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Reports until 16:40, Monday 06 July 2026
H1 SUS
thomas.shaffer@LIGO.ORG - posted 16:40, Monday 06 July 2026 - last comment - 13:55, Tuesday 07 July 2026(90905)
MC2 B&K Results

Rahul K, TJ S

MC2 was unlocked, ISI and HEPI locked. 

Accelerometer location 1 - Roughly in the vertical center of cage on +Y,+X side. Acc dofs = IFO dofs

Meas 1 - Hitting -Y at the top of cage
Meas 2 - -X same area
Meas 3 - -Z top of cage, same corner

Location 2 - On the upper portion of the cage on the -X side. Acc dofs = IFO

Meas 4 - -Y on top corner of cage
Meas 5 - -X same corner
Meas 6 - -Z top of cage, same corner

When I get another minute, it will be interesting to see how these compare to the other triple suspensions that have these type of baffles.

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thomas.shaffer@LIGO.ORG - 13:55, Tuesday 07 July 2026 (90924)

2026 July PR2 B&K results - alog90906

I was able to find some B&K results from when we first installed this type of baffle on the triple suspension cages back in 2017 - alog39798. These vaguely match up, but I don't think they give enough insight to say how the new rail brackets affect the structure. Had we taken focused before and after measurements we could have grabbed some clearer data, but as things sit now the cages don't have any large peaks and it seems well damped.

Edit: Linked the incorrect alog orginally and made comments off of that link. Fixed with new comments.

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