Displaying reports 55961-55980 of 86075.Go to page Start 2795 2796 2797 2798 2799 2800 2801 2802 2803 End
Reports until 07:58, Friday 28 October 2016
H1 General (OpsInfo)
cheryl.vorvick@LIGO.ORG - posted 07:58, Friday 28 October 2016 (30956)
Ops Owl Summary: locked 7 hours

State of H1: locked in NLN 7 hours

Details / Activities:

My TCS alog 30955.

As I watch, range has held steady around 60MPc.

H1 General (DetChar, OpsInfo)
cheryl.vorvick@LIGO.ORG - posted 01:07, Friday 28 October 2016 (30950)
H1 in NLN and no changes being made as of 8:04UTC - waiting 90 minutes to change TCS starts now

State of H1: Nominal Low Noise

Range: 68MPc

Target for changing TCS: 9:10UTC

PEM injections completed for tonight

H1 General (OpsInfo)
cheryl.vorvick@LIGO.ORG - posted 00:33, Friday 28 October 2016 (30949)
Owl Ops start of shift:

State of H1: relcoked in Low Noise

Outgoing Ops: TJ

On Site: Robert, doing PEM injections in the LVEA

Details:

LHO General
thomas.shaffer@LIGO.ORG - posted 00:00, Friday 28 October 2016 (30948)
Ops Eve Shift Summary

TITLE: 10/28 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY: Locking is much better than the past few days, the only thing to mention is that BS seems to be drifting in pitch at times. While locking DRMI I'll adjust it, and meanwhile AS90 will slowly drift down, adjusting the BS P again seems to bring it right back to was. After locklosses BS P always seemed to be off by a bit as well. The MICH ASC error signal seems to be the noisiest during lock, but maybe this is normal, I can't remember. I didn't want to mess up Robert while he was doing work so I haven't tried adjusting it to maybe correct for the downward trend in the range.
 

H1 ISC
sheila.dwyer@LIGO.ORG - posted 18:25, Thursday 27 October 2016 - last comment - 12:00, Friday 28 October 2016(30947)
PR2 roll mode notched

The PR2 Roll mode has been reduced in the DARM spectrum by adding 1Hz wide bandstops (centered at 40.9Hz) to all the top mass damping loops for PR2.  

Once these were on the line in DARM at 40.934Hz is gone.  There are other HSTS roll modes which now show up, 40.918 (MC2 or SR2 maybe) and something smaller at about 40.937Hz. 

Comments related to this report
jeffrey.kissel@LIGO.ORG - 12:00, Friday 28 October 2016 (30962)DetChar, SUS
Link 

For the record, Sheila saved the modified filter file on Oct 27 2016 at 16:55 PDT, or Oct 27 2016 23:55:00 UTC. She says she hit load on the filter banks individually "pretty much right after."

I've now subsequently loaded the entire filter file from the GDS_TP screen on Fri Oct 28 2016 at 10:38:53 PDT (Oct 28 2016 17:38:53 UTC)

The filter design string is ellip("BandStop",4,1,60,40.4,41.3)gain(1.12202) and lives in FM9.

Also, I attach a comparison between calibrated DARM ASDs from last night's long lock stretch against one from several nights ago. The BW is a delightful 0.3 [mHz] -- hooray for IFO stability! The conclusion is a little different from Sheila's above conclusion: the PR2 R3 mode @ 40.93 Hz is not *gone*, but it has definitely been reduced by an order of magnitude. Interestingly, the 27.41 [Hz] V3 mode also is a reduced by a factor of 0.70.

Indeed, there are other R3 modes now exposed at 40.8687, 40.8775, 40.9171, in addition to the residual of the PR2 mode at 40.9356 [Hz]. That being said, it looks like given the density of modes around 40.9, it'll be fine to use the same notch design for all HSTS.

We'll successively notch the R3 mode out of every HSTS, and see what disappears.

By looking at my 2014 comparison between LLO, LHO, and a Low Noise damping loop design, G1401291, at first glance since the filter only distorts the phase at 20 Hz by 2 [deg], we should have plenty phase margin to notch out this mode in every suspension. But do not that LHO still has a complete mess of a design -- pretty much all the SUS have different gains and filter designs. So, we'll do so with caution. Even more so if we want to notch the V3 mode.
Images attached to this comment
LHO VE
chandra.romel@LIGO.ORG - posted 16:42, Thursday 27 October 2016 - last comment - 09:27, Friday 28 October 2016(30945)
CP4 bypass exhaust valve open again 
Exhaust pressure at CP4 was at 4 psi in PI mode so I opened up the bypass valve again.
Comments related to this report
chandra.romel@LIGO.ORG - 09:27, Friday 28 October 2016 (30960)
Link 

Pump acts much better with bypass exhaust valve open, so that will be the nominal state for now.
Images attached to this comment
H1 General
travis.sadecki@LIGO.ORG - posted 16:00, Thursday 27 October 2016 (30938)
Ops Day Shift Summary

TITLE: 10/27 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: TJ
SHIFT SUMMARY:  Locked at NLN for the first couple hours of my shift.  Robert doing PEM injections during this period until lock was broken due to me forgetting to turn off the BRS and Robert getting too close to it.  Middle part of the day was Betsy cleaning the PSL viewport.  Then we immediately had another EQ when they finished.  Relocking commenced in the last couple of hours of my shift.
LOG:

15:00 Robert to LVEA doing PEM injections.  Took IFO out of Observing mode due to the injections.

16:40 Robert to EY for PEM inj.

17:45 Betsy, Robert, Peter, Richard to LVEA

17:50 Peter out

17:52 Chandra to MY

19:00 Fil to LVEA

19:08 Fil out

19:30 Fil to LVEA

20:02 Richard to LVEA

20:50 Betsy, Robert done

Note: The dust monitor PSL 102 has been alarming on and off all day.  See attached screenshot for the trend for today.  The thresholds are 70 for minor alarm and 100 for major for both particle sizes.

 

Images attached to this report
H1 SUS
betsy.weaver@LIGO.ORG - posted 15:51, Thursday 27 October 2016 (30937)
PSL->HAM1 viewport cleaned via First Contact

Betsy, Robert

 

When the IFO broke lock around 11am, it was decided that we should go clean the viewport window on the South side of the HAM1 chamber which the PSL beam enters (see pix of inspection prompting this at alog 30867).  Travis lowered the power of the PSL via the rotation stage to 0.0 and we also locked out the rotation stage and the light pipe out on the floor.  We then decoupled the light pipe from the HAM1 port and slid the unit back about a foot.  We then proceeded to do a spray-on First Contact cleaning using the "canning cone" as described in procedure E1600263.  We let it dry ~30 mins before pulling the sheet off, however 2 small fragments of FC tore off and remained on the window just below center.  A second sheet was applied, but it again left a small fragment near the bottom of the window.  This time I just painted a stripe across the fragment and pulled it in a 3rd attempt - Robert and I reconciled that this was low enough to be well out of the beam path if I left a streak.  Lighting was poor and with laser goggles made for a difficult cleaning.  Otherwise, the cone and procedure worked well.  I'll add to spray more than 3 layers next time as this may have made for a more sucessful first pull.

 

Pix are of the 1st and 2nd FC sheet followed by the 3rd little stripe pull.  The last picture is the PSL beam centering on the viewport.  The beam goes through the viewport just below center, and we see a visible improvement of the scatter points in that area due to the cleaning(s).  Note, there is ring of particulate outsid eof the FC sheet pull area, but this is covered by the lightpipe mounting plate which reduced the beam view to the window.

Images attached to this report
H1 SUS (SUS)
travis.sadecki@LIGO.ORG - posted 15:21, Thursday 27 October 2016 (30940)
ETM Charge Measurements

During the downtime while Betsy was cleaning windows, I took charge measurements for both ETMs.  The script completed successfully, but I have not looked at the data or processed the results.  I'll leave that to those in the know.

LHO VE
chandra.romel@LIGO.ORG - posted 15:20, Thursday 27 October 2016 (30939)
X & Y end station pressure trends 
Pressure trends since late Feb. 2016 at X and Y end stations, showing events such as NEG regen, 250m IPs on/off, RGA bakes, scheduled power outage.

Note: data not available for continuous trend prior to late Feb.
Images attached to this report
H1 CDS (AOS, CDS)
filiberto.clara@LIGO.ORG - posted 14:45, Thursday 27 October 2016 (30936)
Power Cart/Transformer, HAM4, and HAM5 OP Levers Powered Off

WP 6284

The power cart/transformer along the output arm was powered off this afternoon. The following items were disconnected before powering off the transformer:

HAM 4 Op Lever
HAM 5 Op Lever
HWS Cameras (X&Y)
HAM 6 camera

Jason adviced we could leave the op levers powered off. The cameras power supplies were moved to different circuits and powered back on.

F. Clara, R. McCarthy

H1 SEI
patrick.thomas@LIGO.ORG - posted 14:11, Thursday 27 October 2016 - last comment - 16:40, Thursday 27 October 2016(30935)
H1 ISI CPS Sensor Noise Spectra Check 
FAMIS Request 6869

There is a bump between 20 and 40 Hz in the spectra most clearly for HAM2, HAM5 and HAM6. The ITMY V3 trace is above the nominal.
Images attached to this report
Comments related to this report
hugh.radkins@LIGO.ORG - 16:40, Thursday 27 October 2016 (30944)
Link

Thanks Patrick.  Jim and I are looking into the bumps in the HAM spectra.  The ITMY noise isn't too alarming yet.  It is good if the operator compares the current spectra with the previous; something I will do too.

LHO VE
chandra.romel@LIGO.ORG - posted 11:20, Thursday 27 October 2016 - last comment - 16:50, Thursday 27 October 2016(30931)
CP4 in manual mode for now 
Running some experiments with CP4 RE: noise. Set LLCV at 29% open in manual mode with bypass exhaust valve closed to see if signals settle down.
Comments related to this report
chandra.romel@LIGO.ORG - 15:33, Thursday 27 October 2016 (30941)
Link 

I reset the offset in PID to 32 (was 40) which is closer to nominal value after Dewar fill. I also adjusted the lower limit % open from 20 to 25 to avoid warming transfer line, since the LLCV likes to sit at lower limit in PI mode.
Images attached to this comment
chandra.romel@LIGO.ORG - 15:50, Thursday 27 October 2016 (30942)
Link 

Comparing CP4 pump level in manual mode from June and now. Today is much noisier than back in June.
Images attached to this comment
chandra.romel@LIGO.ORG - 16:50, Thursday 27 October 2016 (30946)
Link 

Here is CP3 trend before it failed last Dec.
Images attached to this comment
H1 TCS
jeffrey.bartlett@LIGO.ORG - posted 06:49, Thursday 27 October 2016 - last comment - 23:24, Saturday 29 October 2016(30920)
TCS Laser Noise

Kiwamu saked the ops to run some TCS laser noise measurements.

SETUP:

Started the run: 

    TSC X - Initial Power = 0.2W                     TSC Y - Initial Power = 0.0W

Time Power   Time Power
03:00 0.3W   03:00 0.1W
04:30 0.4W   04:30 0.2W
         
         
         
         
         
         
         

At 05:08 Lost lock due to a Mag5.8 EQ in Alaska.

Comments related to this report
travis.sadecki@LIGO.ORG - 15:58, Thursday 27 October 2016 (30943)
Link

I only managed to get one more data point for both arms:

15:30 utc:  TCSx at 0.5W for 90 minutes.

                   TCSy at 0.3W for 90 minutes.

cheryl.vorvick@LIGO.ORG - 03:04, Friday 28 October 2016 (30952)OpsInfo
Link

Oct 28, 10:03UTC, TCSX power set to 0.6, TCSY power set to .4

cheryl.vorvick@LIGO.ORG - 04:32, Friday 28 October 2016 (30953)OpsInfo
Link

oct 28, 11:32UTC, change X from 0.6 to 0.7, changed y from 0.3 to 0.4

cheryl.vorvick@LIGO.ORG - 06:28, Friday 28 October 2016 (30954)
Link

oct 28, 13:27UTC, tcsx raised to 0.8, tcsy raised to 0.5

cheryl.vorvick@LIGO.ORG - 07:00, Friday 28 October 2016 (30955)
Link

As range dropped and arm signals got more noisy I feared H1 was about to lose lock, and touched up TMSX and TMSY alignment.  Hopefully this didn't invalidate the data for TCS analysis.

Tweaks by TMS:

  • tmsx pitch 12:16UTC, 12:27UTC
  • tmsx yaw 9:56UTC
  • tmsy pitch 12:29UTC, 12:47UTC, 13:39UTC
  • tmsy yaw 12:48UTC,13:30 to 13:38UTC

Tweaks and TCS changes by timeline:

  • 9:56UTC
  • 10:03UTC - changed TCS
  • 11:32UTC - changed TCS
  • 12:16UTC
  • 12:27UTC
  • 12:29UTC
  • 12:47UTC
  • 12:48UTC
  • 13:27UTC - changed TCS
  • 13:30 to 13:38UTC

 

 

 

 

travis.sadecki@LIGO.ORG - 15:26, Friday 28 October 2016 (30967)
Link

15:05 UTC: TCSx at 0.9W for 45 min.

                     TCSy at 0.6W for 45 min.

jim.warner@LIGO.ORG - 23:24, Saturday 29 October 2016 (30999)
Link

At 4:43 UTC today (10/30, or (10/29 still PST)), after Robert left, I changed TCSY to .2W, per Cheryl's suggestion left with Corey. TCSX is still at .4W.

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