Title: 10/12 Day Shift 15:00-23:00 UTC (8:00-16:00 PST).  All times in UTC.

State of H1: Lock Acquisition

Shift Summary: Locked until 18:12, struggled to relock after that. Sheila and I have been trying different things since. It just lost lock at DC_READOUT as I'm typing this.

Incoming operator: Nutsinee

Activity log:

• 14:19 ETMY sat x2
• 14:55 Bubba bangging on control room
• 15:04 ETMY
• 15:07 ETMY
• 16:15 John, Gerardo to MY for leak checking
• 16:41 Jenne to MY to swap cars
• 16:59 Jenne back
• 16:59 Richard and HFD to MY
• 17:15 Gerardo, John back
• 17:18 Richard and HFD back
• 17:52 Keita and Elli to EY for LV ESD Noise measurement
• 18:04 Gerardo to MY
• 18:12 Lockloss
• 18:20 Blends switched to Quiet_90
• 18:55 Dick to Optics Lab
• 18:56 Blends switched back to 45mHz
• 19:12 Dick back
• 19:25 Gerardo back
• 19:36 Keita back
• 19:53 Starting Initial Alignment
• 20:17 John, Gerardo to MY
• 22:36 John, Gerardo back
• 22:42 Robert driving down Y arm to get equipment in beam tube enclosure between CS and MY

TJ, Sheila, Keita

The LSC loop we use for locking the IR laser to the X arm is not great, (it doesn't have much gain margin which causes problems locking with different alignments.)

Nutsinee, Travis, and TJ have all run into trouble with the input aling step of initial alingment, where they could keep the arm locked on IR but the WFS would misalign the beam.  Today we looked at the signals, saw that they were oscillating at around 126 Hz for alignments that increased the transmitted power.  This was because the length loop was oscillating.  We were able to temporarily fix this by reducing the gain in the loop from 0.1 to 0.05.  We should take some time to reshape this loop.  

Sheila, Jeff K, TJ

With the microseism still high and the winds not increasing, we decided to keep the 45mHz blends. We couldn't make it past DARM_WFS so we decided on an initial alignment, but now we can't even make it past the first step here. Sheila is working her magic so hopefully the next update will be more optimistic.

Here are the observed H1-L1 coherences as of October 12, 2015, as calculated by stochmon:
https://ldas-jobs.ligo.caltech.edu/~thomas.callister/stochmonO1/stochmon.html

Some plots attached.

100 mHz resolution. 1E-5 is the expected level of coherence due to uncorrelated noise.
Frequency, coherence
33.6 Hz, 1E-3
34.6 Hz, 2E-2
35.4 Hz, 1E-3
42.5 Hz, 6E-4 (barely above background, could be a noise fluctuation)
64.0 Hz, 2E-4 (barely above background, could be a noise fluctuation)
74.0 Hz, 5E-4 (barely above background, could be a noise fluctuation)
128.0 Hz, 1E-2
256.0 Hz, 2E-3
331.8 Hz, 3E-4 (barely above background, could be a noise fluctuation)
351.1 Hz, 4E-4 (barely above background, could be a noise fluctuation)
559.9 Hz, 2E-4 (barely above background, could be a noise fluctuation)
736.0 Hz, 3E-3 (23rd harmonic of 32 Hz)
1904.0 Hz, 2E-3 (119th harmonic of 16 Hz)
2160.0 Hz, 4E-4 (135th harmonnic of 16 Hz)
2376.0 Hz, 4E-3 (297th harmonic of 8 Hz)
2768.0 Hz, 7E-3 (173rd harmonic of 16 Hz)
2984.0 Hz, 7E-4 (373rd harmonic of 8 Hz)
3001.2 Hz, 1E-1 (calibration lines)
4928.0 Hz, 3E-3 (77th harmonic of 64 Hz)
5016.0 Hz, 3E-3 (627th harmonic of 8 Hz)
5144.0 Hz, 2E-1 (largest coherence, 643rd harmonic of 8 Hz)
5616.0 Hz, 2E-3 (351st harmonic of 16 Hz)
5624.1 Hz, 6E-3 


0.25 Hz, 4E-6 is the expected level of coherence due to uncorrelated noise.
Frequency, coherence
34.25 to 35.25 Hz, 1E-3
36 to 37 Hz, 1.5E-3
37.25 Hz, 2E-3
42.5 Hz, 2E-4
128.0 Hz, 3E-3
256 Hz, 6E-4
1904.0 Hz, 4E-4 (119th harmonic of 16 Hz)
3552.25 Hz, 2E-4
4163.75 Hz, 5E-3 Hz
4576.0 Hz, 2E-4 (143rd harmonic of 32 Hz)
5016.0 Hz, 7E-4 (627th harmonic of 8 Hz)
5144.0 Hz, 1E-1 (largest coherence, 643rd harmonic of 8 Hz)
5584.5 Hz, 2E-2
5655.5 Hz, 1E-3

J. Kissel, T. Schaffer, S. Dwyer

After loosing lock, "the plan" had been to switch back to 90 [mHz] blend fliters, after having switched to 45 [mHz] over the weekend (see LHO aLOG 22410). After loosing lock at 18:12 UTC, by ~18:30 UTC we had BSC platforms switched to 90 [mHz] blends. Sheila commented that motion is still too large, so we switched back to 45 [mHz] blends by 19:00 UTC, and we're resuming lock acquisition. We'll see how it goes -- the wind is on its way up...

I attach some relevant screenshots of the amplitude of motion over the past 12 hours.

Summary:

Last night I performed a number of hardware injections see aLog 22424 and aLog 22426.

Waveforms:

The waveforms were provided by Max and Francesco on behalf of the Burst group.

The single-column ASCII files are located in the injection SVN: https://daqsvn.ligo-la.caltech.edu/svn/injection/hwinj/Details/Inspiral/${IFO}/ringburstinj*.out

The parameters files are located: https://daqsvn.ligo-la.caltech.edu/svn/injection/hwinj/Details/Inspiral/ringburstinj*.xml.gz

First Set of Injections:

Originally the plan was to space the injections 180s apart.

I used tinj to schedule the injections so they are all H1L1 coherent injections.

The following injections were successful:
1128657857 1 1.0 ringburstinj1a_1126259456_
1128658217 1 1.0 ringburstinj2a_1126259456_
1128658577 1 1.0 ringburstinj3a_1126259456_
1128658937 1 1.0 ringburstinj4a_1126259456_
1128659297 1 1.0 ringburstinj5a_1126259456_

Note that the GPS time above (first column) is the time the injection began. The end times are ~6s after this time. The exact end time can be calculated from the parameter files.

Also recall from aLog 21487 that all analysis should have a 255us advance.

The following injections were skipped, ie. not injected, because tinj couldn't inject signals every 180s. The following were skipped injections and thus not successful:
1128658037 1 1.0 ringburstinj1b_1126259456_
1128658397 1 1.0 ringburstinj2b_1126259456_
1128658757 1 1.0 ringburstinj3b_1126259456_
1128659117 1 1.0 ringburstinj4b_1126259456_
1128659477 1 1.0 ringburstinj5b_1126259456_

We then had an external alert during the test. The injection in the queue was canceled at H1 but the injection was not canceled at L1. Duncan, Peter, Alex are investigating why this happened. The following injection was not performed at H1 but it was performed successfully at L1:
1128659657 1 1.0 ringburstinj6a_1126259456_

I then deleted the future injections from the schedule since it did not seem like L1 properly ignored the last injection. See aLog 22425 for the lines that were deleted.

Second Set of Injections:

We continued the hardware injections later in the night after waiting so the external alert had a stretch of clean data. The injections were spaced 360s apart this time and there was no problem with tinj handling injections this frequent.

The following injections were successful:
1128666017 1 1.0 ringburstinj1b_1126259456_
1128666377 1 1.0 ringburstinj2b_1126259456_
1128666737 1 1.0 ringburstinj3b_1126259456_
1128667097 1 1.0 ringburstinj4b_1126259456_
1128667457 1 1.0 ringburstinj5b_1126259456_
1128667817 1 1.0 ringburstinj6a_1126259456_
1128668177 1 1.0 ringburstinj6b_1126259456_
1128668537 1 1.0 ringburstinj7b_1126259456_
1128668897 1 1.0 ringburstinj8a_1126259456_
1128669257 1 1.0 ringburstinj7a_1126259456_
1128669617 1 1.0 ringburstinj8b_1126259456_
1128669977 1 1.0 ringburstinj9a_1126259456_
1128670337 1 1.0 ringburstinj10a_1126259456_
1128670697 1 1.0 ringburstinj11a_1126259456_
1128671057 1 1.0 ringburstinj12a_1126259456_
1128671417 1 1.0 ringburstinj13a_1126259456_
1128671777 1 1.0 ringburstinj14a_1126259456_
1128672497 1 1.0 ringburstinj15a_1126259456_

We just lost lock at 18:12 UTC

Gerardo noticed a few semis driving along route 10, this is uncommon for this time of day.

There is also construction on route 10 about .5 miles north of the site entrance. Not sure what exactly they are doing but there are rumors that they are just filling cracks in the road.

LHO's second-Saturday public tour occurred on the afternoon of 10/10.  Arrival time at LSB = 1:00 - 1:30 PM.  Departure time = 3:30 PM.  Group size = ~30 adults.  Vehicles at the LSB = ~15 passenger cars.  The group was on the overpass near 2:50 PM and in the control room from about 3:10 to 3:30.  Site winds picked up substantially near 2:30 PM. 

10-12-15 Morning Meeting Minutes

·      SEI – Running 45mHz blends are running on the BSC ISIs, may need to change them soon.

·      SUS - Needs charge measurement tomorrow.

·      ISC – Needs noise measurement of LV esd

·      Vac – Leak testing, no N2 deliveries this week.

·      Fac – Work with the water tank, starting again on the crack sealing on beam tube sealing during Observing.

·      PEM – Completed tamper inj at CS, but still needs ends. Needs about a two hours for both end stations.

·      Maintenance items:

o   ESD measurement - Keita

o   Slow controls testing DAQ – JH

o   PCal calibrations X/Y ends (Needs ETMs aligned) – Pcal team

o   Copy HW Inj Infrastructure to PCalX – Jeff K

o   Return HEPI pump pressure sensors to norm – Hugh

o   PEM inj, possible gluing to mirror in PSL – Robert

o   Finish deinstallation of old roof cam - Richard

o   PEM temp sensors on chambers – Richard

o   Fire dept. maintenance on hydrants

o   Plumbing in the LVEA – Jeff B.

o   Phone identification signs in ends/mids – Bubba

o   Jim wants to take some transfer functions on HAM BSC (probably not yet)

o   Load from MY to staging building – Jodi

o   Pulling cables from ends to 250 mark for ion pumps – CDS

o   Sataboy, storage data for DMT, work - Carlos

• Title: 10/12 DAY Shift: 15:00-23:00UTC (8:00-16:00PDT), all times posted in UTC
  

• State of H1: Observing
  

• Outgoing Operator: Cheryl
  

• Quick Summary: She seemed to have a good shift, stayed locked with calm winds and no earthquakes. Microseism picked up again 8 hours ago. Blends are still in the 45mHz for all BSC ISIs

Title:  10/12/2015, Owl Shift 07:00 – 15:00UTC (00:00 – 08:00PT)

State of H1: Locked in NOMINAL_LOW_NOISE at 76.6Mpc. 

Outgoing Operator: JeffB

Quick Summary: 

Chris Biwer doing hardware injections - ending around 8:10UTC (see his alog)

Instructions to switch ISI Blend Filters after lock loss, and try the Quiet 90 filters on BSC chambers.

Finished with hardware injection tests. More details later.

Activity Log: All Times in UTC (PT)

23:00 (16:00) Take over from TJ
02:30 (19:30) Jeff K. left the site
03:57 (20:57) Chris – Running hardware injections for the next 72 minutes. 
			Approved by Mike L., Notified LLO, Will not drop out of Observing
04:30 (21:30) GRB Alert – In one hour stand down
04:58 (21:58) ETMY saturation event during GRB stand down
05:30 (22:30) Finished one hour stand down. 
06:15 (23:15) Chris – Restarted hardware injections
07:20 (00:20) Turn over to Cheryl
	

Title: 10/11/2015, Evening Shift 23:00 – 07:00 (16:00 – 00:00) All times in UTC (PT)

Support: Jeff K, 

Incoming Operator: Cheryl

Shift Summary: 
- 03:57 – Chris running hardware injections. He has Mike’s approval and did not go out of Observing
- 04:30 Received GRB alert. Both sites in Observing mode. In stand down for 1 hour
Chris has stopped the hardware injections he was running.  Per Verbal Alarm - Last injection stopped at 04:28:17, the GRB was time stamped at 04:30:28.  
 	
Good shift. IFO locked in Observing for 14 hours. Low wind and seismic. There were several ETMY saturations. There were 3 mag 5 or greater earthquakes during the shift, but these did not noticeably affect the IFO.      

We're going to continue with the hardware injection tests again after waiting for the external trigger.

The schedule will be updated with the following lines:
1128666017 1 1.0 ringburstinj1b_1126259456_
1128666377 1 1.0 ringburstinj2b_1126259456_
1128666737 1 1.0 ringburstinj3b_1126259456_
1128667097 1 1.0 ringburstinj4b_1126259456_
1128667457 1 1.0 ringburstinj5b_1126259456_
1128667817 1 1.0 ringburstinj6a_1126259456_
1128668177 1 1.0 ringburstinj6b_1126259456_
1128668537 1 1.0 ringburstinj7b_1126259456_
1128668897 1 1.0 ringburstinj8a_1126259456_
1128669257 1 1.0 ringburstinj7a_1126259456_
1128669617 1 1.0 ringburstinj8b_1126259456_
1128669977 1 1.0 ringburstinj9a_1126259456_
1128670337 1 1.0 ringburstinj10a_1126259456_
1128670697 1 1.0 ringburstinj11a_1126259456_
1128671057 1 1.0 ringburstinj12a_1126259456_
1128671417 1 1.0 ringburstinj13a_1126259456_
1128671777 1 1.0 ringburstinj14a_1126259456_
1128672497 1 1.0 ringburstinj15a_1126259456_

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.    

Elli and Stefan showed in aLOG 20827 that the signals measured by AS 36 WFS for SRM and BS alignment appeared to be strongly dependent on the power circulating in the interferometer. This was apparently not seen to be the case in L1. As a result, I've been looking at the AS 36 sensing with a Finesse model (L1300231), to see if this variability is reproducible in simulation, and also to see what other IFO variables can affect this variability. 

In the past when looking for differences between L1 and H1 length sensing (for the SRC in particular), the mode matching of the SRC has come up as a likely candidate. This is mainly because of the relatively large uncertainties in the SR3 mirror RoC combined with the strong dependence of the SRC mode on the SR3 RoC. I thought this would therefore be a good place to start when looking at the alignment sensors at the AS port. I don't expect the SR3 RoC to be very dependent on IFO power, but having a larger SR3 RoC offset (or one in a particular direction) may increase the dependence of the AS WFS signals on the ITM thermal lenses (which are the main IFO variables we typically expect to change with IFO power). This might therefore explain why H1 sees a bigger change in the ASC signals than L1 as the IFOs heat up. 

My first step was to observe the change in AS 36 WFS signals as a function of SR3 RoC. The results for the two DOFs shown in aLOG 20827 (MICH = BS, SRC2 = SRM) are shown in the attached plots. I did not spend much time adjusting Gouy phases or demod phases at the WFS in order to match the experiment, but I did make sure that the Gouy phase difference between WFSA and WFSB was 90deg at the nominal SR3 RoC. In the attached plots we can see that the AS 36 WFS signals are definitely changing with SR3 RoC, in some cases even changing sign (e.g. SRM Yaw to ASA36I/Q and SRM Pitch to ASA36I/Q). It's difficult at this stage to compare very closely with the experimental data shown in aLOG 20827, but at least we can say that from model it's not unexpected that these ASC sensing matrix elements are changing with some IFO mode mismatches. The same plots are available for all alignment DOFs, but that's 22 in total so I'm sparing you all the ones which weren't measured during IFO warm up. 

The next step will be to look at the dependence of the same ASC matrix elements on common ITM thermal lens values, for a few different SR3 RoC offsets. This is where we might be able to see something that explains the difference between L1 and H1 in this respect. (Of course, there may be other effects which contribute here, such as differential ITM lensing, spot position offsets on the WFS, drifting of uncontrolled DOFs when the IFO heats up... but we have to start somewhere).