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VIS (OMM)
ryutaro.takahashi - 17:55 Tuesday 08 November 2022 (22836) Print this report
Recovery of OSTM suspension

[Takahashi, Michael, Tanaka]

We recovered the OSTM suspension.

  1. We confirmed the situation again. The IM was touching the magnets in X+Y-.
  2. We tried to shift the suspension rods for the magnet box (IRM) which are fixed with the M5 nuts (photo), but we couldn't shift them more.
  3. We tried to bend the rods, but we couldn't owing to the thick type of rod.
  4. We found the IM was rotated much in yaw for the IRM. So we tried to rotate the suspension frame. After some preparations (guides, pusher, IR viewer, etc.), we tried to iterate the rotation of the frame and the recovery of the mirror alignment with the picomotor in order to keep the beam spot on the QPD1 in the OMC.
  5. We found we need too many iterations. So we put a small target between the OSTM and the OMC. We rotated the IM with picomotor manually looking at the beam spot on the target. During this adjustment, suddenly the IM was released from the magnets. The IM was sticking to the magnets by a kind of force (magnetic, electrostatic, ...)?
  6. We adjusted the suspension point of the rods for the IRM again.
  7. We aligned the mirror with picomotor manually.
  8. We went to the fine alignment.
Images attached to this report
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