By analyzing the data to understand the issue on HWS-DET(50508), we noticed that SDB1 TX and TY during the shift performed 19th Jan, changed wrt previous measurement performed during the shift of 18th Jan (see fig.1 ).

With the help of Romain we defined the SDB1 TX and SDB1 TY values to save in the configuration file (TX: -36 urad and TY:-705 urad, see entry 50522).

After that we disabled the B5 drift control and  started again the measurement with HWS-DET (we also asked to Diego to disable the re-engament of the drift control in the automation process to relock the arms).

The acquisition with HWS-DET started at 17.20 UTC, the RH was switched on at 17.30 UTC. 

The position of the HWS-DET beam on NI CP is now the same as during the shift of 18th Jan (see fig.2).

At this point we turned on the CO2 CH (20.18 UTC, power=1.3 W) and started the centering procedure. 

The NI-RH has been swtiched off at 23.34 UTC.

The NI-CH has been switched off at 23.33 UTC.