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CAL (General)
takahiro.yamamoto - 17:18 Friday 14 February 2020 (12965) Print this report
Estimation of ETMX actuator efficiency
[Ogaki, Ushiba, Yamamoto]

We checked the actuator efficiency of ETMX by the height of calibration line from ETMX and ETMY.
- (DARM_DISPLACEMENT) / (ETMY_TM_SUMOUT_EXC) = (CAL filter) * A_ETMY * C / ( (1 + G_EX) * (1 + G_EY) ) = 3.83(4) x10^{-10}
- (DARM_DISPLACEMENT) / (ETMX_TM_SUMOUT_EXC) = (CAL filter) * A_ETMX * C / ( (1 + G_EX) * (1 + G_EY) ) = 1.81(3) x10^{-10}

- A_ETMX / A_ETMY = 0.471
Roughly a factor of two is difference between actuator efficiency (from count to meter) of ETMX and one of ETMY.

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wataru.ogaki - 17:44 Friday 14 February 2020 (12967) Print this report
We also estimated ETMX actuator efficiency from transfer function measurement.

- (DARM1_IN1) / (ETMY_ISCINF_L_EXC) = A_ETMY * C / ( (1 + G_EX) * (1 + G_EY) ) ... (1)
- (DARM1_IN1) / (ETMX_ISCINF_L_EXC) = A_ETMX * C / ( (1 + G_EX) * (1 + G_EY) ) ... (2)

- A_ETMX / A_ETMY = (2) / (1) ~ 0.479 +/- 0.006
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