[Hido, YamaT]

Abstract

We updated the calibration parameters on the front-end calibration based on the measurements in klog#29974 (MICH) and klog#30091 (PRX).
We also modified VERTEX guardian in order to switch calibration parameters automatically between 1f and 3f lock.
 

Details

Updates for MICH
Optical gain of MICH and actuator efficiency of BS are managed in FilterBanks named K1:CAL-CS_SUM_MICH_ERR and K1:CAL-CS_SUM_MICH_BS_TM, respectively. Because actuator efficiency is not changed by the configuration of IFO, it's set on FM1 with the same manner as before. On the other hand, optical gain must be changed by the configuration of IFO, we set parameter for 1f and 3f on FM2 and FM3, respectively. FM1 is reserved for the semi-auto calibration for the OBSERVING mode. Concrete changes are as follows.

Note that values in K1:CAL-CS_SUM_MICH_ERR_FM* are inverse of optical gains and actuator efficiency is a value for the susmod normalized at 1Hz.

Updates for PRX
For the PRCL, calibration parameters are managed in the same manner as MICH. Corresponding FilterBanks are K1:CAL-CS_SUM_PRCL_ERR and K1:CAL-CS_SUM_PRCL_PRM_TM. Exact changes are as follows.

Note that actuator efficiency is a value for the susmod normalized at 10Hz.

Automation of 1f, 3f switching
For serving correct displacement in both 1f lock and 3f lock, we modified VERTEX guardian in order to change calibration parameter automatically. It's implemented as the similar manner with the state control of each OPTIC (ALIGNED/MISALIGNED). Switching filter is done in PREP_FM_FOR_MICH state based on the REQUESTED state. When MICH_1F_LOCKED or MICH_LOCKED is requested MICH parameter is changed to 1f value. On the other hand, MICH_3F_LOCKED is requested, 3f value is set. In the PRX case, guardian shows same behavior. So 1f value and 3f value is set when PRX_1F_LOCKED and PRX_3F_LOCKED is requested, respectively.