Reports until 15:06, Sunday 20 November 2011
H2 SUS
jeffrey.kissel@LIGO.ORG - posted 15:06, Sunday 20 November 2011 - last comment - 07:29, Tuesday 22 November 2011(1771)
H2 SUS FMY M0 F1 BOSEM Cross-coupled to Yaw
J. Kissel, T. Sadecki

After installing further fiber guard protection, and freeing up both chains the H2 SUS ITMY, Travis and I attempted to diagonalize the M0 and R0 BOSEMs. Though we were successful at achieving at as good as we normally get on R0, were became stumped by M0. First, the measurement of the vertical diagonalization was limited by the loss of M0 RT (see 1770), but at least the coil side still worked. F1 gave up the most trouble -- in yaw, regardless of where we moved the BOSEM sensor/coil with respect to the flag, we could not find a spot that had better than a few dB isolation from F2 and F3. We can normally get ~15 dB, if not better. After about a half hour's worth of trying, we called it quits, so I could go in for a round of transfer functions in hopes that it might reveal more.

Note -- though the suspension is free, it's alignment has only been roughed in. Pitch has been confirmed to be well aligned by Jason / IAS tooling, but other degrees of freedom remain only bubble leveled at best.
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Comments related to this report
jeffrey.kissel@LIGO.ORG - 07:29, Tuesday 22 November 2011 (1779)
Sorry -- typo in the title of this entry -- This entry refers to H2 SUS ITMY, not H2 SUS FMY.