10/22/2012 - from Morning Meeting

LVEA work:
- HAM installation arm going on HAM2 E door today
- MC3 and MC1 prep chamberside continues
- HAM3 ISI being tested - may be something rubbing
- HAM3 table alignment is OK
- HAM6 RF cabling - needs to be tested
- BSC2 - one more housing to install, then actuators

EX work on hold

EY - dead ion pump, Richard shutting down power,

H2 PSL - old eLigo OMC work with electronics

-----------
End of the day:

Multiple reboots and recompiling of EY - not currently in a working condition - Dave, Jeff, Jim, and Vincent are working on it

IAS in LVEA looked at ITM pitch - Doug, Jason
- some spikes in dust, and when I talked to Doug about activity in the cleanroom with ITMY, it seems like the spikes were due to the sock coming off of the quad

iLigo OMC moved to H2 PSL enclosure, electronics hooked up and tested - Keita, Corey

• Pitch: 2.77 mrad down
  • Target pitch: 12.5 µrad up
• Yaw: 1.38 mrad CCW
  • Target yaw: 0.0 µrad

We tested the trans impedance switches of the old L1 OMC which was used in H1 squeezing (old H1 OMC is at LLO) because we'll reuse the electronics, and because, during the squeezing test, the trans impedance was stuck at 400 Ohm.

Back then we observed (without opening HAM6 chamber) that one of the z-switch pin was somehow short-circuited to the bias voltage pin somewhere inside the chamber, thus energizing the relays. We assumed that the short circuit is on the in-vac cables connecting the vacuum feed through and the OMC cable bracket, i.e. not on the part that is on/inside the OMC cage, but we never confirmed that that was the case.

Today we connected the OMC, still in the suspension cage, to the dummy flange using a class A DB25 cable, then connected the dummy flange to the OMC whitening box (D070281) via a dirty DB25 and a break out board.

We used a Stinger flashlight which caused the in-vac whitening output to jump to about 0.5V.

When we connected 5V power supply to the trans impedance relay input and the ground on the out-of-vac side (pin17=+5V and pin16=GND for PD1, pin21=+5V and pin20=GND for PD2), we were able to hear the relay clicking, and the output of the in-vac whitening became about 2V.

So, everything is working fine, whatever trouble we had in squeezing is the in-vac cable failure, and we can reuse the electronics. 

Kyle, Gerardo 

Found IP11 controller was energized but with its HV not selected (HV LEDs on but "flashing") -> selected HV output for pumps A and B and OK now -> Increased max. power from 100W to 200W and max. current from 10mA to 20mA (did this so as to match other units) -> Don't know why/how the HV outputs changed states on Saturday(?).

Betsy, Mark

As Mark is still debugging the Matlab scripts which run the TFs, I went back to the "old" way and ran them via DTT.  All of today's data and plots have been committed to the svn repository with file names:

2012-10-19_1434_H1SUSMC3_M1_*  (TFs with Damping ON)

and

2012-10-19_1550_H1SUSMC3_M1_*  (TFs with Damping OFF)

Attached is the plot of this data compared with MC3 and MC1 data taken in the staging building.

Mark B.

Jeff K and I both noticed that the watchdog DC band-limited signals on MC2 and PR2 were suspiciously small and that in fact the wrong filter, with no response at DC, had been installed. I traced this to a bug in ^/trunk/Common/MatlabTools/make_OSEM_filter_model.m, ultimately called by .../prepare.m. The section of code from line 235 had "ac" in several places where it should have had "dc" and so was loading the AC filter instead. I fixed the error and committed the new version.

I tested the fix by re-running prepare.m on MC2 and it did install the intended filter (flat up to 10 Hz and then rolling off). 

Because the code is used by all HAM triples, I then reran prepare.m on all the others in H1, i.e., MC1, MC3, PRM, PR2, PR3 and SR2. After running prepare.m for each suspension, I clicked LOAD COEFFICIENTS on all 6+4+4 filters in the DC path blocks of the three levels of watchdogs for all suspensions, and re-enabled damping for installed suspensions.

There are currently no other types of SUS-scope suspensions on H1 but for good measure I checked FMy and ETMy on H2 and they had the right filter already.

The same fix will need to be applied to the HAM triples at LLO.

• x-axis position: -0.7mm (South)
• y-axis position: -1.0mm (East)
• rotation: 200 µrad CCW

Attached are the power spectra plots for the M2 and M3 levels of H1-SRM. 

Michael R, Rick S, Cheryl V

The exterior surfaces of the PMC mirrors inside the tank were cleaned today. Our cleaning method involved wiping the mirror's surface with acetone 5 times, followed by 5 wipes of methanol. All four mirrors were cleaned. The result is a gain of 10W in transmission, from 140W to 150W.

As of today, the interior surfaces of the input and output PMC windows, as well as the exterior surfaces of the PMC mirrors have been cleaned. The FSS and ISS windows have not been cleaned yet. We have gained about 19W total from cleaning both the windows and the mirrors.

Mark B.

Started TFs concurrently on both MC1 and MC3 at 16:50. Will monitor from home tonight.

At 22:30, MC1 had finished undamped TFs and was making good progress on damped TFs, but MC3 had tripped (just) the USER DACKILL again and I aborted the script.

We pulled all the 'unplanned' auxiliary payload from the ISI and located the 60kg of makeup mass per D1000906.  This mass is bolted down and with conversation with SUS should not be in the way for Suspension or Template installations.
I was going to survey the table with all the payload removed but I just forgot and then didn't want to unbolt and remove the 60 kg of mass.  It does have substantially less weight on the Optical Table now though and I did shoot the elevations again:

Three of the four shots were exactly the same elevation, the NE corner of the optical Table was 0.1mm higher.

ITMy has had its ECD magnets replaced with the dummy Al blocks and BOSEM captured screw brackets installed.  Due to the change of COM induced by the ECD magnet replacements (actually a correction to the COM as calculated), some minor pitch alignment work is required on both chains.  This alignment will be done to the "by-eye" level tomorrow.  Simultaneously, we will work on recabling and beginning to re-test.

Betsy and Filiberto

Although I saw some coherence yesterday after we continued our excitation hunt yesterday, it was likely only on DOF signals with large T1 and T2 OSEM drives.  The excitation problem  continued even though Mark reported that I had reported things looked improved in his alog yesterday.  Yesterday, I also found that the quadrapuss which was switched into this supension last week was broken - one of the legs had  a band-it come loose.  I took that cable out and plugged back in the original quadrapuss.  Filiberto and I traced the in-vacuum to in-air cables up to the satellite box and confirmed we had good signal via inputting offsets in the coil_out channels.  After that I sat back down to DTT.  I then noticed that the template I had been using for diagnostics had incorrect units causing the trace to look funny.  Quick TFs NOW appear to look normal.  So, between Filiberto fixing swapped binary cables, the ADC board swap, the errant quadrapuss swap, and improper plotting of the TF data, MC3 looks to be healthy again.

Side note - after I saw that things looked much better, I switched out the moth-contaminated MC1/MC3 shared quadrapuss cable and tweeked centering of top BOSEMs on both suspensions.

We are ready (again) for Phase 2a TFs on MC3 and Phase 2b TFs on MC1.

PT343B did "fire" a few hours after being isolated from the BT and gave believable pressure values while in the artificially high pressure range of 10-7 torr (see attached) -> Opening back up to the BT resulted in the indicated pressure falling through the nominal value and continuing on into the bogus indicated values 

Leaving 10" pump port valve X1-9 open, i.e. in the nominal configuration

After completing the HEPI Actuator attachment yesterday, the doors have been pulled this morning and elevation surveys have been run:

NE    SE    SW     NW      Notes
-2    -5     +5     +2      Stage0 mils(.001") 
-.7   -.7    -.4    -.5     Optical Table (Stage1) Unlocked mm wrt nominal elevation
-.5   -.5    -.3    -.4     Optical Table ISI Locked mm wrt Target Elevation

We mull over these numbers to see if we need to do anything.  Remember, these may change after we exchange dummy payload for Suspensions...

[Alex, Cheryl, Deepak, Giacomo]

Yesterday we put the optics in all four HAUX:
HAUX SN006: IM1 = SM1-05
HAUX SN007: IM2 = PMMT1-04
HAUX SN008: IM3 = PMMT2-02
HAUX SN009: IM4 = SM2-01

Cheryl and Deepak are now trained in the art of HAUX open-heart surgery! :-)

We also put all cables in place: sat-amp->field cable->adapter cable (fake vacuum feed-through)->extension (just dummies, the final ones are already in the chamber)->quadpuss (finals).
16 OSEMs were connected and tweaked (by moving the LED and/or PD plates) to obtain a open light value of at least 25k. Only two of them (S/N: 211 & 491) were unable to reach 25k (reading just above 20k), and were replaced with 2 of the 4 spares to be on the safe side. The other two (S/N: 230 & 212) were not tested at all.

A list of OSEM assignment and measured open light value follows:

---> IM1
Cable S/N:  S1105084
A (UL)  S/N: 204  OLV: 29000
B (LL)  S/N: 454  OLV: 27000
C (UR)  S/N: 199  OLV: 26000
D (LR) S/N: 262  OLV: 29000

---> IM2
Cable S/N:  S1105082
A (UL)  S/N: 237  OLV: 25000
B (LL)  S/N: 427  OLV: 29000
C (UR)  S/N: 468  OLV: 26000
D (LR) S/N: 450  OLV: 28000

---> IM3
Cable S/N:  S1105078
A (UL)  S/N: 377  OLV: 25000
B (LL)  S/N: 292  OLV: 26000
C (UR)  S/N: 404  OLV: 26000
D (LR) S/N: 309  OLV: 26000

---> IM4
Cable S/N:  S1105083
A (UL)  S/N: 189  OLV: 27000
B (LL)  S/N: 403  OLV: 29000
C (UR)  S/N: 436  OLV: 27000
D (LR) S/N: 239  OLV: 26000

We measured the OSEMs noise in open light position (and exposed to ambient light... not sure how much this impacts performance), as a sanity check and reference. See attached figure (left/right are just two different groups of 8 OSEMs; bottom graphs show the coherence of each OSEMs with he first one, as a check for common noise).

Also, we finished alignment of 2 HAUX (SN006 = IM1 and SN008 = IM3), except for DC pitch balancing, inserted the OSEMs, clamped them down to the table and covered them with a HxTS fabric cover for some night measurements. As we don't have actuation yet, we just let the suspensions swing all night (2012/08/28 from 3:00 to 13:00 UTC should be quiet time). Attached is a PSD taken during this time.