corey.gray@LIGO.ORG - posted 15:10, Wednesday 05 April 2017 (35351)
Damped Out 4.735 kHz Violin Mode
While in double coincidence, Sheila happened to catch that H1's 4734.75 Hz violin mode was ringing up. To nip this in the bud, H1 was taken out of OBSERVING to damp this mode out. With StripTool & DTT in hand, made adjustments to the ETMy MODE10 Filter Bank. What was done to damp it out:
- FM9 (+30deg5k) was turned ON, but this immediately rung up the mode more.
- Kept FM9 ON & also turned ON FM6 (-60deg5k), and this immediately damped out 4735Hz within minutes.
Out of OBSERVING from 20:17 - 20:24.
ACCEPTED the new MODE10 diffs, but should still commit the new snapshot to the SVN.
Images attached to this report
