Reports until 17:41, Wednesday 03 January 2018
H1 SUS (CDS)
jeffrey.kissel@LIGO.ORG - posted 17:41, Wednesday 03 January 2018 (39976)
H1 SUS SRM Top Mass (M1) OSEM Noise Problems Alleviated
J. Kissel, R. McCarthy, P. Fritschel 
FRS Ticket 5063
Prior LHO aLOGs 13556, 14357, and 21481

In perusing the list of closed FRS tickets after the Sep-Dec 2017 vent, Peter found that the above mentioned FRS ticket 5063, "H1 SRM osems (LF RT SD and T3) have excess noise" had been closed without supporting data. Richard clearly states in the most recent comment that the problem was a prominent screw head grounding against the chamber in-vacuo, but just didn't get the chance to post the data.

Attached is the supporting data. Where, in the past, SRM had shown prominent features and combs originating from large peaks around 1700 Hz and 1900 Hz, there are no such features visible in any of the OSEMs on SRM. For random comparison, I show SR3 top mass OSEMs as well.
Images attached to this report