TITLE: 12/20 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC

STATE of H1: Corrective Maintenance

INCOMING OPERATOR: Ed

SHIFT SUMMARY: After two attempts of initial alignments, the alignment looks okay now. First lock attempt I went all the way to PRMI LOCKED without a problem (until I moved a wrong optic and broke lock, that optic was moved back). Now it won't even get passed Locking ALS. It kept breaking lock at ALS DIFF. I followed Jenne's document and checked ETMX ESD settings. Everything looks fine. 

After Jeff and I struggled to get a good Y-arm alignment earlier this evening due to weird fringes, I managed to get rid of them by moving BS in yaw (this is after I put it back to where it was -20 hours ago which I thought was a good alignment). This make senses if the ALS camera locate in the corner station (is it?). It's a small victory of the night. Now moving on.

Meanwhile more earthquakes from Greece and Papua New Guinea have arrived.

5.1M Vanuatu

Was it reported by Terramon, USGS, SEISMON? Yes, Yes, No

Magnitude (according to Terramon, USGS, SEISMO): 5.1, 5.1, NA

Location (according to Terramon, USGS, SEISMON): Port-Olry, Vanuatu

Starting time of event (ie. when BLRMS started to increase on DMT on the wall): ~4:30 UTC

Lock status?  Unlocked

EQ reported by Terramon BEFORE it actually arrived? Terramon page loaded AFTER the earthquake has arrived.

6.4M Solomon Islands

Was it reported by Terramon, USGS, SEISMON? Yes, Yes, No

Magnitude (according to Terramon, USGS, SEISMO): 6.4, 6.4, NA

Location (according to Terramon, USGS, SEISMON): Kirakira, Solomon Islands

Starting time of event (ie. when BLRMS started to increase on DMT on the wall): 4:48 UTC

Lock status?  Unlocked

EQ reported by Terramon BEFORE it actually arrived? Terramon page loaded AFTER the earthquake has arrived.

6.7M Solomon Islands (Terramon only)

Was it reported by Terramon, USGS, SEISMON? Yes, No, No

Magnitude (according to Terramon, USGS, SEISMO): 6.4, NA, NA

Location (according to Terramon, USGS, SEISMON): Kirakira, Solomon Islands

Starting time of event (ie. when BLRMS started to increase on DMT on the wall): 5:09 UTC

Lock status?  Unlocked

EQ reported by Terramon BEFORE it actually arrived? Terramon page loaded AFTER the earthquake has arrived.

J. Kissel, N. Kijbunchoo

We're on level three distraction from what we believe is our potentially main issue/problem:
- (Level 1) We started hoping to return to nominal low noise ASAP to test whether the ETMY PUM/L2 stage coil driver swap has improved the recent plague of glitches, and/or changed that stage's coil balancing, length-to-pitch plant, or actuation strength.
- (Level 2) We then had trouble with ALS losing lock constantly before finding IR. So, we spent a few hours just going through ALS locking steps one at a time in hopes to find a specific problem. This go us no where, and as per typical, we got lucky once and made it past all the way up through COIL_DRIVERS after DC_READOUT and POWER UP. We saw an oscillation in IFO signals eventually lead to a lock loss.
- After failing again at ALS, we decided it must be initial alignment (given evidence of low green power from the X Arm).
- (Level 3) Once finished with the first round of initial alignment (which took particularly long because SR2 was in the wrong spot), we found the Y-arm totally hosed in alignment.

Now, Nutsinee and I are just chasing our tails with the Y arm green locking, likely because of the 2 [deg] C temperature swing of the YVEA after the chiller failure.

I'm going home, Nutsinee's just going to wait it out until the temperature returns to normal.

J. Kissel

While Nutsinee and I were trying to debug why SRCL would not trigger during SRY initial alignment sequence, I noticed that SR3's ODC vector showed red. As I've seen in several suspensions, it was the comparison between a user-entered-but-rarely-paid-attention-to "H1:SUS-SR3_M1_DAMP_[DOF]_STATE_GOOD" channel that was not set to match the current state of the filters, "H1:SUS-SR3_M1_DAMP_[NOW]_STATE_NOW."
This appears to have gone bad on Nov 17 2016 00:26 UTC (Nov 16 2016 16:26:00 PST), when Sheila added highest vertical and roll mode notches for the HLTS -- see LHO aLOG 31553. 

Fixed now. Doesn't matter, but one less bit of red to distract people. 

Changes have been accepted in the SDF system in both the SAFE and OBSERVE.snaps.

It looks like the EY chiller 2 has tripped. I have started the alternate water pump (CWP1) in order to enable chiller 1. 

J. Kissel, N. Kijbunchoo

Found ALS Fiber Polarization high at ~20% for X Arm Fiber PLL. Went to CER and reduced it. Couldn't get better than ~9%, but should be good enough.

(see Dave B's entry @ https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=32741) 

TITLE: 12/19 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 66.0999Mpc
INCOMING OPERATOR: Nutsinee
SHIFT SUMMARY:
A bit of a slog.  H1 was locked for a few hours at the beginning of the shift and then taken down (while L1 was down) to swap the ETMy L2 Coil Driver.  This was thought to be the suspect of our glitchy H1.  But we might be finding out that swapping this out might not be trivial.  

LOG:

• 17:25 Ken driving to woodshop to adjust water heater (20min)
• ETMy L2 PUM Coil Driver swapped out
• 18:45-19:40 ETMy L2 Coil Driver Swapped out (Fil, Robert)
• 19:42-20:19 Initial alignment
  • Tweaked PR3 a bit to maximize the Comm beatnote
  • SRC was a bit ugly.  Tried DOWN a few times & re-requestsUsed SR2 tweak trick from here.
• 20:19-??:  Locking (much help from Kissel and Jenne)
  • Have had a tough time in the early stages of locking (namely ALS)
  • Also have had low values for ALS X-arm.
  • Once we made it through this the alignment didn't look great and the PRM had to be adjusted to get flashes (of course after the BS was adjusted during CHECK MICH FRINGES).
  • Then we made it to the COIL DRIVERS state and this is where we had a signal (PRC Gain) ring up and lose lock.  It's not surprising because Kissel said this is where we first use coils and we have a new situation for ETMy.  
  • Handing over H1 to Nutsinee.  Saw her starting a new alignment.

J. Kissel, J. Driggers, C. Gray

Ever since the sudden drop in X-arm green laser power in Oct 2016 LHO aLOG 30884, it's been a challenge to pass the metric for determining whether the arms are locked well enough to begin locking ALS -- if ALS-C_TRX_A_LF_OUTMON and ALS-C_TRY_A_LF_OUTMON are greater than 0.9 (normalized [ct]). However, we often see via other metrics that the arms have settled and are in a fine enough condition to move through ALS. 

As such, we've lowered the threshold on X arm transmission to 0.85.

This is modification to the 
/opt/rtcds/userapps/release/isc/h1/guardian/ISC_library.py
The change has been committed to the repository.

What is going on to explain the exhaust pressures depicted in the attached?

It seems like the LVEA temperature is not as stable as it should be, and among other things this might be correlated to the slow trend of ALS diff signal going down. It used to be 0dBm, now it's -8 to -10 dBm.

Since diff (X-Y) is degrading much faster than comm (X-SHG),  and since it's degrading faster than the SHG power, this is probably just an alignment of some steering mirror on ISCT1. This needs to be fixed tomorrow during the maintenance.

Alog entry from DetChar points to ETM PUM chassis as a possible source for the glitchiness seen over the lock stretches. Robert Schofield says magnetometer in ETM SUS rack confirms glitchiness is coming from inside rack. This morning we replaced PUM S1102652 with S1102648.

Kyle, Gerardo, Dave:

This morning we ran the cp3 and cp4 autofill code, testing its monitoring of the discharge line pressure. Ryan was at MY during the tests, and introduced a high discharge line pressure (DLP) by manually controlling the bypass valve.

Attached are trend plots of the two events, CP3 on the left, CP4 on the right. Each 2x2 plot shows the two thermocouple  (TC) readings on the left, the fill valve position upper right and the DLP bottom right.

CP3:

This CP filled before the DLP could climb over the 2.0 PSI threshold. The autofill terminated normally, with the TCs reading a temperature below the threshold of -30C. The log text shows a normal fill sequence:

Mon Dec 19 11:05:02 PST 2016
Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 25% open. Fill completed in 43 seconds. LLCV set back to 19.0% open.
 

CP4:

This CP caught the DLP above threshold error before or simultaneously with the TCs dropping below the -60C threshold. This is reflected in the autofill log text (error shown as bold text)

Mon Dec 19 11:10:02 PST 2016
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Over pressure. Fill stopped. LLCV set back to 36.0% open.
 

We believe this has successfully tested the code will stop filling if the DLP line goes high. On Wednesday 21st we will run the system in hands-off mode.