• gouy phase is around 88deg
• beam waist size between GigE cameras is 150um
• at 30W input to the IMC, the IO beam at IO_lens3 = 42mW
• this beam is attenuated using beam splitters in the beam path between lenses
• at 30W input there is 105uW on each GigE camera

Beam spot measurements: according to these measurements, the beam spots from before to after the 5.8M EQ, and all changes are 0.14mm or less.

Dave and TJ:

we rebooted h1guardian0 because its loading has been regularly in the 50's. TJ recovered the GRD nodes following the reboot.

Looking over the trends, since the interface chassis was restarted and power cable secured, I see no large glitches, especially on corner3 only, that aren't seen on all CPSs and that are not related to ground motion.  Can't access FRS to give a number but I'll keep an eye on this for a few more days.

This morning I performed the weekly PSL FAMIS tasks.

HPO Pump Diode Current Adjust (FAMIS 8431)

I adjusted the HPO pump diode currents, changes summarized in the table below.  All adjustments were done with the ISS OFF.  I have attached a screenshot of the PSL Beckhoff main screen for future reference.

I then tweaked the DB operating temperatures.  The only change was to DB1, all diodes changed from 29.0 °C to 28.5 °C; no changes were made to the operating temps of DBs 2, 3, or 4.  The HPO is now outputting 154.9 W and the ISS has been turned back ON.  This completes FAMIS 8431.

PSL Power Watchdog Reset (FAMIS 3659)

I reset both PSL power watchdogs at 16:26 UTC (9:26 PDT).  This completes FAMIS 3659.

Tried two different browsers;

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IFO in Observing for past 4 hours. Environmental conditions are good. A2Ls are both below reference. Range is holding around 48Mpc.  

TITLE: 07/17 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 47Mpc
INCOMING OPERATOR: Jeff
SHIFT SUMMARY:

Main issue of the evening was a 7.7 Earthquake.  There was some initial confusion with which ISI_CONFIG state to go to after the EQ (it knocked us out without much heads up).  Originally went to LARGE_EARTHQUAKE_NOBRSXY, but then switched to EARTHQUAKE_V2--ultimately went to the correct LARGE_EARTHQUAKE_NOBRSXY.  Then it was a waiting game for most of the shift.  

H1 has noise starting from 25+Hz giving us a range of 45Mpc.  

We worried about violin modes, but they seem OK (under e-15).
LOG:

• Rebooted alarm0 computer because Alarm Handler was not opening and Verbal was not letting us know about an EQ lockloss....
• ~23:49  7.7 Russian earthquake hits us and takes down SEI & SUS systems
• 1:34  TCSy low chiller alarm.  Added 250mL
• 2:25  Successfully isolated remaining ISIs:  HAM2 & 3.
  • IMC immediately then locked up.
• 3:40 GRB alert acknowledged by both sites
• 3:44 ISI Config:  BIG EARTHQUAKE NO BRSXY --->  WINDY
• Finally got H1 to OBSERVING in the last hour, but it broke lock...while I was frantically trying to damp MODE28.
• Returned to NLN just as Jeff arrived.  He is currently working on PI MODE28 (& it looks to be good).

ALSx is fine.

ALSy has not been able to stay locked in a 00.  I've tried tweaking on the ETMy to no avail.  I am currently on LOCKED_NO_SLOW_NO_WFS, and wanting to reduce WFS & CAM signals for the Y-arm, but it simply doesn't stay locked long enough for me to relieve the large output values.  

All SEI & SUS systems are back.

Going to check on IMs and then return to locking.

P.S. EQ was upgraded to 7.7

J. Kissel

As we're getting slammed by another earthquake, I wonder if there can be a few things that team SEI can change in order to get the SEI platforms back to DAMPED (HEPI robust isolated on L4Cs, HAMs Damping with GS13s, BSC ISIs damping with L4Cs and GS13s) and optics back to DAMPED as soon as possible. Here're the flaws I see at the moment:
(1) SEI_CONFIG manager doesn't turn off BSC-ISI Z sensor correction (at least in EARTHQUAKE_v2), so giant EQs like the current still push HEPI in Z enough that it makes the T240s angry and trips the ISI's watchdog, even though the T240s aren't yet involved in any active control. The SEI manager should have a state where it turns off ALL sensor correction, not just horizontal sensor correction.
    EDITNevermind => I had not read Jim's updates to the SEI_CONFIG Guide. We should be in LARGE_EQ_NOBRSXY, and that does indeed turn off ALL sensor correction.
(2) This may be hard, but it would be best if the T240s weren't in the watchdog system until they're used.

Just planting the seed for discussion, no need to pull out ECR pens just yet.

In the SEI World:

Waiting on BSC ISIs to come back.  Jeff is looking at them.

• All BSC ISIs & HEPIs tripped (After 30min, could not restore due to T240s railing and tripping the WDs...will give them more time)
• All HAM ISIs tripped (Able to damp these within 10-20min)
• HEPIs tripped:  HAM1, BS, ETMx, ETMy, ITMx, ITMy,
• Able to get HAM1 HEPI to ROBUST_ISOLATED after about ~35min, as seismic became quiet)   

In the SUS World:

Jeff K said these most likely tripped due to the SEIs tripping, so these were damped as a first order & they all came back fine.  

• HAM2 Optics:  IM1, IM2, IM3, IM4, MC1
• HAM3 Optics:  MC2, PR2
• HAM4:  SR2

Will look at IM pointing next, lock up IMC & wait for BSC ISIs.

TITLE: 07/17 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 47Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 11mph Gusts, 7mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

H1's in OBSERVING w/ DARM spectra elevated from 25Hz & above, thus giving us a range hovering at ~46Mpc.

TITLE: 07/17 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 47Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Most of the day spent with Fast Shutter, PSL trip slowed things down earlier
LOG:

15:00 I came in and several chambers were tripped from the 6.5 in Russia, I recover and start IA

15:00 Richard to LVEA to cycle fast shutter chassis

15:30 PSL Trip, Jason is called, recover takes ~hour

18:30 After 2 rounds of IA, I make it to DC Readout, Richard and I test fast shutter which breaks lock, next several hours are spent trying to convince ourselves (commisioners, et al.) that the fast shutter is working normally, but locking is easy at this point

21:40 NLN, waiting for PI and A2L to run

22:30 Observing, with awful range
 

J. Oberling, E. Merilh, J. Warner

The PSL tripped this morning, likely due to the flow in laser head 3.  As can be seen in this alog, the flow in head 3 (and only head 3) dropped from 0.52 lpm to ~0.47 lpm sometime on the morning of Saturday, 7/15/2017.  It is likely this was the cause of the laser trip.  I will do more forensics when I am onsite tomorrow.  When restarting the cyrstal chiller, the flow in laser head 3 was back up around 0.54 lpm.  Maybe something worked its way through the system, causing the laser trip?

When restarting the laser, the Beckhoff software appeared to lose communication with the hardware of the PSL, requiring a reboot of the PSL Beckhoff PC.  Once this was done, everything worked fine and the laser came back up.  I had difficulty injection locking the 35W FE to the HPO; I believe this is due to the lower power out of the HPO.  I engaged the injection locking by turning the RAMP OFF, and monitoring the power circulating in both directions of the HPO.  When the circulating power favored the forward direction, I manually engaged the injection locking.  This worked the first time and the laser is now back up and running.  Ed re-engaged the PMC, FSS, and ISS, and Jim reset the NPRO noise eater.  By this time ~30 minutes had elapsed, so I engaged the LRA and the power watchdogs.  The laser is now up and running.

J. Kissel filed FRS 8539 for this trip.