TITLE: 09/01 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 116Mpc
INCOMING OPERATOR: Jeff
SHIFT SUMMARY: locked all shift, 3 EQS, one was a 5.5 in Canada, and lock held
LOG: power cycled Video4, top monitor didn't power up, handing off to JeffB
The good news is that the PSL temperature is coming down.
Hugh and JeffB's alog that suggests a connection between PSL temperature and Tidal extremes, alog 51648, third plot.
The first plot shows that the Table North is sitll about 0.5F above the temperature before Thursday's work.
The second plot is from May, where the PSL AC was strategiacally turned off to put the temperature back as close as possible to the temperature before entreing into the enclosure, which was successful.
H1 in Observe, 3 EQS, and Tidal plots attached, Tidal is below 200000.
TITLE: 08/31 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 116Mpc
OUTGOING OPERATOR: Niko
CURRENT ENVIRONMENT:
SEI_CONF state: WINDY
Wind: 14mph Gusts, 12mph 5min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.07 μm/s
QUICK SUMMARY: H1 in Observe, wind spike to almost 30mph right around shift change, and wind signature has increased on the 0.03-0.1Hz seismometor at EY
TIDAL UPDATE: plot attached is of 3 days, and there's a hint that tidal is climbing again, though the climb has a hint of being at a slower rate than the previous lock.
Tidal effects might be accentuated by the supermoon that peaked yesterday. One would expect this behaviour to dissappear over the next day or so.
TITLE: 08/31 Day Shift 15:00 – 23:00 (08:00-16:00), all times posted in UTC
STATE of H1: Observing
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY: Quiet shift, SQZ had some issues in the last hour but it seems fine now. Locked and Observing for 12.5 hours.
LOG:
15:00 (08:00) Start of shift
16:39 (09:39) GRB E348796 -- standing down for 15 minutes
22:06 (15:06) Out of observing, SQZ lost lock. Re-locking now
22:07 (15:07) SQZ locked, back to Observing
22:08 (15:08) SQZ dropped out again
22:10 (15:10) SQZ locked, back to Observing
21:10 (15:10) Dropped again. Waiting this time.
22:18 (15:18) SQZ not unlocking, back to Observing
23:00 (16:00) End of shift
[J. Betzwieser, T. Mistry, M. Wade, A. Viets]
Timesh and Joe recently found evidence that the imaginary parts of the actuation kappas are inconsistent with measurements from calibration sweeps: LLO aLOG 48183. I made some broadband injection plots for L1 to help us decide whether we should be applying corrections for these (See LLO aLOG 48245). At H1, the GDS calibration pipeline has been applying corrections for the imaginary parts of the kappas since May 21. This was seen to improve calibration accuracy at H1 near the end of O2 (see P1800313, especially plots on pages 6 and 7). However, systematic errors in the estimates of the actuation kappas can also cause the imaginary parts to drift from zero, especially when other TDCFs drift substantially from their nominal values. This has raised suspicion that correcting for the "complex kappas" is making systematic errors worse rather than better. To test this, I've used 4 broadband injections from the Y-end Pcal to make comparisons. In short, the results show that for now, we should correct for only the real parts (or magnitudes) of the actuation kappas. The imaginary parts are probably dominated by systematic errors based on these results. Since our sensing function model at low frequencies is under question as well, I also included comparisons of accuracy between h(t) that is corrected for time dependence in SRC detuning and h(t) that is not. In total 4 versions of calibration are plotted in the attached figures:
To my eye, the four plots below seem to indicate that 1 is the most accurate calibration. Each of the below plots used 180 seconds of data, and the start times are given below, in the same order as the attachments:
For now, the obvious solution is to turn off application of the imaginary parts of the kappas. In the long run, it may be beneficial to use a solution for the TDCFs that is not subject to this systematic error. Such a solution is in the works, but is not yet ready to be deployed.
These plots, as well as text files with the data, are available in the calibration SVN here:
aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOSensingTFs/DCS_BB_plots
Quiet shift so far, one GRB and a medium EQ. Wind is up a bit, locked and Observing for 9 hours.
Neither trend has strayed into the red line warning regions.
Added plot of current tidal.
Ops Shift Transition: 08/31/2019, Day Shift 15:00 – 23:00 (08:00-16:00) - UTC (PT)
State of H1: Locked
Intent Bit: Observing
Weather: 0-5 mph wind
Primary 0.03 – 0.1Hz: 0.01 um/s
Secondary 0.1 – 0.3Hz: 0.1 um/s
Outgoing Operator: Jeff
Quick Summary: Locked at 119.5 Mpc, Observing for 4.5 hours
At the start of the shift the X & Y Tidal were close to the upper limits, (70,000). Tidal started climbing on 08/30/19 at ~01:58 (08:58) and has been on a sharp uptrend since. Called Hugh, to see what could be done before the inevitable lock loss. Hugh came in and we started looking more in depth for the cause.
While Hugh was looking around, I called Peter K. to see if there were issues with the Ref Cav length may have changed. The REF_CAV temperature changed by 0.01K. Could not see anything obviously wrong. (See Plot-1).
Plot-2 shows the 5 day trend for the X & Y Tidal signals. There is a marked turn upward at 08/30/19 at 01:59 (08:59), which continues until the upper of 70,000 is reached. One can also still see the tidal sine waveform is clear in the climbing tidal signal.
As I was relocking, Hugh continued to look around and found an interesting comparison of the tidal signal and the PSL laser room temperature. Plot-3 is a 30 day trend of the laser room temp and the tidal signal. There is a rise in the tidal associated with three entries into the PSL. Not a smoking gun, but perhaps a clue.
Time line:
IFO broke lock at 08:44 (01:44). Both the Y and X tidal signals had railed at 70,000.
Started relocking - At Hugh's suggestion I unlocked ALS-X and ALS-Y to give the tidal a chance to bleed off to zero.
09:03 (02:03) Started relocking. Had to tweak ALS-Y a couple of kicks in Yaw to get it to lock.
09:05 (02:05) Start DRMI_1F
09:16 (02:16) Drop to ACQUIRE_PRMI - Was not locking so I dressed up PRM Yaw.
09:23 (02:23) Back to DRMI_1F
09:27 (02:27) DRMI_1F locked and continued up the locking trail
Stopped at CHECK_AS_SHUTTERS to dress up RF_18 and RF_90 power
Made small changes to PRM Pitch and Yaw, No changes to SRM
09:38 (02:38) Lockloss at ENGAGE_ASC_FOR_FULL_IFO
09:40 (02:40) Started second relocking
10:25 (03:25) Relocked at NLN
10:25 (03:25) No SDF Diffs - Bck to Observing
10:29 (03:29) Tidal Y = 20885, Tidal X = -445 I will monitor the tidal signals throughout the shift to see if they are climbing again.
TITLE: 08/31 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 118Mpc
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY: locked all shift, but tidal didn't turn around, and is close to railing at 700000 on both arms, plot attached
LOG:
Plot of recent changes to Tidal, about 3 days, and a 10 day plot showing longer term trends. NPRO temp has changed, and PMC (though not more than usual), and FSS on a very small scale (~0.01 deg/counts/C?).
Power spectra and coherance plots attached, one from 04:04UTC, and the other 04:40UTC, both from today. ETMX has peak at 9.8Hz, but also a second peak at ~9.94Hz, in the power spectra, and in the coherance with Cal Delta, there's a lot going on between 9Hz and 11Hz, with what apears to be 4 major peaks, all with coherance of 0.7+. In contrast, all other quad optics have one coherance peak around 9.8Hz, and no others that are above 0.1 in coherance between 9Hz and 11Hz.
H1 locked for 26 hours, in Observe for almost 6 hours, the break in Observe was TCSY laser losing lock, it relocked on it's own, about 3 minutes out of Observe.
TITLE: 08/30 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 119Mpc
OUTGOING OPERATOR: Patrick
CURRENT ENVIRONMENT:
SEI_CONF state: WINDY
Wind: 16mph Gusts, 12mph 5min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.07 μm/s
QUICK SUMMARY: locked for 18 hours, tidal seems to have changed behavior in the last 2 days, Hugh mentioned maybe a change on REF Cav, plots attached
EX tidal has just railed at 700000.