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Entry  Fri Oct 18 17:35:07 2019, gautam, Update, SUS, ETMX sat box disconnected 
    Reply  Mon Oct 21 16:02:21 2019, gautam, Update, SUS, ETMX over the weekend filteredData.pdf
Message ID: 14982     Entry time: Mon Oct 21 16:02:21 2019     In reply to: 14977
Author: gautam 
Type: Update 
Category: SUS 
Subject: ETMX over the weekend 

Looking at the sensor and oplev trends over the weekend, there was only one event where the optic seems to have been macroscopically misaligned, at ~11:05:00 UTC on Oct 19 (early Saturday morning PDT). I attach a plot of the 2kHz time series data that has the mean value subtracted and a 0.6-1.2 Hz notch filter applied to remove the pendulum motion for better visualization. The y-axis calibration for the top plot assumes 1 ct ~= 1 um. This "glitch" seems to have a timescale of a few seconds, which is consistent with what we see on the CCD monitors when the cavity is locked - the alignment drifts away over a few seconds.

As usual, this tells us nothing conclusive. Anyways, I am re-enabling the watchdog and pushing on with locking activity and hope the suspension cooperates.


The satellite box was reconnected and the suspension was left with watchdog off but OSEM roughly centered. We will watch for glitches over the weekend.

Attachment 1: filteredData.pdf  187 kB  Uploaded Mon Oct 21 17:05:17 2019  | Hide | Hide all
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