Date: 2024/3/12

With ShingoFujii

Abstract

• Adjusted TM position information in CAL script.
• Adjusted Pcal beam positions on ETM by using the picomotors in EXA chamber. And adjusted a little in Rx module.
• Then we could get the both Pcal beams in RxPD.
• The total optical efficiency from TxPD values to Rx value with a quick measurement was 95%, which is similler to the values in O4a (96% for path 1, and 95% for path 2)

Details

1. Used an LED light to lighting ETM from EXA chamber.
2. Took Tcam pictures to adjuste the ETM position on the picture. (fig1)
3. Block path 2 and pass path 1 to start adjustment of the path 1.
   1. Used picomotors on the mirror in EXA chamber to adjust the beam position on ETM. => After this work, we could see the beam in Rx module.
4. Block path 1 and pass path 2 to start adjustment of the path 2.
   1. Used picomotors on the mirror in EXA chamber to adjust the beam position on ETM. => After this work, we could see the beam in Rx module.
5. Pass both paths, and perfomered fine adjustment of the beam positions on ETM. (fig 2) => After this work, both beams were on the RxPD port without any other alignment adjustment.
6. Adjusted a little alignment for the mirrors in Rx module to make both beams on the center of the RxPD port.(fig 3)