Virgo Logbook

To prepare for the future implementation of servos to stabilize the etalons, we added some code to Alp_TCS that reads the temperatures calculated by Michele's line monitor from file and stores them in the DAQ, see fig 1. The new channel names are Alp_TCS_NI_Mirror_Temp and Alp_TCS_WI_Mirror_Temp. If the last calculation is too old (when the ITF is not locked), Alp_TCS_Mirror_Temp_Valid is set to zero.

We also corrected a bug in the temperature stabilization loop of the WI, which was already corrected for the NI in October. The new set-point for the chiller was calculated as New_Chiller_Setpoint = Old_Chiller_Temperature + correction, while it should be New_Chiller_Setpoint = Old_Chiller_SetPoint + correction. Also the gain of the loop was increased, like was done for the NI. The accuracy of this loop is now similar the one of the NI, see fig 2.