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.

State of H1: Observing at 155Mpc

Quiet evening here so far; H1 has been locked and observing for 8 hours.

TITLE: 05/22 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: 3 locklosses today, relocking was straightforward, we've been locked for ~4 hours.

14:20 UTC lockloss, there was a ~13 Hz oscillation in SRCL, PRCL, and DARM

16:02 UTC  back to Observing after some SQZer aligning

16:16 UTC lockloss, similar as earlier, ~13 Hz oscillation right before LL

Sheila removed a DARM filter alog77983

17:20 UTC back to Observing

18:37 UTC lockloss

The alignment seems to be degrading after each LL, DRMI/PRMI flashes are worse each time. I had to move PRM 15 microradians in pitch to help PRMI seeing AS AIR camera clearly pitched. On to DRMI AS AIR looks yawed now but the flashes are much better post ASC

Sheila measured the PR2 spot once we got close to NLN alog77988

22:19 I saw a DIAG_MAIN message "PMC PZT volts high"  and shortly after the SQZer lost lock and dropped us out of Observing

I ran an alignment and angle scan to optimize squeezing after it relocked itself (SDF diffs) since we were already out of observing and I was just thinking that SQZing wasn't looking great at high frequency, the trace on nuc33 didn't look much different after finishing and DARMs noise still looks elevated at high and low frequencies but the range seems to have increased by a few Mpcs.

22:32 UTC back to Observing

LOG:                                                                                                                                                                        

TITLE: 05/22 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 11mph Gusts, 8mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.18 μm/s
QUICK SUMMARY: H1 has been locked and observing for 3.5 hours.

• Light rain and some wind on site
• Microseism has been on the rise over the last 12 hours
• All other systems nominal

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. 

https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1400438280

We've had some difficulty with turning off the mad hatter boost (DARM1 FM2) in the new DARM state, 77640 and this is probably also the problem Tony was encountering in 77956. 

This is a boost that was turned on in the DARM_OFFSET state and then turned off again in LOWNOISE_ESD_ETMX.  Today I commented out the boost turning on, since it may not be necessary.

We locked in fairly windy conditions like this, with wind speeds up to 25mph.

The first attachment shows how H1's range has degraded over the last week, with the first incident of poor range happening before we started to move PR3.

It seems that there are mulitple issues.  The squeezer seems to be intermittently adding low frequency noise, see 77969 and 77888.  This morning I repeated the squeezer on / off test and see that the low frequency noise is worse than May 8th now but isn't from the squeezer.  The low frequency noise could be explained by the PRCL coherence, which is higher than either SRCL or MICH coherence.   (Similar to what Camilla saw last night 77976). 

Looking at the trend of the range with PR3 alignment, it does seem that the nonstationarity is present when we have PR3 moved, and mostly gone when it is in the original position.  There was one incident of low range right before the move, which seemed related to anthropogenic ground motion.  The range dips at times when PR3 is moved do not seem related to the ground motion. 

This morning I made an attempt to move the squeezer alignment to see if this would help with the low frequency noise.  I put a length excitation on ZM5, and increased the amplitude until I saw fringe wrapping in DARM.  This template is saved in useraps/sqz/h1/Templates/dtt/DARM_scatter_bad.xml  I moved ZM5 - 47urad in yaw, and saw that this reduced the amplitude of the scatter shelf (screenshot).  Once I ran the SCAN_ALIGNMENT script which adjusted ZM4+6 to reoptimize the squeezing, the shelf height was mostly back to it's original.  I've left the squeezer in this new alignment, but I'm not sure it's worth pursuing this until a time when the intermittent squeezer problem is happening.

Wed May 22 10:08:52 2024 INFO: Fill completed in 8min 48secs
Gerardo confirmed a good fill curbside.

TITLE: 05/22 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: 21mph Gusts, 17mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.14 μm/s
QUICK SUMMARY:

• 14:20 UTC lockloss, likely from the wind
• The wind is starting to pick up

We need to reduce the DHARD rms to make our SRCL to darm coupling more stationary, (77729 77666) I ran a noise injection to measure the DHARD P loop this morning.

Elenna measured the hard loops and compared them to a model while we had 430kW in the arms in 69597, today's measurement is with 375kW. I used a template I found in userapps/h1/asc/templates/DHARD/DHARD_P_broadband_excitation.xml, which I think is the one that Elenna tuned in 69597.

Attached is a very simple script that uses dttxml to get the transfer function data from an xml file, getting the IN2/exc/IN1/exc unbiased transfer function.  I also plotted uncertainties based on 10506, calculating an uncertainty for magnitude and phase from in1/exc and in2/exc separately and adding them in quadrature (this is not the correct way to add these uncertainties).

It seems like we have room to add a boost to this loop.