Displaying reports 51701-51720 of 83224.Go to page Start 2582 2583 2584 2585 2586 2587 2588 2589 2590 End
Reports until 20:06, Friday 09 December 2016
LHO General
corey.gray@LIGO.ORG - posted 20:06, Friday 09 December 2016 (32407)
Mid Shift Status

Locked for 3+hrs.  Rode through a couple of Solomon Island rumblers (L1 went down).  Also ran an A2L an hour or so after this lock (right as L1 was joining us).  H1 started off at a high range (almost 80Mpc, slowly dropped around 65Mpc & is back up to around 73Mpc.  Smooth saling.

H1 General
corey.gray@LIGO.ORG - posted 17:22, Friday 09 December 2016 (32406)
Back to OBSERVING!

As soon as H1 went up, L1 went down.

EQ levels subsided so immediately proceeded with locking (only hitch was a low X-arm for ALS & this was remedied with a slight TMSx tweek).  Made it to NLN with no issues.  

I saw we had quite a few Test Points open on the CDS Overview (some were 20+ for some PEM front ends).  I went about running a TP Clear on all of them (except H1CALEX which had 1).  In case you were interested the frontends I did a TP Clear on, had the following DCUIDs:  24, 30, 31, 75, 50, 54, 55, 60, 98, 99, 80, 118, 10, 19, 121, 88, 89, 91, & 84.

Shortly thereafter, I hammered down the MODE28 PI before it got raucous (phase sign flip).

Range is hovering around 75Mpc.

Transitioned OBSERVATORY_MODE from EARTHQUAKE to OBSERVING.

Looking at Violin Mode peaks on DARM, we have:

LHO General
corey.gray@LIGO.ORG - posted 16:17, Friday 09 December 2016 - last comment - 16:51, Friday 09 December 2016(32403)
Transition To EVE

TITLE: 12/10 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Earthquake
OUTGOING OPERATOR: Jeff
CURRENT ENVIRONMENT:
    Wind: 10mph Gusts, 6mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.34 μm/s
QUICK SUMMARY:

Comments related to this report
corey.gray@LIGO.ORG - 16:51, Friday 09 December 2016 (32405)

While double-checking locked doors (and front door knob also locked), I went ahead and turned OFF lights for weekend conditions, this included the Mechanical Room & Mass Storage Room. 

H1 General
jeffrey.bartlett@LIGO.ORG - posted 16:11, Friday 09 December 2016 (32402)
Ops Day Shift Summary
Ops Shift Log:12/09/2016, Day Shift 16:00 – 00:00 (08:00 - 16:00) Time -  UTC (PT)
State of H1: Relocking after being down due to EQ near the Solomon Islands
Intent Bit: Environment
Support: N/A
Incoming Operator: Corey

Shift Summary: The IFO was locked and observing for the past 5.5 hours. At 19:23 lost lock due to a Mag 6.9 EQ near the Solomon’s. Primary microseism is up to 8.0um/s, secondary is 1.5um/s. HAM6 ISI was the only tripped. I put the SEI_CONF LARGE_EQ_NOBRSXY.  

Put the SEI_CONF back to WINDY. Microseism has calmed down. Start relocking.     

Activity Log:Time - UTC (PT)
16:00 (08:00) Take over from Jim
16:10 (08:10) Damp PI Mode 28
17:45 (09:45) Ken – Going to Mid-X to work of dampers
17:48 (09:48) Bubba – Going to Mid-X to work on dampers
18:52 (10:52) Ken & Bubba – Back from Mid-X
18:56 (10:56) Chandra – Going to Mid-Y to work on CP4
19:23 (11:23) Lockloss – Mag 6.9 EQ near the Solomon Islands
19:46 (11:46) Ken – Going to mezzanine in the Mechanical building
20:10 (12:10) Chandra – Back from Mid-Y
21:05 (13:05) Chandra – Going to Mid-Y (WP #6394)
21:42 (13:42) Chandra – Back from Mid-Y
23:30 (15:30) Started relocking
23:33 (15:33) Kyle – Going to Mid-Y
00:00 (16:00) Turn over to Corey
LHO VE
chandra.romel@LIGO.ORG - posted 14:20, Friday 09 December 2016 (32399)
CP3 & CP4 overfill

Double the fun!

1:30 pm local

Finished installing TCs at CP4 exhaust. Needed to swap TC wires at beckhoff rack.

CP4 took less than 1 min. to overfill at 70% on LLCV. Returned to nominal 38%. I filled CP4 from beckhoff console at MY to verfiy LN2 flow out exhaust when TCs read below -30C.

CP3 took 36 min. to overfill at 50% on LLCV. Nominal at 19% (from previous 18%).

LHO VE
chandra.romel@LIGO.ORG - posted 14:10, Friday 09 December 2016 (32398)
CP3 Dewar readback

Dave Barker pointed out that CP3's Dewar level readback is noisy as he was writing an alarm script that looks at slope. Trending back 3 years, it looks like this noise comes and goes with cold weather, and is somewhat diurnal.

Images attached to this report
H1 General
jeffrey.bartlett@LIGO.ORG - posted 13:00, Friday 09 December 2016 (32397)
Ops Day Mid Shift

   IFO has been locked and Observing for 5.5 hours, when lost lock due to Mag6.9 EQ near the Solomon Islands. Primary microseism remains high but is starting to come down. Should be able to try relocking soon.

H1 PSL (PSL)
peter.king@LIGO.ORG - posted 12:43, Friday 09 December 2016 (32395)
reference cavity alignment
Attached are plots of the reference cavity transmission for the past week.  Plotted along with
the laser room temperature, and the reflection locking photodiode output.  The decay is not due
to any degradation of the pre-modecleaner transmission.

    Correction almost always involve a pitch alignment correction, most of which is the top
mirror mount in the periscooe.
Images attached to this report
H1 General (DetChar)
laura.nuttall@LIGO.ORG - posted 12:20, Friday 09 December 2016 - last comment - 12:35, Friday 09 December 2016(32394)
PI damping does not cause glitches

Terra asked detchar to investigate whether changing PI damping settings might cause glitches. Conclusion - they do not, at least for the examples I've seen.

I looked at 22 examples from alogs 31892, 31824, 31560, 31516, 31485, 31461, 31444, 31440, 31191 where operators reported changing the settings on modes 3, 26, 27 and 28 in either/both phase and gain. I plotted a 10 minute timeseries around the times reported in the alogs of channels SUS-PI_PROC_COMPUTE_MODE#_DAMP_GAIN and SUS-PI_PROC_COMPUTE_MODE#_PLL_PHASE and a spectrogram of GDS-CALIB_STRAIN of the same time. Two of the times I could not find any change in either the phase/gain so I really only looked at 20 examples.

Attached is an example where both the phase and gain of mode 28 were changed by the operator in alog 31485. The change in gain and phase makes no obvious glitches/change to the spectrogram. All other exmaples I have seen show no obvious change either. When pycbc live triggers have been available (because they only get generated when we're in oberserving) I can not find any noticeable change.

If you really want to look through all the plots yourself they are here

Images attached to this report
Comments related to this report
terra.hardwick@LIGO.ORG - 12:35, Friday 09 December 2016 (32396)

Thanks Laura!

PI phase and gain settings are currently unmonitored in observe SDF, so we can keep them that way. Note that saturating the ESD drive does couple into DARM, so if you ever try significantly increasing PI gains (say, above 15,000), it would be best to drop out of Observe. 

H1 GRD
jeffrey.bartlett@LIGO.ORG - posted 11:59, Friday 09 December 2016 (32393)
Reload SUS-PI Guardian

Ran LOAD on the SUS_PI Guardian to load new code, per Owl Shift operator.

H1 General
jeffrey.bartlett@LIGO.ORG - posted 11:57, Friday 09 December 2016 (32392)
Lockloss - 6.9 Mag EQ near the Solomon's

At 19:23 lost lock due to a Mag 6.9 EQ near the Solomon’s.

Primary microseism is up to 9.0um/s, secondary is 1.5um/s. HAM6 ISI was the only trip. I put the SEI_CONF LARGE_EQ_NOBRSXY.     

H1 AOS (AOS, SEI, SUS)
jeffrey.bartlett@LIGO.ORG - posted 11:22, Friday 09 December 2016 (32391)
Optical Lever 7 Day Trends

Posted are the OpLev trend plots for the past week. The BS summary plot show a steady downward trend. FAMIS #4705

Images attached to this report
H1 CAL (CAL)
aaron.viets@LIGO.ORG - posted 09:23, Friday 09 December 2016 (32389)
New GDS filters for LHO with correct inverse sensing function Foton file
I have made a filters file for LHO that includes the corrections made by Evan G. and Jeff K. (see https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=32329 ). The filters were made using revision #3929 of the calibration SVN and can be found here:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/GDSFilters/H1GDS_1165269650.npz

The parameters used to make these filters are:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/ER10/Common/params/IFOindepParams.conf
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/ER10/H1/params/H1params.conf
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/ER10/H1/params/2016-11-12/H1params_2016-11-12.conf
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/params/H1_TDparams_1165269650.conf
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/ER10/H1/Scripts/CAL_EPICS/D20161122_H1_CAL_EPICS_VALUES.m

Several plots are attached:
1) h(f) spectrum from CAL-CS and GDS 
2) Ratio of spectra (GDS / CAL-CS)
3) Residual correction filter
4) Control correction filter

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=32329
Images attached to this report
Non-image files attached to this report
H1 General
jeffrey.bartlett@LIGO.ORG - posted 08:26, Friday 09 December 2016 (32388)
Ops Day Shift Transition

Ops Shift Transition: 12/09/2016, Day Shift 16:00 – 00:00 (08:00 - 16:00) -  UTC (PT)

State of H1: IFO locked at NOMINAL_LOW_NOISE for past 2.5 hours. Power is 28.7W; Range is 72.0MPc
Intent Bit: Observing
Weather: Wind is a Light Breeze (4- 7mph), cold and partly cloudy, possible snow in PM
Primary 0.03 – 0.1Hz Currently at 0.09um/s 
Secondary 0.1 – 0.3Hz: Currently at 0.6um/s
Quick Summary: Some continued aftershocks near the Solomon’s, but not large enough to effect IFO, at this time. A2L coherence is a bit off the reference. If this continues will run the A2L script at first opportune time.    
Outgoing Operator: Jim
H1 General
jim.warner@LIGO.ORG - posted 08:09, Friday 09 December 2016 (32386)
Shift Summary

TITLE: 12/09 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 72.1525Mpc
INCOMING OPERATOR: Jeff
SHIFT SUMMARY: Troubles with PI, seem to be handled now.
LOG:

Had troubles with PI that kept breaking lock as the IFO heated up, required modifying some filters, but it seems stable now.

There is a pending PI guardian change that still needs to be loaded, but I didn't want to knock us out of observing, I've told Jeff.

H1 AOS
jeffrey.bartlett@LIGO.ORG - posted 14:56, Thursday 08 December 2016 - last comment - 14:29, Friday 09 December 2016(32368)
CPS Sensor Spectra (FAMIS #6875)
   Posted are the plots for the CPS Sensor Spectra. 
Images attached to this report
Comments related to this report
richard.mittleman@LIGO.ORG - 06:49, Friday 09 December 2016 (32384)

HAM 2 needs a second look

jeffrey.bartlett@LIGO.ORG - 14:29, Friday 09 December 2016 (32400)

Reran the HAM2 HAM3 CPS Sensor Spectra. New plot is posted below. Between 20 ans 60Hz, HAM2 looks a bit better. 

Images attached to this comment
LHO VE (DetChar)
kyle.ryan@LIGO.ORG - posted 14:15, Thursday 08 December 2016 - last comment - 09:50, Friday 09 December 2016(32367)
Need DetChar to scrutinize data

We have a diagnostic setup at BSC8 that we need to run for several consecutive days.  This setup utilizes rotating shaft vacuum pumps that have the potential of effecting the IFO data.  Prior to the start of O2, we had Robert S. monitor the IFO signal(s) while it was locked and in "Low Noise" both with the pumps on and also off, i.e. we did "on/off" tests (see alog entry 31802).  Additionally, and on more than one occasion, we had ran these for several consecutive days during which the IFO experienced long lock stretches at good sensitivity.  As such, we were hoping that someone could examine the pertinent IFO data during the following two time segments to look for any evidence of these pumps running.  In both cases, the pumps in question were running continuously:  


November 24th, 0230 UTC to November 29th, 1800 UTC and

December 5th, 1900 UTC to December 7th, 0035 UTC.  

Comments related to this report
keith.riles@LIGO.ORG - 20:48, Thursday 08 December 2016 (32374)DetChar
Attached is a zipped tar file of spectral comparisons for the two pump-on periods cited
and for an intervening pump-off period. Since I don't know what the pump frequency
is supposed to be, I'm not sure where to focus attention, but I'm not seeing gross differences
other than higher 60-Hz harmonics in both pump-on periods (is that expected from
the pumps?), along with the overall greater excitation / upconversion of violin modes and
the presence of  "silent" calibration lines at 22.3 and 30.1 Hz in the first pump-on period. 

Here are the FScanned data intervals used:

pumpon-1 -- 23.5 hours of SFTs collected between Nov24th, 0230 UTC and Nov 29th, 1800 UTC
pumpon-2 -- 11.5 hours between Dec 5th, 1900 UTC and Dec 7th, 0035 UTC
pumpoff -- 78 hours between Nov 30, 14:00 UTC and Dec 5th, 14:00 UTC

If there are particular frequencies where I should be expecting disturbances,
let me know and I'll do some zooming. 
Non-image files attached to this comment
keith.riles@LIGO.ORG - 09:50, Friday 09 December 2016 (32390)
Kyle informed me offline that the pumps run at 1720 RPM (28.667 Hz) 
with small turbos running at 90,000 RPM (1500 Hz). Attached are zooms
of bands around the first four harmonics 28.667 Hz (band sizes increase
linearly with harmonic number) and around 1500 Hz. I don't see anything
jumping out at me in any of the low-frequency bands that indicates an 
artifact restricted to pump-on times. 

The region around 1500 Hz is harder to interpret because of different average 
quad violin mode excitations and associated up-conversion.

Fig 1 - 28.5-28.8 Hz
Fig 2 - 57.0-57.6 Hz
Fig 3 - 85.5-86.4 Hz
Fig 4 - 114.0-115.2 Hz
Fig 5 - 1480-1520 Hz
Images attached to this comment
H1 SUS
thomas.shaffer@LIGO.ORG - posted 05:15, Thursday 08 December 2016 - last comment - 15:31, Friday 09 December 2016(32354)
PI slightly rung up modes that we are not damping

It seems like there are some PI modes that we are no longer damping that are slightly run up according to the dtt. I also wonder if the peaks at around 13000hz are modes that we had not had issues with before, or maybe something else entirely? I don't see any mention of them on the PI medm and they are currently the highest. I will try to damp some of the other ones if they get any higher.

The attached shows the PI dtt just after reaching low noise.

Images attached to this report
Comments related to this report
thomas.shaffer@LIGO.ORG - 06:01, Thursday 08 December 2016 (32356)

Well I think things are stable now. I ended up flipping the sign for the both the phase and gain on mode 27. Mode 26 also came up and changing the phase got it to, very slowly, go down. I took some screen shots of the dtt template at 20min, 26min, and 32min into the lock. The modes that the Striptools said were ringing up, didnt necessarily agree with the dtt. I dont remember how much the modes can shift in frequency, but it seems like some of them were off by a couple of hz. 

Images attached to this comment
terra.hardwick@LIGO.ORG - 11:58, Thursday 08 December 2016 (32364)OpsInfo

A couple things:

  • I'm not sure what you're referencing that seems 'a couple Hz off', could you elaborate? I checked the band pass filters against the frequency of the peaks at the times you listed and the most I found was Mode28 was off by 1 Hz. I have since changed the BP filter to account for this shift. 
  • Remember that if a peak's frequency in DTT is different than the bandpass filter frequency, you should switch to a different band pass. There are explicit directions in the PI Wiki (which you can open from the PI medm screen and which I just updated to make more clear) and I've walked through this process individually with each operator. If something is still unclear, you can always still call me at anytime (number on the whiteboard). This shouldn't be much of an issue these days but is worth checking if you're having damping problems.
  • Modes 27 and 29 have to be carefully watched during the first hour of lock. These have been successfully damped for weeks now but must be reacted to immediately. 
  • Again, if you lose lock from a PI, you must wait in DC readout to give that mode time to ring down. You can watch the ringdown in DTT. If you try locking again, the mode will still be rung up.
  • There are some modes that always have higher amp, such as the 13kHz modes TJ noted, that are not unstable - TJ that DTT from low noise you first posted is totally normal. You can always look at a reference from an eariler stable lock time to compare the amplitudes. I will add a good reference to the PI DTT in the background so it's easy to see what's 'good'
  • Regarding DTT and StripTool not seeming to match - we use different error signals for different modes, while the DTT is just looking at one of those signals. The result is that Modes 27,28 look very rung up on the StripTool but their peaks in the DTT dont look so high. This is done on purpose, because those modes need to be damped faster. 

Please any operator contact me at any time if help/explanations/etc is needed.

thomas.shaffer@LIGO.ORG - 15:31, Friday 09 December 2016 (32401)

For the couple hz off thing, I was mainly refering to the frequencies listed on the medm above the modes. I'm not sure how accurate these are suppose to be, but like mode 27 says 18041, and the dtt was saying that 18038 seemed to be more rung up (see second attached). I didn't remember how much they shifted, and I did not look at the actual filters themselves at the time.

I was able to make it work (on the second try) with just changing phase and gain so I didn't look into it too much after that. But, yes, following your instructions and changing the BP would have been next on the list.

In alog32385 you mention that you will put a reference trace to show what is normal and what is not. I would love this because I looked at the dtt picture that is on the wiki and saw that it was much different. Either way, it was a good learnign process for me since I have only ever had to change phases for PI modes.

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