cheryl.vorvick@LIGO.ORG - posted 08:23, Thursday 01 December 2016 (32059)
Violin Damping - ETMX mode4 damped with many changes, ETMY and ITMX small changes
- After numerous lock losses that came with many saturations, I relocked and I spent some time looking at the violin modes since all were very rung up.
- It was near impossible to damp ETMX mode4, so I turned it off and focused on modes 2 and 3, with some success.
- I returned to damping mode4, and after turning off a filter in mode2, I could damp mode4.
- When I turned off mode2 FM5, N505.710, immediately the mode2's signal decreased in amplituded, and mode4 started to decrease.
ETMX changes:
| mode 1 | gain: 50 -> 100 |
| mode 2 | gain: 0 -> 150, FM3 engaged (+60deg), FM5 disengaged (N505.710) |
| mode 3 | gain: 100 -> 300, FM3 engaged (+60deg) |
| mode 4 | gain: set by guardian -> -120 |
| mode 5 | gain: 30 -> 100, FM3 engaged (+60deg) |
| mode 6 | gain: -100 -> -300 |
| mode 7 | gain: 150 -> 300 |
| mode 8 | gain: 50 -> 200 |
ETMY changes:
| mode 6 | gain: -24 -> -60 |
ITMX changes:
| mode 1 | FM3 engaged (+60deg) |
Bounce Mode Damping: I increased the gains
| ETMY | gain = 0.3 |
| ETMX | gain = 0.3 |
| ITMX | gain = 0.5 |
| ITMY | gain = 0.5 |
After relocking, the ETMX changes didn't work exactly as they did in my lock - picture attached.
- Attachment 1: ETMX mode 4 damping
- Attachment 2: same settings on relocking
Images attached to this report
