Reports until 14:56, Wednesday 04 May 2016
H1 SUS
betsy.weaver@LIGO.ORG - posted 14:56, Wednesday 04 May 2016 - last comment - 16:18, Wednesday 04 May 2016(27007)
~Weekly ETM charge trends updated

Today, we were able to take the charge measurements on both ETMX and ETMY SUSes.  Someone musta started jumping around part way through the ETMX ones because the error bar is much larger on today's data points and a few of the points were omitted altogether because they just didn't have any coherence.  Recall the sign was flipped last week so we've had 1 week of "charge turnover" which is starting to show in the attached long trends.

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jeffrey.kissel@LIGO.ORG - 16:18, Wednesday 04 May 2016 (27012)CDS, VE
J. Kissel, P. Thomas, K. Ryan

Patrick informed me that Kyle had accidentally powered down the new EX Vacuum Computer (h0veex), which is *now* what is in charge of the vacuum gauge responsible for the electrostatic drive system's vacuum interlock (it used to be monitored via the ISC end-station beckhoff system). Upon power down, this "trips" the interlock, shutting down the high-voltage power supplies for the ESD system. That's why Betsy's measurements turned to junk halfway through. 

Thankfully this interlock has never tripped because of a vacuum incident, but it has certainly cried wolf at least 50 or more times since its inception. Perhaps we should consider making it capable of handling computer outages and/or make it an entirely analog system.