Lockloss @ 06/16 00:01UTC (LDAS currently down so no link). We had only been locked for 20 minutes and I was trying to get the SQZ OPO to lock, so we had not been in Observing. There was a small jump up in wind at that time, but not sure if that would have caused the LL

TITLE: 06/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Wind
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

IFO is in and is locking at LOWNOISE_COIL_DRIVERS

Wind gusts have been high since the last lockloss and per usual, I would put H1 in down when the wind would go higher than 30mph and wait for oppurtunistic low-wind periods to lock ALS - here's a timeline since the last LL. The only sdf revert I had to accept was in my midshift alog 78457

All times are UTC

19:31 - NLN/Observing Lockloss

19:38 - ALS Lockloss

19:39 - DOWN due to 40-50mph winds

21:43 - Attempt to re-lock due to wind speeds below 30mph

22:08 - Two failures at MICH_FRINGES and no ability to lock PRMI let alone DRMI - decied to run initial alignment

22:25 - Initial Alignment done fully auto, attempt to relock - winds picking up about to surpass 30mph

22:41 - DOWN again after 2 ALS locklosses and 3 IR Locklosses, with winds around 35mph.

22:54 - Saw small oppurtunistic sub 30mph calmness (that only lasted 10 mins) and decided to try locking again - it worked!

23:02 - DRMI locked!

23:30 - Shift ended while in LOWNOISE_COIL_DRIVERS

LOG:

None

TITLE: 06/15 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Wind
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 28mph Gusts, 21mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY: Relocking and at DARM_TO_RF

IFO is in NLN and OBSERVING as of 18:29 UTC

We lost lock 2 hours after reaching observing at 16:56 UTC due to unknown reasons. The range was definitely lower than usual and while I was attempting to investigate this using Sheila and TJ's new wiki low range checks page, we had our initial lockloss. SDF Table of acceptances is attached.

After PRMI failed, I ran an initial alignment and then we locked swiftly despite winds in the high 20's and low 30's (mph). The range is still quite low now but I will wait the recommended hour or two (per Sheila's instruction) until IFO is thermalized enough to run the low range check dtt.

Wind forecast show gusts are expected to continue picking up until around 4PM so here's hoping we don't need to lock ALS during that time!

Sat Jun 15 10:10:28 2024 INFO: Fill completed in 10min 25secs

TITLE: 06/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 19mph Gusts, 15mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:

IFO is LOCKING at MOVE_SPOTS

IFO was mid auto relock from its last lockloss at 12:56 UTC when I arrived. Expect to get locked and observing soon.

HAM4 annulus ion pump signal railed about 7:50 utc 06/15/2024.  No immediate attention is required, per trend of PT120, an adjecent gauge, the internal pressure does not appear to be affected.  HAM4 AIP will be assesed next Tuesday.

TITLE: 06/15 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: We are Observing at 150 Mpc and have been locked for 13 hours now. Super quiet shift with no issues.
LOG:

23:00 Detector Observing and Locked for over 4 hours                                                                                                                                                                                                                                                                                                

We are Observing at 154 Mpc and have been Locked for over 9 hours. Nothing to note

We continue the activities with the experimental vacuum chamber in the Mechanical Room, along the Eastern-wall. Now we are running another scroll pump there. Similarly to the already running one, a foam is placed underneath it.
In the meantime, the bakeout of this chamber's RGA has been finished.

TITLE: 06/14 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 21:33 UTC.

21:07 UTC to 21:33 UTC: COMISSIONING

19:28 UTC to 21:07 UTC: OBSERVING

Things of note:

• Sheila, Camilla and I investigated SRCL FF mistuning that showed up on the low range checks - alog 78441 - this was our 30 mins of comissioning that improved the mistuning (as shown in the alog). All in all, an LSC SRC Offset was changed - SDF Diff below.
• A2l script was edited, used and SDF diffs were accepted (and some reverted). This is documented in both alog 78439 (midshift update) and alog 78438.
• ISC_LOCK was also loaded while OBSERVING after changes were made so we dropped in and out of observing briefly (4 seconds) due to that.
• ITMY CPS Glitch occured at 22:46 UTC - first time I've seen this.
• Hanford Fire Dept. visited and asked to go down the arms, to which I refused since we were in Observing. They went to the kitchen patio area, turned around, then left.

LOG:

TITLE: 06/14 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 3mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY:

Detector Observing and has been locked for over 4 hours. Range isn't great, around 148 MPc, but besides that everything is good.

I looked at the SUS-{SR2,SR3,SRM_M1_DAMP_{P,Y}_INMON channels for a period on the 21st April before the OFI, and after we had re-aligned through the OFI to rcover our optical gain on the 25th April after the OFI burn.

I have compared these to the drift in alignment in the signal extraction cavity yesterday. This is partly to figure out why we have to keep retuning our SRCL feedfoward.

The only angular degrees of freedom that changed significantly between these dates were:

• SR3 yaw which was changing during lock about 6 times its normal drift on the 25th vewrsus how much it changed during the lock on the 21st. Yesterday its drfit during lock seems back to its value before the OFI burn.
• SRM pitch drift seems to vary a lot between these three different locks. Not sure what we can learn from this.

Woke up to see that the SQZ_OPO_LR Guardian had the message:

"disabled pump iss after 10 locklosses. Reset SQZ-OPO_ISS_LIMITCOUNT to clear message"

Followed 73053, but did NOT need to touch up the OPO temp (it was already at its max value); then took SQZ Manager back to FRE_DEP_SQZ, and H1 went back to OBSERVING.

Following on from Sheila's alog 77427, checked on VAC trends and OFI temperature around April 22nd.

I checked (maybe a repeat of someone else) that there were no vacuum spikes during the locks when Kappa_C dropped or the locklosses afterwards. Plot of Kappa_ C with VAC channels attached.

Looking at the OFI TEC readbacks during that time, they were significantly noisier than usual during Tuesday maintenance after the 5% optical gain drop, before out alignment shift.  Noisy between 6:30am and 4pm. This is before any Tuesday maintenance 77363 or injections start. Plot attached, including zoom out and zoom in. It also happened the May 28th to May 30th.

Today Dripta and I went to EY and did what would have previously call a standard ES measurement with PS4.

And We also employed the new End Station procedure.

Details and analysis ccoming in a comment to this alog.

In the observing stretch that started Monday around 8 pm, there was a drop in optical gain (by 4%), and power at AS port PDs (4% drop in AS_A sum, AS_B sum, AS_C sum, and OMC REFL).  There not at that time any change in circulating power in the arms, PRG, coupled cavity pole, or alignment of suspensions (shown are SR2, SRM, OM1+2, but we have also looked at many other suspension, ISI and HEPI related channels for this time 77382 ).  This time is shown by the first vertical cursor in the attachment. 

We were unable to relock the interferometer after that Monday evening lock (a new lockloss type appeared early Tuesday morning, 77359), and after the maintence window we were uable to lock with difficulties powering up (77363) and an AS camera imagine that had lobes whenever the beam was well centered on AS_C.  We locked that evening by adding large offsets to AS_C's set point, (77368).  This is the cause of the large alignment shifts seen in the screenshot on Tuesday evening to Wed morning, which allowed us to lock the IFO but created a large scatter shelf and resulted in a lower coupled cavity pole, and lower optical gain, and we did not have much squeezing that night. 

We do not think that Tuesday maintence activities are the cause of our problems, although some of the Tuesday work has been reverted (77350 77369).

Yesterday we spent much of the day with SRY locked, single bounce or using the squeezer beam reflected off SRM to investigate our AS port alignment.  77392, We are able to recover the same throughput of a single bounce beam to HAM6 by moving the alignment of SR2 + SR3 by a huge amount 77388, which also produced a round looking beam on the AS camera.  We haven't since tried to explore this aperture, to see if we could have also recovered this thoughput with a pitch move, for example.  We also saw that the squeezer beam does not arrive in HAM6 with a good transmission when injected with the alignment used previously, but that we could recover good transmission to HAM6 by moving ZM5 by 150-200 urad, in pitch or yaw.   With this shift in SRC axis, and squeezer alignment we were able to relock and not have the large scattering issues we had Tuesday night.

Today's time was spent recovering from a seemingly unrelated problem in the SQZ racks, and some commissoning aimed at recovering our previous (165Mpc) sensitivity with this new alignment.  This will continue during tomorow's commissoning time.

additional related information:

• (no SQZ, HWS, OFI voltmons)  77374
• Move of SQZ beam in lock to get squeezing: 77400
• OFI transfer functions: 77391
• other suspension health checks: 77383
• dark offset script: 77362
• SRM and SR2 beam positions after the shift: 77443
• Further look at powers on HAM6 PDs: 77441
• AS port fringe wrapping worse than Summer 2023: 77452