Designed new filters for compensating the ITM PUM->TST P2P and Y2Y drive path.

- There filters were originally designed starting with Jeff's suspension model. They were then tested and fine-tuned using an optical lever feed-back.
- They include inversions of the two suspension poles - slightly offset in frequency to guarantee stability.
- They also have a notch to kill a rung-up suspension modes a 3.1Hz and 3.3Hz. That will prevent high BW feed-back, but that's currently not planed for the ITMs.
  (I rang up the 3.31Hz mode in ITMX PIT, and thus copied that everywhere. ITMY YAW I actually rung up 3.12Hz, so I moved the notch for that one.)
- They were gain-matched to the old filters at low frequencies.

- The filters were installed in FM10 of the ASC filter banks for DSOFT and CSOFT (see below). They should replace the old lead filters in FM2.

DSOFT_P (ITMX_PIT):
zpk([0.034375+i*0.548925;0.034375-i*0.548925;0.0700002+i*1.39825;0.0700002-i*1.39825],
    [6.52535+i*17.507;6.52535-i*17.507;7.32113+i*15.9155;7.32113-i*15.9155],0.236209,"n")
 notch(3.311,30,20)
gain(12.044,"dB")

DSOFT_Y (ITMX_YAW):
 zpk([0.035625+i*0.568886;0.035625-i*0.568886;0.0650001+i*1.29837;0.0650001-i*1.29837],
    [6.52535+i*17.507;6.52535-i*17.507;7.32113+i*15.9155;7.32113-i*15.9155],0.236209,"n")
 notch(3.311,30,20)
gain(13.06,"dB")

CSOFT_P (ITMY_PIT):
 zpk([0.034375+i*0.548925;0.034375-i*0.548925;0.0700002+i*1.39825;0.0700002-i*1.39825],
    [6.52535+i*17.507;6.52535-i*17.507;7.32113+i*15.9155;7.32113-i*15.9155],0.236209,"n")
notch(3.311,30,20)
gain(12.044,"dB")

CSOFT_Y (ITMY_YAW):
 zpk([0.034375+i*0.548925;0.034375-i*0.548925;0.067+i*1.33832;0.067-i*1.33832],
    [6.52535+i*17.507;6.52535-i*17.507;7.32113+i*15.9155;7.32113-i*15.9155],0.236209,"n")
notch(3.12,20,30)
gain(13.06,"dB")



Attached is a plot of old vs new TF for ITMY YAW.