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

01:05 - 1:12UTC (roughly) Momentary loss of sanity. Reverted all SDF diffs and went back to Observing. Apologies.

00:49:44UTC Observing 1 hour standown time protocol. LLO and LHO are locked in coincidence.

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

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 68Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 3mph Gusts, 2mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.31 μm/s
QUICK SUMMARY:

• H1 locked for 11 hours
• a bit glitch about 30 minutes ago
• nothing else to report

So it seems there WAS a cause for my previous locklosses, not that I could tell from StripTool. It seems that mode 26, although on a steady rise, was the culprit. It never broke the visual threshold of what is normally considered 'ringing up' but after speaking to Terra on the phone from LLO control room she had me wait at DC readout until it rang down below the noise floor. She called back  at that point and I began taking H1 all the way up. Upon continuing the it began to shoot up linearly with the power increase so she began damping remotely. Long Story short, this slow moving PI mode kept the PLL for damping at bay. When it finally locked it took 10s of thousands of counts in gain to finally keep the mode at bay and begin to turn it. Previously, on Patrick's shift she reported that it took an almost equal dramatic DECREASE to achieve damping. 

New Modes 22 and 23, I'm told, ring up after ≈ 4 hours into the lock. I may not see them tonight. Those gains and phases are currently set to zero. Initially the gains can be adjusted 1000 counts at a time according o what Terra told me.

Not much else to tell about the night so far that I haven't already logged.