jeffrey.kissel@LIGO.ORG - posted 14:58, Friday 08 June 2018 - last comment - 08:59, Monday 11 June 2018(42405)
HAM6 ISI Displacement Performance Terrible Below 0.2 Hz Since June 1
J. Kissel, H. Radkins Something appears to have gone terribly wrong after Friday Jun 1 with the ISI HAM6 performance below ~0.2 Hz. Given that frequency range, first suspects are CPS and Sensor Correction. More likely to be CPS, given Hugh's battle with them during the vent (see e.g. LHO aLOG 41204). I've informed Hugh and will file an FRS ticket. Attached plots stolen from the summary pages show the performance of the table on Jun 1, Jun 2, and today (Jun 8) 2018.
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Not a surprise, but just confirming corner 3 of HAM6 CPS noise is very hig, see first plot attached.
The DC level changed on June 1st at 15:30 UTC (08:30 am local), and the noise went up starting June 5 at around 02:20 UTC (19:20 local), see second plot.
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Doing a quick search, it doesn't look like the CPS weekly was done last week. That would have picked this up easily.
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