Differences between revisions 120 and 121
Revision 120 as of 2017-01-27 13:28:23
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Revision 121 as of 2017-02-03 13:33:12
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Deletions are marked like this. Additions are marked like this.
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  * Received many parts from i-ject for BFRM (took pictures and took them into ATC cleanroom).
  * got quotes for PRM/SRM payload from i-ject.
  * Checked quotes and asked for some modifications.)
  * Washed parts (parts for type-A, small hexagons, screws, etc\)
  * Wiped 9 piano wires and sent to Kamioka for PR.
  * pdated Fabian's EQstop parts for BS recoilmass and updated EQstop assy drawings.
 * Fabian
  * Worked out geometry for blade adjustment.
  * Designed additional ballast masses for BS BF (and SR).
 * Mark and Enzo (at Kamioka)
  * Did two rounds of adjustment of the blades with help from Takahashi-san (one for position, one for frequency)
  * Surveyed the position of the rod using the vertical mode of the bubble level.
  * Got apparent improvement as judged at the IRM-IM EQ stops (but still not perfect).
  * Did one more round of blade adjustments (without Takahashi-san)
  * Got good agreement with IRM-IM EQ stops, so put BF cap on and raised the whole system to check for balance.
  * Found balance still fairly bad: about the same on the -X,+Y diagonal and about half on the +X,+Y diagonal (70 and 30 mm worth of motion of a single trim mass respectively; previous a bit over 70 mm each).
  * From the imbalance torques, calculated the offset of rod as 2.3 mm in the direction 22 degrees to the +X side of -Y.
  * Calculated the blade adjustments required: {-0.325194, -1.79175, 2.11695} mm
  * Prepared to apply adjustments (removed cap etc).
  * 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.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

  • Hirata-san:
    • 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.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-07-29 13:18:56 by fabian.arellano)