TITLE: 03/13 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 64Mpc
INCOMING OPERATOR: Jeff
SHIFT SUMMARY: Quiet shift
LOG:
Travis had it locked when I arrived, it's still locked as I leave. EY vacuum was alarming all night, otherwise nothing to report. 

CP7 dewar level alarm is due to the level being below 20% -> Accumulated tumbleweeds obstructing the Y-arm access road last Tuesday caused the cancellation of the originally scheduled LN2 delivery.  Rescheduled delivery is for this Tuesday.  No action is required by the CR operator.

TITLE: 03/13 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 68Mpc
INCOMING OPERATOR: Jim
SHIFT SUMMARY:  One lockloss due to PSL trip.  One unknown cause lockloss.  I did have a couple of Tidal X and Y error again tonight during relocking, but they stopped without intervention.  Otherwise a quiet night.  I did get a call from both Chandra and DaveB about CP7 alarms, although I did not receive any alarms in the control room.  Chandra advised to ignore these alarms until Tuesday since the dewar was not filled last Tuesday due to tumbleweed blockage, hence the low level.
LOG:  See previous aLogs.

No issues coming back up. 

Cause unknown.  FOMs look good and environment is quiet.

Begin 1 hour standdown.

No issues coming back up after PSL restart.

PSL tripped. Calling Peter.

TITLE: 03/12 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 67Mpc
OUTGOING OPERATOR: Jeff
CURRENT ENVIRONMENT:
    Wind: 6mph Gusts, 4mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.31 μm/s
QUICK SUMMARY:  No issues handed off.  Looks like a much better start to the night than last night.

Shift Summary: Ran A2L DTT check – Pitch and Yaw are a bit elevated. As LLO is down, dropped out of Observing to run corrective script. A2L script finished with errors. Back to Observing. Spoke with Keita about the A2L Script. See aLOG #34763 for details. Successfully ran the script from a Controls terminal. Pitch and Yaw are now below the reference.

Remained lock for the entire shift. No issues or problems to report.

   A good first half of the shift for data collection. No problems or issues to report. 

   Successfully ran the A2L script from a Controls terminal. Keita is looking into the permissions needed to run the script from the Ops terminal. 

I am on site this morning to inspect the access roads down the arms and found that Y arm is partially blocked, X are is mostly blocked.
 
I am trying to reach the landscapers at the moment to bring them out tomorrow at noon to start baling on the Y arm. This should give them ample time to clear that road by Tuesday morning and allow the required liquid nitrogen delivery.
 
I have informed Keita of this plan. 

   There were errors in the A2L script when I ran it this morning. 

   TJ had reported a problem with the script a couple of weeks ago. I had put it on the Ops white board. As the A2L line had been erased from the Ops white board, and there were no aLOG entries concerning the script, I assumed it had been fixed. 

   After running the script with errors, the A2L is now worse than before the script ran. The low frequency noise is elevated. Range is still over 65 Mpc, so will leave it to the Monday crew.   

   The errors are captured in the two attachments.    

Miriam, Hunter, Andy

A subset of blip glitches appear to be due to a glitch in the ETMY L2 coil driver chain.

We measured the transfer function from the ETMY L2 MASTER channel to the NOISEMON channel (specifically, for the LR quadrant). We used this to subtract the drive signal out of the noisemon, so what remains would be any glitches in the coil drive chain itself (and not just feedback from DARM). The subtraction works very well as seen in plot 1, with the noise floor a factor of 100 below the signal from about 4 to 800 Hz.

We identified some blip glitches from Feb 11 and 12 as well as Mar 6 and 7. Some of the Omega scans of the raw noisemon signals look suspicious, so we performed the subtraction. The noisemons seem to have an analog saturation limit at +/- 22,000 counts, so we looked for cases where the noisemon signal is clearly below this. In some cases, there was nothing seen in the noisemon after subtraction, or what remained was small and seemed like it might be due to a soft saturation or nonlinearity in the noisemon.

However we have identified at least three times where there is a strong residual. These are the second through fourth plots. We now plan to automate this process to look at many more blip and check all test mass L2 coils in all quadrants.