I looked at the data of the day before yesterday (Oct 06) to know how much is the recycling gain.
X arm: (TRX_PRecycled) / (TRX_PRMmisaligned) * T_PRM = 83.1/0.943*0.07 = 6.17
Y arm: (TRX_PRecycled) / (TRX_PRMmisaligned) * T_PRM = 99.2/1.017*0.07 = 6.83
==> G_PR = 6.5 +/- 0.5 (oh...this estimation is so bad...)
From the recycling gain and the arm cavity reflectance, one can get the loss in the recycling cavity.
G_PR = T_PRM / (1-Sqrt(R_PRM * (1-L_PRC)*R_cav))^2
==> loss in the recycling cavity L_PRC: 0.009+/-0.009
(About 1% loss is likely in the recycling cavity)
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<<X arm>>
Measured arm reflectivity R_cav: 0.875 +/- 0.005
Estimated round trip loss L_RT: 157ppm +/- 8ppm
Estimated finesse F: 1213+/-2
<<Y arm>>
Measured arm reflectivity R_cav: 0.869 +/- 0.006
Estimated round trip loss L_RT: 166ppm +/- 8ppm
Estimated finesse F: 1211+/-2
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