This morning before maintenance really took off, we tried switching blends on all of the BSCs, while the IFO was still locked. Contrary to my findings a couple weeks ago (alog 23610), it now seems like it's possible to switch blends while the IFO is locked and not break lock. We started out carefully, switching only the ETMs, one at a time, then the corner station ISIs. We then tried a little faster, doing the corner station all at once, then both ETMs. Finally, we switched all chambers all at once. For each of these tests, we switched from our nominal 90mhz blends to the 45mhz blends then back. The lock survived each switch, although the ASC loops would ring up some, especially when we switched the ETMs.  The corner station ISIs didn't seem to effect ASC as much.

The only IFO difference I know of between the last time I looked at this and now is that Hugh went down and recentered the ETMY's T240s. Environment is also different today, with pretty quiet winds (<10mph) and only moderate microseism (rms < .5 microns).

The attached trends are for the ASC D/C Hard, D/C soft, ETM oplevs and corner station oplevs. Similar to what I found a while ago, ETMY seemed to have the biggest effect on the IFO (based on what we saw on the ASC foms in the control room), although the ITMY oplev actually moved more. Still, the oplevs didn't see more the about 1.5 microradians motion at any point.

You can also tell what blends were running on the traces based on the eye-ball rms of the ASC signals. The 90mhz blends don't filter out the microseism which is moderate today, so the ASC pitch signals get noisier. This is also visible on the oplevs.

Title:  12/01/2015, Day Shift 16:00 – 00:00 (08:00 – 16:00) All times in UTC (PT)
	
State of H1: 16:00 (08:00), The IFO locked at NOMINAL_LOW_NOISE, 22.3w, 79Mpc. In Commissioning mode. 

Outgoing Operator: TJ

Quick Summary:  Start of maintenance window.   

Doubling these limits should virtually eliminate locklosses of the nature reported here.

The SDF has been updated, both OBSERVE and safe files; and they are committed to the svn.

• Title: 12/1 OWL Shift: 08:00-16:00UTC (00:00-8:00PDT), all times posted in UTC
  

• State of H1: Maintenance Tuesday
  

• Shift Summary: Still cruising on a 28 hour lock. The DARM spectrum was getting a tiny bit noisy in frequencies < 50Hz for the last hour or two (that I noticed at least). Since LLO was down and the inpending maintenance day upon us, I didn't do look too far into it.

• Incoming Operator: Jeff B

• Activity Log:

• 15:46 - Out of Observing
• 15:55 - Jeff B into LVEA to take data readings near 3IFO storage area.
• 16:01 - Peter K into PSL enclosure.
• 16:04 - Joe to EY to charge scissor lift
• 16:08 - Jeff B back

Just checking on the reference cavity transmission, which continues to fall.  The ambient
temperature didn't change much.  Doesn't appear to be due to variation in the pre-modecleaner
transmission, nor temperature.

Starting some maintenance tasks since LLO has been out. We are currently still locked, but that won't last for long.

*****
Incident Type
--
Scheduled Outage

Start Date and Time
—
2015-12-15 9:00 CST (UTC-6)

End Date and Time
--
2015-12-15 ~12:00 CST

Service(s) Affected
—
This outage is required to move GraceDB onto new hardware. (GraceDB is currently running on temporary hardware after the unscheduled outage on Nov. 13th.) During the migration, GraceDB will be unavailable for a time period of ~hours.

--
Please direct all questions to uwm-help@gravity.phys.uwm.edu

Observing at 73Mpc for 25 hours.

Environment calm. There have been a handful of glitches, but it doesn't seem like anything out of the ordinary.

• Title: 12/1 OWL Shift: 08:00-16:00UTC (00:00-8:00PDT), all times posted in UTC
  

• State of H1: Observing at 78Mpc for the last 20hrs
  

• Outgoing Operator:  Travis

• Quick Summary: Travis had it easy, still locked from my shift yesterday. Wind minial, useism 0.4 um/s, all lights off, CW inj running, timing error on H1SUSETMY, IPC error on H1ISCEY (I'll clear them when I get the chance).

Title: 11/30 Eve Shift 0:00-8:00 UTC (16:00-24:00 PST).  All times in UTC.

State of H1: Observing

Shift Summary: Very quiet shift.  Only 6 ETMy saturations not related to any RF45 glitching.  20 hours of coincident observing with LLO.

Incoming operator: TJ

Activity log: None

Nothing of note.  A few ETMy saturations not related to any RF45 glitching.  Coincident observing with LLO just over 16 hours.

Laser Status:
SysStat is good
Front End power is 31.28W (should be around 30 W)
Frontend Watch is GREEN
HPO Watch is RED

PMC:
It has been locked 6.0 days, 7.0 hr 24.0 minutes (should be days/weeks)
Reflected power is 1.635Watts and PowerSum = 25.14Watts.

FSS:
It has been locked for 0.0 days 14.0 h and 16.0 min (should be days/weeks)
TPD[V] = 0.7883V (min 0.9V)

ISS:
The diffracted power is around 8.313% (should be 5-9%)
Last saturation event was 0.0 days 14.0 hours and 16.0 minutes ago (should be days/weeks)
 

At 12:58:31 PST the IOP for h1susey took 69uS for a single cycle which in turn caused a single IPC receive error on h1iscey.  This TIM error has been occuring approx once a week for EY, in this case it is the IPC error which is unusual. We should clear these accumulated errors the next time we are not in observation mode or during Tuesday maintenance, whichever is the soonest.

TITLE:  11/30 DAY Shift:  16:00-00:00UTC (08:00-16:00PDT), all times posted in UTC     

STATE of H1:  Locked at 72Mpc for 12+hrs

Incoming Operator:  Travis

Support:  None needed

Quick Summary:  Very quiet shift with H1 hovering between 75-80Mpc.  0.03-0.01 seismic is noticeably trending down over the last 24hrs.  useism is holding just under 0.5um/s (so we still have 45mHz Blends ON).  

Shift Log:

• ETMy Saturations:  16:43, 16:47
• 17:21-17:26 CER temperatures high and Richard is going to check.  He will tread lightly & we will stay in Observring during his incursion.
• 17:26 Xarm Beamtube work (Joe & Chris)----> This work CANCELLED due to non-functioning man-lift & freezing conditions.
• 17:50-18:00 Addressing frozen chemical bunker door (bartlett)
• 18:46 Minivan at Receiving  (Manny)
• 18:49 (also after lunch) Work in Optic Lab (Betsy)
• Corner Station Air Handler is having another HIGH, MAJOR alarm
• Checked Visitor list in Control Room to make sure it is current.
• 20:35 Monthly Alert System Test phone call received
• 21:11 High EY temperature alarm starts (Bubba & John were actively working on this & are the culprits!)  :)
• 22:00 Can't restart Verbal Alarm; restarted around 23:53
• 22:44-22:53 Optics Lab visit (Joe D.)

Last Tuesday (24th Nov) Jim and I modified the monit on h1hwinj1 machine such that when it restarts the psinject process it smoothly ramps the excitation amplitude over a time period of 10 seconds. We manually started the new system on Tuesday and since then there have been no crashes of psinject until the last 24 hours. There have been 4 stops (with subsequent automatic restarts) in the past 24 hours, each stop was logged as being due to the error:

SIStrAppend() error adding data to stream: Block time is already past

Here are the start and crash times (all times PST). Monit automatic restarts are maked with an asterix

On Nov3, the ITMY Coil Driver was powered down in an attempt to clear its brain which had been giving false bad status indicators.  We also changed the code so as to not drop out during these glitches, see T1500555.

Trending the channels show no status drop outs since the 3 Nov power cycle.  Before the power cycle, the status had indicated a problem erroneously several times with at least twice dropping the IFO out of observing.

VerbalAlarm script was stopped, but unfortunately when trying to restart it, I get an error (see below).  Not sure of a back-up alarm system to employ if this goes down.  I have the Calibration medm (with GraceDB up on my work station), but not sure what else we should have up as a back up.