ELOG - MI locking : calibration of BS and ITMs actuators

40m Log

Not logged in

List | Find | Login | Help

Thu May 5 14:40:14 2011, Koji, Update, LSC, MI locking : calibration of BS and ITMs actuators

Message ID: 4639 Entry time: Thu May 5 14:40:14 2011 In reply to: 4638 Reply to this: 4643

Author:	Koji
Type:	Update
Category:	LSC
Subject:	MI locking : calibration of BS and ITMs actuators

I've got confused

1) Are these the DC responses of the coils? If that is true, we need to specify the resonant frequency of each suspension to get the AC response.

2) Are these the AC responses well above the resonant freqs? In that case, The responses should be x.xxx / f^2 [m/counts]

Quote:

The open loop transfer functions of the Michelson locking have been measured.

The purpose of this excise is to calibrate the coil-magnet actuators on BS and ITMs.

The estimated actuation coefficients are :

BS = 3.69e-08 [m/counts] ITMX = 8.89e-09 [m/counts] ITMY = 9.22e-09 [m/counts]