09:16UTC 75.453Mpc

TITLE: 02/13 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 70Mpc
INCOMING OPERATOR: Ed
SHIFT SUMMARY:

Decent shift with H1 up most of the shift, until our lock was ended at 15hrs44min by an Alaska EQ.

SEI_CONFIG:  useism is between the 50 &90 percentile.  Perhaps we should switch the  from WINDY_USEISM_NOBRSY[63]   -->   WINDY_NO_BRSY[60] at next lockloss?   Ed will try this.

Also mentioned to Ed the FM1 filter option for PI MODE26 (which Cheryl handed off to me).

LOG:

• 5:36, 6:37 TCSy Chiller flow low alarms
• Bumps heard outside:  7:20:04 (outside control room)
• 7:28 Alaska EQ Lockloss which took down several ISIs (ITMx, ITMy, & ETMy) & SUS ETMy
• Had issues with bringing back the ETMy SUS!  (see here)
• 7:32 H1IOPASC0 RESET
• Handing over H1 with it still down due to earthquake.  
• OBSERVATORY MODE continues to be in EARTHQUAKE state.

After tonight's Alaska earthquake, we had several ISIs trip.  For ETMy, the watchdogs were RESET, but it tripped again while trying to ISOLATE, AND it also tripped the ETMy SUS.  No biggie methinks.....

When I tried to Reset ETMy, had the message that the L1 stage was tripped.  Hitting the RESET button could not clear the L1 trip.  The L1 output values were well below the RMS threshold value of 8000 counts, so was perplexed that the Watchdog would NOT RESET!

• Compared ETMx to ETMy (nothing looked obviously different)
• Couldn't find anything through quick search through alog
• Couldn't find anything in Jenne's troubleshooting document
• Ed arrived and he start investigating.

I was working on the left-ops workstation while Ed was on the right (new) workstation.  When he left the room, I made another attempt to RESET, AND this time it worked :-/  Nothing done was different.  Ed noticed that this was our first time trying something from the a different workstation.....we're wondering if the new workstation could have been the issue??  This is just us speculating because we couldn't see anything else which was done differently.

Anyway....we are back & Ed is on his way to recovering us from this late-night EQ jolt.

• EQ seen at:
  • posted on USGS at 7:17 (noticed browser at 7:20)
  • Terromon Never Reported
  • H1 Tidal signals 7:26
  • 0.03-0.1Hz peak at 7:27 7.0um/s
• Magnitude:  5.5
• Location:  Alaska
• Starting time of event:  7:26
• Lock status?  H1 lockloss

H1 Going on 12.5Hr lock with fairly quiet conditions.  

MODE26 is a bit fat looking (as Cheryl alogged).  

TITLE: 02/13 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 68Mpc
OUTGOING OPERATOR: Cheryl
CURRENT ENVIRONMENT:
    Wind: 4mph Gusts, 3mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.32 μm/s
QUICK SUMMARY:

• H1 purring along approaching 9hrs. 
• Cheryl mentioned during next lockloss I could swtich to a different bandpass filter for PI MODE26 (take FM10 --> FM1)
• DIAG_MAIN Messages about
  1. NO BRSy (SEICONFIG in "WINDY_USEISM_NO_BRSY" state)
  2. HWSx Code Stopped Running
• L1 had a lockloss within the hour, but has just rejoined us for some nice double-coincidence running.
• nuc5 useism/STS DMT Viewer was down.  Walked to computer and got it going via the keyboard/mouse that are connected to nuc5.
• Robert is also here in the Control Room

TITLE: 02/13 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 71Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: locked all shift
LOG:

• 22:30UTC - Kyle drives to Mid-Y
• 23:14UTC - Kyle call to say he's leaving Mid-Y
   

I didn't feel comfortable with the extreme change in fill time for CP4 of late being just the increase in ambient temperature alone.  As such, I decided to do another fill at the 48 hr. mark instead of waiting for the nominal auto fill which wouldn't be until Monday (72 hr. mark).  

Attached is the data.  Any chance that we are seeing the needle/seat beginning to show signs of an ice ball obstruction?  "I'm just saying!"  As shown in the plots, I set the LLCV to 70% open for 30 minutes and then increased it to 100% open.  The exhaust temperature finally responded 5 minutes after being increased to 100% open.  I went out of the building and cracked the manual bypass valve and personally observed LN2 at the exhaust.  I increased the nominal value to 44% from 42%.  

Note that I also verified that the valve stem pointer does agree with the CDS 4-20 mA output %open values so it isn't like the valve isn't opening etc...  Also, the dewar head pressure is ~10 psi, which when combined with the liquid height should be more than adequate to make the elevation "hump" into the 80K pump etc..  

Description:

• current gain = 700000
• phase for damping filters still at +30deg phase
• phase for PLL phase channel is -36deg, started at -30deg phase this morning
• PI drive out signal is going on and off, though the PLL appears to remain locked
• PI drive out signal is at most +/-400 when it is on, more typical value is +/-200
• gain has little effect on PI drive amplitude at this point - a limiter somewhere?
• amlitude of the peak in OMC PI is hovering around 630
• before this, when PI drive out signal was staying on all the time, I noticed that anything less than +/-400 counts on the signal did not damp, just maintained the RMS
• when I increased gain there would be some reduction of the RMS, but it wouldn't continue, so I'd raise the gain again, same effect, until the PI drive signal started going on/off
• is seems like raising the gain this high might have triggered some protection limit, but lower gain didn't damp, so mode 26 cannot be effectively damped

The one change I did not try was to change the bandpass filter back to FM1, where it was a week ago, from FM10 where it is now.

Plots attached:

• plot 1: PI mode 26 RMS (cyan), around 0.235
• plot 2: PI drive to ETMY (purple), going on/off
• plot 3: PI modes 26 (cyan), 27 (red), and 28 (gray), for comparison, all on the same scale
• plot 4: peak at 15009.6

TITLE: 02/12 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 70Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 2mph Gusts, 1mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.34 μm/s

QUICK SUMMARY:

• Jim had H1 locked and was damping PI mode 27 when I arrived
• I took over and made changes to mode 26, which has been hard to damp, with some improvement
  • gain = +150000
  • damping filter bank - removed +60deg phase filter and now have only +30deg phase filter engaged
  • I started tracking the magnitude of the peak at 910 (blue), and it's currently at around 695 (red)
  • PI damp out was up to around +/-2000 counts, and is now around +/-500 counts

05:01:52UTC  70.623Mpc

03:56UTC Nothing showing in USGS or Terramon but a really sharp rise from ≈.01µm/s to ≈.8µm/s and then a rapid decay.

04:08 4.8 in Canada. We got sucker punched and didn't even know what hit us until 10 minutes after Lockloss. Courtesy of USGS

TITLE: 02/11 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 71Mpc
INCOMING OPERATOR: Ed
SHIFT SUMMARY: locked entire shift, tried some damping on mode 22 and mode 23, and tried to damp mode 26
LOG:

• tour 1: 20:12UTC
• tour 2: 22:00UTC
• 17:30-20:30UTC, I tried to damp modes 22 and 23, and mode 26, not worse, not better
  • mode 26 is at -170000 gain, and still PI damp out is still only +/-200 counts
  • modes 22 and 23 are off, but I left the phases that I tried

Cheryl, Kiwamu, Sheila

This morning Cheryl went into the PSL and saw that the rejected beam from the thin film polarizer after the rotation stage was hitting the edge of the steering mirror which sends it to a beam dump.  (She has nice photos of this).  This aftrernoon she, Kiwamu and I went into the PSL to fix this.  

We first adjusted the position of the iris after the bottom periscope mirror, and added two steering mirrors, and iris and a beam dump to the path to the OSA so that we would have good alingment references for the beam leaving the table.  We then turned the power down before the PMC, and using base plates as markers moved the entire TFP assembly 5 mm closer to HAM1.  Kiwamu took some photos of the resulting beam position on the steering mirror which are on Cheryl's camera.  The beam was then high on the beam dump apperature, so we changed the spacer in the beam dump mount for a thicker one.  We turned the power back up, and checked the beam on the irises and the persicope PD.  

Cheryl's photos from this morning suggested that there could be clipping on the output apperature of the EOM.  We tried to determine if this was clipping or a back reflection, but can't say for sure.  Now we are out of the PSL, the IMC relocked without problems, and Jeff B has started inital alingment.