Everything looks fine here.

   Per Keita:

  Spoke with Brian O’Rielly. LLO will be down for an unknown period. LLO ops will contact LHO ops when they are about an hour from relocking. Robert will be doing commissioning work until 13:00.
  The intent bit has been changed to Commissioning.   

Hard to tell glitches from optical manipulation to lockloss spikes with these plots. HAM2 (not used) plots are the only ones that seem off spec. Currently OpLev damping is turned off IFO wide except for BS damping only during acquisition.

All looks well. Powers tracking humidity. Odd, little (very marginal)bump in chiller plots. I don't think this is any cause for concern.

Over the past few days and for the foreseeable future I'm running a python script which looks for ADC,TIM,IPC glitches on the end station computers. It scans roughly once a second (not synced to GPS but rather runs a loop and then waits one second). For all models running on the machines h1suse[x,y], h1seie[x,y] and h1isce[x,y] it reports any STATE_WORD which have non-zero values after the upper bits have been masked. For any model with an IPC error, it scans each IPC receiver channel and reports any non-zero error counts (plus IPC type and name of sender). Any latched errors are subsequently cleared by the once-a-minute issuing of a DIAG_RESET by a cronjob (actually happens at about 3 seconds in the minute).

Once I've accumulated some statistics, I'll post a report.

TITLE: 04/13 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC

STATE of H1: Observing at 59Mpc

INCOMING OPERATOR: Jeff

SHIFT SUMMARY: Been locked for 17 hours. Wind seems to be picking up. 

LOG:

Been locked for 13 hours. A brief Grace DB query failed between 1AM-1:12AM. Wind suddenly picked up an hour ago but died down quickly. Not much else is going on.

TITLE: 04/13 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 64Mpc
INCOMING OPERATOR: Nutsinee
SHIFT SUMMARY:  Locked for the entire shift.  No issues to report for LHO.  LLO is still struggling with relocking.
LOG:  None.

We have been locked for 5.5 hours.  LLO is still currently down and struggling with some mystery noise after the commissioning period today.

I was informed by the Norco delivery driver that the mechanical level gauge (LI105A) at the X-end dewar was not responding to changes in the LN2 level, i.e., it was stuck @ 205" WC.  I investigated and confirmed his observation.  In doing so, I also discovered that the valve connecting the High and Low lines to this gauge (V-7) was open.  This valve is normally closed and shorts out both the mechanical level gauge, as well as, the CDS level transducer which shares these lines and is connected in parallel to the mechanical gauge -> I will repair or replace the mechanical gauge on Tuesday.  For now, I closed V-7.  This should correct the "noisy" level signal that Chandra had noticed on CDS.  

Begin 1 hour standdown.

TITLE: 04/12 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 63Mpc
OUTGOING OPERATOR: Jeff
CURRENT ENVIRONMENT:
    Wind: 9mph Gusts, 6mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.14 μm/s
QUICK SUMMARY:  No issues handed off.  Locked for ~1.5 hours.

  Accepted the following SDF Diffs to go back into Observing

for some cameras their EPICS values were no longer updating, even after restarting their processes via monit. We took the opportunity to patch and reboot the machines h1digivideo[0,1,2]

   Accept SDF diff for IMC-REFL_SERVO_IN1GAIN setpoint -6 to -8

[Vaishali, JimW, Jenne]

During maintenance, while no one needed the IMC, we tried out our new L2A decoupling filter for MC2.  Recall that Jim found that it would be helpful in alog 35330, and we measured and fit TFs for it in alog 35397.

We found that (a) the pre-existing L2A decoupling was in fact worse than doing nothing at all, and (b) that our new filter works well. 

In the attached screenshot, the upper left corner is the Foton Bode plot of our decoupling filter.  In the other 3 DTT panels we have the coherence and transfer functions of 3 different MC2 L2A configurations. For these measurements, the IMC was unlocked, but MC2 still aligned.  The red traces in all panels are with no L2A decoupling at all.  The blue traces are with the old L2A "decoupling" gain.  That was a flat gain, and clearly was making things worse than doing nothing at all, over a pretty broad frequency range.  The green traces are with our new L2A decoupling filter on, and we win almost 20dB of isolation below a few hundred mHz.  

We have accepted the new L2A settings for MC2 in the safe and observe SDF files, so they should always be on now.   

PI mode 19 started to ring up a bit to cause the SUS_PI node to change some of the PLL filters causing an SDF diff. Mode 19 is not one of the modes that we regularly damp while at 30W, but it may have been excited from the wind. I went to clear the SDF diff but just trying to click the unmonitor button would not work, there was an exclamation point next to the "MON" but I'm not quite sure if that was suppose pop up a screen for me that didn't work remotely, or if it was something else. I managed to select the unmonitor all, with only that channel having an FM3 diff, and getting it to accept it that way. I'm worried that this may have accepted the entire filter bank, and there was another screen that I couldn't see that would allow me to choose what parts on that filter bank to monitor.

We are back to Observing and there is a screenshot below of the SDF diff.