jeffrey.kissel@LIGO.ORG - posted 12:54, Friday 01 May 2015 - last comment - 13:25, Friday 01 May 2015(18141)
Hardware Injection and Calibration Tests Complete, IFO in LOWNOISE_ESD_ETMY Guard State
J. Kissel, M. Landry More detailed aLOGs to come, but for those watching we've now completed all the tests we plan to do today with hardware injections and calibration measurements as of ~19:45 UTC / ~12:46 PDT. The observation intent bit is on. For the record, the "nominal" guardian state is still set to be "LSC_FF," (STATE_N = 520) but we will *not* be going to that state for not, as we still believe the MICH and SRCL subtraction are unstable and/or cause non-gaussianity. Also the cut-off filters for the CHARD and DHARD ASC loops are not engaged (because those also have not been tuned for the new higher recycling gain). We are leaving it in this state (called LOWNOISE_ESD_ETMY, STATE_N = 515) for this lock stretch, even though guardian does not think it's "nominal." Thanks for your patience! For the record, the first part of this lock stretch was glitchy (as seen on the spectrum in the wall and in the time series of DARM control). We're not sure why, but we'd convinced ourselves that it did not directly correlate with our hardware injection tests. It would be interesting to know what the problem was,
Could the nominal state be temporarily changed to Low noise ESD ETMY (or whichever state the IFO is most likely to be in for the mini run)?
If the Guardian isn't reporting that it's in the nominal state, the science mode bit will remain off and downstream tools that we want to test won't automatically run.