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Message ID: 1415
Entry time: Sun Mar 22 22:39:24 2009
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| Author: |
rana |
| Type: |
Summary |
| Category: |
LSC |
| Subject: |
Calibration of the ITM and ETM Actuation |
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I used the following procedure to calibrate the ITMX actuation signal.
Free Swinging Michelson:
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- 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:
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- 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:
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- Lock a single arm
- Sweep ITM & ETM.
- Then sweep MC2 and record drive signal from MC board to the VCO driver.
- Compare and contrast. |
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