Displaying reports 49181-49200 of 83228.Go to page Start 2456 2457 2458 2459 2460 2461 2462 2463 2464 End
Reports until 08:12, Thursday 23 March 2017
H1 General
jim.warner@LIGO.ORG - posted 08:12, Thursday 23 March 2017 (35034)
Shift Summary

TITLE: 03/23 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 0Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY:  Rough shift, RF45 was bad, alignment looks bad now.
LOG:
RF45 was terrible all night. Richard came in this morning and replaced the chassis (~14:00 UTC), but I couldn't get DRMI after the swap. I started IA at about 14:30, but DARK MICH FRINGES wouldn't work. I tried to move on, but DRMI still looks hopeless. 

LHO General
thomas.shaffer@LIGO.ORG - posted 08:09, Thursday 23 March 2017 (35035)
Ops Day Shift Transition

TITLE: 03/23 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 0Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 5mph Gusts, 3mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.19 μm/s
QUICK SUMMARY: Jim had issues with RF45 all night, but Richard swapped out the chassis this morning and we are trying to lock DRMI now after and initial alignment.

H1 ISC
richard.mccarthy@LIGO.ORG - posted 07:12, Thursday 23 March 2017 - last comment - 16:03, Thursday 23 March 2017(35033)
H1 Harmonic Frequency Generator Swapped
After a night of wasted science, (45Mhz Glitches) the Harmonic Frequency generator was swapped.  Hopefully this was the culprit causing the glitches in the RF45.  Serial number S1000796 was replaced with S1000798
Work Permit 6537
Comments related to this report
daniel.sigg@LIGO.ORG - 09:01, Thursday 23 March 2017 (35038)

RF demodulation phases for 2f, 3f, 4f, 10f and 15f might change with this swap.

richard.mccarthy@LIGO.ORG - 13:09, Thursday 23 March 2017 (35045)
Replace Attenuator on:

Freq  Value with 
18MHz +3    +2
27MHz +6    +2
36MHz +5    +4
45MHz +2    +1

91MHz 137MH No change.
To keep the input value at 10dbm.

Values based on Epics readbacks.

jeffrey.kissel@LIGO.ORG - 16:03, Thursday 23 March 2017 (35049)CAL, DetChar, OpsInfo
Tagging DetChar.

We've recovered nominal low noise after this swap -- how ever we're seeing a lot of different behavior within this first few minutes:
 - Some line features below 100 Hz are reduced
 - There is elevated 500 Hz rising as f (like shot noise) noise floor
 - Occasional comb in a similar region
 - 4-5 kHz ratty hump that comes and goes
 - incredible amount of omega glitch above 500 Hz

Just letting you know to keep your eyes peeled that this swap may mean several significant changes to the IFO that we may have to continue to rectify and/or deal with.
H1 General
jeffrey.bartlett@LIGO.ORG - posted 00:01, Thursday 23 March 2017 (35032)
Ops Evening Shift Summary
Ops Shift Log: 03/22/2017, Evening Shift 23:00 – 07:00 (16:00 - 00:00) Time - UTC (PT)
State of H1: Locked at NLN for 3 hours at 28.5W and variable range due to RF45 noise.       
Intent Bit: Observing
Support:
Incoming Operator: Jim
Shift Summary: Ran A2L DTT check – Pitch coherence is up to about 0.6 and Yaw is up to 0.8.
GRB alert – Both sites Observing, One hour stand-down.
Lockloss – Cause unknown. Tried relocking with no success. Ran initial alignment and relocked.
Back to Observing.
Shortly after relocking started to have issues with elevated RF45 noise, which is effecting range.
 
   Activity Log: Time - UTC (PT)
23:00 (16:00) Take over from Ed
23:10 (16:20) Ran A2L check script
23:52 (16:52) Drop out of Observing for Jenne to reload filters (aLOG #35023)
00:18 (17:18) Kyle – Going to Mid-X
00:31 (17:31) Kyle – Back from Mid-X
00:45 (17:45) Back to Observing
01:24 (18:24) GRB Alert – Stand-down for one hour
02:24 (18:24) End GRB stand-down
02:48 (19:48) Lockloss – Unknown
03:59 (20:59) Relocked at NLN and back to Observing
04:15 (21:15) Damp PI Mode-27
04:30 (21:30) Elevated RF45 noise effecting range
07:00 (00:00) Turn over the Jim
 
 
H1 PSL
jeffrey.bartlett@LIGO.ORG - posted 22:46, Wednesday 22 March 2017 (35029)
Check PSL Chillers (FAMIS #6515)
   Checked water levels and filters for the PSL Chillers. The water levels and filters are good. Closing FAMIS task.
H1 General
jeffrey.bartlett@LIGO.ORG - posted 22:09, Wednesday 22 March 2017 - last comment - 23:03, Wednesday 22 March 2017(35028)
RF45 Noise Depressing Range
   For the past 45 minutes or so the RF45 noise has been elevated above the reference. The range is currently down into the upper 40s Mpc. 
Comments related to this report
jeffrey.bartlett@LIGO.ORG - 22:52, Wednesday 22 March 2017 (35030)DetChar
  Mike L. called to inquire about the RF45 issue. Per his suggestion, I've informed Keita of the situation. As there is nothing ops can do at this time, will continue to monitor.
keita.kawabe@LIGO.ORG - 23:03, Wednesday 22 March 2017 (35031)CDS, DetChar

In the morning, let's replace the harmonic generator with a spare. If it still glitches it's probably not a glitchy harmonic generator.

In the past the harmonic generator was checked in the lab, but the "check" was for stationary noise and not the glitches (how can we "check" sporadic glitch that might or might not happen for a year?), and the same unit was put back in place.

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=21094

H1 General
jeffrey.bartlett@LIGO.ORG - posted 21:09, Wednesday 22 March 2017 (35027)
Ops Evening Mid-Shift Summary
   Recovered from earlier lockloss and back into Observing. The wind had been gusting up into the mid 30s, but has since laid down bringing down the microseism as well. After relocking the range has moved up to over 71Mpc. So far, after the relock the PIs have been behaving.   
H1 General
jeffrey.bartlett@LIGO.ORG - posted 18:28, Wednesday 22 March 2017 (35026)
GRB Alert
   01:24UTC (18:24) Received GRB alert. Spoke with LLO. Both sites good. Stand-down for one hour 
H1 ISC
jenne.driggers@LIGO.ORG - posted 16:37, Wednesday 22 March 2017 - last comment - 10:15, Friday 24 March 2017(35023)
0.43 Hz osc seen in PRC gain, POP DC, etc.

Upon entering the control room, I noticed that we have a low frequency oscillation in the PRC gain, POP DC, etc. on our front wall striptool.  Turns out, this is the same as what Jim documented last night in alog 34999, and likely comes from Sheila's changing of the oplev damping cutoff in alog 34988.

I would like to go back to the old 10 Hz cutoff that we used to have in the oplevs, to see if that fixes this.  However, Sheila noted to me that the old cutoff is zero history, no ramp, so we can't just go out of Observe and switch filters.  I'll need to change the filters to always on, few sec ramp, load the filters, then we can switch back.

Comments related to this report
jenne.driggers@LIGO.ORG - 17:46, Wednesday 22 March 2017 (35024)

[Jenne, Sheila]

Hmmm. Reverting the cutoff frequency filters did not fix the problem.  We're leaving them with the old 10Hz filters for now.

We also tried lowering the oplev gains by a factor of 8 on all test masses at the same time (in factor of 2 steps), but that caused CSOFT to start being unhappy, so we put them back to nominal before we lost lock.

We're going to go back to Observe since we don't have another idea right now of how to fix this.

As a note, it looks like this is upconverting with the 36Hz Cal lines to broaden them significantly, which is probably part of the reason we're at a reduced range right now.

jenne.driggers@LIGO.ORG - 18:15, Wednesday 22 March 2017 (35025)

Still no clever ideas, but it certainly seems like ITMY's oplev or something in the suspension is suspicious, and perhaps imposing noise through the ASC on the other optics.  All 4 test masses see the 0.43 Hz oscillation in pitch, but ITMY seems to have many harmonics and other "hair" in the oplev spectrum.  Not plotted, but ITMY yaw also sees the 0.43 Hz motion, but the other optics don't seem to see yaw problems.

EDIT to add spot position plot - spots on the test masses aren't moving very much over the last month, so it doesn't seem to be related to that. (Except ETMX yaw - still no idea why that's so scattered)

Images attached to this comment
beverly.berger@LIGO.ORG - 13:25, Thursday 23 March 2017 (35044)DetChar

Beverly, Andy

On 22 Mar, a line of glitches at about 3.3 kHz appeared in apparent coincidence with these ASC problems. A known, always present line at the same frequency shows glitching at about 0.43 Hz (see attached spectrogram). A previous alog (27488) referred to this line as an SRM mode at 3335 Hz. In fact, the SRM spectrum (see attached spectrum) developed a feature at 0.43 Hz on 22 Mar that was not present on 21 Mar. 

Images attached to this comment
jenne.driggers@LIGO.ORG - 10:15, Friday 24 March 2017 (35065)

We haven't checked out anything related to Beverly's suggestion yet since the 0.43 Hz hasn't seemed to be a problem in the last ~day, and we've had other things to worry about.  But, Sheila's 8Hz oplev cutoffs were in the guardian, so other than the lock that I had changed them back to 10Hz, they've been on the 8Hz cutoffs. 

The DARM spectrum is noticeably better below about 25Hz, so it's good that Sheila's new oplev cutoffs aren't causing any problems, and are just helping.

H1 General
jeffrey.bartlett@LIGO.ORG - posted 16:23, Wednesday 22 March 2017 (35022)
Ops Evening Shift Transition
Ops Shift Transition: 03/22/2017, Evening Shift 23:00 – 07:00 (16:00 - 00:00) - UTC (PT)
State of H1: IFO locked at NLN, at 29.1W and 61.7 Mpc  
Intent Bit: Observing
Weather: Wind is a Moderate Breeze gusting to a Fresh Breeze, Mostly clear and lower 50s  
Primary 0.03 – 0.1Hz: X & Y axis at 0.05um/s, Z axis at 0.01um/s 
Secondary 0.1 – 0.3Hz:  At 0.2um/s
Quick Summary: Wind and seismic are elevated. A2L Yaw coherence is at 0.6, Pitch is at or below the reference.    
Outgoing Operator: Ed
H1 General
edmond.merilh@LIGO.ORG - posted 16:02, Wednesday 22 March 2017 (35014)
Shift Summary -Day (supplemental)

22:08 Sudarshan, Suresh and Rick to EX

22:09 BRSX sensor correction turned off

22:21 Rick and company out

22:20 Robert out to LVEA to wrap up his testing so H1 can go back to Obeserving.

22:26 Spoke to Livingston. They Are back to Observing.

22:29 Robert out of LVEA. BRSX Sensor Correction turned back on.

22:32 Accepted some IM4 M1 P&Y diffs as per Sheila.

22:33 H1 back to Observing

16:00 Handing of to Jeff B

 

 

H1 PSL (PSL)
edmond.merilh@LIGO.ORG - posted 16:01, Wednesday 22 March 2017 - last comment - 08:52, Thursday 23 March 2017(35021)
PSL Weekly Report - 10 Day Trends

Nothing outstanding to report. Everything looks normal.

Images attached to this report
Comments related to this report
jason.oberling@LIGO.ORG - 08:52, Thursday 23 March 2017 (35037)

Agreed, everything looks normal.

H1 General
edmond.merilh@LIGO.ORG - posted 15:34, Wednesday 22 March 2017 (35020)
H1 back to Observing

22:33 65.3Mpc

H1 AOS (SEI, SUS)
nutsinee.kijbunchoo@LIGO.ORG - posted 15:22, Wednesday 22 March 2017 - last comment - 08:49, Thursday 23 March 2017(35017)
Optical Lever 7 Day Trends
Images attached to this report
Comments related to this report
jason.oberling@LIGO.ORG - 08:49, Thursday 23 March 2017 (35036)

Everything looks normal with these trends.

H1 ISC (ISC)
jenne.driggers@LIGO.ORG - posted 14:52, Wednesday 22 March 2017 - last comment - 15:29, Wednesday 22 March 2017(35013)
RF45 being bad :(

Tragically, about 20 min ago the RF 45 started glitching.  We were losing lock on Switch_to_QPDs twice before it started, so I think this isn't the #1 reason why we hadn't been locked for the first bit of time since I accidentally broke the lock. 

But, while trying to look at why we might be struggling, I noticed that the RF45 is glitching and jumping around.  It looks from the dataview plot attached like it started doing this right around 21:30:00 UTC.

Richard is in the CER trying to investigate, to see if there is anything obvious. 

Images attached to this report
Comments related to this report
jenne.driggers@LIGO.ORG - 15:17, Wednesday 22 March 2017 (35015)

The old plan of waiting around for a while seems to have worked yet again.  Mystery remains.

rich.abbott@LIGO.ORG - 15:27, Wednesday 22 March 2017 (35018)ISC
It would be interesting to see if there are any glitches in the observed LO drive monitors for this chassis coincident in time.  There have been the occasional RF problem with the LO on these devices which would be specific to the demodulator card if it was an LO amplifier problem.
jeffrey.kissel@LIGO.ORG - 15:29, Wednesday 22 March 2017 (35019)DetChar
Tagging DetChar for further investigation.
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