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Entry  Tue May 15 22:11:38 2018, gautam, Update, General, IFO maintenance OL_RIN_2018_05_15.pdfOLsums.png
    Reply  Fri Jun 15 09:14:42 2018, Steve, Update, General, Oplev sums opSums.png
Message ID: 13847     Entry time: Tue May 15 22:11:38 2018     Reply to this: 13971
Author: gautam 
Type: Update 
Category: General 
Subject: IFO maintenance 

Since there have been various software/hardware activity going on (stack weighing, AUX laser PLL, computing timing errors etc etc), I decided to do a check on the state of the IFO.

  • c1susaux, c1aux and c1iscaux crates were keyed as they were un-telnet-able.
  • Single arm locking worked fine, TT alignment was tweaked (as these had drifted due to the ADC failure in c1lsc) to maximize Y arm transmission using the dither servos.
  • Arms weren't staying locked for extended periods of time. I particularly suspected ITMX, as I saw what I judged to be excess motion on the Oplev.
  • @Steve - ITMX and BS HeNes look like they are in need of replacement judging by the RIN (although the trend data doesn't show any precipitous drop in power). If we are replacing the BS/PRM Oplev HeNe, might be a good time to plan the inejction path a bit better on that table.
  • RIN in Attachment #1 has been normalized by the mean value of the OL sum channel. There is now a script to make this kind of plot from NDS in the scripts directory (as I found it confusing to apply different calibrations to individual traces in DTT).
Attachment 1: OL_RIN_2018_05_15.pdf  264 kB  Uploaded Tue May 15 23:16:43 2018  | Hide | Hide all
Attachment 2: OLsums.png  41 kB  Uploaded Wed May 16 00:22:41 2018  | Hide | Hide all
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