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Shingo Hido - 17:41 Tuesday 25 June 2024 (30107) Print this report
Comment to Estimation of actuator efficiency of PR2/PR3/PRM with PRX1F and optical gain of PRX (30091)

Hido

Abstract
I performed a cross-check.
All values are consisitent within error.

Details
1. Actuator efficiency of PRs
By taking PRs/ITMX * H_itmxtm, I estimated actuator efficiencies of PRs.
H_itmxtm has already been estimated at klog#30083
H_itmxtm = 2.904e-12 +/- 0.024e-12 [m/ct] at 1 Hz.
Fig. 1, 2, and 3 show the ratio of PRs to imtx, resulting in the following:
PRM/ITMX = -255.2 +/- 1.7,
PR2/ITMX = -513.0 +/- 3.3,
PR3/ITMX = -439.8 +/- 2.9.


So actuator efficiencse of PRs as below:
H_prmtm = -7.401e-12 +/- 0.0778e-12 [m/ct] at 10 Hz
H_pr2tm  = -1.450e-11 +/- 0.016e-13 [m/ct] at 10 Hz
H_pr3tm  = -1.277e-11 +/- 0.013e-13 [m/ct] at 10 Hz

2. Optical gain of PRX
Having determined the efficiency of PRM, I conducted fitting based on the model and measured OLTFs to estimate the optical gain in 1f and 3f.
Fig. 4, 5, 6 and 7 show model + fitting resluts, the OLTFs and their residuals.
H_prx3f = 1.352e+09 +/- 0.002e+09 [ct/m]
H_prx1f = 6.948e+08 +/- 0.007e+08 [ct/m]
The above error only takes into account the fitting error, the next step is to take into account the PRM measurement error and recalculate them.

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