J. Kissel, B. Weaver

After Jim and Travis unlocked the H1 ITMY ACB and the ISI, we quickly measured a few DOFs of H1 SUS ITMY (with HPI robustly isolated, and ISI damped) to confirm the SUS is now free, and was suffering from cross-coupling of the ACB suspension to the QUAD via a half-locked ISI (as suggested here). We have, and it is free. Indeed, we went so far as to fill out our H1 SUS ITMY directory with a plethora of transfer functions, gathering all DOFs with damping ON vs. OFF. With this data we can show that what is left of the 2.4 and 2.6 [Hz] resonant features that have been plaguing us for the past few days is not unexpected (no signs of 2.4 [Hz], and the ~2.6 [Hz] feature that's left in M0 V2V is a cross-coupled roll mode), and is happily damped out with the control system.

Close the chamber! Close the chamber!

Well, lock up the SUS real quick, peel off first contact, unlock the sus, measure TFs again, that THEN close up the chamber...

Note -- I haven't looked in a while, but we *really* should put more effort into the reaction chain damping filter design. And I'm sure by "we" it means me.