- Participants :
T. Akutsu, Y. Aso, M. Eisenmann, S. Lee, M. Otsuka, H. Saint-Olive, S. Singh, K. Yamamoto
- Topics :
- New ITMs :
- Okamoto will grind the chirp close to AR side during ~ 1 month
- Nikon will spend 2 weeks/surface to pre-polish each surface to remove scratches
- overall 10 weeks delay expected (now waiting for quotation) but should be fine with respect to LMA schedule for coating
- Birefringence measurement :
- can use pair of LCs to measure Jones matrix, diattenuation and birefringence of samples in transmission and reflection
- now checking long term stability and improvement of uncertainty
- is it interesting to measure KAGRA BS properties? if so do we have witness sample?
- 10years plan :
- iLM/LMA can grow 30cm diameter sapphire with some(?) down to 20-30ppm/cm absorption. They are now trying to reduce birefringence
- Jerome Degallaix (LMA) will be invited at an upcomming meeting
- AZTEC CEO changed and Mr. Hong who grown our substrates is creating his own start-up. Sungho purchase 30mm and 60mm new samples from AZTEC to be characterized.
- PI simulations
- Otsuka plans to study PI and their mitigation for KAGRA
- Kaihotsu and Kaido thesis presents such investigation : worth trying to repeat this simulation with bonding layers and different aspect-ratios?
- next meeting :
- Switch to 2 meetings/month
- next meeting on June 19th
- New ITMs :