cheryl.vorvick@LIGO.ORG - posted 08:10, Saturday 21 December 2019 - last comment - 08:49, Saturday 21 December 2019(54026)
OPS Owl Summary
TITLE: 12/21 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 118Mpc
INCOMING OPERATOR: Camilla
SHIFT SUMMARY: locked in Observe
LOG:
- 09:13 UTC - H0:VAC-EY_Y6_PT427_ERROR went into error
- 13:49 UTC - airplane heard in the CR
- 14:23 UTC - H0:VAC-EX_X6_PT527_ERROR went into error
- Violin mode damping: 08:00 to 15:30 UTC, only gain change tonight is ITMX mode 8, nominal gain = -4, currently at -20 as a test
- ITMX modes 7 and 8, 7 is currently at nominal, 8 is at -20 (relocked with -4, and this has not changed)
- ETMX mode 6, this mode is paired with ETMY modes 1 and 6
- the damping filter width was 0.1Hz, and I reduced the width to 0.02Hz (which is larger than ETMY mode 6, at 0.004Hz)
- this filter is saved, and is ready to be loaded on ETMX mode 6, at the next lockloss
- with the current filter, it's not possible to damp ETMX mode 6 and ETMY mode 6 at the same time
- ETMY mode 6 is at it's nominal gain of 0, and will need to stay off, until the new filter is loaded
- ETMY modes 1 and 6, no changes, just testing tonight
- ETMY mode 1 damping filter width is 0.006Hz, and may benefit from being reduced to 0.004Hz, like mode 6, but I did not make any changes tonight
Attachments:
- left:ETMY mode 6 damping filter bode plot, right: ETMX mode 6 damping filter bode plot, black = previous filter, red = new filter
- power spectra, showing ETMY modes 1 and 6
- power spectra, showing ETMX modes 1 and 6
Images attached to this report
Comments related to this report
Violins - monitor filter updates:
- I've updated the ITMX modes 7 and 8 Monitor Filters
- these are ready to be loaded at next lockloss, or exit from Observe
- these filter changes, and the ETMX damping filter change are showing up on the CDS overview as orange lights on H1SUSPROC and HISUSETMX
- Camilla checked the times of these changes, and those times match my changes