The AC responses of the BS, ITMs and PRM actuators have been calibrated.
(Background)
To perform some interferometric works such as #5582, the actuator responses must be measured.
(Results)
BS = 2.190e-08 / f2 [m/counts]
ITMX = 4.913e-09 / f2 [m/counts]
ITMY = 4.832e-09 / f2 [m/counts]
PRM = 2.022e-08 / f2 [m/counts]
(Measurement)
The same technique as I reported some times ago ( #4721) were used for measuring the BS and ITMs actuators.
In order to measure the PRM actuator, power-recycled ITMY (PR-ITMY) was locked and the same measurement was applied.
The sensor response of PR-ITMY was calibrated by exciting the ITMY actuator since the response of the ITMY had been already measured. |