After chatting with Sushant at LLO, I followed his advice to add a bit of weight to the minimization metric at 60 Hz, and was able to get cleaning parameters that do a pretty good job of subtracting jitter and laser frequency noise, but don't inject noise at the 60 Hz line.  The jitter subtraction is a little less good than alog 72276, but it's important to not inject noise with the cleaning, so this is a good balance. I similarly retrained the laser noise, and with both of them on (while other commissioning work was ongoing), I see good subtraction and no noise injection at 60 Hz.  This is shown in the first attachment.

After having collected a bit of time with the jitter and laser noise subtracted, I retrained the LSC modulated cleaning.  Unfortunately, when trying it in the online system (I don't have the offline mimic of this working yet), it needs a similar mysterious minus sign much like the jitter subtraction needed until I recompiled the code last week.  I'm starting to suspect that the LSC NonSENS c-code also needs to be regenerated and recompiled, and hopefully that will solve my minus sign issue.  Anyhow, when the LSC noise estimate has that minus sign in place, it gives a reasonable amount of subtraction, as shown in the second attachment.

The third attachment shows the improvement (when blue is above pink/orange) in range from the cleaning.  Around 19-20 hours on that plot I'm just subtracting jitter and laser noise.  Around 21 hours I add in LSC subtraction, and we get back to ~150 Mpc.  So, likely our LSC FF is becoming mistuned, and we'd benefit from either retuning the LSC FF or finally implementing the NonSENS subtraction. 

The cleaning review committee meets tomorrow.  All of this is turned off when the IFO is in Observing until given approval by the review committee.

While some calibration work was ongoing, I turned off the HAM1 -> CHARD feedforward, so that Elenna / Gabriele can potentially retrain the filters to make further improvements now that Jim has installed new HAM1 seismic feedforward filters (alog 72393).

The switch H1:HPI-HAM1_TTL4C_FF_OUTSW was off from 23 Aug 2023 22:03:47 UTC to 22:55:20 UTC. 

TITLE: 08/23 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc

INCOMING OPERATOR: Corey
SHIFT SUMMARY: Optics lab and PSL anteroom dust alarms have been off and on today just as yesterday.

Lock#1:

Lockloss at 15:33UTC

Lock#2:

No flashes on DRMI or PRMI, tried check mich, no luck, went into IA. I had to help out Yarm during green arms (ENABLE_WFS state on Yarm) by tapping pitch a microradian.

NLN at 17:20UTC with no interventions, in Observing at 17:35UTC.

Out of Observing at 19:08 for planned commissioning work. I brought us to NLN_CAL_MEAS to take a calibration measurement at 21:33UTC

Back into Observing at 22:55UTC

LOG:                                                                                                                                                                                                  

I reduced the amplitude of the 17.1 Hz PCALY calibration line. This is a continuation of LHO:71945.



Channel                                                             Old Gain            New Gain            Reduction Factor
=================                                     =========        ===========        ===========
H1:CAL-PCALY_PCALOSC1_OSC_SINGAIN          250                   115                              2.17


The changes have been saved to observe and safe snap files in the SDF system.

Naoki, Vicky

Today we tested higher generated SQZ level and FC detuning, summary screenshot here. We turned up non-linear gain from NLG 11 to 17, so gen sqz level from 14.7dB to 17dB, and very barely got more sqz (< 0.2dB?). We set it back to the "normal" 80uW operating point, leaving the injected sqz level unchanged. We ended up changing FC detuning from -25 Hz to -28 Hz. Notes:

• no sqz 1376852952 - 1376853678.  (OPO taken down at 1376853301)
• Re-injected FDS with OPO_TRANS = 95uW (NLG=17, Gen Sqz = 16.95 dB). Adjusted OPO temp to maximize CLF_RF6_ABS and watching SQZ level in DARM.
• 19:37 - 19:41 High NLG at 95uW, fc detuning -28
  • Barely more sqz, probably not more than 0.2 dB sqz at high freq (including trying different angles, after adjusting OPO temp). I was a little surprised, I thought we would have seen more squeezing with the NLG increase..
• At FC detuning = -28 Hz (was -25 Hz), set OPO TRANS back to 80 uW.
• Ran a slow-ish sqz angle sweep from about 1376855983-1376856425. Will try using this slower sweep to improve calibration fits of the clf_demod_phase to the true sqz angle.
  • Reminder: clf_demod_phase is what we use to change the sqz angle (e.g. 71902), but they are not the same thing. See 49026 for equation relating sqz angle and clf demod phase.
• Leaving FC detuning at -28 Hz (was -25 Hz). Naoki accepted this in SDF. Not sure if this is really better, but it's possible, so we will try this for now.
   
• Briefly tried to see whether there is excess noise with the beam diverter open, opo unlocked, and pump flipper blocked (clf shutter open). In principle, if there's scatter from the squeezer that's above DARM, maybe we would see it in this configuration? From the blue trace in this screenshot of no-sqz traces, I don't see a noticeable amount of excess noise when comparing this state with the regular "no squeezing" reference taken ~1 hour ago, but I didn't take a back-to-back proper no-sqz reference, so the traces are not as comparable as I'd like.

I stole the filter that Huyen used for her HAM1 feedforward test, and tried it on the LHO HAM1, with a gain tweak of 17% (ie I multiplied by a gain of 1.17 vs LLO ) to match my measurements and it seems to work well. I was having difficulty with my hand fits with excess low frequency noise or gain peaking where I tried to roll my filters off.  First plot shows the on/ off asds for the HAM2 sts and the HAM1 Z HEPI l4cs. I don't know if I quite believe the improvement below 1 hz is due to the feedforward, but Huyen said she got improvement kind of 1-70hz and that seems to be the case here as well. I'm leaving this filter on overnight, to get good low frequency data.

Second image compares one of my filters(red) with the (green) LLO filter. One thing I still don't understand is that my filters have often caused broad low frequency noise, but the LLO filter doesn't seem to. We don't currently have a noise model for HEPI that allows modeling the ff performance, that would help a lot.

I ran a calibration measurement at the behest of Louis this afternoon, starting with the broadband:

/ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20230823T213349Z.xml

Then the simulines:

GPS start: 1376862014.581911

GPS end: 1376863342.763444

2023-08-23 22:02:04,350 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20230823T213958Z.hdf5
2023-08-23 22:02:04,374 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20230823T213958Z.hdf5
2023-08-23 22:02:04,387 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20230823T213958Z.hdf5
2023-08-23 22:02:04,402 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20230823T213958Z.hdf5
2023-08-23 22:02:04,417 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20230823T213958Z.hdf5

Wed Aug 23 10:11:14 2023 INFO: Fill completed in 11min 10secs

DCPD saturation then lockloss

TITLE: 08/23 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: SEISMON_ALERT
    Wind: 3mph Gusts, 2mph 5min avg
    Primary useism: 0.07 μm/s
    Secondary useism: 0.18 μm/s
QUICK SUMMARY:

• We've been locked for 17:35, In observing since 08:43, we dropped out for a minute at 08:42 from the previous segment starting at 21:45UTC on the 22nd
• CDS/Dust/SEI/SUS/VAC looks good
• We're riding through a 6.2 EQ from Argentina

TITLE: 08/23 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: Uneventful and quiet night. Detector in Observing and Locked for 9hrs 40mins. Dust is finally settling down in the PSL, and our range is creeping back up as compared to the start of my shift.

23:00UTC Start of shift - detector in Observing and Locked for 1.5 hours

23:03 Superevent S230822bm

LOG:

Previously done in 72264

Closes FAMIS#25080

No In-Lock SUS Charge measurements were made this morning due to the SUS_CHARGE Guardian having been in the DOWN state since last Tuesday 8/15 15:29UTC. TJ had fixed up some errors in the SUS_CHARGE code (72219) and had placed it in DOWN for Tuesday Maintainance but had forgotten it there.

At 3:56UTC I put the Guardian back into the correct WAITING state by selecting INJECTIONS_COMPLETE, as done in 71067.

We are still in Observing and have been Locked for 5hrs 40mins now.

All the dust monitors that have had high dust counts from Tuesday Maintainance are going down, with the exception of both the >300um and >500um counts in the PSL Laser Room, of which the >300um counts is at the second highest it's been in 7ish years (highest it's been in the last ~7 years was two weeks ago). This rise in dust looks like it could be related to the wind at the corner station, so I'll keep an eye on it and hopefully it'll come down as the wind dies down.

TITLE: 08/22 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 141Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

• We tried to hold the lock through some of the maintenance activities but we had to unlock at 15:46 in order for the PCAL team to get a good measurement.
• EX VAC pressure red alarm at 16:55UTC, H0:VAC-EX_X2_PT524B_PRESS_TORR
• PSL anteroom dust counts have remained high, EX and Optics lab dust alarms off and on throughout the afternoon.

Lock#1:

Yarm locked at a low power (~75%, lower power than XARm) and oscillating, no flashes at DRMI or PRMI, CHECK_MICH lockloss. There was a few more LL at FIND_IR and LOCKING ALS so I did an Initial Alignment, which went well untill we got to SRC where it tried for a while then eventually gave me a message "find by hand" where I tapped on SRM in Pitch maybe 10 microradians to maximize the signal and it was enough to push it onwords and finish IA.

Yarm looked better after the IA but was still oscillating, during these troubles the Norco liquid nitrogen truck was filling CP1 but we weren't seeing any extra motion on the CS accelerometers that we looked at.

Reached NLN at 21:25UTC, I had some sus SDF diffs pop up, they were all TRAMPs so I accepted them on SUSTMSX & SUSETMX. The 102Hz peak was noticable at the start of the lock.

In Observing at 21:45UTC, our range is lower now this lock

LOG:                                                                            

TITLE: 08/22 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 139Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 23mph Gusts, 19mph 5min avg
    Primary useism: 0.09 μm/s
    Secondary useism: 0.11 μm/s
QUICK SUMMARY:

Detector is in Observing and has been Locked for an hour and a half. Decently windy outside.

WP11361 TW1 raw minute trend file offload

Jonathan, Dave:

Last week the files were copied from the almost full SSD on h1daqtw1 to archive spinning media on h1ldasgw1. This morning I completed the transfer by reconfiguring nds1 to use the archive location, and then deleted the files from h1daqtw1's SSD RAID, reducing its usage from 97% to 4%. Jonathan made the nds1 configuration change permanent in puppet.

cdslogin reboot

Jonathan, Dave:

Jonathan rebooted cdslogin at 13:48. The CDS alarm and alert systems came back online with no problems.

WP 11383
alog 66730

Cable clean-up of the VMON channels for monitoring the ESD 18V and 48V power lines. Signals tied to the power lines through BNC bulkheads on the junction box (top of rack). Voltage divider boxes are installed in series. Signal routed through PEM test panel to AA chassis. See attached pictures. Will work with PEM group to see how we want to isolate the divider boxes and route cables.

Maintenance activities have finished and we are going to start relocking and do a quick ALS automation code test while relocking green arms.