After the start of pumping EXC area klog29143, it looks the Pcal-X beams moved...
We need to adjust them later.
I adjusted the beam positions with the picos in EXA chamber = "PCAL_EX2"
The current pressure in EXA is about 70Pa.
The displacement moved by the vacuum pumping this time was roughly the same as the last time: klog19315
We need a fine adjustment when we can request ALIGNED state to the ETMX suspension.
With Hido Shingo
We performed the fine adjustment for the Pcal-X alignment with the ALIGNED state of the ETMX suspension.
We used PCAL_EX1(in Tx module) and PCAL_EX2(in EXA chamber) picomotors to adjust the path 1 so that the paths passed through the design position on the ETM and the center of the RxPD.
We left the Pcal-X laser ON, and the Pcal-X guardian state at OFS_CLOSED_LOW_POWER.
Attached files are showing beam positions on ETM and RxPD.
The total picomotor steps we requested are:
- PCAL_EX1, pico 2 (path 1 yaw): -550
- PCAL_EX2, pico 1(path 1 yaw): -600
- PCAL_EX2, pico 2(path 1 pitch): +400
- PCAL_EX2, pico 3(path 2 yaw): +100
- PCAL_EX2, pico 4(path 2 pitch): +300
The final optical efficiencies were (quick measurement):
- Path 1: 97.0%
- Path 2: 96.5%
- Path 1+2: 96.7%
These are similar to klog28820.
