Reports until 14:32, Friday 16 March 2018
H1 TCS (TCS)
cheryl.vorvick@LIGO.ORG - posted 14:32, Friday 16 March 2018 (41039)
TCS glitches - 3 varieties identified
  1. original glitch, shown in alog 40965, now showing both TCSY and TCSX
    •   this shows that where the TCSY laser temperature, chiller flow, and QPD B seg4 all glitched, nothing is seen on TCSX signals
    • all 3 signals from TCSY glitch independently of TCSX
  2. new glitch
    • both TCSY and TCSX QPD B seg4's gltich, but no other signals do
    • TCSY and TCSX QPDs glitch at the same time
  3. new glitch
    • both TCSY and TCSX QPD B seg4's gltich, and at the same time both laser temperatures start a slow rise in value, right before TCSX laser is turned on
    • this variety may have been due to preparations for turning the TCSX laser on, however, if that's true, it's significant that both TCSX and TCSY signals were effected
    • TCSY and TCSX QPDs and laser temperatures glitch at the same time

From these plots, I would say that it's very possible that there are multiple sources of glitching in the TCS system.

Images attached to this report