In-vac PD/QPD layout meeting 2024/12/23
Time: Nov 20, 2024 10:00-10:30
Participants: Ray-Kuang Lee, Huali Chen, Yoichi Aso, Yuta Michimura
Zoom meeting
Minutes
- Huali showed the layout idea for AS RF.
Enclosure size for RF QPDs were different. Needs to be updated. RF QPD enclosure size is in LIGO-D1102002.
- Need to include OMC REFL RF QPDs as well.
- In our case, we don't need to care about the Gouy phase separation between steering mirrors
- Beam height
- RF QPD height is 4 inch, but the beam height in the OMC chamber is 210 mm.
See JGW-D1909819
- Put a periscope to lower the beam height?
- RF QPD height is 4 inch, but the beam height in the OMC chamber is 210 mm.
- Put optics on a breadboard to make maintenance/test easier (make it easier to remove and re-install OSTM)
- Do we also need to have QPDs on the breadboard or not?
- If QPDs are on the breadboard, we also have to remove the cables for QPDs when moving the breadboard.
- Steering mirrors for RF QPDs: One PZT and one picomotor for QPD centering needed
A/I
- Update the layout to include OMC REFL RF QPDs [Huali]
- Send Huali the part numbers for in-vac steering mirror mounts [Yuta]
2-inch ones in OMC chamber are Sigma-Koki VMHG-50.8. See, also JGW-D1503916
Update JGW-T2416178. OMC REFL QPD should be RF, not DC. [Yuta]
- DONE on Jan 7, 2025
- Next meeting: in the week of Jan 20, 2025
- Decided to Jan 23, 2025 14:00-15:00 (JST)