= Optical Table Cover for TMS and IMC Review on 2021/04/12 13:00 - 14:00 =
Participants: Koji Nagano, Shinji Miyoki, Tomotada Akutsu, Osamu Miyakawa, Takashi Uchiyama, Nobuhiro Kimura, Kenta Tanaka, Yuta Michimura

Zoom meeting: https://zoom.us/j/5045179604

== Materials ==
 * TRX and TRY Optical Table Cover Drawings: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12755
 * TRX and TRY Conceptual Design: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12600
 * IMC Optical Table Cover Drawings: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12754
 * IMC Conceptual Design: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12603

 * [Reference] REFL, POP, POS, AS Optical Table Cover Drawings: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10377

== Minutes ==
 * What is the purpose?
  * Light shielding to block ambient light to PDs and QPDs (also to block ambient light going into the chambers)
  * Dust cover to keep optical table clean
  * To block laser beams going outside for safety reasons
  * To protect periscopes and other optics (and viewports) from being touched unintentionally
  * See https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10129
 * Anything burnable? Especially for IMC, 100 W-class beam can come out from the chamber
  * '''A/I''': Check the material of rubbers, material of the aluminum panel surface [Michimura]
 * Anything that create heat inside the covers?
  * Beam dumps. IMC REFL has water-cooled beam dump to attenuate the beam. REFL not yet.
  * Heat generated by other circuits should be negligible.
 * Which sides have doors?
  * Three sides, except for the side close to vacuum chamber.
 * When should be assemble them?
  * IMC REFL/IMC TRANS: After mid-June, when IMC commissioning finishes
  * TRX/TRY: After July, since we might shoot green beam in June
  * AS: We will not use AS for a while
  * '''Decision''': Order first and discuss the assembly schedule when the parts are ready
 * How to proceed with the ordering?
  * '''A/I''': Check with Kikuchi-san [Michiumura]