After the PR3 alignment using GRX, we succeeded to lock the PRFPMI.
(But maybe due to the not good alignment of GRX, we waited ~20 min to lock the ALS DARM)(Fig.1.)
When we finished the moving the PR3 with script, the GRX trans power suddenly became lower.(Fig.2.)
I think GRX cavity became higher mode, but to be a stable operation, it is better to tell to commissioner about this phenomena.
Are these dropped values used for judging that the GRX trans is less than the threshold value or not to instruct operators to perform PR3 alignment after the PRFPMI becomes down?
Current script for PR3 alignment check is working as follows:
GRX < 0.1: GRX doesn't seem to be locked correctly. So, PR3 alignment cannot be judged.
0.1<= GRX < 0.27: PR3 alignment is necessary.
0.27 <= GRX: PR3 alignment is not necessary.
I'm not so sure this threshould can avoid unnecessary PR3 alignment procedure but let's see what happens.