Sat Aug 12 10:16:34 2023 INFO: Fill completed in 16min 29secs

TITLE: 08/12 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Austin
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 2mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY: H1 has been locked for over 7 hours. Looks like we dropped observing for 3 seconds at 14:00:37 for two SDF diffs on syscssqz, but observing was resumed automatically (tagging SQZ).

• CDS, SEI, SUS, dust all okay

TITLE: 08/12 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Austin
SHIFT SUMMARY:

Lost lock 30 minutes ago(72168) and currently locking back up. ALSY was having trouble holding a lock but I was able to help it along.

23:00UTC Observing and Locked for 3hrs

23:41:09 Taken out of Observing due to SDF Diffs in syscssqz. I used this as a chance to reload the H1LSC model to load in the changed Elenna had made (72163)
23:42:34 I put us back into Observing

LOG:                                                                                                                                                                                                                                                                                                                                                                                                                                                                 

Lockloss at 6:28UTC

Closes FAMIS #25594, last checked in 71978

Corner Station Fans (Attachment1)
Corner station fans all well within range. The line ~2.5 days ago was due to the corner station fans shutting off from the Fire Alarm(72097).

Outbuilding Fans (Attachment2)
All outbuilding fans well within range.

Other observations
-On August 5th at 18:07UTC, something happened to MY_FAN1_270_1/2 that caused MY_FAN1_270_1 to go from ~0.7 to ~0.3.

During Tuesday maintance this week, we moved the upper (inner) beam of the Xend Pcal system down from it's nominal location by 2.5 mm on the surface of the ETM (see aLog entry 72063).

The observed change in the Pcal X/Y comparison should give a measurement of the vertical component of the displacement of the interferometer beam from the center of the ETM.  This displacement, denoted by the b_y, is given by

Delta_XY =  c/2 * b_y * M / I

where Delta_XY is the observed change in the Pcal X/Y comparison (after minus before), c is the change in the vertical position of upper Pcal beam, the factor of 1/2 results from only moving one of the two Pcal beams,  b_y is the vertical component of the displacement of the interferometer beam from the center of the optic, M is the mass of the optic, and I is the moment of intertia of the ETM for rotation about an axis parallel to the face of the optic and and through the center of the face of the optic.

Thus the interferometer beam displacement can be estimated by b_y  = 2* Delta_XY / (c * M / I).

For the Xend ETM, M / I = 0.94e-4 / mm^2 and c = - 2.5 mm.  Thus b_y = -0.85e4 * Delta_XY mm

Using DTT to analyze data (1024 sec FFTs, 50% overlap, 10 avgs) during a lock stretch the day before we moved the beam, 08/07 from about 08:00 to 23:00 UTC, and after the move on 08/09 between 00:30 and 06:30 and between 11:30 and 15:30.  We observe a change in the X/Y comparison of about - 24e-4 (see attached plot).  This would indicate an interferoemter beam offset of about 20.7 mm in the positive y direction, ABOVE the center of the optic.

Info provided by JenneB (seel below) indicated that the pitch measurements using the electrostatic acutators indicate that the interferometer beam is offset by about 14.3 mm BELOW the center of the ETM.

We will look at more data from before and after the beam position move and double-check our calcuation to make sure we aren't missing a minus sign somewhere.

Next Tuesday, we plan to move the beam back to it's nominal vertical potition and offset it to the left (when viewing the fact of the optic from the BS side) by 2.5 mm to assess the horizontal component of the interferometer beam offset from center.

TITLE: 08/11 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 12mph Gusts, 10mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY:

Taking over for Ryan S. Observing and Locked for 3 hours.

TITLE: 08/11 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Shift started troubleshooting locking issues eventually tracked down to recently modified SR2/3 damping gains (see alog 72152). Two short lock stretches in the morning to do some PEM injections while L1 was down. Back to observing by early afternoon, now locked for almost 3 hours.

• 1455 Holding in DRMI_LOCKED_PREP_ASC to fix SR2/3 damping gains
• 1600 NLN; automatic acquisition after DRMI
  • Robert starting injections @ EY
• 1641 Lockloss, seemed fast, cause unknown
• 1740 Back to NLN, automatic acquisition
  • Continuing EY injections
• 1900 Lockloss, seemed fast, cause unknown
• 1924 While relocking, locklosses at CHECK_AS_SHUTTERS and FIND_IR
• 2009 NLN, automatic acquisition
• 2028 Observing

LOG:

Finished a walk through of the wind fences today. Both fences looked fine, no damage. Attached photo is of the EX fence. No pics of the EY fence, still waiting on my replacement phone, but there's nothing to show.

FAMIS 25491

Laser Status:
    NPRO output power is 1.83W (nominal ~2W)
    AMP1 output power is 67.19W (nominal ~70W)
    AMP2 output power is 134.8W (nominal 135-140W)
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN

PMC:
    It has been locked 5 days, 3 hr 15 minutes
    Reflected power = 17.33W
    Transmitted power = 108.6W
    PowerSum = 125.9W

FSS:
    It has been locked for 0 days 1 hr and 45 min
    TPD[V] = 0.9241V

ISS:
    The diffracted power is around 2.1%
    Last saturation event was 0 days 1 hours and 45 minutes ago

Possible Issues: None

Fri Aug 11 10:17:15 2023 INFO: Fill completed in 17min 10secs

Gerardo confirmed a good fill curbside.

After the locking struggles this morning (alogs 72145 and 72149), Gabriele suggested reverting the SR2 and SR3 damping gains back to a higher value.  RyanS did that by hand, and the IFO got all the way to NLN the next lock with no further assistance (I believe). 

While the IFO was relocking, I added a few lines to the end of LOWNOISE_ASC to set the SR2 and SR3 damping gains to their lower values from alog 72130.

TJ and RyanS are working right now on a way to ensure that we have the higher gain values for lock acquisition and initial alignment, but also the lower gains accepted in the Observe.snap file (as of early this morning, the safe.snap and observe.snap files are still linked).

TITLE: 08/11 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Austin
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 4mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY: H1 lost lock at 11:55 UTC and has been struggling to relock since; appears to be the same issue encountered by Ryan C. and Austin last night (alogs 72145 and 72149). Starting with troubleshooting now.

• CDS, SEI, SUS, dust all okay, wind is low

Follow up on previous tests (72106)

First I injected noise on SR2_M1_DAMP_P and SR2_M1_DAMP_L to measure the transfer function to SRCL. The result shows that the shape is different and the ratio is not constant in frequency. Therefore we probably can't cancel the coupling of SR2_DAMP_P to SRCL by rebalancing the driving matrix. Although I haven't thought carefully if there is some loop correction I need to do for those transfer functions. I measured and plotted the DAMP_*_OUT to SRCL_OUT. transfer functions. It might still be worth trying to change the P driving matrix while monitoring a P line to minimize the coupling to SRCL.

Then I reduced the damping gains for SR2 and SR3 even further. We are now running with SR2_M1_DAMP_*_GAIN = -0.1 (was -0.5 for all but P that was -0.2 since I reduced it yesterday). Also SR3_M1_DAMP_*_GAIN = -0.2 (was -1). This has improved a lot the SRCL motion and also improved DARM RMS. It looks like it also improved the range.

Tony has accepted this new configuration in SDF.

Detailed log below for future reference.

Time with SR2 P gain at -0.2 (but before that too)
from    PDT: 2023-08-10 08:52:40.466492 PDT
        UTC: 2023-08-10 15:52:40.466492 UTC
        GPS: 1375717978.466492
to      PDT: 2023-08-10 09:00:06.986101 PDT
        UTC: 2023-08-10 16:00:06.986101 UTC
        GPS: 1375718424.986101

H1:SUS-SR2_M1_DAMP_P_EXC  butter("BandPass",4,1,10) ampl 2
from    PDT: 2023-08-10 09:07:18.701326 PDT
        UTC: 2023-08-10 16:07:18.701326 UTC
        GPS: 1375718856.701326
to      PDT: 2023-08-10 09:10:48.310499 PDT
        UTC: 2023-08-10 16:10:48.310499 UTC
        GPS: 1375719066.310499

H1:SUS-SR2_M1_DAMP_L_EXC  butter("BandPass",4,1,10) ampl 0.2
from    PDT: 2023-08-10 09:13:48.039178 PDT
        UTC: 2023-08-10 16:13:48.039178 UTC
        GPS: 1375719246.039178
to      PDT: 2023-08-10 09:17:08.657970 PDT
        UTC: 2023-08-10 16:17:08.657970 UTC
        GPS: 1375719446.657970

All SR2 damping at -0.2, all SR3 damping at -0.5
start   PDT: 2023-08-10 09:31:47.701973 PDT
        UTC: 2023-08-10 16:31:47.701973 UTC
        GPS: 1375720325.701973
to      PDT: 2023-08-10 09:37:34.801318 PDT
        UTC: 2023-08-10 16:37:34.801318 UTC
        GPS: 1375720672.801318

All SR2 damping at -0.2, all SR3 damping at -0.2
start   PDT: 2023-08-10 09:38:42.830657 PDT
        UTC: 2023-08-10 16:38:42.830657 UTC
        GPS: 1375720740.830657
to      PDT: 2023-08-10 09:43:58.578103 PDT
        UTC: 2023-08-10 16:43:58.578103 UTC
        GPS: 1375721056.578103

All SR2 damping at -0.1, all SR3 damping at -0.2
start   PDT: 2023-08-10 09:45:38.009515 PDT
        UTC: 2023-08-10 16:45:38.009515 UTC
        GPS: 1375721156.009515

Benoit, Ansel, Derek

Benoit noticed that for recent locks, the 102.13 Hz calibration line is much louder than typical for the first few hours of the lock. An example of this behavior is shown in the attached spectrogram of H1 strain data on August 5 - this is the first day this behavior appeared. Ansel noted that this feature includes a comb-like structure around the line that is only present in the H1:GDS-CALIB_STRAIN_NOLINES channel and not H1:GDS-CALIB_STRAIN (see spectra for CALIB_STRAIN and CALIB_STRAIN_NOLINES on Aug 5). This issue also visible in the PCAL trends for the 102.13 Hz line. 

We are not sure if the excess noise near 102.13 Hz is from the calibration line itself or another noise source that is near the line. However, the behavior has been present for every lock since 12:30 UTC on August 5 2023. 

At 13:00 UTC this morning, H1 had relocked automatically all the way to NOMINAL_LOW_NOISE and the only thing preventing the observation intent bit to be set to OBSERVE was for the ADS to converge in order to switch over to the camera servos. Even though this is expected behavior, IFO_NOTIFY sent an alert to me as the operator because H1 had been in NLN for 3 minutes and the intent bit had not been flipped. After 13 minutes of waiting in NLN for the camera servos to turn on, the intent bit was set to OBSERVE automatically without any intervention.

Since we've seen ADS take up to 15 minutes to converge while in NLN before we can go to observing, I've increased IFO_NOTIFY's nln_not_obs timer from 3 minutes to 15 to avoid unnecessary notifications while ADS is converging as expected.

[Keita, Nutsinee, Sheila, Jenne]

We went in to HAM6 today, and believe that we have finished all ISC/SQZ related tasks, and are ready to begin closeout procedures tomorrow.  (Betsy, who has the final say, will write an alog or talk to the relevant folks for the actual final start of closeout.)

After Richard opened the PSL shutter and Ed locked the IMC, we pretty easily were able to get beam onto AS_C.  To check our alignment, Sheila aligned the Michelson, then made sure we were still centered on AS_C.  Since we don't have arms, we just assumed that the input beam is pretty close to its usual, and only adjusted ITMs and BS for MICH.  Around this time, Keita noticed that there was a bit of a 'tail' on the beam as seen on an IR card.  Sheila walked SR2 and SR3 until the tail was gone, but we were still centered on AS_C.  After this we aligned SRY (restored SRM, misaligned ITMX) to get good fringes, so that we could trust the SRM position for squeezer-related work.  We also took the IMC offline (which misaligns MC2) to remove the main IFO beam, injected the SQZ beam, ran the squeezer's ASC loops, and noted that the ZM1 actuators were very close to the edge of their ranges (as Sheila made a quick note about in alog 52405).  We deferred action on this until after the main IFO path checks were complete.

Once we were happy with all of our alignments we brought the main IFO beam back and Nutsinee took photos of the beam in several different places, including the septum window, the position on OM1, the position relative to the fast shutter's wire, the position on OM2, the position going into and returning from the OMC shroud, and some photos to ensure that we don't see any obvious scattered light at the shroud apertures. 

Having completed this, and deciding that it was still quite early in the day, we began work on relieving the ZM1 actuator.  Sheila noted that the pico that is on/near the OFI is closer in Gouy phase to ZM2 than ZM1, so would not be a satisfactory way of relieving ZM1.  Sheila and Keita went in and adjusted the last steering mirror on the VOPO platform that sends the beam to ZM1 about 1/4 of a turn in yaw, clockwise if you are standing at the endcap. After I damped the VOPO we re-ran the squeezer alignment loops, and found that instead of having outputs of nearly 29k the ZM1 outputs were at most about 7k.  Excellent!  We note that the ZM2 outputs are around 22k, but this is the same that they were during O3a, it hasn't drifted, and if we need to we can relieve ZM2 using the pico, so we are leaving things as-is.

With these 2 sets of checks and work, I believe that we are done with ISC/SQZ work in HAM6.  Nutsinee will comment with her photos.