evan.hall@LIGO.ORG - posted 15:56, Friday 27 September 2019 - last comment - 16:57, Friday 27 September 2019(52166)
DARM FOM reference updated
【Jeff, Evan】
We updated the DARM FOM with a reference from a few hours ago. The old reference (from May 2019) did not reflect several improvements in the noise; e.g., the elimination of certain lines. We do not want to lose track of these improvements during recovery from the vent.
In the attachment, gold is the new reference (116 Mpc) and black is the old reference.
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A list of improvements major (hardware / configuration / controls) changes I would consider as the major contributors to the improvement: - Increase in input laser power from 35 W to 37 W (LHO:49783) - Notching of SR3's bounce mode at 27.71 Hz (LHO:49649) #LSCFellows - PRCL feedforward creation and improvements (LHO:51553) #LSCFellows - Finding and destroying the 48 Hz feature by blocking a beam at a HAM3 viewport (LHO:52136) #LSCFellows - Updated calibration (LHO:51819)
The DRMI FOM was also updated to today's noise curves (the old ones were from O1).
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