Abstract:

I roughly centered the IR beam on OMMT2 trans QPDs by moving OMMT1.
The alignment doesn't seem to change so much.

Detail:

After GV between SR3 and SRM was opened, I tried to find the IR beam on OMMT2 trans QPDs.
Procedure is as follows.
1. XARM alignment with INITIAL_ALIGNMENT gurdian.
2. YARM alignment wit INITIAL_ALIGNMENT guardian.
3. Change PRM state to MISALIGNED_BF for increasing laser power.
4. Close GRX and GRY shutter.
5. Tweaking OMMT1 angle with coil-magnet actuators to find the beam on OMMT2 trans QPD.
6. Change OSTM state to MISALIGNED_FOR_LOCK_ACQ to avoid unnecessary flash of OMC.
7. Increase laser power for checking if the obtained beam on QPD is really IR beam.

The beam was found and I moved the OMMT1 OPTICALIGN offset for pitch and yaw from -4575 and -1842 to -25000 and -3700 cnts, respectively.
Figure 1 shows the QPD SUM, PIT, YAW, and IMC output.
 The QPD SUM is increasing as IMC output is increasing while pitch and yaw values are kept around zeros.
So, IR beam should be almost center on the OMMT2 trans QPD now.

Since the beam can be found by moving OMMT1 with just coil magnet actuators, the alignment to OMMT1 should not be moved so much.