before). The flow is now decreased by the chiller's bypass valve from 20.5 lpm to 18 lpm (same as in H2 setup). Therefore, the flow rates at the water manifold had to be reset.

Again, no issues to report.  ISI extracted with about the usual pulling & pushing and was broken down on the LVEA floor.  The Apollo crew worked quickly and the parts are now nearly outside awaiting the recycle bin.

Thanks Caleb, Zack, Scott with assistance from Mick, Ed, Mark and Chris

This is a follow up of this alog entry I promised and forgot to write.

Current status:

The first segment of IR QPD 2 is short-circuited (alog by Filiberto, though the entry doesn't say "short circuit") (D1002283 to see which pin is which) and the ADC for this segment is railed at -32k counts.

Using flood light on the floor as the light source, Dan Hoak confirmed that QPD 2 is the one closer to the ETM (see attached picture), as it's supposed to be.

Though this is another story, actually QPD2 signals appear in QPD A channels in digital world, which doesn't make sense. I've confirmed that QPD A takes channels 0 to 3 and QPD B 4 to 7 on ADC0, so this is not a model issue. Probably DB9 part of DB25 to 2xDB9 interface cable for QPDs (D1101801) were swapped in the trans impedance amplifier box (D1002481), and I asked Richard to have somebody look at it.

How it happened:

Three of four in-vacuum ISC cables were connected to wrong feedthroughs (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=2561) though people didn't realize that it's all wong: IR QPD cable to picomotor port, picomotor cable to beam diverter port, and beam diverter cable to IR QPD port. The only correct one was green QPD.

If you payed attention to the above alog, it would have been obvious (see D1003085, flange layout diagram). Unfortunately I was out of town on vacation, read the alog but didn't check, and when I was back I totally forgot. Shame on me.

In-air cabling was done "correctly".

On May/08/2012 we attempted to move one of the picomotors, and high voltage from the picomotor driver hit the QPD.

What will happen:

It will stay for the H2 one arm test, and we'll fix it when we move TMS to H1.

aLIGO integration issue tracker system is perfect for remembering this kind of stuff. This specific issue is found here: https://services.ligo-wa.caltech.edu/integrationissues/show_bug.cgi?id=1

Other thoughs:

Always laminate flange layout diagrams (like D1003085) and cable routing diagrams (like D1101478), wipe and bring them in chamber when making in-chamber connections.

It would be nice if the flange numbers (FC1, FC2 etc.) and the subflange numbers (1C2, 3C1 etc.) are stamped or scribed somewhere in chamber.

But the most important thing is, don't forget to check things. Have more than one person check this.

It looks like we had a bad DAC channel in the IO chassis.  Jef G noticed we were unable to drive L2 UL coil.  Filiberto and I went out and traced it to the DAC card.  We swapped the DAC card and the channels are now working.  Will do follow up testing on the bad Card to see if it was something simple.

r

Cleaned out old data from /frames directory to get DAQ process to continue to run, restart x1isihamx and x1iopseibsc6 models to correct timing issues.

We confirmed physically the readbacks of the position sensors were in the correct arrangement but the corner2 & corner4 Actuator drives are reversed.  Vincent will look through the model to find the issue.

Jim, Vincent, Hugh

I prepared FTIR and tape sampling material and went into BSC1 via HAM4->BSC2. I took two FTIR samples (S1-upper left, to JPL, S2-upper right, to Alltia) and one tape sample (lower left) from the elliptical baffle. Next, I removed OSEMs and the elliptical baffle. The OSEMS are in a foil envelope in the staging cleanroom and the elliptical baffle and tape sample are in the OSB Optics lab on a flow bench with the BSC3 EB and the tape sample.

Mark L. and Chris H. got dust barriers ready and started installing them as soon as I got out. They will block off BSC1, BSC3, and HAM3. They are now on a hunt for the 4th solid dust barrier so that we can close off the new output mode cleaner tube. 

Mark D., Slim, Mick, Eddie, and Scott started removing view ports, etc from the HAM4 south door and staging for dome removal. They will continue working toward SEI stack de-install this afternoon.

For the record, Richard is out on the floor looking into it.

The test models were removed and the PSL models are now being run on h1psl0 (ISS, FSS, PMC and DBB).

The three video network cables were connected to the following video sources:

Ceiling cam in Ante Room (h1pslcam0)
Ceiling cam in Laser Room (h2pslcam1)
Video server (4 channels of analog video) (h1pslvid0)

The camera images are being displayed on the PSL monitor in the control room. These cameras support the "controls" account.

This is an old news, I thought that I made and entry but I didn't. Four vent washers that were stuck on the TMS cage structure were all removed.

At first we thought we'd leave them in place as we were afraid of flipping washers, and a gentle touch using our fingers didn't do anything.

This time, we stuck a long bolt in the hole to prevent us from flipping them, and used a clean plier, and that did the trick.

The "nds0" server appears to be offline. The CDS overview screen displays a white box for it's status. The "nds1" server appears to be functioning and online.

TMS alignment looks very good (despite ugly beam), and I think we're done with the in-chamber work.

We noticed that the pointing to the QPDs were off after last week's alignment process, and touched up the injection path on ALS table a bit.

After that, we used the first green picomotor to center the beam on the first folding mirror (bigger of the two folding mirrors) on the telescope because it looked off, and this made the centering on the secondary great. Retro reflection is very good.

Dichroics don't seem to be perfect, as witnessed by the existence of green beam in the red QPD path. A small fraction of green retro reflection is reflected off of the red pico mirror. This green beam is not centered in the red QPD path, and not hitting red QPDs. This might be due to the wedge in the splitter and ETM combined with the dispersion, but we don't know for sure. Though we have picos for red QPD path, and though we don't use red QPDs for the one arm test, we'll make some calculation so we'll know in the future installations if this green beam can be used for the alignment of the red QPD path.

We've done some close-up work like centering the OSEMs, checking apparent touching (there was none) and checking cables rubbing each other (there were subtle ones, which were fixed but not completely).

We took many pictures which will be posted to resource space by Alberto and Dan.

Szymon Steplewski, Jeff Garcia, Mark Barton, Fred Raab

This afternoon we tested the ITMY lower stages to check whether the OSEM actuators were working correctly.  We found that upon exciting stage L2 the UL OSEM was not registering any change in the voltage monitor H2:SUS-ITMY_L2_VOLTMON_UL_MON, while the other three seemed to be responding to our excitation.  The corresponding NOISEMON channels also indicated that the UL OSEM was acting differently from the other three.

We decided to try injecting a 1 Hz sine wave excitation and looking at the time series of the VOLTMON and FASTIMON channels.  Our test confirms that each OSEM is responding correctly to this monochromatic drive, except for the stage L2 UL OSEM.  We will next diagnose whether this is a hardware or software related problem.