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I am now taking transfer functions of the MICH and PRCL loops to make sure that we have the gains about right.
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I have set the PRCL UGF to be about 180Hz, and the MICH UGF to be about 70 Hz.
This is with locking on REFL165 I&Q, with MICH gain of -2.0 and PRCL gain of 0.70 .
The PRCL loop only has about 30 degrees of phase margin, and is not near the top of its phase bubble. During the day, I need to look at why we don't have more phase near 200 Hz. |