Damping of rung up violin - dropped OBS MODE for ~20 mins:
Sheila pointed us to set the Violin Mode Guardian state to DAMPING_ON_SIMPLE which then allows for manual tuning of the gains of any mode. (At the moment, the guardian looks to see if the mode is ringing up, then turns off the gain and hollers at the operator. It does not do any auto-intervention.) The manual intervention is:
- Go to violin Guardian DAMPING_ON_SIMPLE
- Adjust gain of problem violin mode (in our case turned back on the -3 gain for ETMX mode9)
- Watch on ndscope for mode to turn over, also watch others since now guardian isn't looking at any mode
When mode looks like it has turned over and is ringing down
- Set guardian to IDLE (to recollect the current status)
- Set guardian back to DAMP_ON_DC (guardian back on watch duty now)
- Go back to OBS MODE
I have updated the CDSWiki page which shows the step by step process for damping the violin modes. The link to this wiki can be found on the VIOLIN_ALL_MONITORS.adl medm screen (click - Open Violin Mode Wiki). I will update the link on the LHO Operator wiki page (since this the troubleshooting page for the Operators present during the shifts).
The old sets of instructions (valid for O2) is now obsolete (old version - ViolinModeDamping101).