TITLE: 04/15 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: SEISMON_ALERT
    Wind: 10mph Gusts, 5mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.15 μm/s
QUICK SUMMARY:

Nicely Observing H1 handed off by RyanC.  He mentioned, same issue with SRC for alignment and needing to skip it (that's atleast 3x in a row).  He also mentioned a drop out of Observing due to SQZ_FC as observed last night (and tweaks Naoki made for this).  Currently, waiting for a M5.9 S.Korea earthquake to roll through with its R-wave in 10min.

TITLE: 04/15 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: We stayed locked the whole shift after locking.

The wind started to pickup in the early afternoon, gust over 30mph

Lock#1

Found the IFO in IA, stuck at SRY. I adjusted SRM to maximise the spot on AS AIR then got out of IA and was able to lock. It took a few tries, ALS was getting knocked out by the wind possibly.

• 16:10 - 19:27 UTC Observing
  • We dropped observing briefly when the FC lost lock, it relocked itself
• 19:29 - 21:36 UTC Observing
  • Naoki adjusted the SQZ angle to maximize squeezing, alog77180
  • The SQZer lost lock again, returned to OBS after it relocked itself
• 21:38 - 23:00 UTC Observing

LOG:

Jeff K, Sheila D

We are interested in which signals we can use to try to damp triple bounce and roll modes, since these are probably responsible for some of the peaks in our forest of peaks around 25-35Hz (77109 and 76505).  Jeff is preparing to implement a damping path on the HSTSs so that we can try to damp these. 

We looked at signals (in addition to DARM) that we may want as options for damping. 

• 27.42 Hz - REFL A 9I PIT
• 27.5 Hz -nothing other than DARM
• 27.6 Hz - REFL A 45I yaw (plus several LSC signals, PRCL, SRCL, REFL45 I, POP9Q)
• 27.72 Hz nothing but DARM
• 28.2 Hz PRCL, LSC REFL45 I, ASC REFL A 9I pit, ASC REFL A 45 I yaw

Dtt template is at /ligo/home/sheila.dwyer/SUS/HSTS_damping_signals_checks.xml

FranciscoL, RickS

On April 4, 2024 we used DTT to measure the amplitudes of the Pcal lines used in the Pcal X/Y calibration comparison in both the Pcal end station Rx sensor outputs and the DARM_ERR signal.  The attached plots shows the peaks in the spectra measured with 0.001 Hz requested BW, 50% overlap, 10 averages during a long lock stretch.  The second image is a page from Francisco's lab book.

The SNRs for the lines from the Pcal Rx sensors is about 5e-5 and

the SNRs of the lines in the DARM_ERR signal are about 1350.

Since the sqz angle seemed not optimized and range was below 160 Mpc in this lock, I tuned the sqz angle during observing after 4 hours into lock. The attachment shows that sqz and range improved with sqz angle at 200. The previous sqz angle was 192 and it was set just after the lock in 77144.

We've been locked for 3 hours, in observing since 16:10 UTC. SQZing has been getting better as we thermalize.

FAMIS 20024

Jason adjusted the pump diode currents last Tuesday (alog77048), which is seen on the laser trends and resulting drop in PMC reflected power on the stabilization trends. FSS TPD signal also took a drop over the weekend; will keep an eye on it.

Mon Apr 15 10:14:42 2024 INFO: Fill completed in 14min 38secs

Jordan confirmed a good fill curbside.

The Lockloss tool hasn't updated with any of the Locklosses since 4-13-24 12:49UTC

TITLE: 04/15 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Aligning
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 11mph Gusts, 8mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.13 μm/s
QUICK SUMMARY:

• Currently in IA following a LL at 13:46UTC
• ITMY camera is blue?
• A little windy out, EX is seeing gusts up to 20mph, and EY up to 30mph

TITLE: 04/14 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Earthquake
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

A bit of a rough shift with a rumbling planet for the first half of the shift.  Wind storm (20-30mph) for 4hrs of the shift.  Mid-shift marked by beginning of FC IR-locking issues for Squeezer.  And also had issues with SRC portion of alignment for 2-alignments from the night.  

If SQZ_FC unlocks, we should transition to NLN + NO SQUEEZING (via procedure in wiki).
LOG:

• 2311 H1 back to OBSERVING post M6.5 S.Pacific EQ (TJ reported no issues coming back up)
• 2320 EQ mode activated
• 2323 Lockloss (we were starting to ride another seismic peak in the EQ-band, but not clear where/what EQ it is; also have a noisy picket fence).
• Locking Notes:  DRMI locklosses had  POP18 get noisier while ASC comes on, and so went for CHECK MICH & PRMI.
  • 0008-0108 Initial Alignment started
  • Not able to complete SRC OFFLOADED (could not get SRY to acquire even with AS_C pd centering and tweaking SR2 & SRM).
  • Skipped SRC OFFLOADED
  • Returned to locking and got through DRMI ASC  & made it back to NLN
• ~0130 Winds take a fast and dramatic step up in speeds (for about 4hrs)
• 0155 H1 back to Observing
• 0242 Out of Observing due to Squeezer Issues  (contacted Naoki & Vicky also looking into it).  Had a couple of cycles in/out of Observing due to Squeezer, and then...
• 0303 LOCKLOSS
• Locking Notes:  Several locklosses at early stages of Locking, so from 0348-0420, started another Initial Alignment (had to skip SRC_OFFLOADED for a 2nd time in a row).
• 0503 NLN + SQZ work by Naoki & Vicky continues
• 0559 OBSERVING  (with SQZ_FC getting locked at 0545)

Vicky, Naoki

In the last lock, the FC IR kept unlocking. We first thought the timer issue similar to 76280 so we removed the timer, but it did not help. We checked the FC IR OLG and it was fine. Then we found that the FC ASC input signal moved a lot. We turned off FC ASC and the stability was improved. We decided to go to observe without FC ASC tonight. 

Jennie W, Sheila, Jenne

We did steps of 1 up in PITCH for camera offset servo 2 which controls the beam spot on ETMX by moving ITMX and ETMX, as suggested by this overnight test Camilla  and I did.

This improved the build-ups and we went past the optimum point which we found to be CAM_PIT2_OFFSET = -173, so we set the offset to this. The optimum point is shown by the right most cursor in this image.

We did steps of 1 up in YAW for camera offset servo 3 which controls the beam spot on ETMY by moving ITMY and ETMY, as suggested by this overnight test Camilla  and I did.

This improved the build-ups and we went past the optimum point which we found to be CAM_YAW3_OFFSET = -349.5, so we set the offset to this. The optimum point is shown by the right most cursor in this image. There was confusion as the PITCH and YAW degrees are cross-coupled (this confused us as one must wait for the pitch servo to converge while changing the yaw degree of freedom).

We then tried to optimise our last DOF for the camera servos: PITCH for servo 3. We first moved the offset up and then down, but made the build-ups worse each time. By this point we had increased thje gain of the camera servo filter banks by 2 to speed up the converging. CAM_PIT3_OFFSET should be set to its nominal at -230 counts.

Then we ran the A2L gain scripts we used the other day successfully to optimise thse loops to match the new arm alignment. During running of this script we lost lock, not sure why.

We did not add these new offsets to the guardian because of the lock loss, we will do them together with the A2L optimisation during the nest commissioning period.

The A2L script is is userapps/isc/h1/scripts and is called run_all_a2l.sh

DARM Offset Test:

Test was run without issues and upon checking the PCAL X and Y Excitation screens, the only differences I can see before vs. after are in the OSC_TRAMP Times:

PCALX: OSC TRAMP (sec) OSC1 was 3 and went to 5

PCALY: OSC TRAMP (sec) OSC1-9 were 10 and went to 5.

I reverted these to their before values - everything else is the same (screenshots below).