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Entry  Thu Oct 8 20:18:56 2009, Koji, Summary, General, Arm cavity loss 
    Reply  Thu Oct 8 21:32:59 2009, Koji, Summary, General, Recycling cavity loss 
Message ID: 2070     Entry time: Thu Oct 8 20:18:56 2009     Reply to this: 2071
Author: Koji 
Type: Summary 
Category: General 
Subject: Arm cavity loss 

Last night (Oct 07), I ran armLoss script in order to obtain the latest numbers for the arm cavity loss.
Here is the summary

<<X arm>>
Measured arm reflectivity R_cav:
0.875 +/- 0.005
Estimated round trip loss L_RT: 157ppm +/- 8ppm
Estimated finesse F: 1213+/-2
Data Points: 34

<<Y arm>>
Measured arm reflectivity R_cav:
0.869 +/- 0.006
Estimated round trip loss L_RT: 166ppm +/- 8ppm
Estimated finesse F: 1211+/-2
Data Points: 26








TE=10ppm, LE=L_RT/2, RE=1-TE-LE
tE=Sqrt(TE), rE=Sqrt(RE)

TF=0.005, LF=L_RT/2, RF=1-TF-LF
tF=Sqrt(TF), rF=Sqrt(RF)

rcav = -rF +(tF^2 rE)/(1-rF rE)
R_cav = rcav^2

F = pi Sqrt(rF rE)/(1-rF rE)


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