Chat on simulations 2021/09/14

Participants: Haoyu Wang, Tomotada Akutsu, Yoichi Aso, Yuta Michimura, (Keiko Kokeyama)

Minutes

Decisions
- Increase the frequency of the simulation meeting to biweekly. Doodle the slot [Haoyu].
- Ask Haoyu and other simulators to join the commissioning(integration) meeting on Wednesday 11:00.
- Ask June Gyu the status of OMC model and may be ask him to join birefringence model development.
Current simulation activities
- GUI development by Koyama-kun. GUI will be useful for commissioners
- IFO model by Kokeyama-san for simulating sensing matrix etc. Haoyu will take over.
- OMC model by June Gyu to compare measured OMC scan results with the simulation. May be halted.
- Birefringence model by Haoyu. Currently constructing the model. Freq noise coupling etc will be calculated once ready.
Starting point of simulation useful for the site work.
- Try to reproduce directly reflected beam from ITM at POP. Dirty shape from birefringence or clipping?
  - BS s/p reflectivity unbalance and polarization rotation from periscope etc. would change the shape of s/p beam shape.
  - Comparing the simulation result with POP s-pol/p-pol camera image is a starting point.
- Big task will be to check ASC with birefringence included.
Commissioning meeting on Wednesday 11:00 is useful for communication between on-site people and off-site people.