Reports until 13:28, Thursday 09 January 2020
H1 GRD (ISC, OpsInfo, SUS)
jeffrey.kissel@LIGO.ORG - posted 13:28, Thursday 09 January 2020 (54393)
Unmonitored TMS SDF TEST OFFSETS
S. Dwyer, J. Driggers, J. Kissel, T. Shaffer

We resolved why we've been "having" to recently offload the TMS TEST P and Y offset value (which is currently used for MISALIGNMENT offsets in the SUS gaurdian, INCREASES_FLASHES of the ALS gaurdians, and MOVE_SPOTS in the ISC_LOCK guardian) to the OPTICALIGN offsets upon the arrival in to NOMINAL_LOW_NOISE: (a) you don't *want* to do this offloading [I, Jeff, suggested we needed to do this in error], (b) these TEST offsets get used by enough guardians that we should just un-monitor them in the SDF system.

We've confirmed that the *important* values of these offsets (i.e. the ones that must remain static and don't change between lock stretches) -- the MISALIGNMENT offsets -- are stored in the lsc_params file and forced in place in the DOWN state (and the INCREASES_FLASHES state restores the values it started with).


Thus, there should now longer be anything showing up as an SDF DIFF upon arrival in to nominal low noise.