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Message ID: 18
Entry time: Fri Oct 26 16:19:29 2007
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| Author: |
Tobin Fricke |
| Type: |
Routine |
| Category: |
IOO |
| Subject: |
MC resonances |
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We would like to measure the absorption of the mode cleaner optics. The plan is to repeat <a href="http://ilog.ligo-wa.caltech.edu:7285/mLIGO/Cleaning_the_Mode_Cleaner">Valera's experiment</a> in which we track the MC's thermal resonances to infer their power absorption. Last night Rana and I hooked up a lock-in amplifier to heterodyne the MC servo signal by 28 kHz and piped the output into an ADC using the MC_AO channel. We did not find any resonances.
Valera recommends we drive the POS of the three MC optics with bandlimited noise to excite the resonances. |