The following is a short calculation of the ITM lensing estimates for O1 for the recycling cavities based on the measurements from the HWS.
CO2power: [X = 0.225W, Y = 0.0W]
dS/dP_co2 = [+62E-5 D/W, ?? D/W]
Lens = [14.1E-6 D, 0 D]
Arm Power ~ 100kW
absorption: [X = 2.5E-7, Y = 2.8E-7]
SelfPower: [X = 0.025W, Y = 0.028W]
dS/dP_self = 4.87E-4 D/W
Lens = [12.2E-6 D, 13.6E-6 D]
Static Lenses = [-12E-6, +1.7E-6]
So net lenses are:
X = (14.1 + 12.2 -12) uD = 14.3 uD
Y = (0 + 13.6 + 1.7) uD = 15.3 uD
Common Lens = 14.8 uD (or 67.6 km equivalent)
Diff Lens = 1 uD