KAGRA Logbook

CAL (General)

hirotaka.yuzurihara - 8:36 Friday 14 June 2024 (29903)

TCam photo session 20240614

[Yokozawa, Yuzu]

I took the TCam photos at 08:10~08:18 this morning. The previous reference position was taken on 2023/07/24. But, the current mirror center position is not different significantly.

Tcam image for ITMX
Working memo
- We opened the Green shutter and requested the ALIGNED state to the VIS_PR3 duardian. Yokozawa-san adjusted the ETMX direction for the YAW direction manually, to prevent illuminating the ITMX by the returned green light. After finishing the photo session, we restored them to original states.
I haven't updated the reference values yet.

Comments to this report:

takaaki.yokozawa - 8:35 Friday 14 June 2024 (29904)

> Yokozawa-san adjusted the ETMX direction for the YAW direction manually.
Since the reflection beam from ETMX was touched the edge of the ITMX when we requested the MISALIGNED state of ETMX.
I temporally changed the TM set point from -11 to -61 and after finishing this work, I backed to -11.

At the same time, I noticed the GRX flash was weak when PR3,ITMX and ETMX were aligned state, I adjusted the pitch of the PR3
3.7 -> -12

hirotaka.yuzurihara - 8:40 Friday 14 June 2024 (29905)

We got the acceptance by Ushiba-san. We updated the reference mirror center for ITMX.

I redraw the tcam-graffiti for the screen in the control room.