ELOG - ALS noise budget update - Updated AUX PDH Loop values

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Sat Sep 19 23:59:22 2020, anchal, Summary, ALS, ALS noise budget update

Sun Sep 20 23:12:13 2020, rana, Summary, ALS, ALS noise budget update

Tue Sep 22 00:14:43 2020, anchal, Summary, ALS, ALS noise budget update

Tue Sep 22 12:14:42 2020, rana, Summary, ALS, ALS noise budget update

Wed Sep 23 11:13:49 2020, anchal, Summary, ALS, ALS noise budget update

Wed Oct 7 16:56:23 2020, anchal, Summary, ALS, ALS noise budget update - Updated AUX PDH Loop values

Thu Oct 8 11:59:52 2020, rana, Summary, ALS, ALS noise budget update - Updated AUX PDH Loop values

Fri Oct 9 18:32:14 2020, anchal, Summary, ALS, ALS noise budget update - Updated AUX PDH Loop values

Wed Oct 14 17:03:55 2020, anchal, Summary, ALS, ALS noise budget update - Added whitening filter for ADC

Message ID: 15619 Entry time: Thu Oct 8 11:59:52 2020 In reply to: 15617 Reply to this: 15622

Author:	rana
Type:	Summary
Category:	ALS
Subject:	ALS noise budget update - Updated AUX PDH Loop values

For all the loops where we drive the NPRO PZT, there is some notch/resonance feature due to the PZT mechanical resonance. In the IMC loop this limits the PZT/EOM crossove to be less than 25 kHz. I don't have a model for this, btu it should be included.

If you hunt through the elogs, people have measured the TF of ALS NPRO PZT to phase/frequency. Probably there's also a measured ALS PDH loop somewhere that you could use to verify your model.

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