The squeezer got stuck trying to lock the CLF tonight. I thought this could be related to the low LO power at the CLF demoduator (see attached screenshot), but it looks like this level has been low for a while. Corey init'd the SQZ_MANAGER guardian and it locked the CLF just fine so we don't know what was actually causing the problem.

(We initially thought that since CLF_REFL_RF6_DEMOD was super low (-50) that we needed to align the ZM's but we were confusing the LO and CLF loops -- the RF6 was low because the beam diverter was closed and does not get opened until the next step in the locking sequence.)

After running an alignment earlier, Sheila suggested I increase the FSS COMM Gain from 26dB to 29dB (Over last couple of days we have gone up from around 23dB up to 26dB due to the RefCav transmission nose-diving after the big Peru EQ).  Unfortunately after I went to this higher gain, I could no longer get past LOCKING_ALS...even when I reduced the gain back to 26 & 25dB. 

At this point I gave Jason a call so he could walk me through what to do to touch up the RefCav alignment.  Starting at about 1.77V, I was able to take a decent step up to around 1.84V, but after that I just could not get any big improvements...I might have max-ed at about 1.87V...but this is still pretty horrible since this should be up around 4V (and this was with me spending atleast 90min trying to touch up the alignment. (a few hours of the transmission signal is attached).

I finally decided to give up on this and move on. 

The FSS COMM Gain was at 25dB (1dB lower than at the beginning of the shift); I was hesitant to go to 26dB or higher due to the difficulties in getting past LOCKING_ALS earlier. 

LOCKING:

One attempt broke lock at ACQUIRE DRMI.

Current attempt maid it to OFFLOAD_DRMI_ASC...but I really had to watch it toward the end of this step because the last few steps of this state would drive POP18 down & make PRC Gain noisier---I literally had to tweak SRM in Yaw quickly to keep the alignment from being driven off and breaking lock.  Have optimized alignment best I can here at DRMI, and have hung out at OFFLOAD DRMI for about 10min (to make sure everything looks calm & flat before moving on)....Will move on and see what happens.

[And I need a break, so will be making lunch soon.]

Due to issues with locking & a refcav transmission which has been dropping since yesterday, I gave Jason a call & he walked me through how to touch up the alignment remotely via the picomotors.  It's pretty tough!  Have managed to make a step up from 1.77 up to about 1.86, but I've been stuck here for tens of minutes.   Will continue to peck away at this, but might have to live with what we got.

TITLE: 05/27 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Aligning
OUTGOING OPERATOR: Cheryl
CURRENT ENVIRONMENT:
    Wind: 12mph Gusts, 9mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.08 μm/s

Useism is really low & winds are not bad.
QUICK SUMMARY:

• Received hand-off from Cheryl & she restormed a couple of optics she was working on.  So will be starting an INITIAL ALIGNMENT.
• Attached is a look at the RefCav Transimission....looks like we just hit the low value over the last few hours and should be going up for the next day or so touching up on Tues should be OK (but we'll see how locking goes tonight).
• While Cheryl was here, went to check on the TCS chillers.  Both were near (at or within 0.1cm) of nominal, so no water was added to either.
• OK, on to ALIGNMENT!

TITLE: 05/27 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Aligning
INCOMING OPERATOR: Corey
SHIFT SUMMARY:
LOG:

• after H1 lost lock, I tried relocking, and only made it to DRMI once
• I did an initial alignment, and that went well, but again, didn't make it through or past DRMI
• started looking into other things that might be an issue
• optimized POPAIR RF18 to a value of 72, but lock didn't survive
• reset DRMI optics to values closer to our long lock from about a week ago, (latent EQ recovery, biggest changes, PR2 and IM4)
• as I reset PR2 and IM4, the X arm was locked in IR, so I could see that PR2 dropped the X arm power, and IM4 brought it back up, sanity check
• handing off to Corey
• looking at FSS_TPD, I raised the gain to 26dB

• H1 lost lock, which looks to coincide with a small spike at EY.
• Relocking isn't going well - can't get past CHECK-IR
• FSS plots attached, because yesterday FSS TRANS PD DC was at 1.9, and now it's at 1.71
• I raised the Common gain by 1bB (the amount Georgia did yesterday), and tried relocking, and this did not help, still can't make it past CHECK-IR, keep looking
• checked the MC2 pitch alignment through the IM1 baffle, the total span is 330 to 720, and the current value is 550, so it's OK, keep looking
  • 330, light visible on top right of aperture in baffle
  • 720, light visible centered at the bottom fo the aperture in the baffle
• it's made it to PRMI, touching up alignment

TITLE: 05/27 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 110Mpc
OUTGOING OPERATOR: Jeff
CURRENT ENVIRONMENT:
    Wind: 16mph Gusts, 13mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY: locked over 2 hours, winds peaked at about 23 mph, 30 minutes ago, and are currently around 15 mph

   Lost lock at 09:57 (02:07) due to mag 5.8 Canadian earthquake. After things settled down enough to relock, had three lock losses at RESONANCE. The BS ISI tripped at the third lock loss, so decided to run an Initial Alignment (11:41 (04:41)). This went well, and required little hand adjustment. Started relocking at 12:07 (05:07). Reached NLN at 13:07 (06:07), and went into Observing at 13:08 (06:08) after clearing SUS TMS-X SDF Diff.    

   In observing for first 3 hours of shift. Lost lock due to mag 5.8 EQ in Canada. After seismic rang down enough started relocking. Had to dress up the BS and PRM (in Yaw). Have lost lock at RESONANCE (one HTTS and one SRM saturations). Still breaking lock at RESONANCE, but now with no saturations. Am looking in documentation for guidance.    

TITLE: 05/26 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 104Mpc
INCOMING OPERATOR: Ed
SHIFT SUMMARY:

First half of the shift was focused on getting H1 back UP & then had a short drop to address the PSL Refcav's drift downward (see alog).  Started Jeff's shift with a GRB (& also a coyote sighting...we saw it getting a nice shower in the sprinklers in the back & having a drink from them, too!).
LOG:

• 23:02 Closed/reopened a frozen medm on VIDEO2
• 23:09 Back to OBSERVING (after SQZ lost lock & bumped out of previous OBSERVING segment)
• 23:37:42:  Out of OBSERVING due to SQZ
• 1:39 - 3:28 Locking/Alignment & back to Observing
• Out briefly to ramp up the FSS Common Gain.

(Georgia, Corey)

4:30:01 - 4:31:50:  Out of OBSERVING

Once again noticed the symptom of a noisy DARM spectra above 2kHz.  With Georgia on the phone, we bumped H1 out of OBSERVING, to ramp the Common Gain up 1dB from 24 to 25 (this was enough to fix DARM).  

Georgia mentioned this is due to the PSL Ref Cab transmission dropping (usually around 4V, but now it is on a downward trajectory [currently at 1.8V]); Hoping we can last until Tues to fix this via the picomotors, but in the meantime the fix, once again is inching the Common Gain up.

If this appears again, one can click this gain up 0.1 steps at a time (while H1 is locked) & watch DARM as you go (it should drop the high frequency noise).  You know you've gone too far if the PZT MON on the FSS medm starts to look noisier.

It's been an hour and after making lunch came back to see a very glitchy H1.  The start of this one looks similar to the start of the other post-EQ lock earlier today.  Will keep monitoring.

After the last lockloss a few things occurred:

1. IM2 & 3 were adjusted to post-EQ values (Cheryl)
2. Green Shutters were closed on both ISC tables at end stations (not sure if this was normal or not, but it stumped me until Georgia pointed it out).  Then ran an alignment with new (restored) IM-values.
3. For locking did have a few locklosses at LOCKING_ALS & this might be due to the FSS?  Georgia said we might have to change the FSS COMM gain gain again if there are more problems at this state.  At any rate, did make it through this and made it all the way to NLN.  At OFFLOAD_DRMI_ASC, did hang out here for a while.  Tweaked up POP18 via mainly SRM & this took POP18 to its preferred ~60counts.  This also quieted down the POP18 & PR_GAIN signals.

SDF Diffs at NLN:

1. PSL FSS common gain---> significant digit issue:  ACCEPTED
2. IM2 & IM3 pitch offsets:  ACCEPTED
3. TMSX pit & yaw offsets:  ACCEPTED

Out of OBSERVING from 23:37 - 2:32utc.

TITLE: 05/27 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Corey
SHIFT SUMMARY:  locked most of the shift, issues listed below
LOG:

• handed off locked with violin damping
• Sheila called, scripts run to recover arm pointing likely removed a TRAMP time for TMSX, which is necessary for the stage INCREASE_POWER (was 0, now 30)
• Sheila restored the TRAMP time, I accepted it in SDF, H1 made it through INCREASE_POWER without issue, and then on to NLN
• (UPDATE: in DOWN, the SDF for the TRAMP was not saved, so came up as a diff, I accepted it, so it should not reappear)
• in NLN, H1 was very glitchy and SQZ lost lock a number of times, and the range ran low, between 80 Mpc and 90 Mpc for more than an hour
• Georgia called, and increased the FSS COMMON_GAIN from 23dB to 24dB, since the DC  light level was down around 1.9V on the TPD
• this brought the high frequency noise in DARM back to a normal level
• during this time, winds increased and gusted up to around 38 mph (current max is holding steady at around 35 mph)
• at shift change, H1 was locked but SQZ was unlocked
• handed H1 off to Corey, and then H1 lost lock
• after lockloss, I realigned IM2 and IM3, which had shifted alignment when the ISI tripped (IM4 did as well, but since it's driven and the change was well withing the range that IM4 is typically pointing, I did not set IM4 back to the old values, however, it might need to be checked again once Corey gets to locking the arm in IR)
• I checked tht IM4 trans QPD, ISS Second Loop QPD, and confirmed the IM alignment changes were seen on these QPDs
  • previous time when H1 was unlocked, to unlocked after the EQ, to now restored
    • IM4 TRANS pitch: was ~1.6, then ~3.6, now ~0.17 -> change due to EQ(IMs) = 0.2
    • IM4 TRANS yaw: was ~1.4, then ~1.5, now ~1.4
    • ISS2 QPD pitch: was ~0, then ~0.56, now ~0 -> change due to EQ(IMs) = 0.6
    • ISS2 QPD yaw: was ~-0.05, then ~0.0, now ~-0.07
• Corey's doing an initial alignment

IM Shift & Restoring Pre-EQ

After antoher SQZ unlocking followed by a close H1 Lockloss, took this opportunity to take the IMs to their pre-Peru-EQ values (Cheryl did this...most notable change was Pitch for IM2 & IM3)---this is mainly because the last lock was not great & we're hoping that fixing the IM shifts will help H1.

ALS PDH Errors

On a seperate note, after H1 lost lock, noticed that we do not have any light for ALS x & y (green).  On the ALS Overview both X & Y have "ERROR 4 PDH" errors. 

This is is what I'm going to look into next.  Once through ALS issue, will run a new INITIAL ALIGNMENT to the new IM pointing & see how H1 likes that.