Rahul K, Ibrahim A., TJ S
SEI & SUS configuration: BSC3 ISI and HEPI were locked, suspension unlocked and damped.
Accelerometer position 1 - Mounted at the bottom of the cage near the 7oclock position as seen in this photo. Accelerometer axis=IFO axis.
Meas 1 - Hitting near the accelerometer at around the 7 o'clock position in the +X direction.
Meas 2 - Hitting -Y around the 9 o'clock position.
Meas 4 - Hitting in +Z at the 6 o'clock at the bottom of the cage.
Accelerometer position 2 - This was the analagous spot to the ITMY measurements, on the cross bar between the penultimate mass and the bottom stage. Accelerometer axis to IFO axis (X,Y,Z=-Z,+X,-Y)
Meas 5 - Hitting in +X(ifo) on the crossbar under where the accelerometer is mounted.
Meas 6 - Hitting down, -Z (ifo), on the crossbar near accelerometer.
Meas 7 - Hitting in t -Y(ifo) direction on the +Y structure around the 9 o'clock position around the TM.
The logitudinal and transverse modes were about 0.5Hz lower with the accelerometer mounted in the second position, but hard to tell with this resolution.
| First Mode | Frequency (Hz) |
| Longitudinal | 59-59.5 |
| Transverse | 66.5-67 |
LHO ITMY B&K results found at alog90512. To save you the click, ITYM long. = 57.5Hx and Trans.=64,67.5Hz
