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Message ID: 17102     Entry time: Wed Aug 24 12:02:24 2022
Author: Paco 
Type: Update 
Category: SUS 
Subject: ITMX SUS is sus UL glitches? 

[Yehonathan, Paco]

This morning, while attempting to align the IFO to continue with noise-budgeting, we noted the XARM lock was not stable and showed glitches in the C1:LSC-TRX_OUT (arm cavity transmission). Inspecting the SUS screens, we found the ULSEN rms ~ 6 times higher than the other coils so we opened an ndscope with the four face OSEM signals and overlay the XARM transmission. We immediately noticed the ULSEN input is noisy, jumping around randomly and where bigger glitches correlated with the arm cavity transmission glitches. This is appreciated in Attachment #1.


Signal chain investigation

We'll do a full signal investigation on ITMX SUS electronics to try and narrow down the issue, but it seems the glitches come and go... Is this from the gold satamp box? ...

Attachment 1: ITMX_UL_badness_08242022.png  257 kB  Uploaded Wed Aug 24 13:06:18 2022  | Hide | Hide all
ITMX_UL_badness_08242022.png
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