[HAM3 In-chamber work from 11:30am-1:15pm]

After staking out ISI Corner3 Cabling work on Thursday, I went about dressing the Corner 3 GS13 pigtail cable, one of the more important to dress since these are the only ISI cables which come from the suspended Stage1 to Stage0 (we have to be careful there are no seismic shorts).   So between Stage 1 & 0, the cable must be dressed just right--not too tight, and not too loose.  Between Stages, you also have to elimate any sort of rubbing.  Basically you have to have a good eye's view and be very precise with clamping these cables. 

This is hard for Corner3 on HAM2 & HAM3.

So, in to Chamber and on top of the table I went.  To minimize head rushes/passing out, and gettingoverly overheated, I slowly did work in small steps (either upside down, or by keeping head level with torso and reaching down to the breadboard area).  I removed all other ISI cables from the tiny breadboard we had.  I then dressed the H3 & V3 GS13 cables to their own clamp on Stage0.  I did this such that each cable had a nice & clean "S" run between stages.  After that I installed the Grounding Bracket (with Extension cable bolted on) on the breadboard.  And I finally connected the pigtail cable to the Bracket. 

During this work, I managed to drop an allen wrench, and it fell below the ISI and landed directly in the center of the HAM Chamber.  Funnily, it wasn't easy to get to the tool!  I ended up performing endoscopic surgery and used a clean cable to pull out the tool.  Note:  this work yielded a "white glove" test in that afterward, my glove ended up getting fairly filthy after rubbing up against the Chamber floor (see attached dirty glove).

So, the GS13 cables are dressed for Corner3 (see attached photos & video).

As for other cables....

For the H3 CPS & Actuator, I'd say we bypass the tiny breadboard, and pull these cables straight down off of Stage0 & then take them to the Center flange (D2).  For the V3 CPS & Actuator, I'd also try to avoid the center breadboard (because it's just hard to do work in there) and go straight to the flange.

Check ResourceSpace for views of PR3 coming out of the can and MC2 receiving the optic.  Both activities occurred on 7/12/12.

Aligned the cavity using tdsdither @ 19:20.

Left the cavity locked w/o VCO offloading servo to ETMY so we can make a (somewhat) longer term comparison of the ETM angle with (yesterday) and without (tonight) the length drive.

Also QPD servo was disabled so we can see how good or bad the alignment is going to be without active pointing servo.

ETMY L1 damp filters are on (as usual only for L and P).

Attached is a trend of cavity length drift from the yesterday.

The first lock stretch is a 3-hours one that I mentioned in https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=3517. The second lock stretch lasted until this morning.

CH2 is the output of the ETMY M0 lock filter. Using 0.48nm/ct calibration, it seems as if the length drift for both of the stretches was about 110 um. You should be able to stitch these two together, so it is something like 220 um over 16 hours period. This could be tidal.

I don't know if our tidal prediction software still works, wiki page says it doesn't work on Linux workstations.

CH3 and CH4 are the output of ETMY oplev. I think these were calibrated by Thomas, but I couldn't find any alog about that, so for now it is uncalibrated.

CH5 is the reflected power which mimics the transmitted power.

Attached are plots of dust counts > .5 microns in particles per cubic foot.

• Bubba working at EY
• Vacuuming in the OSB optics lab at 11:14AM
• Filiberto inventoring in electronics room
• Kyle/Gerardo changing gasket at HAM5
• Elli at EY working on optics table
• Eric working at HAM3/4
• Jim, Mitchell, Greg working at HAM2

Found x1tripleteststand had time frozen at Wednesday evening (July 18).  Could not get models to run, even after restarting the tripleteststand computer and cycling power with the I/O chassis power switch.  Appeared the DAC and ADC cards could not be found.

Ended up turning off power to computer, then turning off power supply to I/O chassis, then powering back up in order.  Started IOP model, then user model, both started properly.

Given the timing, possibly a lightning induced power glitch?  

GregG, JimW

The HAM2 ISI is now floating on HEPI. Well, not now, 'cause we lightly re-engaged earthquake stops, but it is currently mostly supported by the springs. We haven't done a level or height check yet, as I don't know where our references are or what height we need to look for, but we are basically ready to start working with IAS on figuring out where we need to move to. Should be able to hammer that out next week.

This afternoon, I:

- ran and committed to svn, TFs of all 6 DOFs of the glass MC2 chamberside, with the damping loops ON.

- performed svn commit on the exports I did of the 2012-07-20 TFs taken earlier of the all metal MC2, which also required renaming with arbitrary time as the form was incorrect for matlab.

- added all 3 sets of the latest data to the plotallhsts_tfs.m file and committed

Plot comparisons to come.

After restoring the Beckhoff system we could not relock the PLL in the end-station.

I turned out the the laser in the optics lab (corner station) was on stand-by, indicating that the 'door' wasn't shut on-time or something similar.

I tickled the laser temperature to find the 00-mode and all is running again.

The PLL in the end-station is running smoothly.

Calibrated ETMY M0 OSEM drive, plus calibration of M0/L1/L2 OSEM sensing, by injecting 0.1Hz drive to M0 while the cavity is locked without low frequency offloading from VCO to ETMY. M0 damping was on but L1 damping was off.

Length drive calibration for M0 stage is 0.48nm/cts, not 1nm/cts.

M0 and L2 OSEM sensing calibration is in a ballpark. According to Stuart JeffK, it should be 38 nm/cts.

L1 OSEM sensing calibration is off by a factor of 10. I checked digital gains but they look OK to me. JeffK called me to tell that Matt put a factor of 10 in SENSALIGN matrix for L which I forgot.

If SENSALIGN matrix element for L were 1, L1 DAMP_L_IN1 calibration would be 32 nm/cts.

The LVEA and OSB chilled water pump was inadvertantly tripped off while attempting some adjustments. The Chiller and water pump were off from about 11:26 local time to 11:35.

The system appears to be back to normal and we have switched to Chiller 3 rather than Chiller 1. Water flow is up from 45hz to 60hz (variable speed pump) We have increased the water flow to help deal with

the summer temperatures.

(corey, greg, jim, mitch) [Work from Thursday]

:::  LHO Sauna, aka Hot Yoga Studio, aka Staging Building :::

Cleanroom Weather:  A balmy 80degF ... (with a 95degF Cleanroom-suit-Factor) ... [& 100degF garbed-Corey-Factor]

Today, we quickly and efficiently moved a BSC Stage-0 Bottom Pate into the Staging Building and placed it on the granite table for prep work.  This marks our return to BSC-ISI assembly work after many month hiatus.

(corey, mitch)   [this is work for Thursday]

Yesterday, we continued with installation/dressing of cables for SEI/ISC/SUS.  Mitch completed installation of the non-SEI cables.  I pinned out some Actuator cables for installation (installed one of them on H1 & still need to install the H2).  I installed the GS13 Grounding Cable Bracket for Corner2. 

As for Corner3....ah, Corner3. 

Ideally, it would have been preferred to have installed the Cable Bracket and dressed the SEI cables before insertion of the HAM-ISI in the chamber, but we didn't have the Bracket parts, so we are installing after the fact.  Corner-3 is basically entirely in the center of the Chamber.  Access to it was not a problem in HAM2 (since one could climb into the chamber and work on your belly as you dressed cables & installed the bracket.   But for HAM3, there is the Septum on the north of the chamber, and so this preferred space isn't useful (I tried, but I would need to shrink a factor of 4 to be useful here).

Another option was to lay on the table and then hang of the side--UPSIDE DOWN! (my Picasso-esque yoga pose [where gravitational force points down] is attached, yes that's my head at the bottom...I was resting on my left shoulder.  And could only stay like this for a couple of minutes until it felt like my head was going to explode). 

Since we needed to cleanly dress the GS13 cables from Stage1-to-Stage-0, I unclamped cables on the breadboard here to have a clean slate, and would like to now start dressing cables and then install the GS13 Grounding Cable Bracket (easier said than done).  Will try the upsided down technique, or we will see if Jim can somehow squeeze in from the side.

Note For Future:  

• Dress & install these cables/Cable Brackets BEFORE installation
• Or, hire elves

(unknown author using Matt's alog account)

This is a (sort of) follow-up of https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=3508.

In the attached, you'll see the calibrated spectrum of this morning (red), last evening at about 9PM (blue), last evening at about 4PM (green, the same one as what Matt posted), and some old reference (brown).

There are several things to note:

1. New 0.7Hz-ish sharp line

In the newer two traces, there's a 0.695Hz line which is new to me.

There should be no difference between green and blue except environment noise as far as I can tell.

2. Low frequency

Red, blue and green are all worse than brown at f<0.1Hz. Somebody needs to do on/off test to identify what's offending.

3. High frequency

High frequency noise at f>5Hz apparently changes with time.

4. Vincent's thing is definitely good for 0.2Hz

35W beam

After Matt was gone, alignment degraded over 3 hours or so and ETMY output of slow servo for offloading VCO was getting large (lock filter output of the ETMY was more than 200000 counts).

Since IOP watchdog was alarming, I unlocked the cavity, reset the ETMY LOCK filter and relocked.

My guess is that the servo is running fine and it's just that the cavity length drift is big due to tidal or whatever. Regardless, I reduced the gain by a factor of 2 (H2:SUS-ETMY_M0_LOCK_L_GAIN=-0.1 instead of -0.2), as I want to provide more window to potential seismic/sus data mining for the night before the IOP watchdog potentially freaks out.

BTW the alignment got back to normal though I didn't realign. The poor alignment was apparently caused by the length drive  with large length to angle drive coupling.

Andres R, Betsy B, and Jeff B took the transfer function for Phase 1b testing of the HSTS MC1 suspension. This data has been plotted and is ready for review.