WP 5874

SEI update summarized in T1600090. This includes :

o GS13 signals storing rate changed. ECR E1600077

o STS signals at the senscor channel point not recorded anymore -> ECR E1600077

o blend glitch-> ECR E1500456

o 10 secs delay on coil driver status before triggering watchdog-> ECR E1600076

o remove user dackill-> ECR E1600042

o Cumulative saturation count->ECR E1500325

Thanks to Arnaud for this round up.

Required updating the isihammaster.mdl, guardian isi manager.py and the HAM ISI Overview medm.

See attached for full log.

State of H1: DRMI locked!  Then DRMI lost lock, FSS went into oscillation

H1 Configuration:

• ISS Refracted Power at 15.5% and stable
• FSS Fast Gain at -8dB (per alog 17875 / lowest PZT MON) and I turned the locking loop off (seemed like the right thing to do, given the PZT MON)

Initial Alignment / Locking: 

• Summary: Initial Alignment is complete, but not without trouble; unknown, alignment, Guardian(?)
• Jenne and Sheila finished locking the X arm in IR, but I couldn't get the PRM to lock, I don't know why
• I did another Initial Alignment and spent a lot of time trying to get the X arm to lock in IR again, and eventually punted with raising the gain to 0.1
• SRC locked a couple times, but WFS killed the lock, and I saw SRCL_OUT was railed
• ... and oh, SRM was misaligned in pitch by 800urad, which I would assume is it's actual misaligned position, though it thought it was aligned
• even after realigning SRC, locking it was kicking SRM so hard again it wouldn't lock, I had to take Guardian to the IS_LOCK, run Init and Down, and then go back to Initial Alignment, then take ALIGN_IFO Down and back to SRC_LOCK, then SRC locked and made it through SRC_ALIGN_OFFLOADED
• on to Full Lock, and DRMI locked, but I didn't catch it in time to fix the small misalignment, so DRMI lost lock, that killed the IMC, that killed the FSS, and the FSS is still recovering
• FSS went into oscillation earlier in my shift, and then again when DRMI broke lock, PZT MON is high, I admit I pushed some buttons (Common Gain, Fast Gain, AUTOLOCK on/off) that I think should not have prolonged this situation, however, PZT MON is currently at 9V and slowly dropping, and I have the Fast Gain set at -8dB, after reading Peter's alog 17875.

Activities:

• Chandra - VAC - working with Cryo Pumps (cryo pump 4 was temporarily in alarm)
• Sheila, Jenne - recovery/alignment/relocking H1
• DaveB - DAC - nds1 had to be restarted, glitch in data from 5/9 23:59UTC to 5/10 00:05UTC

Other H1 activities / configuration:

• alignment check/recovery IMs, RMs, OMs, PR2, Y arm quads, X arm quads, TMS X/Y
• dark offsets were addressed
• ETMX BRS X direction is enabled, Y and Z are disabled, Z is turned off, Y has zero gain
• ETMY BRS Y direction is enabled, X and Z are disabled, Z is turned off, X has zero gain

CP4 is back on scale and in PID mode. 

Experimented with PID loops using CP2. 

[Sheila, Jenne, Cheryl]

We found that many optics' drivealign sliders were in the wrong place after last week's RCG upgrade - these are things that we specifically keep out of the SDF system, since they are often changing by small amounts.  But, this means that they aren't kept up to date in the safe and down SDF files.  Anyhow, they have been restored, and we were able to lock and align the green arms, and were also able to lock the Xarm in IR for the input align step of initial alignment. 

Cheryl will attempt the rest of the alignment sequence, so we have a nice IFO for tomorrow.

Sheila, Jenne, Cheryl

Xarm IR locking was difficult again today, and we made two observations. 

We have a more aggresive low pass filter in MC2 M3 than we really need, CLP300.  We locked the arm twice sucsesfully with this filter off and CLP500 on instead. screenshots are attached with the digital gain set to 0.15.  We didn't add this to the guardian yet, but I think its a good idea (third screenshot attached shows the trial configuration).

We are in no danger of saturating M3, but M2 saturates when we are trying to acquire.  This might be the root of some of our troubles accquiring the xarm.   

The noise eater was bad in these periods: [17:34, 17:52], [18:10, 18:39] and [19:38, now-ish] UTC, or [10:34, 10:52], [11:10, 11:39], and [12:38, now-ish] local time.

I went to the LVEA and reset it.

This probably doesn't have anything to do with Peter's dark noise measurements, but this might have caused some confusion when he was measuring the intensity noise.

Following on from last week's entry about the power stabilisation photodiodes
  https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=27054
It took advantage of the laser being down to measure the output of the photodiodes
when laser was off.  The two measurements are quite different.  Not just in
level but also spectral shape.  The spectrum posted earlier is observed when one
tees the signal off and inputs it into an oscilloscope.

    One observation is that the isolated LEMO connectors on the photodiode box
are not isolated from the table surface.  Neither are the photodiode housings
within the box.

Discovered Friday after initial bake cycle that the new calibration leaks (had been closed during bake) were proving to be a significant contamination source when opened, particularly the N2 bottle.  This is worrisome since the fill pressure is sub-atmospheric (500 torr) implying that it could have been opened while at atmosphere? I believe that I have been in control of these since new and would not have done this but I can't be sure as they would have been stored with various other cal-leaks until needed-hmm.  Anyway, I don't have a suitable replacement yet so I elected to rebake everything with the cal-gas valves open - Nominal 200C with exceptions such as <100C for the cal-gas valves.  

Durring the RCG upgrade last week, the automatically generated medm screens were cleaned up.  Apparently there were some places (ALS end station overview is one example) where we were pointing to screens in the wrong directory since the ISCEND and ALS models were split.  This worked until the directories were cleaned up last week.  

I've added macros for alseamodel, alsebmodel, alexmodel, and alseymodel to the isc macros file (userapps/isc/common/medm/isc_macro.txt, iscex_macro.txt, iscey_macro.txt), and edited ALS_ENDSTATION_OVERVIEW.adl to use this.  There might be other places we need to change the model we are pointing to.

All of this is in svn. 

Before Patrick adds channels for smoothing factor to CP liquid levels (right now only available at LX), I wanted to observe the motion of a few of the LLCVs:


CP1 (electric) - some motion (~ +/- 1 mm)
CP5 (pneumatic) - lots of motion (more than 1 mm)
CP6 (pneumatic) - some motion
CP7 (electric) - no noticeable motion (hard to sense even by feeling it)

Did not look at CP8 (electric), but its readback is pretty flat. CP4 (pneumatic) is currently in manual mode and CP3 is shimmed. CP2 (pneumatic) was adjusted last week with 99% smoothing function.

Transition Summary:

Title:  05/09/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT)
State of H1: IFO unlocked. Work on PSL is ongoing  
Commissioning: 
Outgoing Operator: N/A
 
Activity Log: All Times in UTC (PT)

15:00 (08:00) – Start of shift
16:22 (09:22) Peter – Going into PSL to pull inner loop photodiode box (WP #5872)
16:25 (09:25) Kyle – In the LVEA working on RGA
16:40 (09:40) Jason – Going into the H1 PSL enclosure
16:45 (09:45) Kyle – Craning leak detector over the X-Beam manifold
16:57 (09:57) Kyle – Finished craning in LVEA
17:00 (10:00) Bubba – Filling the water tank in the End-Y compressor room
17:20 (10:20) Open gate for people coming to see Ed for Mercury transit
18:00 (11:00) Bubba – Back from End-Y
19:50 (12:50) Jason & Peter – Out of PSL
20:00 (13:00) Dale – High school tour of control room
20:25 (13:25) Corey – Going into Optics Lab
20:45 (13:45) Dave – DAQ restart
20:50 (13:50) Sheila & Jeff – Reset ALS fiber polarization for X and Y
21:45 (14:45) Kyle – Going into the LVEA to check RGA temperatures
22:01 (15:01) Kyle – Out of the LVEA
22:10 (15:10) Peter – Going into the H1 PSL enclosure
22:38 (15:38) Kyle – Going into LVEA to check RGA temperatures
22:45 (15:45) Jason – Going into the H1 PSL enclosure
 
End of Shift Summary:

Title: 05/09/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT)
Support: 
Incoming Operator: Cheryl 

Shift Detail Summary: Work continues on the PSL and vacuum system. Other groups taking advantage of this time to make updates and upgrades. 

Set CP4 to manual mode at 25% LLCV open. Then installed flow meter at exhaust. Will leave as-is for a couple hours to observe changes in LL or exhaust pressure like we saw last Friday (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=27057). The LL spikes may have been driven by the LLCV PID. Switching to manual mode should exploit that variable. 

2:45pm local time

1/2 turn open LLCV bypass valve - took 1:05 min. to overfill CP3. 

Trends for last week.

Sheila & Jeff B. - Adjust ALS X and Y fiber polarization  

Some more items related to POP X commissioning:

Gain and whitening

I set the analog gain at 39 dB, which is what is required to make the whitening chassis + ADC dominated by the input noise of the whitening chassis at 1 Hz. This might be overkill.

Phasing and quadrature separation

We wanted to check the quadrant phasing on POP X using a laser that can be amplitude modulated at 36 MHz. I used the same ISC laser that Kiwamu and others have used previously on other ISC photodiodes (e.g.: 9630).

Today this laser was putting out 3.4 mW dc. I drove its rf modulation input with −40 dBm at 36.4 MHz, and then tuned the frequency until the beat note showed up in the digital system at around 40 Hz. Assuming Kiwamu's calibration is still correct, this implies a total rf optical power of about 55 µW pk coming out of this laser.

The separation between I and Q for each quadrant was already pretty good (see attachment), and only needed a few degrees of adjustment.

I also wanted to balance the relative phase rotation of the four quadrants by zeroing the phase between I1 and I2, then I1 and I3, and then I1 and I4. However, by physically rotating the orientation of the laser relative to the WFS diode, I found that I could change these relative phases by tens of degrees. So it seems this setup cannot be used to set the quadrant rotations.

The beat note showed up in each quadrant with about 5000 ct pk amplitude (with a 20% spread between the quadrants). Assuming a large fraction of the laser light is falling on the diode, this allows us to estimate the order of magnitude of the gain of each quadrant: it is of order 4×10⁶ ct/W, assuming no analog gain from the whitening chassis, no digital gains, and no whitening.