Reports until 11:27, Friday 14 July 2017
H1 AOS (SUS)
corey.gray@LIGO.ORG - posted 11:27, Friday 14 July 2017 - last comment - 12:20, Friday 14 July 2017(37527)
Violin Modes Rung Up Again!

During current lock:

Jenne had me quickly maintain lock by:

This calmed things down.  Then moved on to Violin Modes.

ETMx MODE4 (505.805Hz) was once again the largest rung up violin mode.  Have stayed with positive gain, and played with increasing it & also fiddling with phase, but not having luck with that yet.

* See Sticky Note for how to change the Manager Flag from "User" to "ISC_LOCK".

Comments related to this report
corey.gray@LIGO.ORG - 12:20, Friday 14 July 2017 (37528)
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Not sure anything I did improved anything or if it was just time allowing the ETMx MODE4 to ring down on its own & get to a value where we could finally go back to locking (Spent about 45min tweaking on violin modes).

Kiwamu took a look at spectra of RMS of OMC_DCPD_A_IN1 & OMC_DCPD_B_IN1 & they looked fine to ADD_WHITENING.  So I went ahead and did that:

  • Go to OMC_LOCK node
  • Go to MANUAL
  • Select ADD_WHITENING state & wait for it to complete
  • Select READY_FOR_HANDOFF
  • Go back to AUTO  Edit:  Go to Manual (& Manager: will list this node as being managed by YOU, "User", etc.  You will want to change this to ISC_LOCK at some point*)

BUT....I must have not done something write here, because the ISC_LOCK complains about OMC_LOCK no longer being MANAGED by ISC_LOCK.  How do we get it to reclaim OMC_LOCK?

* See Sticky Note for how to change the Manager Flag from "User" to "ISC_LOCK".

Either way, back to NLN.

VIOLIN_MODE_DAMPING_1 Issue?

Since these violins appeared to ring up as we were raising power & went through the VIOLIN_MODE_DAMPING_1 guardian state, does this mean we might still have an issue with the Guardian settings for the Violin Modes?