J. Kissel

I've designed and installed some primitive damping loops in the H1 SUS OFI's DAMP bank. I mocked up a plant model in Foton using the in-air measured data from LHO aLOG 39033,  copied over some basic filters from the OMs, and had foton model the open loop gain of the loops. Without any requirements or specifications, I've arbitrarily chosen a loop gain of ~5 around the resonances as a start. Once we get all electronics figured out, I'll characterize the new loops via measurement and adjust the gain / design accordingly.

Design details:
H1:SUS-OFI_M1_DAMP_L: 
    FM1 (0:100,100) -- a complex pair of poles at 100 Hz with a Q of 0.87 between them
    FM5 (cheby5) -- a 2nd order Chebyshev low pass, with a 5 Hz corner frequency and 2 dB of pass-band ripple
    FM6 (gain) -- a x200, gain only "filter"
    FM9 (PendL) -- [DO NOT USE] the plant model, to be used for offline design assistance only

H1:SUS-OFI_M1_DAMP_T:
    (Same as L, but the FM6 gain "filter" has a value of x4000)


H1:SUS-OFI_M1_DAMP_T:
    (Same as L, but the FM6 gain "filter" has a value of x50)