ELOG - Y arm ALS noise budget

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Wed Jan 25 02:59:46 2012, kiwamu, Update, Green Locking, Y arm ALS noise budget

Message ID: 6221 Entry time: Wed Jan 25 02:59:46 2012 In reply to: 6220

Surprisingly increasing the gain of the whitening filter didn't improve the noise curve.

It suggests that the ADC noise is not the limiting factor below 10 Hz.

Quote from #6220

Though, it turned out that the MFD's ADC is now limiting the noise in a frequency band of 200 mHz - 5 Hz.

So tonight I will increase the gain of the whitening filter to push down the ADC noise more.