Rahul K, Ibrahim A., TJ S

SEI & SUS configuration: BSC2 ISI and HEPI were locked, suspension unlocked and damped.

Accelerometer position #1 - Mounted in a similar position from when Rahul B&K'd the BBSS in the staging building last year (T2500205). Axis for the accelerometer are +X=perpendicular to BS surface, +Y parallel to BS in the -X-Y direction, and +Z=IFO+Z. DOFs mentioned from here on will be in the accelerometer axis unless otherwise specified.

Meas 1 - Hitting in the +X direction on the corner opposite of the accelerometer.

Meas 2 - Hitting +Y on the same corner.

Meas 3/4 - Hitting in +Z on the same corner (data from measurement 4 but 3 in my notes)

Accelerometer position #2 - The accelerometer was then mounted on the bottom structure on the AR side, at the 4o'clock position. Unfortunately, the data from this set seems to all be noise, something I couldn't quite tell chamberside.

This isn't the best data and I don't' see any clear peaks other than the 21Hz and 47Hz on the 3/4 measurement. The first longitudinal mode that I see is maybe at 111Hz. If we compare to LLO (LLOalog81300), our 111Hz should be the second order of this mode, so we might be in the right ballpark. Either way, I don't see anything egregious, so that's a good sign. It's unfortunate we didn't get the second accelerometer position as I think that would have given us some better movement of the cage. 

For reference LLO's inchamber BBSS results can be found at LLOalog81300.