We are Observing at 158 Mpc and have been Locked for 20.5 hours. Wind has been picking up and is ~25mph at the corner station. Everything is going well.

Sun Jun 02 10:08:03 2024 INFO: Fill completed in 7min 59secs

TITLE: 06/02 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 2mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:

Observing and have been Locked for 15.5 hours. There's the back end of a small local earthquake coming through, but we're getting through it fine.

TITLE: 06/02 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY: Quiet shift, a small EQ and the winds were rising in the last few hours. We've been locked for just over 9 hours.

22:57 UTC Observing

23:10 UTC supereventS240601co

We've been locked for 4:30, the wind has been picking up over the past hour which is bleeding into the 0.03 - 0.1 Hz bandwidth.

TITLE: 06/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:  Pretty quiet day with a lockloss that was easy to recover from.
LOG:

14:30 Detector Observing and Locked for 10 mins
15:16 Took us out of Observing to try and optimize sqz (new OPTICALIGN offsets accepted in SDF) (tagging SQZ)
15:24 Back into Observing

18:30 Left Observing to run calibration
19:00 Back to Observing

21:51 Lockloss
    - Needed to intervene to help catch ALSY
22:54 NOMINAL_LOW_NOISE
22:57 Observing

Sheila, Ryan S, Oli

We spent some time yesterday looking at the 05/31 16:45 UTC lockloss, which was caused by a couple of large earthquakes. As the ground started moving more and we got closer to losing lock, DIAG_MAIN was telling us that IMC-REFL_SERVO_SPLITMON was close to saturating (>8V), and we also got some SRM saturations. We wanted to look into what the actual cause of the lockloss was (we weren''t able to confirm that) and see if we could change anything wrt the SRM control loops or IMC SPLITMON in order to make the detector more robust against earthquakes.

We first looked at the length, pitch, and yaw of SRM M3 DRIVEALIGN to see which of the three was contributing the most drive during the earthquake (attachment1). All three have a frequency of around 57mHz. Multiplying the max L/P/Y DRIVEALIGN values reached right before the lockloss by their respective EUL2OSEM values, we find that L was 100,000, P was 52,380, and Y was 7,333, so we will want to offload some of the driving on L.

We also looked into the saturations in IMC-REFL_SERVO_SPLITMON that occured prior to the lockloss (attachment2, attachment3). The IMC-REFL_SERVO_SPLITMON trace shows it saturating multiple times, with the saturations sometimes lasting as long as 3 seconds. We compared SPLITMON to some other relevant channels - I can''t explain why these other channels are relavent, but Sheila said that we might want to talk to Daniel about reducing the load on IMC-REFL_SERVO_SPLITMON.

I looked into how often SPLITMON saturations seem to occur, and they almost exclusively happen when we have high ground motion from earthquakes or wind(attachment4). I found that there have only been two of these ground motion SPLITMON locklosses in O4b (05/14 and 05/31), but before O4b there were many more, usually more than one per month and mostly seen in clumps. I also checked which of these locklosses from the beginning of O4 were accompanied by SRM saturations, and was only able to find 7, with yesterday's being the only one this year.

Ground motion + SPLITMON + SRM saturations during O4 so far:
2023-06-16 11:48 UTC
2023-10-02 00:54 UTC
2023-10-07 08:16 UTC
2023-10-11 01:43 UTC
2023-10-15 04:38 UTC
2023-10-16 03:18 UTC
2024-05-31 16:45 UTC

TITLE: 06/01 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 7mph Gusts, 5mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY:

• We just relocked and returned to observing at 22:57UTC
• Everything looks stable

Lockloss @ 06/01 21:51 UTC from unknown cause

We're Observing at 155 Mpc and have been Locked for 6 hours now. Nothing else to note

Terry, Kar Meng

The cavity finesse, beam profile and power transmitted through the crystal seem fine. The conversion efficiency however still needs a bit of attention. At the moment it is almost 30% at 60mW. An extra 5 - 10% would be good. I suspect the phase matching temperature is not quite optimised. I'll lfine tune it Monday.

Calibration was run between 06/01/2024 18:30 - UTC. Forgot to take a ss before starting calibration so I've attached one from time machine. We had been Locked for 4 hrs 7 mins when we started running calibration.

Broadband

Started: 2024/06/01 18:30:35 UTC

Finished: 2024/06/01 18:35:47 UTC

Output file: /ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20240601T183035Z.xml

Simulines

Started: 2024/06/01 18:37:04 UTC

Finished: 2024/06/01 18:58:34 UTC

Output files:

/ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20240601T183705Z.hdf5
/ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20240601T183705Z.hdf5
/ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20240601T183705Z.hdf5
/ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20240601T183705Z.hdf5
/ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20240601T183705Z.hdf5

We went into commissioning at 18:30 UTC to do our Saturday calibration sweep

Closes FAMIS#26246, last checked 78062

Everything looking good besides the known high PMC refl

Laser Status:
    NPRO output power is 1.817W (nominal ~2W)
    AMP1 output power is 67.04W (nominal ~70W)
    AMP2 output power is 137.9W (nominal 135-140W)
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 4 days, 0 hr 2 minutes
    Reflected power = 21.04W
    Transmitted power = 106.6W
    PowerSum = 127.6W

FSS:
    It has been locked for 0 days 4 hr and 43 min
    TPD[V] = 0.8871V

ISS:
    The diffracted power is around 2.3%
    Last saturation event was 0 days 4 hours and 43 minutes ago

Possible Issues:
    PMC reflected power is high

Sat Jun 01 10:09:30 2024 INFO: Fill completed in 9min 27secs

TITLE: 06/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 3mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.07 μm/s
QUICK SUMMARY:

We're Observing and have been Locked for 10 mins. Everything looking good

TITLE: 06/01 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY: 1 lockloss from an EQ, IA to relock. We've been locked for just over 4:30

23:31 UTC The SQZer lost lock and dropped us out of Observing until 23:36 UTC

01:49 UTC Another EQ lockloss, this time a 5.6 from Tibet

02:16 UTC After a few rounds of bad PRMI to CHECK_MICH I dropped down to do an IA

03:24 UTC back to observing

03:22 UTC we went into EQ mode from a false signal on the HWUT seismometer, as we've seen before alog77554 (SEI). We transitioned back after 10 minutes, this happened a second time at 03:54 from the same seismometer

06:13 UTC superevent S240601aj

I've attached the two most recent builds (3 & 4s) TF model comparison. The R to R looks better, V still has the extra peak just below 1 Hz.