1370888354 Lost lock from the s-wave of a Mag7.2 Earthquake, near Tonga. Holding in DOWN until the Earthquake passes.

On Robert's request, we are keeing the CDS WIFI transmitter in the MSR powered on. I have modified the CDS SDF accordingly.

Camilla, Dave:

nuc26:

nuc26 had an OS issue overnight which caused it to transition its root filesystem to read-only mode. I rebooted it at 08:11 PDT and it is operating correctly now.

nuc30:

The camera image for cam15, HAM6 OMC TRANS, went blue screen at 07:56 PDT this morning. I restarted the camera server on h1digivideo1 and then power cycled the camera by POE toggling on sw-lvea-aux to no avail, h1cam15 still does not respond to pings. Further investigation is needed.

TITLE: 06/15 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 11mph Gusts, 7mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.14 μm/s
QUICK SUMMARY: Ryan just got us back to NLN at 14:55UTC, range 137MPC. Waiting for ADS to converge before going to Observing.

VAC, SUS, SEI, CDS, dust monitors all okay.

TITLE: 06/15 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
SHIFT SUMMARY:

Lock#1:

NLN at 06:00, in Observing at 06:12, out at 06:43 from the SQZer unlocking, back in Observing at 06:45

Lockloss at 08:04, most likely from some local ground motion event. Ground motion seen mostly in the 1-3, 3-10 Hz bands. The 10-30Hz band saw the motion too but not as strongly.

Lock#2:

Xarm ran through increase flashes twice, couldn't get DRMI, went through PRMI which locked quickly, then locked DRMI in ~5 minutes.

NLN at 09:23, in Observing at 09:29

Lockloss at 13:52

Lock#3:

Yarm went through increase flashes, DRMI locked without needed to go through PRMI

NLN at 14:55, waiting on ADS to converge to go into observing

LOG:

Lockloss at 13:52UTC, no obvious causes to the lockloss, there was an EX saturation seconds beforehand just as with the last lockloss.

We had one lockloss due to anthropagenic ground motion at 08:04, relocked without any intervetions. Back to NLN at 09:23, Observing since 09:29UTC

Quick lockloss at 08:04, EX saturation then an immediate lockloss, LSC_PR_GAIN_OUT16 channel on NUC30 look like it rung up a few seconds before the lockloss

TITLE: 06/15 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 133Mpc
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 13mph Gusts, 10mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY:

• CDS, Dust, VAC, SEI look good
• Locked at NLN for 1:04

TITLE: 06/14 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
SHIFT SUMMARY:

More observing than last night, but there was another shorter wind storm (winds over 30mph) which prevented locking for 3+hrs.  Commissioing time was used for a Robert measurement and PRCL OLG.  Squeezer knocked H1 out of Observing for about 3min toward the end of the shift, but came back on its own.

LOG:

• H1 was on its way back to NLN at shift transition.
• 2318-2352 Pcal Lab (Tony & student)
• 2321-2326 Grabbing laptop in Cleaning Room (near CER) (Robert)
• LOCK#1 (handoff from Camilla):  2317 At NOMINAL_LOW_NOISE, but had a couple stragglers which held up OBSERVING a couple minutes.
  1. Had some SDF Diffs for ASC/ADS Lines a couple minutes after NLN---they went away on their own
  2. 2321 VIOLIN DAMPING guardian finished a final 5-min sleep
  3. 2322 Back to OBSERVING!
  4. 2351 LOCKLOSS!!
     1. Lockloss 1370821883:  There were some winds above the 20mph for the Corner Station.
• 2352 ETMY x-sensor correction made (jim, see his alog)
• LOCK#2:  For this one, it made it to NLN, but waited a 5-min for VIOLIN_DAMPING, and this time the CAMERA_SERVO node was the longer straggler
  • 0042 NOMINAL LOW NOISE
  • 0048 CAMERA SERVO node was completed and now officially at NLN
  •  
• 0018 Checking Corner Station DustMon pump (Tony)
• 0048-0121 COMMISSIONING time
  • 0048-0049 PRCL olg meas #1
  • 0049-0119 Robert Measurements
  • 0119-0120 PRCL olg meas #2
• 0115 Start to see wind speeds begin to peak above 30mph :(
• 0121-0219 OBSERVING
• 0219 LOCKLOSS (1370830764.658203):  EY has been having winds hitting the 30+ mph range.
• 0252 Observatory Mode to WIND & waiting out wind
  • 0410 Return to locking after signs of winds stabilizing/dropping
  • 0439-0458 Initial Alignment (since I couldn't touch up PRMI better and Check Mich Fringes didn't help)
• LOCK#3 0511-061
  • 0600 pseudo NLN, but had to wait for the Camera Servo to complete after about 13min.
  • 0612 OBSERVING (after riding out winds peaking in the mainly 30-40mph range which prevented locking for a solid 3+hrs.
• 0609 PIMode31 verbal twice, but it was damped fairly quickly--no action taken
• 0643-0645 Bumped OUT of OBSERVING due to Squeezer
  • 06:43:47 SQZ MANAGER log said:  "[FREQ_DEP_SQZ.run] Unstalling SQZ_OPO_LR"
  • Going to the OPO_LR node, the log's first line was:  "2023-06-15_06:43:46.953215Z SQZ_OPO_LR [LOCKED_CLF_DUAL.run] OPO servo output railing"
  • And then SQZ nodes were all actively doing things and returned to normal at 06:45:43.

At about 615pmPT (or 115utc), winds started peaking above 30mph (lockloss at 219utc), and have flattened out there with some peaks hitting 50mph.  Not as dire as last night, but it is a windy ruckus out.  Taking OBSERVATORY Mode to WIND, keeping ISC LOCK at LOCKING ARMS GREEN, and will assess in 1hr.  Oh there was also a 6.2 EQ from the Phillipines, but Seismic is already back to Calm.  (Time to make supper.)

If it's like yesterday, the winds started to die down after the sun went down around 9-10pm.

Another pretty windy day, I've been looking at the ETMY ISI to see if any changes can be made to help staying locked. Only easy thing I've found so far is turning off the off-axis sensor correction. Watching the outputs here, it is contributing to the ISI swinging  several microns. I don't think it will change much, but don't have a lot of other things to try, at the moment, and it probably can't hurt. I've accepted the diff in the observe file, so this shouldn't affect our ability to go to observe when Corey is done relocking.

Attached trend shows the St1 X cps on the top, on the bottom 2 different points of the X sensor correction path to show when I turned it off, green is the filter output, orange is the output of the downstream match bank where I turned off the output. When the sensor correction is on the CPS is mostly dominated by it at low frequency, swiinging almost 10 microns at points. With sensor correction off, when the orange trace goes to 0 on the bottom, the cps stops moving around so much.

Our range and SQZ BLRMs were low in this lock compared to yesterday so after checking that our RF6 power H1:SQZ-CLF_REFL_RF6_DEMOD_RFMON was still high (Good NLG) after Sheila adjusted it last week. I adjusted the SQZ angle from 16:45 to 16:55UTC and 17:05 to 17:15UTC, this is currently allowed during Observing but tagging DetChar just incase. It's a little confusing that improving SQZ BLRMs decreased the H1 range, see attached. Started at 141deg, ended at 130deg, I think there's room form more improvement and something is off.

TITLE: 06/13 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 131Mpc
SHIFT SUMMARY: Easy relock after Tuesday Maintenance but the wind is forecasts\ to pick up this evening.
LOG:

• 15:08UTC (1370704124) Caused a deliberate Lost lock for Tuesday Maintenance alog70399
  • Maintenance day details below and in alog70411.
• Relocking was uneventful. Did an initial alignment and only assisted in green arms locking, details in alog70424.
• NLN at 21:14UTC, Observing at 21:25UTC. Brina accepted a sdf for alog70423: 4:1 Hz MICH1 FM3 filter.
• 22:42 - 22:43 UTC Out of Observing as SQZ OPO unlocked, unsure why. Plot attached. Tagging SQZ

There is a computer Patrick left  turned on in the EY Mech room on HEPI pump controller, Robert powered off the monitor but said that he has previously done research that new style LED monitors are less nosy than computers.                                                                                                        

I think the recent issues with squeezer pump ISS railing are likely resolved after today's on-table realignments. The green pump AOM was significantly clipping the beam (SQZT0 layout here, "GAOM1"), both reducing the total power after the AOM, and degrading the fiber coupling efficiency due to the clipped+bad mode shape. See GAOM1 sweeps from this morning (before aligning, left) and now (after, right). Along the pump path, we now have better GAOM1 throughput (~90%), comparable diffraction efficiency (~60%), and improved fiber coupling. For 60uW opo trans we've been using, we previously launched 22mW with no buffer (hence iss railed); now we only have to launch 15mW for the same opo transmitted power, with lots of buffers.

GAOM1 typically has ~90% throughput, e.g. previously this was 14.4mW out from 16mW incident. Today I first measured 25mW out for 44mW incident (~57%): this means >30% of power from SHG was clipping on the AOM apeture. After re-aligning GAOM1 using the mount screws, we're back up to 40mW out for 45mW incident, so almost 90% throughput again. I think this could be better, but good enough for now.

Relieving the clipping also significantly improved fiber coupling efficiency, presumably b/c it improves the mode shape, as we are using the 0-th order AOM mode for pump light, and not the nice diffracted order that gets cleaned up in the diffraction. So aom clipping shows up on the beam we are trying to fiber couple.
-- Before, for 20mW into the pump fiber, we had 1.8mW on OPO_REFL_DC_POWER on the other end, with GAOM1 driven at 2-3V (almost no room), and all power on that path going into the fiber (SHG_REJECTED = 0mW).
-- After, for 20mW into the pump fiber, we have 2.9mW on OPO_REFL_DC_POWER (60% higher power), with GAOM1 driven at 4.5V (mid-range), and a healthy buffer of rejected power on the fiber path (SHG_REJECTED = 8mW).