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.

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.

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.

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.

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

Working on relocking.  I have been struggling with alignment for a while, but with a little coaching from Sheila, I'm getting there.

Activity Log: All Times in UTC (PT)

23:00 (16:00) Take over from TJ
23:15 (16:15) Complete initial alignment. 
23:16 (16:16) Trying to relock
23:37 (16:37) Sheila left the site
00:00 (17:00) Put IFO in down state until wind and seismic calms down.  
02:05 (19:05) Robert S. left the site
02:15 (19:15) Wind below mostly 30 mph - trying to relock
02:35 (19:35) Wind back up, gusts near 40 mph– Cannot get past LOCKING_ALS, will wait for things to settle a bit more
04:18 (21:18) Wind up and down; Seismic still high. Tried relocking with same negative results 
04:43 (21:43) After 12 lockloss at LOCKING_ALS in 12 locking attempts and now seeing wind gusts up to 50+ mph, put the IFO in a DOWN state waiting for Mother Nature to relax  
06:28 (23:28) Wind dropping but still gusty, seismic activity still high. Going to give locking another try
07:00 (00:00) Turn over to Travis


End of Shift Summary:
Title: 10/10/2015, Evening Shift 23:00 – 07:00 (16:00 – 00:00) All times in UTC (PT)

Support: Sheila, Elli

Incoming Operator: Travis

Shift Summary: 
- After many tries cannot get past ALS locking state. Wind still over 35 mph with gusts to mid-50s. Will wait until settle down before trying to relock.

- Turned on Jim W. 45 mHz ST1 blends on ITMY while trying to lock (04:18 to 04:43). Saw no difference in the behavior of Y and X during ALS locking. Saw no apparent difference in behavior of the ALS locking with the 45 mHz or Quite_90 ST1 Blends.  
- Wind strong and gusty all shift. Seismic activity also high all shift. The wind is still in the upper 20s and gusty, although it is trending lower. In the past 30 have been able to get to LOCK_DRMI_1F before lockloss. Conditions are improving.  

   Wind had settled a bit (in the teens and 20 mph range) but seismic activity still high. I tried to relock using the 45 mHz Blends, supplied by Jim W, on ITMY. There was no observed difference in the locking/lockloss behavior with the 45 mHz or Quite_90 Blends. I restored the Quite_90 Blends on ITMY.

   Note: While trying to relock this time the wind came back up into the 20s and 30s with several gusts in the 40s, and a couple of gusts over 50 mph. I don't know how good a test of the 45 mHz Blends this was.       

   IFO has been unlocked all shift. Wind is still high (gusts in the 50s mph) but calming down. Mostly wind is in mid 20s to low 30s. Seismic activity is still high but also settling down. Tried relocking about 30 minutes ago, with no luck. Still cannot move beyond LOCKING_ALS. As conditions improve will continue to try relocking. 

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:

• In the 10-20 Hz region the largest coherence is with DHARD_P (fig 1)
• MICH/SRCL coherence is 4-10 times below the sensitivity at low frequency, so no worrysome yet (unless the coupling is non stationary, to be investigated). Fig. 2 and 3
• PRCL is lower than the other LSC loops (fig. 4)
• The PSL periscope is a win as usual. The largest coherence is in the region 304-368 Hz, but there is a bit of lower coherence in many other bands: 150-155 / 175-185  / 202 / 240-260 / 280-290 / 551-555 / 615-623 Hz (fig. 5)
• I see coherence with OMC-LSC_DITHER_OUT at few frequencies: 80 / 96 / 128 / 288 Hz, not sure what this means
• There is coherence with PEM-EY_MAG_EBAY_SEIRACK at 281.5 Hz and 283.5 Hz.
• Above 500 Hz I can see low coherence with PEM-EY_MAG_EBAY_SUSRACK (fig. 6). This is rather small, but being an environmental channel it might be important to investigate it further.

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

Summary:

We had single-IFO time so I tested the new inverse actuation filter for PCALX. WP5530

Sudarshan and I believe we tracked down the factor of 2 and sign error from the initial PCALX test, see aLog 22160. We wanted to do this test to confirm that.

CBC injections:

The waveform file is: https://daqsvn.ligo-la.caltech.edu/svn/injection/hwinj/Details/Inspiral/H1/coherenttest1from15hz_1126257408.out

The XML parameter file is: https://daqsvn.ligo-la.caltech.edu/svn/injection/hwinj/Details/Inspiral/h1l1coherenttest1from15hz_1126257408.xml.gz

I did three CBC injections. The start times of the injections were: 1128303091.000000000, 1128303224.000000000, and 1128303391.000000000.

The command line to do the injections is:
ezcawrite H1:CAL-INJ_TINJ_TYPE 1
awgstream H1:CAL-PCALX_SWEPT_SINE_EXC 16384 coherenttest1from15hz_1126257408.out 1.0 -d -d >> 20151006_log_pcal.out
awgstream H1:CAL-PCALX_SWEPT_SINE_EXC 16384 coherenttest1from15hz_1126257408.out 1.0 -d -d >> 20151006_log_pcal.out
awgstream H1:CAL-PCALX_SWEPT_SINE_EXC 16384 coherenttest1from15hz_1126257408.out 1.0 -d -d >> 20151006_log_pcal.out

I have attached the log. I had to change the file extension to be posted to the aLog.

DetChar injection:

I injected Jordan's waveform file: https://daqsvn.ligo-la.caltech.edu/svn/injection/hwinj/Details/detchar/detchar_03Oct2015_PCAL.txt

The start time of the injection is: 1128303531.000000000

The command line to do the injections is:
awgstream H1:CAL-PCALX_SWEPT_SINE_EXC 16384 detchar_03Oct2015_PCAL.txt 1.0 -d -d >> 20151006_log_pcal_detchar.out

I have attached the log. I had to change the file extension to be posted to the aLog.