Sheila, Evan

Evan struggled with the PSL tripping earlier tonight.  After it stopped tripping we were able to lock long enough to get to low noise and make one DARM OLG measurement, which is attached here. Then we were hit by a large earthquake. 

I made an attempt at making a filter for SRCL FF, using alpha to go the the DARM actuator  For the SRCL OUT to DARM IN tf we used the noise injection from last night, screen shot of the TF is attached.  

To get alpha, I took SRCLOUT-> DARM IN tf *(DARM OLG/(DARM Closed loop*DARM plant) which is (DARM IN1/SRCL OUT)*(DARM IN1/DARM IN2)/((DARM IN1/DARM EXC)*(DARM IN1/DARM OUT)).  for the DARM measurements I used a cut of 0.6 on the product of all three coherences, from SRCL to DARM we have  I used a cut of 0.8 on coherence.  I fit the product using vecfit, the attached screenshot shows the result when using 8 zeros and 8 poles, anyone can adjust the number of zp pairs by editing line 58 in /sheila.dwyer/Noise/SRCLMICHFF/SRCL_DARM_TF.m.  I did not load any filters.