Beginning hardware injection test. The schedule will be updated with: 1128657857 1 1.0 ringburstinj1a_1126259456_ 1128658037 1 1.0 ringburstinj1b_1126259456_ 1128658217 1 1.0 ringburstinj2a_1126259456_ 1128658397 1 1.0 ringburstinj2b_1126259456_ 1128658577 1 1.0 ringburstinj3a_1126259456_ 1128658757 1 1.0 ringburstinj3b_1126259456_ 1128658937 1 1.0 ringburstinj4a_1126259456_ 1128659117 1 1.0 ringburstinj4b_1126259456_ 1128659297 1 1.0 ringburstinj5a_1126259456_ 1128659477 1 1.0 ringburstinj5b_1126259456_ 1128659657 1 1.0 ringburstinj6a_1126259456_ 1128659837 1 1.0 ringburstinj6b_1126259456_ 1128660017 1 1.0 ringburstinj7a_1126259456_ 1128660197 1 1.0 ringburstinj7b_1126259456_ 1128660377 1 1.0 ringburstinj8a_1126259456_ 1128660557 1 1.0 ringburstinj8b_1126259456_ 1128660737 1 1.0 ringburstinj9a_1126259456_ 1128660917 1 1.0 ringburstinj10a_1126259456_ 1128661097 1 1.0 ringburstinj11a_1126259456_ 1128661277 1 1.0 ringburstinj12a_1126259456_ 1128661457 1 1.0 ringburstinj13a_1126259456_ 1128661637 1 1.0 ringburstinj14a_1126259456_ 1128661817 1 1.0 ringburstinj15a_1126259456_ 1128661997 1 1.0 ringburstinj16a_1126259456_
Locked in LOW_NOISE at 22.2W, 68Mpc range. LHO has been in Observation mode for past 10 hours. LLO has also been locked with comparable range during this stretch. Wind is calm (1 to 3 Mph); Seismic activity has been quite during the shift. There have been a few ETMY saturation events, but have not observed any problems with the RF45 EOM.
Title: 10/11/2015, Evening Shift 23:00 – 07:00 (16:00 – 00:00) All times in UTC (PT) State of H1: At 23:00 (16:00) Locked at NOMINAL_LOW_NOISE, 22.2W, 70Mpc. Outgoing Operator: TJ Quick Summary: Environmental conditions are good. IFO in Observing mode. All appears to be normal.
Title: 10/11 Day Shift 15:00-23:00 UTC (8:00-16:00 PST). All times in UTC.
State of H1: Unlocked, high winds and high microseism
Shift Summary: Locked until 21:24, haven't been able to relock since due to environment issue.
Incoming operator: Jeff B.
Activity log:
J. Kissel, M. Oliver Miquel and I are doing some fun Sunday afternoon investigations of the 1 [Hz] comb for the CW group (see LIGO wiki page). Since we see that the power of the comb evolves with time, we've gathered some DELTAL EXTERNAL data as a test point to compare it against the version stored in the frames. Accessing the test point via DTT opened up a test point, naturally. One would have nominally expected opening up test points on any front end to take us out of observation mode BUT CAL-DELTAL_EXTERNAL happens to be computed on the same front end as the continuous wave injections, which -- because they need to access the H1:CAL-INJ_CW_EXC test point continuously -- has been flagged as "OK to have test points activated." (Note, this is why Giles, the H1 IFO automated voice robot, announced that CW injections had started when I hit "start" on the first bit of data gather in the DTT session). Of course, this is a monitor test point, so it had zero effect on the functionality/operation of the IFO, so remaining in observation mode was totally acceptable (even though admittedly, we didn't think of it when getting started). The test point was activated at 19:25 UTC (12:25 PDT) to 20:22 UTC (01:22 PDT). Stay tuned for analysis of the data.
Jeff Kissel noticed a ~300hz line in the glitch gram on the control room wall. Seems like it started with this lock but has been getting worse. Screen shots attached.
Looks like the peaks from the PSL periscope. See this alog for some details. I don't think we need to do anything about them right now, since it seemed like the IFO was hard to lock. I haven't seen them causing many problems for the search.
Observing at ~70Mpc.
Winds have picked up a bit, around 15-20mph, so I am not sure if this lock will hold with these blends. On the front Striptool AS90 has a fairly large oscillation.
Microseism seems to be on its way down, very slowly. We are now in a range of .3-.5 um/s.
LLO is still observing as well.
Observing at ~75 Mpc. LLO is also in observing.
Wind < 10mph
Microseism - High (blends are changed to counter this, see alog22410)
Jim W. suggestd that we try out the 45mHz blends if we can't lock due to the high microseism. Just before I came on shift, Travis and Sheila switched them over for the X and Y directions on BS, ETMY, EMTX, ITMY, and ITMX. They decided to do this because of the low winds and high microseism. This seemed to have helped us out quite a bit. Before the change, they struggled getting to lock DRMI, with them switched it only took us a few tries before we were all the way to Nominal Low Noise.
I will be accepting these blend changes in the SDF so we can move into Observing.
Furture operators should change them back if the winds pick up (Sheila says anything above 20 might be too high for these blends), but keep in mind this may drop lock.
For future reference the wind had not gusted above 15 mph for about an hour or so before Travis and I changed the blends, and the microseism is at about 0.5 um/sec in the 100-300mHZ BLRMS now. Before we changed the blends, ITMX optical lever saw about 0.5 urad peak to peak motion, and single arms were not even locking. (ETMX was not moving as much as the ITM) Changing the blends reduced the motion to more like 0.1 urad or even less.
Here are SDF shots so operators know what to bring it back to.
Unfortunately you won't be able to use the SDF system to revert these filters. If you do that you will likely trip the ISI, violently, and it will take longer to recover. You will have open the ST1 BLENDS screen for each ISI and select the appropriate blend from there.
Back to Nominal Low Noise after being out for ~19hours. LLO is still down so Sheila will run the A2L script and then we will clear up the SDF and move on to Observing.
Note: We are currently running with the 45mHz blends in the X and Y directions for all BSC ISI's to cope with the microseism.
Marie's modification of Hang's A2L script ran sucsesfully, and gives us better fits than we had before. Fits are attached. Most of them look good, although ETMY is not a great fit I accepted the new gains anyway. Now that this is working we would like to run this somewhat regularly (about once a day, especially at the begining of lock stretches) for a week or so using single IFO time to track how much our beam spot positions are drifting on the optics. This is covered under WP5552, although we should discuss tomorow how often we are going to do it.
The scripts can be found in userapps/isc/common/scripts/decoup
to check the decoupling, run ./a2l_min.py
when it is done run ./stop_osc.py to clear up SDF diffs. The whole thing takes about 7 minutes.
The script will tell you the names of files where the data is stored for the fits (in the directory /rec).
Josh, Andy
Yesterday's hveto page found a very constant rate of 30-40Hz glitches in DARM were vetoed by a population of 10-15Hz glitches in the End-Y QPDs (ASC-Y_TR_{A,B}_{NSUM,YAW,PIT}_OUT_DQ). Fig1 shows the time/freq of the DARM triggers and the ASC-Y triggers that vetoed them, Fig 2 shows the time/freq of all DARM triggers and the ones that got vetoed, and Fig 3 shows how the ranking statistic found all ASC-Y channels to be correlated. A .txt file with the times of vetoed DARM triggers is attached in case folks want to look at other channels around those times.
Fig 4 shows DARM, figs 5,6 show ASC-Y channels, figs 7,8 show zoomed specgrams to see the frequency. What we see are strong scattering arches around 8 and 16 Hz in all of the End-Y QPD channels, at the same time as similarly shaped fringes in DARM around 48Hz. I think DARM (more sensitive to scatter, potentially, at higher frequencies) is seeing the 6th overtone of the 8Hz arch (multiple reflections?). The higher overtones are sometimes visible in the QPDs too.
So...what scatterer/optics is moving too much? We know [1] that f_fringe(t) = abs(2 v_sc(t) / lambda). Where v_sc(t) is the time derivative of the position of the scatterer x_sc(t). The time between peaks is about 3.5 seconds, but that is half the period because of the abs() so it's a ~7 second period or 0.14Hz motion of the scatterer.
Note: We checked and the beam diverter is closed (H1:SYS-MOTION_Y_BDIV_A_POSITION = 1).
Note 2: Today's hveto page hasn't finished yet, but no reason to believe this isn't happening still.
[1] Accadia, T., et al. "Noise from scattered light in Virgo's second science run data." Classical and Quantum Gravity 27.19 (2010): 194011.
It probably won't surprise anyone to learn that ETMY top-stage motion correlates pretty well with these fringes. Though, likely lots of things are moving in this way following the high microseism.
Title: 10/11 DAY Shift: 15:00-23:00UTC (8:00-16:00PDT), all times posted in UTC
State of H1: Unlocked since my shift yesterday
Outgoing Operator: Travis
Quick Summary: Due to high winds and high microseism, the IFO hasn't been locked since my shift yaterday
Title: 10/11 Owl Shift 7:00-15:00 UTC (0:00-8:00 PST). All times in UTC.
State of H1: Aligning
Shift Summary: Unlocked when I arrived due to high winds. Unable to complete initial alignment due to many issues I haven't seen before. Called Sheila and she volunteered to come to the site to help. When Sheila arrived, she noticed that microseism was high enough that it was giving me troubles locking. We decided to try Jim's 45 mHz ISI blends, which helped enough to get further than I previously had. However, the BS ISI stage 2 tripped after a few minutes.
Incoming operator: TJ
Activity log:
8:23 cleared H1IOPASC0 timing error
I ran a BruCo scan for LHO. The full report is available here:
https://ldas-jobs.ligo.caltech.edu/~gabriele.vajente/bruco_lho_1128339017/
Here is my excerpt:
Beside these, there are few more puzzling coherences at higher frequencies:
453 Hz ASC-REFL_A_RF9_I_YAW and RF45
485 Hz ASC-REFL_A_RF9_I_PIT and RF45 / ISI-HAM2_BLND_GS13RY_IN1_DQ
991.5 - 996 Hz / 1004.5 Hz ASC-OMC_A/B_SUM_OUT
1954.5 Hz OMC-LSC_I_OUT
2449.0 Hz / 2458.5 Hz LSC-PRCL_OUT
In the region between 3300 Hz and 3400 Hz SRCL gets to quite high coherence
3619 Hz PRCL / SRCL / LSC-REFL_SERVO_CTRL_OUT / LSC-MCL_IN1/OUT
We see a line in the DARM spectrum at 2450Hz during the first few hours of some lock stretches, which corresponds to the BS butterfly mode frequency (See Keita's alog 17186.) Could this be the cause of the 2449Hz coherence you see? in PRCL?