TITLE: 03/09 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Jim
SHIFT SUMMARY:
Started off shift with H1 making it to NLN. Then there was the weekly Monday calibration measurements, some commissioning, and mostly observing today. There was some tumbleweed work as well. Tour will be visiting
LOG:
- ~14:45 X-arm tumbleweed work (tyler, roger)
- 15:58 -16:04 Driving Big Green around LVEA from X to Y
- 15:22 Back to OBSERVING
- After ~3 early ALS locklosses & then 3 lockloss at later steps in locking.
- 17:29 Optics Lab for gear (Cheryl)
- 17:45 MY visit to check HVAC (Bubba)
- Taking Big Green over the Access Bridge for tumble weeds
- 18:12-18:15 starting over bridge
- 18:00 out of Observing: Calibration work begins. (Jeff K)
- 19:30 - 19:36 Quick post calibration commissioning work by Jenne & Robert in prep for Maint tomorrow.
- 19:37 Back to OBSERVING
- 18:06 hr of cleaning at MX (Vanessa)
- 18:23 & 20:57 Trips to MY (paperwork on crates) & EY for LN dewar paperwork (Christina)
- 18:56-19:08 Measurements at MX (Kyle)
- 20:14 - 20:16 Out of Observing due to accidental IM excitation (Cheryl)
- 21:41 - 21:57 Approved PEM Commissioning time (Robert)
- 21:45 - 21:48 Drive over access bridge (Tyler)
- 22:30 - 22:50 ETMx violin mode 13 & 16 were ringing up (they took a big step up during the calibration measurement at 19:07); (thanks for catching this, Cheryl!).
- Took both modes from gains of 0 to higher gain values approaching their "nominal" of 30. Currently watching them both drop from above 4.0 down 2.0. And I then took the gains for both modes back to 0.
- 23:00 At 0 gain, both modes flattened out and then started to increase again. So they were both increased from 0 up to 40 this time.
- Have notified Rahul about this.
- 22:50 Transitioning LVEA to laser SAFE (Ed)
I checked that the nominal (and max) gains for ETMX mode 13 and 16 is 30 (in the lscparams). However the gain which was applied was 40. I believe this to be a typo while feeding the gain or did you/Cheryl deliberately tried higher gain for damping them?
As noted in my log, I saw modes ringing up again at around the end of my shift, so I took the gains to 40 to see if this would take violins back down. This is what I handed off to Jim last night.