TITLE: 05/23 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Calibration sweep and then some commissioning time today. A lock loss ended a 26 hour lock. We then move the PR2 spot back to our previous position >8 days ago. We just finished that move and now Ryan is starting an alignment.
LOG:

• 1920 Back to Observing
• 2131 Lock loss                                               

TITLE: 05/23 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 22mph Gusts, 14mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY: H1 is currently down for some corrective spot position moves.

• Wind is moderately low and microseism is trending down
• All other systems nominal

Naoki, Karmeng, Andrei, Sheila

We did NLG sweep on DARM at NLG 16.9 (nominal) and 42. The IFO was locked for more than 20 hours and well thermalized. We also tried NLG of 65.9, but the squeezing level was not stable so we gave up this NLG. We will take the third NLG data tomorrow if IFO is thermalized. 

Previous NLG sweep on DARM: 73747

How to measure NLG: 76542

How to change NLG: 73801

Note:

• Requesting SQZ_MANAGER guardian from FDS to FIS does not work. We need to request DOWN and then request FIS.
• With NLG 42, as soon as the seed was injected, the pump ISS failed. We reduced ISS gain from 31dB to 21dB to avoid it.
• With NLG 65.9, reducing ISS gain did not help, so we measured NLG without pump ISS. We requested OPO guardian to LOCKED_CLF_DUAL_NO_ISS and adjusted the OPO trans by changing the drivepoint of ISS.

Lockloss @ 05/23 21:31 UTC

J. Kissel, T. Shaffer, J. Driggers

Joe Betz and Jenne Driggers spoke of increasing the calibration line heights that drive the ETMX actuation stages in the face of the elevated noise in the detector in the 10-20 Hz frequency region (LHO:77993). TJ caught me, pointed this out to me, so I've staged this change by editing
    - /opt/rtcds/userapps/release/isc/h1/guardian/lscparams.py (rev 27751 lines 481 - 484)
         here, I increased the gains on the calibration line oscillators
         STAGE       FROM      TO        FACTOR OF
         UIM / L1    6.6       15.0      ~2x
         PUM / L2    1.7        8.0      ~4x
         TST / L3    0.061      0.1      ~2x
    - /opt/rtcds/userapps/release/isc/h1/guardian/ISC_LOCK.py (rev 27729, lots of lines, where "CAL_LINE" appears in several states)
         here, as indicated in Louis' aLOGs where he's changed the line heights (e.g. LHO:71947), one *also* needs to change the correspond gains in the front-end calibration pipeline's demodulation of the lines. So I've added the following lines to the existing for loop that changes these gains
         for g in ['CLK','SIN','COS']:
            ezca['CAL-CS_TDEP_SUS_LINE1_COMPARISON_OSC_%sGAIN'%(g)] = (value)
            ezca['CAL-CS_TDEP_SUS_LINE2_COMPARISON_OSC_%sGAIN'%(g)] = (value)
            ezca['CAL-CS_TDEP_SUS_LINE3_COMPARISON_OSC_%sGAIN'%(g)] = (value)

Will load at our earliest convenience.

Wrapped up commissioning at 1920UTC and we are back to Observing. Locked for 23:39

I ran the A2L script again today, accepted the gain diffs for the 4 test masses. 

The script is still in ...userapps/isc/common/scripts/decoup/a2l_min_generic_LHO.py .  Some room for improvement is that it leaves several SDF diffs (TRAMPs on the 4 quads, and settings in the PIT7 and YAW7 ADS loops), so we should add into the script to revert those.

Attached is the printout of what the script measured, as well as a screenshot of the accepted a2l gain diffs.

Alex Ritzie, Ansel Neunzert

Key points

The 9.5 Hz comb triplet (LHO worst offender comb), 11.11 Hz comb, and 11.9 Hz comb, are present in {H1,L1}:PSL-ISS_PD{A,B}_REL_OUT_DQ. These combs were previously known to be common between the two sites (see LLO 70030, LLO 66036, git issue for 9.5 and 11.9 for more info). A near-30 Hz comb is also seen at LHO only.

Details

Plots of H1:PSL-ISS_PDA_REL_OUT_DQ and L1:PSL-ISS_PDA_REL_OUT_DQ are attached (figures 1 and 2). Note that the color coding differs between the two plots. The 9.5 Hz combs are much stronger at LLO than at LHO. The 11.9 Hz comb is almost not visible at LLO, but the first harmonic is faintly present (figure 3).

Note that the 9.5 Hz combs may not appear to line up exactly on this plot at higher frequencies, but they are known to shift around regularly and I'm just plotting the average O4a positions here. I'm confident that it's the same artifact because the characteristic triplet structure is clearly apparent at every peak (see figures 4 and 5).

Both of these plots are from May 6. This date is not special, it's just a convenient recent date with a reasonable amount of observing time, which avoids other recent comb contamination issues at LLO.

Methods & context

Alex has been building an improved version of the STAMP-PEM / Fscan comb comparison tool first mentioned in this alog. Essentially, this tool leverages the relatively low-resolution but much larger channel set of STAMP-PEM's coherence data to try to pick out possible new witness channels for combs identified by Fscans. Alex's results for Hanford December 30-31 2023 are attached in figure 6 (more recent STAMP-PEM data was not yet available). This reproduces prior results showing the combs in IMC WFS channels, and highlights several other channels. Following up with high-resolution Fscan spectra, I found that the PSL accelerometers which appear on the heatmap show some broad peaks in the vicinity of some comb frequencies, but are not a match to the combs at high resolution (probably unsurprisingly) so I moved on to looking at the channel mentioned above, and from there to looking at the corresponding LLO data.

I have opened a git issue here https://git.ligo.org/detchar/detchar-requests/-/issues/243 with notes on next steps & follow up; additional input welcome.

Thu May 23 10:09:29 2024 INFO: Fill completed in 9min 25secs

Similar to what we've been seeing:

• CHARD P has coherence from 18-26Hz
• A bit with DHARD Y <13.5Hz
• Some MICH, PRCL, SRCL  from ~12-16
  • I've put in seperate screenshots for each of these since it gets a bit crowded in that template and only started to look at lower frequencies.
• Jitter seems worse in particular for IMC WFS B Y

Famis 26302 - HVAC Vibrometer HVAC fan check

There was a small stange looking increase on the May 19th at 16:00 UTC that lasted about 16 hours on H0:VAC-MR_FAN6_170_1_ACC_INCHSEC.
 

Ran a calibration broadband and simulines measurement at 1530UTC and coordinated with LLO and Virgo.

Simulines start:

PDT: 2024-05-23 08:37:24.653206 PDT
UTC: 2024-05-23 15:37:24.653206 UTC
GPS: 1400513862.653206
 

End:

2024-05-23 15:58:54,982 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20240523
T153725Z.hdf5
2024-05-23 15:58:54,989 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20
240523T153725Z.hdf5
2024-05-23 15:58:54,994 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20
240523T153725Z.hdf5
2024-05-23 15:58:54,999 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20
240523T153725Z.hdf5
2024-05-23 15:58:55,005 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20
240523T153725Z.hdf5
ICE default IO error handler doing an exit(), pid = 977458, errno = 32
PDT: 2024-05-23 08:58:55.069485 PDT
UTC: 2024-05-23 15:58:55.069485 UTC
GPS: 1400515153.069485
 

Famis 26242 PSL Status Weekly Report

Laser Status:
    NPRO output power is 1.819W (nominal ~2W)
    AMP1 output power is 66.77W (nominal ~70W)
    AMP2 output power is 137.6W (nominal 135-140W)
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 50 days, 21 hr 23 minutes
    Reflected power = 19.39W
    Transmitted power = 107.2W
    PowerSum = 126.5W

FSS:
    It has been locked for 0 days 20 hr and 48 min
    TPD[V] = 0.9001V

ISS:
    The diffracted power is around 2.2%
    Last saturation event was 0 days 20 hours and 48 minutes ago

Possible Issues:
    PMC reflected power is high

Started well pump to replenish fire water tank. Pump will run for 4 hours.

[Jenne, Joe B]

Jenne mentioned last night that the calibrated range seemed to jump last night, and was worried the line heights need to be increased.

Turns out she was correct.  We have a threshold of 0.01 on our uncertainty calculations for the front end uncertainty calculations which gate the GDS pipeline's accepting or rejecting current time dependent correction factors.

Looking at the summary pages, for the last hour or so of May 22nd and the first half of May 23rd, I can see the PUM real and imaginary components as reported by GDS (red lines) being stuck at a value for a while, then the uncertainty drops briefly, then updates, then freezes again.

Unfortunately, because UIM, PUM and TST are used to correct the kappa_C and F_CC (optical gain and cavity pole) calculations, those 2 calculations also stop updating, although they seem to be closer the raw values (grey lines) on those pages.

I've included trends of the low frequency line uncertainties, and I can clearly see the PUM line crossing the 0.01 several times in the last 10 days or so.  I also took a quick look at a quiet time spectrum versus a recent spectrum, and there may be a bump at 16.5 Hz causing a problem for the PUM line.

At a minimum I'd suggest raising the PUM line amplitude by more than a factor of 2 (trend is nearly touching 0.02, factor of two would drop it only to 0.01).  I'd probably suggest a factor of 4.  UIM also looks like it is kinda close, so I'd recommend raising that by a factor of 2.

The channels which control the suspension line heights are H1:SUS-ETMX_{L1,L2,L3}_CAL_LINE_CLKGAIN, where the usual L1=UIM, L2=PUM, L3=TST applies. 

We should consider setting up a monitor that alerts the operator when this kind of condition occurs, similar to what LLO has set up (although we've gone a step further where we automatically increase the line height in these kinds of conditions after an hour).  See Vlad's LLO alog 71177

TITLE: 05/23 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 145Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 2mph Gusts, 0mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.11 μm/s
QUICK SUMMARY: Locked for 19 hours, range has been slowly decreasing over the last 10 hours. Commissioning time and a calibration measurement planned for today 830-12PT.

TITLE: 05/23 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Very quiet shift tonight. H1 remained locked and observing the whole time, lock stretch currently up to 12.5 hours. Wind has died down and microseism is starting to drop.
LOG: No log for this shift.

Since we are considering reverting the PR2 spot move, I measured the spot positions by adjusting A2L gains for PR2, PRM, and PR3.  The first attached screenshot shows the current sliders and pico position, the second screenshot shows the A2L gains in SDF.