I took advantage of the recent earthquake to tweak the beam alignment into the FSS RefCav from the Control Room to improve the transmission, which had been dropping for the last several days.  With the IMC unlocked the starting RefCav TPD was ~0.660 V, and after the alignment tweak (IMC still unlocked) the TPD is ~0.833 V.

17:42 UTC lockloss from a 6.6 from Cape Verde, holding in down till the motion subsides.

Fri Mar 28 10:13:33 2025 INFO: Fill completed in 13min 29secs

Gerardo confirmed a good fill curbside. Note TC adjustments during fill when ice was being removed.

Sheila, Camilla

• Turn off SQZ ASC with H1:SQZ-ASC_WFS_SWITCH and check the SQA_ANG_SERVO isn't running once you get to FDS or FIS.
  • If you go ot no SQZ and back to FDS/FIS, need to turn off again.

Data to take and how each data is used in the model:

• No SQZ (for subtraction in models)
  • Good time to measure NLG (as in 76542) and change NLG if wanted
• Mean SQZ with ADF off (for loss calculation in models)
  • Go to FIS with SQZ_MANAGER and then take SQZ_OPO_LR guardian to DOWN
• FIS Mid SQZ +/- (for SRC de-tuning in models)
  • Try to match high frequency SQZ to No SQZ level by increasing and decreasing SQZ angle from nominal SQZ.
• FI ASQZ (for homodyne angle in models)
  • Also +/- 10deg each side of nominal
• FDS Mid SQZ +/- (for FC de-tuning)
• FDS and FIS SQZ (because we want to see how good DARM can be)
  • Maybe also +/- 10deg each isde of nominal

Closes FAMIS26379
Laser Status:
    NPRO output power is 1.864W
    AMP1 output power is 70.39W
    AMP2 output power is 140.2W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 51 days, 18 hr 58 minutes
    Reflected power = 22.69W
    Transmitted power = 106.0W
    PowerSum = 128.7W

FSS:
    It has been locked for 0 days 0 hr and 59 min
    TPD[V] = 0.662V

ISS:
    The diffracted power is around 4.2%
    Last saturation event was 0 days 8 hours and 41 minutes ago

Possible Issues:
    FSS TPD is low

TITLE: 03/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 7mph Gusts, 6mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.50 μm/s
QUICK SUMMARY:

• There was a large EQ ~ 8 hours ago
• We just had a LOWNOISE_ESD_ETMX lockloss
• Wind is low, secondary microseism is just at the 90th percentile

H1 called for assistance at 07:13 UTC when ISIs tripped for every QUAD, BS, and HAM8 due to a M7.7 earthquake and M6.4 aftershock out of Myanmar. Lockloss happened earlier at 06:33 UTC because of the S-waves of this quake, I'm assuming. At the worst of the shaking, peakmon was at the highest I can recall seeing it at over 128,000 counts.

H1 will be down for a while. I'll check in after a bit and untrip platforms if the shaking has calmed enough and start locking.

Follow up to LHO alog 83200 and LHO alog 80863.

Brian and I thought of a better way of getting the M1 OSEMs in PR3 calibrated relative to the HAM2 GS13s: Use the ISI drives in L, T, V for frequencies above the suspension resonances to get an absolute calibration.

We can use the measurements Jeff took in LHO alog 80863 and project them in the OSEM basis, then use the translational (Longitudinal, Transverse, Vertical) drives to calibrate the OSEMs. Since the GS13s are calibrated to [m] all of the transfer functions (shown in the first attachment) are in [OSEM meters]/[GS13 meters]. At high frequencies (sufficiently above the resonances) the OSEMs should just be measuring (-1)*ISI motion, because the suspension is isolated. The calibration error will depend on how well we are able to drive L,T,V from the ISI without cross-coupling to any other DOF.

Figure 1 attached shows the 6x6 transfer matrix between the ISI drives and OSEMs (inputs are columns, and outputs are rows). We highlight the 6 translational transfer functions that can be used to calibrate the OSEMs in red. The drives seem decoupled enough to do the calibration (for example, we expect to see a length drive only in LF and RT, no motion anywhere else).

Figures 2,3, and 4 show a detail of the 6 transfer functions we will use for calibration, all of them should be scaled to 1 [OSEM m]/[GS13 m]. The scalings are:

TITLE: 03/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Just got to NLN and into Observing. When trying to relock earlier, we did have a lockloss from DHARD_WFS for some reason, but no issues after that. The wind is currently low but has had a couple instances of quickly spiking up above 20/25mph before dying back down, the second of which came with very heavy rain. Hopefully that doesn't happen again during the night. The secondary microseism is still very high, but doesn't look to be getting worse.
LOG:

23:30 Relocking and in OMC_WHITENING damping violins

00:33 NOMINAL_LOW_NOISE
00:34 Observing

03:03 Lockloss
    - Lost lock at DHARD WFS
    - Ran an initial alignment

05:06 NOMINAL_LOW_NOISE

05:07 Observing

Lockloss @ 03/28 03:03UTC after 2.5 hours locked. Of course right after I put in my midshift report saying that we were locked

Observing at 155Mpc and have been Locked for 2.5 hours. Nothing to report

TITLE: 03/27 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Microseism
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Calibration and commissioning started the day. After a lock loss at 12PT we have been struggling to relock. We just recently made it to the last state before low noise, but the violins are very high from a few lock losses at Transition_From_ETMX and Move_Spots. Oli is damping those now and hopefully we'll be back to observing soon. It's not entirely clear why we had issues relocking. The primary and secondary useism are definitely elevated, but at levels that we have locked before. Wind is under 20mph, as well.
LOG:

• 1810, 1815, 1818, 1832 HAM7 WD tripped when squeezing was turned off
• 1900 Lock loss                                                                                                                                                                                                                                                                             

The Kepco Power Supply for SUS-C4 started chirping at the end of maintenance today.  By 2pm the chirping is more regular.  The draw on the supply is 7A, typical failing fans last a few days once they get to this stage.  We should replace this one before the weekend, as a target of opportunity.  Down time will be 30 mins start to finish.

WP12406

M. Pirello, F. Clara