jeffrey.kissel@LIGO.ORG - posted 12:55, Monday 08 May 2023 - last comment - 13:17, Monday 08 May 2023(69413)
CAL_AWG_LINES Test Point Kill left Thermalization Lines OFF This Weekend
J. Kissel In hopes that we would have a few thermalization periods measured over the weekend in our new SRCL offset at -265 (LHO:69359) and our new DARM offset set such that there's 40 mA total of photocurrent on the DCPDs (H1:OMC-READOUT_X0_OFFSET ~= 9.7, see LHO:69358), I went to run Evan's thermalization script (LHO:69301) ... but came up with noise only for the PCALY 8.925, 11.575, 15.275, 24.5 Hz lines driven by CAL_AWG_LINES. Sadly, it looks like the PCAL model's test points (FEC DCUID 125) were cleared on 2023-05-06 15:57 UTC, or (Saturday morning at 08:57 PDT), and they've not been restored. I think this might have resulted in some confusion regarding instructions on how to run calibration measurements headlessly, in that the test points were cleared even though the headless measurement succeeded normally without the IFO losing lock. (LHO:69396). I've edited the wiki page instructions to be more clear. I'll get lines restarted ASAP so we can catch the next lock acquisition.
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The cycle of the ISC_LOCK guardian from NOMINAL_LOW_NOISE to NLN_CAL_MEAS, then from NLN_CAL_MEAS back to NOMINAL_LOW_NOISE after the successful completion of this morning's calibration suite, LHO:69396 restored the these CAL_AWG_LINES thermalization lines, since that process requests CAL_AWG_LINES to go to LINES_OFF, then LINES_ON -- rekindling the excitation test point. So, they're back ON as of 2023-05-08 19:34 UTC.