TITLE: 07/12 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Earthquake
INCOMING OPERATOR: Patrick
SHIFT SUMMARY:
H1 recovery continues. First part of shift had HEPI Pump trip, then had issues getting to DC Readout due to a finkicky OMC. Jenne & Kiwamu addressed the OMC & then Jeff Kissel, Hugh, & myself addressed many violin modes. Jim took care of burdensome PI modes which came up. So it has been a team effort. Made it to Nominal_low_noise, but after skipping a few guardian steps. While here for a couple hours, we worked on damping violins.
Most of the violin modes seemed to only need gain changes, but Jeff K. ran into a few modes which actually needed phase/sign changes. So when the Guardian VIOLIN_MODE_DAMPING step kicks in, it has tweaked gains to old values and has caused us grief by ringing up violin modes.
Jeff had some useful dtt templates for violin mode damping to use along with a striptool. They are located here:
ligo/home/jeffery.kissel/Templates:
- H1DARMIN1_forViolins.xml (fast one)
- H1DCPDs_forViolins.xml (slow, higher resolution)
Recovery continues.
LOG:
- 15:34 Karen heading to end stations to install mouse traps
- 15:55 - 16:30: EX HEPI Pump Station Trip: Hugh heading to investigate, most likely a voltage trip.
- 17:03 ENGAGE_SRC_ASC & Kiwamu removing OMC Whitening filters
- saw POP90 & RF90 drift on StripTool, Kiwamu guessed it was SRM, so he zero-ed out dither gains for them and tried to tweak the SRM in yaw, but accidentally went the wrong way and broke lock.
- Fundamental violin mode (~500Hz) at just under e-12. Had multiple people each working on different multiple modes for the next few hours.
- 19:33 Liz brought in Moses Lake tour
- 20:20 Kiwamu going in LVEA checking impedence setting OMC DCPD
- 22:14 Lockloss due to ITMy MODE3 ringing up
- 22:38 Kyle to Xmid