TITLE: 08/24 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 51Mpc
INCOMING OPERATOR: Jeff B.
SHIFT SUMMARY: Lost lock for unknown reason. Had to make a significant adjustment to PRM in YAW to lock PRMI. Made it to NLN. While running a2l PI mode 27 ran away and I lost lock again. Succeeded in making it back to NLN and did not attempt to run a2l again. Set to observing. Succeeded in damping PI mode 27 early on.
Have transitioned the INJ_TRANS guardian back to INJECT_SUCCESS.
LOG:

14:47 UTC Closed terminal on nuc3 that was obscuring DARM on control room screenshots.
15:35 UTC Noticed DIAG_MAIN message stating that seismon is not updating. The GPS time does appear stuck at 1187621613.
16:10 UTC Betsy to optics lab.
16:26 UTC Lock loss.
16:32 UTC Gave Aidan remote access.
16:37 UTC Filiberto to mid Y.
17:03 UTC Filiberto back.
17:43 UTC NLN.
17:47 UTC Running a2l.
17:59 UTC Richard to CER.
18:05 UTC Lock loss. PI mode 27 ran away and I could not bring it back.
18:08 UTC Richard back.
18:31 UTC Visitor through gate to see Chandra.
18:32 UTC NLN.
18:35 UTC Observing.
Damped PI mode 27
18:59 UTC Nichole W. to mid X to retrieve Pelican cases.
19:09 UTC Nichole W. through main gate.
19:23 UTC Nichole W. back.
20:19 UTC Set INJ_TRANS to INJECT_SUCCESS.
20:51 UTC Elizabeth to mid Y to pick up parts.
21:14 UTC Elizabeth back.
21:26 UTC Travis and Liz to mechanical room (property control).
21:34 UTC Travis and Liz back.
21:50 UTC Jeff B. moving equipment from LSB to staging building.
22:08 UTC TJ to optics lab.
22:10 UTC Jeff B. done, moving yellow cart to OSB.
22:23 UTC TJ back.

Back to observing after lock loss at 16:26 UTC.

model restarts logged for Wed 23/Aug/2017 - Wed 16/Aug/2017 No restarts reported

[Aidan]

I've been investigating the apparent increase in range that occurred this morning when CO2X was turned off. This would seem to indicate that either (a) the CO2 laser is somehow misaligned/or deformed and causing a very poor lens, or (b) the present level of lensing (SELF heating + CO2) is too much. It's worth noting that the requested (and delivered) levels of CO2X laser power haven't changed significantly over the last four or five months.

If we assume (b) and also that the better range in the past is partially due to a better thermal state, then the conclusion is that either the effective CO2 lens or the SELF heating lens has increased.

I've gone back and looked at the HWSX spherical power data (H1:TCS-ITMX_HWS_PROBE_SPHERICAL_POWER) from two months around the period of the earthquake. The relevant value here is the spherical power change per lock (the difference between the upper and lower levels that are obvious in the time series which shows the transient lens from SELF heating and CO2 laser changes). There is an interesting period form 22-June to 7-July where this trends upwards by approximately 25 micro-diopters (or about 50%). This indicates that the apparent lens change per lock seen by the HWS is increasing significantly.

Two factors also play into this. (1) the CO2 laser is being turned on and off during this time (to keep the thermal state warm when the IFO has lost lock). However there is no significant change in the CO2 power level behaviour over the corresponding time range. (2) we know there is already a point absorber on ITMX as well as uniform absorption. The spherical power value is fitted to the low spatial-frequency lens. The presence of a known high spatial frequency point in the wavefront complicates this. For example, it's possible that the HWS alignment may be drifting and the point absorber is contributing more to the total spherical power value. This obviously needs to be investigated further by looking at the stored gradient fields.

However, it does seem that there is a real effect going on as the range got much better (~15% better) when the CO2 laser turned off. 

Laser Status:
SysStat is good
Front End Power is 33.8W (should be around 30 W)
HPO Output Power is 154.8W
Front End Watch is GREEN
HPO Watch is GREEN

PMC:
It has been locked 9 days, 0 hr 11 minutes (should be days/weeks)
Reflected power = 16.77Watts
Transmitted power = 57.41Watts
PowerSum = 74.17Watts.

FSS:
It has been locked for 0 days 0 hr and 3 min (should be days/weeks)
TPD[V] = 0.9646V (min 0.9V)

ISS:
The diffracted power is around 3.1% (should be 3-5%)
Last saturation event was 0 days 0 hours and 34 minutes ago (should be days/weeks)

Possible Issues:  None
 

Ran through daily svn check.

The ISC_LOCK.py file differs by the addition of two log messages. File is owned by Sheila.

The h1tcscs_OBSERVE.snap file differs only by the date in the header. Not sure if I can revert while in observing mode.
-Time:      Tue Apr  4 18:11:09 2017
+Time:      Thu Aug 24 03:19:07 2017

TITLE: 08/24 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 47Mpc
OUTGOING OPERATOR: Ed
CURRENT ENVIRONMENT:
    Wind: 19mph Gusts, 17mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.09 μm/s 
QUICK SUMMARY:

Range is trending back up.

TITLE: 08/24 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 46Mpc
INCOMING OPERATOR: Patrick (subbing for Cheryl)
SHIFT SUMMARY:

Shift mostly quiet until TCSX acted up. Aiden is making an aLog that includes the latest power adjustment made to recover the original range. I'm not feeling well this morning so Patrick has generously granted me early leave.
LOG:

Verbal Alarm at 13:25

09:29UTC "TCSX CO2 LASER output off" verbal happened. After a trip into the LVEA to find the FLOW light tripped on the controller I went into the mezzanine to check the chiller which was NOT tripped. I went back down and reset the controller and everything looked ok except for some SDF diffs in TCS_ITMX_CO2_PWR,TCS_ITMX_CO2, and DIAG_SDF nodes. I called Jason on the phone and he didn't have to much to say about some new Guardian stuff that has been added. I accepted te DIFFS that were showing and took a couple of screenshots.

10:32UTC LASER won't stay locked. It keeps dropping/searching/locking...rinse, lather, repeat. When it locks, the ready bit goes GREEN and I set the Intention bit but it just keeps falling out over and over again.

10:35UTC maybe it will hold this time?

10:46UTC nope

TITLE: 08/24 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 50Mpc
OUTGOING OPERATOR: Jeff
CURRENT ENVIRONMENT:
    Wind: 1mph Gusts, 0mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY: