[M. Wade, A. Viets]

I restarted the primary and redundant calibration pipelines on DMT0 and DMT2 at roughly GPS second 1223179096. This restart was necessary because of a change in channel names in the raw frames. The EPICS channels (which contain reference values needed to compute time-dependent correction factors) were renamed.

In order for data flow to be restored, the LHO_DMTDQ process needs to be restarted as well. None of the the kappas are being computed, so these channels which are usually present are not there:

• GDS-CALIB_KAPPA_TST_REAL
• GDS-CALIB_KAPPA_TST_IMAGINARY
• GDS-CALIB_KAPPA_TST_REAL_NOGATE
• GDS-CALIB_KAPPA_TST_IMAGINARY_NOGATE
• GDS-CALIB_KAPPA_PU_REAL
• GDS-CALIB_KAPPA_PU_IMAGINARY
• GDS-CALIB_KAPPA_PU_REAL_NOGATE
• GDS-CALIB_KAPPA_PU_IMAGINARY_NOGATE
• GDS-CALIB_KAPPA_C
• GDS-CALIB_KAPPA_C_NOGATE
• GDS-CALIB_F_CC
• GDS-CALIB_F_CC_NOGATE
• GDS-CALIB_F_S
• GDS-CALIB_F_S_NOGATE
• GDS-CALIB_SRC_Q_INVERSE
• GDS-CALIB_SRC_Q_INVERSE_NOGATE

For now, it is not possible to compute the time-dependent correction factors (kappas), so the pipeline was restarted with the calculations turned off. A few updates will be necessary in order to resume calculating the kappas:

• The new channel names need to be added to the low latency raw frames.
• The software on the production DMTs needs to be updated to gstlal-calibration-1.2.1, after testing of the software on the testing DMT is complete.
• The new calibration line frequencies need to be chosen and the lines turned on.