Arrival:

• Taking over from Patrick. IFO locked in NOMINAL_LOW_NOISE-68.82MPC. Slight downward trend in range over the past 8 hours possibly due to slight upward trend in microseism. Wind and earthquake activity seem quiet. Lights are off everywhere that I can see on cameras. Landscapers are on site cleaning weeds. IP-9 A&B both reading 7KV/6.2e-09 and 1.8e-08 respectively. The rest of the vacuum system looks good. All other systems are GO. Steady as she goes.

~13:00 - 13:09 UTC Stepped out of control room.
14:49 UTC dust monitor invalid alarm at end X

Remainder of shift quiet. Range seems to be slightly dropping with slow increase in microseism.

Handing off the Ed.

07:12 UTC Handoff from Nutsinee. H1 in observing mode at around 70 Mpc. Kiwamu only other person here.
07:16 UTC Lights are off in the LVEA and PSL enclosure. Lights appear to be off at the mid and end stations.
07:17 UTC Checked IP9. Both A and B pumps HV around 7kV.
07:53 UTC Momentary end X HEPI pump station pressure minor alarm.
08:52 - 08:58 UTC Stepped out of control room.
09:06 UTC Kiwamu leaving site. I'm alone.
10:50 - 10:57 UTC Stepped out of control room.

No lock losses or changes in observing mode. SUS ETMY saturations at 08:44:54 and 11:00:19 UTC.

I worked a bit more on the analysis codes that Jeff has written (alog 21015 and alog 21049). I was not able to finish deriving the suspension scale factors. Tomorrow, Jeff and Darkhan will pick up them at the point where I left and will continue working on it.

Major updates:

• DARMOLGTFmodel now incorporates not only each ESD driver circuit measurement but also each PUM coil driver measurement.
  • Darkhan is going to alog some detail of the PUM driver measurement and fitting.
• The ALS Diff measurements are now analyzed using the latest DARMOLGTF model.
• Also, the Pcal measurements are now analyzed using the latest DARMOLGTF model.
  • By eyeballing the resultant plots, I see that the inclusion of the ESD driver and PUM coil driver circuits made the model more accurate. This is encouraging.

Next steps:

• We need to include the latest DARMOLGTF model in the free-swinging Michelson analysis.
• UIM driver circuit needs to be updated. DARMOLGTF still assumes a perfect cancelation between the digital and analog filters.

Some notes:

In the course of the code update, I changed the file organization structure of the ALS diff and Pcal scripts so that they have only one analysis code which can be invoked by specifying a set of data parameters. This organization approach is the same as those for the DARM open loop analysis.

As for ALS diff, the core analysis code is

aligocalibration/trunk/Runs/ER8/H1/Scripts/ALSDiff/Matlab/analyze_alsdiff.m

and the parameter files are in the same directory and named as

H1ALSDIFFparams_20150826.m

H1ALSDIFFparams_20150828.m

H1ALSDIFFparams_20150829.m

As for Pcal, the core analysis code is

aligocalibration/trunk/Runs/ER8/H1/Scripts/PCAL/analyze_pcal.m

and the parameter files are in the same directory and named as

H1PCALparams_20150826.m

H1PCALparams_20150828.m

H1PCALparams_20150829.m

Each parameter file loads H1DARMOLGTFmodel_ER8 with the latest electronics information and subsequently returns the parameter structure, or the familiar variable "par". As usual the parameter structure can be then fed to the analysis code (e.g. analyze_alsdiff.m or analyze_pcal.m) as an input argument. I have not carefully thought about the final return variables from the core analysis codes, but in principle we can write them such that they return the calibrated suspension transfer functions in meters/counts together with some error bars and also perhaps some statistical values. In this way, the final step of performing apple-to-apple comparison between various measurements from various dates can be less painful.

I tried propagating the same file organization structure to the free-swinging Michelson codes, but apparently I am running out my energy for the night and did not finish it yet.

(All time in UTC)

23:00 The interferometer is down. Take over from Ed.

23:51 Dick to optics lab

23:56 IMC had trouble locking. MC2 pitch seems to have moved the most from the time the ifo was still locking so I touched it and managed to get IMC locking again. Ed had to touch ITMY to get the green to lock, fearing that this might give me trouble during DRMI afterward I reverted his changes and tried adjusting ETMY and gave TMSY a small touch.

00:36 Wind reached 40 mph. I adjusted PR3 to maximize COMM beatnote. Can't really do much at this point. Waiting until the wind calm down.

01:20 Dick to LVEA.

01:38 Dick back

01:51 Robert to LVEA

01:55 Robert back

02:11 After trouble locking DRMI AND PRMI, I decided to do initial alignment. I didn't see that Patrick already did this last night.

03:24 After the inital alignment locking DRMI still seems hopeless. Locking PRMI.

03:48 PRMI also have difficulty locking. I adjusted BS, PRM, PR2. Adjusting PR2 seems to be the most effective. Maybe adjusting BS and PRM wasn't necessary...

04:20 PRMI is good but I still can't get the DRMI to lock.  I've been adjusting SRM pitch and yaw but no luck. Not sure what on earth is going on. POP18 and POP90 is flashing high so I know the PRMI is good.

04:25 I noticed that SR3_CAGE_SERVO wasn't engaged. I think it HASN'T been engaged this whole time that I was having problem with DRMI. It saw SR3 misaligned at some point and never turned itself back on. SR3_CAGE_SERVO supposed to correct SR3 misalignment due to interferometer heating/cooling. Otherwise locking DRMI will be a problem. So, note to self, MAKE SURE THE CAGE_SERVO IS ON!!!

04:29 ISC_DRMI Connection Error. I called Jenne and it was an easy fix. Just request STOP, and EXEC again at ISC_DRMI. DRMI is now locking again (thank goodness).

04:47 Locked at NOMINAL_LOW_NOISE. Back to Observing. 71 Mpc (hooray!).

05:00 Kiwamu arrived doing calibration work.

07:00 Wind below 20 mph. The saturation alarm hasn't been complaining much. Handing off to Patrick.

Note:

- I checked and the SR3_CAGE_SERVO wasn't turned off until I started the initial alignment. Whatever was giving me hell with DRMI and PRMI earlier wasn't the cage servo. But to be fair I didn't touch any optics in trying to fix PRMI before I went and did the initial alignment (PRMI never had trouble locking itself in my experience!). I guess I should have...

- I have been getting calls from an unknown number all day and nobody talks when I answered. The last call was just a few minutes ago. It's really annoying....

04:47 UTC at 71 Mpc.

ER8 Day 19, no restarts reported

After I got the IMC back up (it had trouble locking itself so I touched MC2 pitch a little), the wind picked up speed. It has just reached 40 mph and the forecast says it should come down in 3 hours or so. I'm waiting for the wind to calm down before moving on. Hopefully I don't have to wait 3 hours...

Kiwamu, Sheila, Evan

Durring the calibration activities last week Kiwamu noticed that there was upconversion of the drive from ETMY.  Specifically when he drove in the L3 LOCK filter, he saw a second harmonic. When he drove each stage individually, through the test filter bank with a similar amplitide he saw no evidence for upconversion.  This suggests that the upconversion might come about by driving mutliple stages, or through the length 2 angle paths. 

We went back through the data and looked at the relative heights of the peaks.  We also calculated a ratio of the amplitude of the second harmonic to the square of the amplitude at the fundamental :
  ASD(2f) = alpha * (ASD(1f))^2

If we ignore other frequencies which could mix and only consider the second harmonics of DARM control, we would expect this upconversion to be something like a factor of 10 below our measured noise at 20 Hz, and near the measured noise at 10 Hz.

The next step is probably to identify which stages contribute to this upconversion, for example it seems probable that this is only noticeable for frequencies where L2 get a significant fraction of the DARM control signal. 

Summary:

• Shift was mostly quiet. Some glitching. Wind starting picking up ~ 3 hours ago gusting to around 35mph. Recovery after Lockloss is proving to be a bit of a chore. Mode Cleaner is unlocked and trying to relock but the curious thing is while the REFL shows it trying to lock in flashes the TRANS isn’t showing sympathetic flashing. hmm. Handing off to Nutsinee.

ACTIVITY LOG:

• 16:21  a glitch occurred between 50Hz and 300Hz

• 16:25 Robert on site. He suggests that high frequency noise in an oscillator is causing the lack of normal range.

• 16:58 ETMY glitch

• 17:30 EX Pump differential pressure alarm going off.(yellow)

• 17:41 ETMY saturating for ~ 1 minute repeatedly.

• 17:42 OMC DCPD saturated a couple of times. WE SURVIVED THE GLITCHES.

• 17:43 Noticed the landscapers are here for tumbleweed/weed control. (as scheduled)

• 18:00 Landscapers moved their truck from the LSB to the OSB

• 18:03 LLO in Observing mode

• 18:15 Kiwamu on site

• 22:03  Lockloss

• 22:13 Locking ALS giving a bit of trouble in the X dept.

• 23:00  Still trying to get arms locked and setlled. Handing off to Nutsinee

LOCK LOG:

• 22:03 Lock Loss - PRM saturating

  • Strange thing is, Guardian tried to go straight to LOCK_DRMI_1F?? It then proceeded to LOCKLOSS and then DOWN. It then proceeded normally.

22:03UTC LockLoss after PRM saturation. Wind has increased gusting to ~30 at times. Not sure what caused the break. Trying to re-align ALS.

ALL TIMES IN UTC

Arrival:

• 15:00 Taking over from Patrick. IFO is locked at 60Mpc. Why the lower range is unknown to me. Perhaps it is due to work that occurred during the night? Perhaps the ground hasn’t completely settled from the last earthquake?  Wind ≤ 15mph. There has been destructive seismic activity eminating from a volcanic area in the Aleutian chain for the past 8.5 hours. No one else on site, yet. Livingston has been down for the past 8 hours.

Mid-Shift Summary:

• IFO locked. Range is ~60Mpc probably due to HF noise in DARM. According to Kiwamu, this could also be a difference in calibration that we experience from lock to lock. I spoke with WIlliam Parker and Tom Evans at Livingston and they reported their trouble locking https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=20285. LLO back up at ~17:50UTC. Robert Schofield has been on site since 16:25UTC. Also, at ~17:43UTC I noticed the landscapers clearing tumbleweed and debris in the gravel in front of the LSB. LLO set their Intent Bit at 18:03UTC. Seismic activity has settled back to reasonably nominal levels and the wind speeds remain unobtrusive.

11:28 UTC Dan left. All alone.
13:08 UTC Checked IP 9. Both A and B Pumps high voltage near 7 kV.
13:44 UTC Lost lock, earthquake 4.5 154km S of Atka, Alaska 2015-09-05 13:04:34 UTC39.0 km deep
14:16 UTC Restarted alarm script on video5: line 139 in lock_end science = seconds_to_hms(sum(science_segs)) NameError: global name 'seconds_to_hms' is not defined
14:40 UTC Back to observing mode, range is down around 60 Mpc. Is this left over from earlier problem Dan ran into?

In observing mode around 60 Mpc. Handing off to Ed.

Dan, Evan

This evening we made a qualitative study of the coupling of beam jitter before the IMC into DARM.  This is going to need more attention, but it looks like the quiescent noise level may be as high as 10% of the DARM noise floor around 200Hz.  While we don't yet understand the coupling mechanism, this might explain some of the excess noise between 100-200Hz in the latest noise budget.

We drove IMC-PZT with white noise in pitch, and then yaw.  The amplitude was chosen to raise the broadband noise measured by IMC-WFS_A_I_{PIT,YAW} to approximately 10x the quiescent noise floor.  This isn't a pure out-of-loop sensor, and since we were driving the control point of the DOF3 and DOF5 loops of the IMC alignment channels we will need to work out the loop suppression to get an idea of how much input beam motion was being generated.  Unfortunately we don't have a true out-of-loop sensor of alignment before the IMC.  We may try this test again with the loops off, or the gain reduced, or calibrate the motion using the IMC WFS dc channels with the IMC unlocked.  Recall that Keita has commissioned the DOF5 YAW loop to suppress the intensity noise around 300Hz.

The two attached plots show the coherence between the excitation channel (PIT or YAW) and various interferometer channels.  The coupling from YAW is much worse: at 200Hz, an excitation 10x larger than normal noise (we think) generates coherence around 0.6, so the quiescent level could generate a few percent of the DARM noise.  Looking at these plots has us pretty stumped.  How does input beam jitter couple into DARM?  If it's jitter --> intensity noise, why isn't it coherent with something like REFL_A_LF or POP_A_LF (not shown, but zero)? 

The third plot is a comparison of various channels with the excitation on (red) and off (blue).  Note the DCPD sum in the upper right corner.  Will have to think more about this after getting some slpee.

Took over from Nutsinee. Dan, Kiwamu and Darkhan also here.

07:15 UTC Lock loss. SUS OMC SW WD tripped. Possible earthquake.
07:21 UTC Touched up SUS ETMX pitch for locking on green. X arm green power remaining around .8
07:26 UTC Requested INIT, DOWN then NOMINAL_LOW_NOISE. Did not help.
07:39 UTC Dan suggested adjusting TMS alignment. This brought the X arm green power over 1. Guardian moved on.
07:44 UTC Reloaded TJ's script on video5 per his earlier request.
DRMI alignment looks bad, misaligned SRM to lock on PRMI, did not help
07:50 UTC Started initial alignment per Dan's suggestion
08:35 UTC Darkhan left. Kiwamu and Dan still here.
08:38 UTC Got to and stopped at DC_READOUT_TRANSITION. Dan modifying guardian to run measurement on OMC.
08:48 UTC Kiwamu left. Just Dan and I here.
08:57 UTC Checked that the PSL cameras are not frozen. Lights are off in the PSL enclosure. Checked mid and end station cameras. All dark, but end X does not move. mid Y still has flickering green lines. Lights are on in the LVEA.
09:03 UTC Dan starting measurement.
09:58 UTC Dan stopping measurement. Investigating possible issues with calibration left over from measurement.
10:52 UTC Observing mode.

More ETMY saturations.