= Simulation Summary (so-far) Meeting =
2020 Nov 11, 3pm - 5pm, zoom2
 
== Guest ==
Hiro Yamamoto Sensei

== Participants ==
Kokeyama, Hirose, Wang, YamamotoH, Leonaridi, Koyama, Oshino, Akutus, Michimura, Yuzurihara, Somiya, Miyakawa, Oshino

== Agenda ==

|| Topic || Speaker || Slide Link || Dur ||
|| Finesse IFO model || Kokeyama || [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12225|o]]|| 5 mins ||
|| OMC model || Park || || 5 mins ||
|| Finesse GUI || Koyama, Hirose ||  [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12227|GUI]][[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12226|cross check]]|| 10 mins ||
|| Birefringence || Wang || [[ https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12222|link]] || 10 mins ||

 * We will have free discussion time after each talk, which is not shown in the table
 
== Minues ==

=== OMC ===
 * Wedge angles of OMC1, OMC2 matters?
 * Should we include the thickness (and wedge) of OMC1? (Somiya-san) Gouy phase difference between V and H is <1 deg, which should be negligible.
 * (Hiro-san)The slope (from HOM 0 -8 of the experiment) maybe reflecting the spatial abbreviation of the test masses having longer wavelength more than short wavelength
 * (Akutsu-san) Aso-san’s document: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10527|this]]. The current OMC is base on the **-R500.*** files. It is nice to confirm it with him! In my memo, with this document, I did double-checking of the Aso-san’s ray-trace with another commercial simulator.

=== GUI ===
 * The windows installation procedure is ready
 * (Hiro-san) Can you add mirrors? - No
 * We can expand the configuration, such as OMC and IMC.
 * (Akutsu-san) Can you change macroscopic lengths? - Yes
 
=== Birefringence ===
 * Mach-Zhender model to simulate S->S, S->P, P->S, P->P conversion.
 * The intuitive understanding of this model is to convert S-P basis to e-o basis (extraordinary and ordinary axes) by the first BS, and covert back to S-P by the second BS.
 * Are the phi maps really correct
 * We need alpha_{-} map for the simulation 
   * We look for measurement data with circular polarization (P.6 of Haoyou's slide)
   * Is phi and alpha_{-} related?
 * [[https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0110/G1911070/002/Polarization%20and%20Absorption%20Maps_f2f201912.pdf|This]] measurement shows only a few degree birefringence (sample sapphire, NAOJ measurement) whereas our phi map is -40~40 degrees.
 * [[https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.14.014021|Hirose-san paper]] (showing the measurement method)
 * Maybe we can have a small meeting with Matteo nad Aso-san for their help?