Reports until 16:11, Wednesday 05 March 2014
H1 ISC
stefan.ballmer@LIGO.ORG - posted 16:11, Wednesday 05 March 2014 (10559)
PRMI locked with ballanced BS/PRM feed-back for MICH
Kiwamu, Yuta, Stefan

We finished installing the inverse plant filters for PRM and BS. Compared to yesterday, we lowered the Q of the <1Hz to 5. This effectively adds some boost at the main pendulum resonance, bud hardly affects the cancellation above 2Hz.

Locking with the new filters required some reshuffling of limiters and boost filters. See snapchot.

We then added PRM feed-back to the MICH loop, driving it at 99 Hz and cancelling its signature in REFL_45_I.
We rescaled the BS gain (divided it by 16) to make the MICH output matrix the correct one from theory (1,-0.5). 
An updated all-included-snapshot is attached.

New OLG measurements are also included.

Attached are a screen shot of all relevant MEDM screens, as well as PRCL and MICH OLG measurements.

The LSC Guardian was updated to reflect these changes.

Inverse plant filters:
BS:
zpk([0.0382738+i*1.57475;0.0382738-i*1.57475;0.0647002+i*1.13667;0.0647002-i*1.13667;
    0.0420175+i*0.418069;0.0420175-i*0.418069],[0.0163157+i*1.54679;0.0163157-i*1.54679],1,"n")
zpk([],[0.5+i*0.866025;0.5-i*0.866025],1,"n")zpk([],[1250+i*4841.23;1250-i*4841.23],1,"n")

PRM:
zpk([0.130304+i*2.84281;0.130304-i*2.84281;0.092145+i*1.61388;0.092145-i*1.61388;
    0.0683932+i*0.680504;0.0683932-i*0.680504;37.2961],
    [0.139329+i*2.35023;0.139329-i*2.35023;9.53503+i*13.2475;9.53503-i*13.2475;3.58083;
    0.5+i*0.866025;0.5-i*0.866025],1,"n")


MICH roll-off filter (to avoid BS saturation):
zpk([-0+i*120;-0-i*120],[25+i*43.3013;25-i*43.3013;50+i*86.6025;50-i*86.6025;400],1,"n")
Images attached to this report