= MIR Meeting on 2023/07/05 15:00 - 16:00 =
Participants: KYamamoto, June-Gyu, Marc, Sungho, Aso, Matteo

=== Next meeting ===
2023 Aug 2nd, 15:00 - 16:00 

== Minutes ==
 1. Paper on coating (Mori, Nakayama, KYamamoto): Ti doped (LIGO) and undoped (KAGRA) SiO2-Tantala stacks
  * coating thermal noise seems higher than expected value
  * internal review by coauthors being done at the moment
  * will be circulated to MIR subgroup in the next weeks
 1. Planned presentation of the measurements contained in the paper at the next LVK
 1. Measurement of Q-value for KAGRA sapphire mirrors
  * CARM-DARM as readout sensors, magnets as actuators
  * T= 80K for ETMX and T=250K for all the others
  * all Q value are between 1e4 to 1e5, seems low compared to expected value of 1e8
  * investigation of the reason of low Q ongoing, dissipation source is not clear
  * offline test on spare ETMs could be done to investigate the source of dissipation (Aso)
 1. report on polishing of new ITMs by Aso
  * Shaping, lateral flats and barrel done by ARD
  * pre-polishing and wedge will be done by Okamoto Optics (test polishing done successfully)
  * lead time of pre-polishing is largely increased due to necessity to avoid subsurface damage 
  * no issue due to delay of pre-polishing since LMA is busy until the end of O4 on A+ coating
  * final polishing planned to start in march 2024 and last 12 months
 1. paper plan
  * commissioning paper on birefringence was merged with O3GK paper
  * birefr. exp setup + birefr. to internal stress paper under review
  * idea to merge simulation paper (by Haoyu) and methodology paper (by Aso) -> potentially almost ready (iPWT: Haoyu-Aso)
  * idea to have a paper on Aztec crystal characterization (iPWT: Marc-June Gyu)
  * idea to have a paper on eterodine AA with birefringence (iPWT: Marc-Haoyu)
 1. report on spectrophotometry measurement by Marc
  * calibration is ongoing, spectral shape as expected
 1. report on liquid crystals by Marc


== Agenda ==
 * Coating and Q-measurement update from KYamamoto
 * Polishing update from Aso
 * MIR related paper plan discussion