edmond.merilh@LIGO.ORG - posted 05:00, Saturday 01 February 2020 - last comment - 05:58, Saturday 01 February 2020(54843)
H1 back to Observing 12:59UTC
11:28 Lockloss
TITLE: 02/01 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 103Mpc
OUTGOING OPERATOR: Patrick
CURRENT ENVIRONMENT:
SEI_CONF state: WINDY
Wind: 27mph Gusts, 24mph 5min avg
Primary useism: 0.06 μm/s
Secondary useism: 0.36 μm/s
QUICK SUMMARY:
H1 locked 10hrs 13 min and Observing from the last squeezer re-lock.
A trend of the range for the last 8 hours shows the dwindling range. It was much higher when the wind was 40+ and gusting to 50mph 7 hours ago. Currently the winds are gusting to ~26. The degrading range seems to have been trending downward since the back to back squeezer incidents. (110.130Mpc at time of this post.)
TITLE: 01/31 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC STATE of H1: Observing at 107Mpc INCOMING OPERATOR: Ed SHIFT SUMMARY: Have remained locked the entire shift, despite high winds. Taken out of observing twice by the squeezer. The first time oddly resulted in an SDF difference. The range has been declining quite significantly over the last couple of hours, despite the fact that the wind has been decreasing. LOG: 00:58 UTC GRB-Long E361872 Set INJ_TRANS to INJECT_KILL Fermi Trigger ID 602211445 TRIGGER_DUR: 2.048 [sec] Ignore 05:00 UTC Squeezer takes us out of observing. The SQZ_MANAGER node seems to say it is stalled. I hit INIT on the SQZ_MANAGER node. The SQZ_MANAGER guardian state makes it back to SQUEEZING. There is an SDF difference. I accepted it. 05:04 UTC Back to observing. 05:50 UTC Squeezer takes us out of observing. The SQZ_MANAGER node seems to say it is stalled. I hit INIT twice. 06:00 UTC Back to observing. No SDF differences this time. 07:48 UTC Set INJ_TRANS back to INJECT_SUCCESS
05:00 UTC Squeezer takes us out of observing. The SQZ_MANAGER node seems to say it is stalled. I hit INIT on the SQZ_MANAGER node. The SQZ_MANAGER guardian state makes it back to SQUEEZING. There is an SDF difference (attached). I accepted it. 05:04 UTC Back to observing.
Happened again, but no SDF difference this time. See attached screenshot.
Keita, Sheila
The reason the SQZ_MANAGER was stalled, and didn't relock the squeezer, is left over from a mistake I made on Thursday.
I commented out the line @unstall_nodes decorator in ISC_LOCK Nominal_low_noise, which is a work around for a problem with the new lose management. If I don't comment out this line, even while the SQZ_MANAGER is in auto mode, ISC_LOCK will take control of it and re-inject squeezing into the IFO, messing up whatever measurements are going on. Part of this that I don't understand is that it takes several minutes for this to happen. I usually take this linke out and put it back into the guardian when I'm done with the test, but forgot this time. We've talked about the problem with Jamie, he says that there is some kind of solution coming, perhaps making the loose management optional so that we can turn it off.
The SDF diff that Patrick accepted here is that the CLF ISS is on, which it should always be. It has been off since the observing stretch which we had without squeezing on Thursday. This is also my mistake, we accepted many SDFs to go to observing without squeezing on Thursday, and this one I didn't undo correctly.
Have remained locked and in observing through high winds. There have been a couple of DIAG_MAIN alerts: "BRS_CHECK: BRSY is noisy".
Yasmeen Asali, Zsuzsa Marka This work was performed during Detchar noise sprint at LLO, January 29-31, 2020. The main focus was LLO scattering_light glitches, however we repeated some of the studies for LHO as well and thus report them here. Studied and compared the distribution of scattered_light glitches found by GravitySpy (confidence>=0.9) for all of O3a versus O3b (till January 17th). See distributions attached. Observations: 1. Rate - ~ten-fold increase of scattered_light glitches found by GravitySpy. All Scattered Light in O3A: 0.00056 (2.016 /hour) vs. All Scattered Light in O3B: 0.00563 (20.268 /hour) 2. We also looked into September and November (any seasonal effects?) to see how distributions compared to the rest of O3A and O3B, and found them to be very similar to the full runs. 3. We looked at how the number of scattered_light glitches evolved over time and found that scattered_light glitches occur in clusters, and the frequency and size of these clusters has drastically increased between O3A and O3B, see attached plot. For further information see full report at detchar f2f noise sprint wiki: https://docs.google.com/document/d/1YH2ffuDKNC9BeLbluroB_d2TkkdaQi6k6gF2IUirn4g
TITLE: 01/31 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 114Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
SEI_CONF state: WINDY
Wind: 34mph Gusts, 30mph 5min avg
Primary useism: 0.07 μm/s
Secondary useism: 0.33 μm/s
QUICK SUMMARY: Range seems to be falling, possibly in conjunction with rising winds.
Trending the CLF REFL PD and IR PDs, we can deduce the CLF transmission through the OPO. The OPO IR PD is installed after a 50:50 beampsplitter, so it should see half the power of the squeezer path, when the beam diverter is closed.
| CLF REFL (µW) | IR PD (µW) | sqz path (µW) | Throughput (%) | |
|---|---|---|---|---|
| High power | 120 | 2.75 | 5.5 | 4.6 |
| Medium power | 54 | 1.25 | 2.5 | 4.6 |
Our best LO sensing noise was measured with the 120µW CLF at 1.0×10–6 rad/√Hz, with a CLF sensing noise at 3.7×10–6 rad/√Hz.
TITLE: 01/31 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 117Mpc
INCOMING OPERATOR: Patrick
SHIFT SUMMARY: Bad winds midshit
LOG:
19:46 lockloss from 60 mph gust, winds kept us down for the next hour, but I didn't have to touch anything to come back up after winds calmed down
21:53 Back to observing
Lost lock maybe 20 minutes ago, we are having 60 mph winds right now, so I don't think we'll be coming back any time soon.
TITLE: 01/31 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 121Mpc
INCOMING OPERATOR: Jim
SHIFT SUMMARY:
LOG:
H1 locked for 8hr 35 min and Observing at 120.5 Mpc
03;33 Switched SEI_CONF to EQ pursuant to Verbal Alarm of incoming 5.1 earthquake from Kodiak Alaska.
TITLE: 01/31 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 118Mpc
OUTGOING OPERATOR: Camilla
CURRENT ENVIRONMENT:
SEI_CONF state: WINDY
Wind: 8mph Gusts, 6mph 5min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.38 μm/s
QUICK SUMMARY:
TITLE: 01/31 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 119Mpc
INCOMING OPERATOR: Ed
SHIFT SUMMARY: Locked 4h30
LOG:
Re: increase flashes. Yeah something similar to that is the plan, but I need time to test which hopefully means this coming Tuesday.
SDF DIFFS were noted and accepted (see images below)
13:57 H1 seems to have adjusted back to more nominal range ~118 Mpc