Differences between revisions 121 and 122
Revision 121 as of 2017-02-03 13:33:12
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Revision 122 as of 2017-02-10 13:36:19
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Editor: MarkBarton
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Deletions are marked like this. Additions are marked like this.
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  * Made BS disposable wire clamp 3Dmodel and drawings.
  * Made ballast mass drawings for BS Bottomfilter and Standardfilter.
  * Made parts list and screw list for disposable wire clamp and ballast mass.
  * Sent drawings and lists to i-ject for quotation.
  * Start to make drawings for SR big parts (optical bench,damper rings,sus wires,cable clamps) - ongoing.
 * Mark, Fabian and Enzo (at Kamioka):
  * Realized that some of the imbalance in the BF was from the fishing rod and calculated a new set of blade offsets to center the rod but leave the torque from the FR to be cancelled by the trim mass for now.
  * Applied the blade offsets and checked that the BF hung as expected.
  * Found that the yoke was rubbing again and corrected it by putting it at an angle matching the keystone.
  * Found that the cables were adding too much stiffness and friction and rerouted them.
  * Found that the GAS was unstable and reduced the compression symmetrically to get 0.37 Hz.
  * Rebalanced the IM to set the right pitch, yaw and height.
  * Tested the IM picos. Unfortunately the pitch pico stuck near or at one end of its range and we will need to take the end plate off the IM to find out what is wrong.
  * Did drawings of SR damper.
 * Mark, Fabian, Enzo and Hirata-san (at Kamioka):
  * Took the end plate off the IM to get access to the pitch/roll picos.
  * Found the pitch pico was unreliable and replaced it.
  * Found the springs were not stiff enough, and immobilized 7 turns at the end of each with Cu wire to make them stiffer.
  * Reassembled and rebalanced the IM.
  * Reassembled and adjusted the IRM.
  * Discovered that the transverse offset between IRM and IM could be corrected by adjusting the roll of the BF.
  * Adjusted IM OSEMs to half-way.
  * Made and installed a new pair of wires for the BF yaw pico on the IM pico adapter (Hirata-san).
  * Installed an improved LVDT cable made by Hirata-san.
  * Made and hung posters for the Elites meeting visitors.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

  • Hirata-san:
    • Did drawings of SR damper.
  • Mark, Fabian, Enzo and Hirata-san (at Kamioka):
    • Took the end plate off the IM to get access to the pitch/roll picos.
    • Found the pitch pico was unreliable and replaced it.
    • Found the springs were not stiff enough, and immobilized 7 turns at the end of each with Cu wire to make them stiffer.
    • Reassembled and rebalanced the IM.
    • Reassembled and adjusted the IRM.
    • Discovered that the transverse offset between IRM and IM could be corrected by adjusting the roll of the BF.
    • Adjusted IM OSEMs to half-way.
    • Made and installed a new pair of wires for the BF yaw pico on the IM pico adapter (Hirata-san).
    • Installed an improved LVDT cable made by Hirata-san.
    • Made and hung posters for the Elites meeting visitors.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-04-22 13:34:51 by fabian.arellano)