Differences between revisions 119 and 120
Revision 119 as of 2017-01-20 13:49:48
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Revision 120 as of 2017-01-27 13:28:23
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Editor: MarkBarton
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Deletions are marked like this. Additions are marked like this.
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  * Updated the 3D assembly model for BS (among other issues, it turned out that parts were not correctly mated near where the suspension sits on the hydraulic jacks in the tank).
  * Liaised with IJECT.
  * Made an inventory for Type B (BS and SR).
  * Packed and shipped second winch to Kamioka.
  * Packed some jigs for adjusting BF blades.
  * Attended NINS information security seminar.
  * Attended the public hearing for the Opt-IR Research Division Chief Election.
 * Mark, Fabian, Enzo
  * Cabled IM picos and used IM yaw pico for adjusting RM. (Later, a wire broke at the connector, disabling the IM yaw, but we were able to continue by manually rotting the pic.)
  * Helped Takahashi-san in adjusting BF.
  * Initial round of adjustment made transverse perfect but overshot in longitudinal and made vertical unstable.
  * Second round of adjustment made vertical stable but left longitudinal offset.
  * Concluded that we can probably manage without bringing the BF back to Mitaka, but it will take some careful surveying of the existing offset and several more days of adjustment.
  * 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).

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

  • Hirata-san:
    • 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).

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