Workstations were updated and rebooted.  This was an OS package update.  Conda packages were not updated.

TITLE: 06/04 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 136Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY: The wind has calmed down enough for us to relock finally, microseism is rising. The range is a little lower than usual, SQZing doesn't look amazing.

00:10 & 00:12 UTC ITMY ST2 wd trip from sei testing

00:18 UTC HEPI HAM1 trip potentially from Robert dropping a viewport cover by HAM3

Viewports are all covered, and we are ready to return to LASER SAFE tomorrow alog78225

Lots of EX saturations during CARM_OFFSET_REDUCTION

I had to hold in OMC_WHITENING to damp violins for 20 minutes

03: 09 UTC back to Observing

03:48 UTC lockloss

05:19UTC back to Observing

LOG:                                                

https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1401508133

Wind was brutal today, so I was messing with the controls on the BSCs to try to help. Mostly just running RX/RY sensor correction from St1 to St2 on the BSCs. Sensor correction is focused on improving the ~.4hz motion and doesn't really affect the motion outside that. I don't think this really helped, winds calmed down after I left at 5:30 and Ryan is almost all the way NLN now, so I will leave the extra sensor correction running for tonight. I'll accept SDFs for tonight, then turn it back of during maintenance tomorrow.

Wind and lock losses make a comparison challenging, but the blrms trends show the (log scale) improvement ETMY sees when it's turned on over .3-1hz. Top trace is the St2 RX GS13 blrms, middle trace is the gain for the sensor correction, sc is on when it's 1, off at 0. Bottom trace are the .3-1hz ground blrms. For the las 3-ish hours the St2 RX motion is lower with the sensor correction on even when the ground is moving more in this frequency band.

I replaced the temporary covers on all viewports that I have opened with permanent covers.

TITLE: 06/03 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Wind
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: Still working on relocking and at LOCKING_ALS. We recently had gotten up to CARM_OFFSET_REDUCTION.
LOG:

14:30 Detector Observing and Locked for 6 hours

15:27 Lockloss https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78202
    - PSL ISS diffracted power low, so I moved REFSIGNAL up by 0.01
    - Having issues locking ALS because of the wind picking up
    - 10 locklosses from LOCKING_ALS
    - 1 lockloss from FIND_IR
16:18 Holding in DOWN for a bit
16:28 Starting to relock again
    - 3 locklosses from ALS
16:35 Back to DOWN - going to have to sit here for a while
    - Some maintenance tasks are going to be done
17:59 Trying relocking again again
    - Lockloss from CARM_150_PICOMETERS
    - Lockloss from POWER_10W
    - (many) locklosses from LOCKING_ALS
    - Lockloss from CARM_150_PICOMETERS
20:21 Put in DOWN
21:49 Retrying relocking
    - Lockloss from CARM_OFFSET_REDUCTION                                                                         

Captured spectra for ranges at 140Mpc to 155Mpc, as well as the spectra after SR3 aligment changed to 83 from 438.

Reference point are labeled. The file is saved at /ligo/home/karmeng.kwan/DARM_trace.xml

DARM spectra was captured from H1:CAL-DELTAL_EXTERNAL_DQ

Jennie W, Sheila

Jeff reminded me that we should notch out the bounce mode from the ASC MICH loops wich also feedback to the beamsplitter if we are correcting its notch in the LSC loops as per this entry.

The filter module I used was FM9 in ASC-MICH_P and Y. This is the orginal contents for MICH_P and this is it for MICH_Y. I checked the guardian code and neither of these were used in ISC_DRMI or ISC_LOCK guradians currently.

I copied the filter design from the LSC loop but without the roll mode notch at 25Hz as this was not in the ASC MICH loop already and we might want to tune this later if we can see it in DARM.

I tuned the magnitude to make it 0dB at high and low frequency. The filter design is here and the plot is here for pitch. And the same filter design and plot for yaw.

I don't have an OLG measurement to verify this mode shows up in ASC-MICH but Sheila pointed out that the ASC MICH loops are lower bandwidth than the LSC MICH loops so we shouldn't lose too much phase margin with this filter.

These new filters are saved and loaded in the ASC model coefficients but we will not test them till our next commissioning period.

I dove a bit further into the H1:TCS-ITMX_CO2_ISS_CTRL2_OUT_DQ channel correlating with our range drops on some days in May (alog78089). Robert and I also went onto the TCSX table and confirmed that the AOM is unplugged and that there were no other obvious culprits there on table. I added a 50 Ohm BNC terminator to the AOM as an excissive precaution and also moved some of the disconnected BNC cables on top of other cables to keep them from contacting the table directly. We also got Fil and had him look in the CER at the related chassis just in case.

Shown in the attached screen shot, the channel in question is ahead of an open switch (#1 & #2 are the CTRL2 outputs shown in medm and the electronics drawing - D1300015). #3&4 are the switch and #5&6 are the CTRL1 which doesn't see this same noise that CTRL2 sees during the range drops. The source of the extra noise must somehow be introduced somewhere from the open switch to the CTRL2 channel. In epics, I only see it in the CTRL2 channel. Interstingly, on May 17 the TCSX laser lost lock and the CTRL2 channel had an odd glitch 4 seonds before (2nd attachment).

Talking with Fil we might try disconnecting some of this at the AA chassis or swapping with TCSY to see if the problem moves with the chassis. In favor of not losing the one channel we have that connects some of our range loss, we might try swapping the chassis first.

TITLE: 06/03 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Wind
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 29mph Gusts, 21mph 5min avg
    Primary useism: 0.06 μm/s
    Secondary useism: 0.21 μm/s 
QUICK SUMMARY:

• High winds have made relocking a struggle, we haven't been able to make it past 5W in POWER_10W
  • The wind is forecasted to calm down around 05:00 - 06:00  UTC, 10 - 11 pm local  
• 0.03 - 0.1 & 0-1 - 0.3 are both elevated

With the difficulties locking, I tried changing some of the CPS diff filters to get the end station ISI to follow the corner ISI. The CPS diff uses a band pass filter to reduce the differential motion between the ISI, but this filter can inject motion at the microseism. Microseism is low, I'm guessing the arms are struggling more with the below .1hz motion. In the attached image the filters we had been using, are the red trace, blue is what I switched to. It kind of seemed to help, but I think we lost lock after I left the room. I'll leave this running for now, going to try a couple other things.

Sheila, Jennie W

Sheila and Annamaria realised we have a noise bump around 17.75 Hz and hypothesised it could be the bounce mode of the beamsplitter which we have not retuned since adding the BRD (bounce-roll mode dampers) on the beamsplitter.

The LSC-MICH loop feeds back to the beamsplitter.

The measurement of the MICH loop is shown in this plot where it has a UGP 5.87Hz and phase margin of 35.5 degrees.

Code was adapted from Sheila's in this alog and is saved in /ligo/home/jennifer.wright/Documents/Filter_Design/plot_noise_OLG.py - although we are not sure if uncertainty estimates are accurate and the measurement is low coherence below 6Hz (near the UGP).

Sheila looked through the guardian and realised that we don't use FM8 in locking so we will overwrite the 15Hz notch here. Therte is an existing BRD bandpass in FM10 with this shape, which is used in locking, we don't want to overwrite this at the moment but we might once we test the new filter.

I copied over the FM10 filter to FM8 and then made it a bit wider to match the width of the bounce mode in the DARM spectrum found in this measurement from the 8th May.

The new filter is here and has this shape. We made it always on with a ramp of 4s and it is called BR0604.

I reloaded the LSC model coefficients (twice because I forgot to change the filter name the first time).

We will not test it till our next commissioning period.

Wind is above 40mph and we are trying to relock. We were able to make it up to POWER_10W a bit ago but then lost lock.

R. Short, J. Oberling

While H1 was down this morning from wind, we took the opportunity to touch up PMC alignment and recalibrate the rotation stage. With the ISS off, we used the two picomotor-controlled mirrors to increase PMC TRANS from 106.0W to 106.2W and decrease PMC REFL from 21.4W to 20.9W. Not much of an improvement here, unfortunately, so we think this lines up with our theory of increased loss in the PMC cavity (discussed in alog78093). We're now starting to think about swapping the PMC with our fresh spare during a future maintenance period, especially if we see this loss getting worse, but no plan is currently set for that just yet.

After turning the ISS back on, I proceeded to recalibrate the rotation stage since the output from the PMC has changed a couple of times in the past week with our alignment changes. Calibration curve, SDF screenshot accepting new values, and text file from the process are attached.

https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1401411781

Andrei, Sheila

We've analyzed the time-traces of the effective range (H1:CDS-SENSMON_CAL_SNSW_EFFECTIVE_RANGE_MPC) along with the alignment channels FC_WFC_A(B) and AS_A(B)_RF42 (see attached figures). We found no observable dependance between those.

Minhyo

Tried move the beam on OMC QPD using single bounce beam (ITMX misaligned). Changed OM3 PIT & YAW from 18:04:45 UTC (gps: 1398534729).
- Tried same task with OM3, with turning off ASC centering, OMC centering, started new from 18:21:00 UTC (gps: 1398536470).
 

After finishing with OMC QPD, reverted all settings with OM3 and then moved to OM2.
- Moved OM2 PIT&YAW to check ASC-AS_A & B. Finished at 18:35:00 UTC (gps: 1398537318)

Same job was done (moving OM3 -> OM2) with SQZ beam on OMC (from 20:12:05 UTC to 20:24:00 UTC, gps:1398543158-1398543858)

Screenshots (ndscope) are: 1) Measurement with single bounce beam, 2) Measurement with SQZ beam