= In-vac PD/QPD layout meeting 2025/11/26 =
Time: 14:00-14:30

Participants: Huali Chen, Ryan Yang, Ray-Kuang Lee, Yoichi Aso, Yuta Michimura

Zoom meeting

== Minutes ==
 * POP design (Ryan)
  * POP in-vac/in-air design completed
  * POP Forward in-air design needs to be updated to use DC QPD instead of RF QPD.
   * Lenses for POP forward beam can be found here: https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0096/T1909623/009/20220407_KAGRA_POP.svg
  * Green X design needs to be updated to avoid conflict between the chamber
   * Lens information needed

 * In-vac periscope (Ryan)
  * New design following [[https://dcc.ligo.org/LIGO-D1002350|LIGO-D1002350]] is ongoing.
  * The top mirror height is 200 mm, and the lower mirror height will be 4 inch - 15 mm.
  * Mirror holder

 * '''A/I'''
  * Consult with VAC people to start designing REFL/POP PD tank [Yuta]
  * Send Ryan information on lenses for the POP table [Yuta]
  * Design a new periscope with 2 inch mirrors fixed on plates (not mirror mounts) on a rectangular structure. [Ryan]
   * Upload the current version for comments [Ryan]
   * Check the resonant frequencies with FEM [Ryan]
   * Re-adjust the OMC chamber layout based on the new periscope design [Ryan]
   * Get a quote [Ryan]
  * Design a base plate for OMC chamber
  * What to do with a beam diverter? 
 * Next meeting: TBD