Reports until 16:31, Friday 12 September 2014
H1 SEI
hugh.radkins@LIGO.ORG - posted 16:31, Friday 12 September 2014 (13910)
WHAM3 ISI TFs -- Look much nicer with the custom HEPI Controllers (2hz UGF) versus generic (5hz ugf)

Attached are the TF taken Thursday morning.  Like those seen on HAMs 4 & 5 ISI, having the HEPI unlocked and position loops closed versus HEPI on stops, the HEPI structural bumps between 10 to 40hz, are reduced in frequency and lowered in Q, see the plots in 13763 for this comparison.  Unlike HAMs 4 & 5 however, which have generic 5hz HEPI loops, the HAM3 ISI doesn't see the H3 dip at ~6.5hz develop into a nasty high q zero; the HAM3 HEPI horizontal DoF controllers are 2hz ugf non-generic.

Hugo has produced new generic controllers with the 2hz ugf, I'll upload those as soon as the machine is available.

Images attached to this report