thomas.shaffer@LIGO.ORG - posted 16:42, Friday 05 June 2026 (90512)
ITMY Cage B&K results with new baffles
With the new cage baffles installed on ITMY, Anamaria and I went in to hammer the cage. The suspension was unlocked and the ISI locked. The accelerometer was mounted on the cross member between the L3 and L2 stages (photo) with the accelerometer axes X,Y,Z = IFO -Z,Y,X. All plots have the accelerometer axes plotted. Measurement numbers are just for my own reference. LLO's results for their ITMs can be referenced in LLOalog81300.
| Hit Description | Photo | Plot | |
| Meas 2 | on top crossmember hitting in -Z IFO | Attachment 5 | Attachment 1 |
| Meas 4 | Hitting from side of cage -X IFO | Attachment 6 | Attachment 2 |
| Meas 5 | +Y IFO on the TM side of the cage on the baffle bracket | Attachment 7 | Attachment 3 |
| Meas 6 | +Y IFO at the bottom of the cage | Attachment 8 | Attachment 4 |
Longitudinal first peak 57.5Hz
Transverse first peak 64Hz, with a second nearby at 67.5Hz
Images attached to this report
