Tuesday I updated the HAM1 HEPI loops, to make them more like the LLO loops. It's not a total success, but increase of high frequency gain in the Z loop was successful. However, I found  the X plant was somehow significantly different from the last time I worked on this chamber in the 10-100 hz region, and I haven't had a chance to investigate and figure out why yet. Unfortunately, I wasn't able to get the X loop totally stable, it kept tripping the platform when guardian engaged the loops. I'll try to copy in the old loop and see if it's still stable, or see if I can come up with something better when time allows.

Attached plot are asds and tfs comparing the motion last night and Tuesday, before I installed the new loops. Top plot shows asds, the solid lines are the ITMY sts and HAM1 z L4Cs from Tuesday, dashed are from last night. Bottom plot are the TF from the sts to the HAM1 z l4cs. The 10-20 hz region shows that we are now actually getting some suppression, rather than amplifying.