Participants : 
M. Eisenmann, M. Otsuka, S. Singh, K. Somiya, K. Yamamoto

Agenda :

* New ITMs polishing update (M. Eisenmann)
  * Preparation of bidding for next step polishing on-going

 * Birefringence measurement update (S. Singh)
  * Analysis seems good; plan for 2D measurements + on-site measurement

 * Q measurement and simulation update (K. Yamamoto)
  * Yamada-san and Rishabh busy... K. Yamamoto can give updates in the meantime
  * dummy mirror suspension on-going from next month

 * Coating and U. Toyama activities (K. Yamamoto)
  * Coating mechanical loss at cryogenic temperature paper was accepted
  * McGhee (Glasgow) visit from end of March to July to measure amorphous Silicon coating mechanical loss at 100K
  * In future plan to exchange samples to compare GENS and nodal support techniques
  * Yu Sato will finish Master thesis about PI in Feb 2025
  * It  seems that mode shape depends on a-axis direction

 * PI simulation (M. Otsuka)
  * optical simulations on-going with goal of estimating modal content of coupled cavity

 * New AZTEC samples characterization + spectroscopy (M. Eisenmann)
  * Could estimate impact of impurities on 1064nm absorption and compare it with PCI absorption for few samples
  * Plan to do spectroscopy measurements with s-polarized light
  * Plan to have new holder to test new AZTEC samples

 * Possible crystalline materials conference? (M. Eisenmann)
  * Opening of Kakenhi for conference support
  * There are ASPIRE and bilateral calls aswell (K. Somiya)
  * There are interest but should further discuss to avoid competing with each others

 * Discussion
  * Thermal noise derived from new coating mechanical loss should become KAGRA official value
  * This new value was used by Komori-san in the 10 years sensitivity simulation