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Message ID: 1415     Entry time: Sun Mar 22 22:39:24 2009
Author: rana 
Type: Summary 
Category: LSC 
Subject: Calibration of the ITM and ETM Actuation 
I used the following procedure to calibrate the ITMX actuation signal.

Free Swinging Michelson:
- Restore Michelson
- Align Michelson: Minimize AS_DC (PD3_DC_OUT) by tweaking BS alignment.
- Enable Whitening filters for PD1_Q and PD3_DC.
- Run offsets script to get rid of DC and RF offsets.
- Use DTT Triggered Time Series to get time series and measure peak-peak
amplitude of PD1_Q using DTT horizontal cursors. (Templates/Calibration/090322/FreeSwing.xml)

Michelson Sweeps:
- Lock Michelson
- Drive ITMX_LSC_EXC using ITMX-MI-Sweep.xml template.
- (Next time remember to turn on a low pass in the MICH loop so that its an open loop measurement below 50 Hz).
- Fit and so some math.

Arm Sweeps for the ETMs:
- Lock a single arm
- Sweep ITM & ETM.
- Then sweep MC2 and record drive signal from MC board to the VCO driver.
- Compare and contrast.
Attachment 1: free.png  33 kB  Uploaded Sun Mar 22 23:59:02 2009  | Hide | Hide all
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