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 * Activity report for week of 12/19
  * Hirata-san made (and Fabian and Mark checked) drawings and parts/fastener lists for the SRM/PRM order and various others: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5964| D1605964]], [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5965| D1605965]], [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5956| D1605956]], [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5963| D1605963]], [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5977|D1605977]], etc.
  * Fabian designed a simple two-piece hold-down device to immobilize the SRx IMs during the optic and RM hanging. It avoids having to remachine all the IM support bars to allow for hold-down screws. The Type Bp team might also want to use it.
  * Aso-san and Mark discussed the [[KAGRA/Subgroups/VIS/VISMinutes20161216#BFIssue|BF issue]] from last week.
   * It was decided to ask Takahashi-san to take a look at the BF while he's at Kamioka this week.
   * It was decided to have the BS bottom filter moved to Mitaka for tuneup and adjustment as soon as possible in the new year.
  * Raffaele, Aso-san, Mark and Fabian discussed having much smaller/shorter BS and SR stub flags plus longer, coil-only OSEMs.
   * Aso-san volunteered to do the OSEM design.
   * Hirata-san made Pack'n'Go archives of the existing designs as a baseline for Aso-san.
  * Hirata-san searched for missing PR mirror box parts.
  * Miyakawa-san finished recabling the PR2 rack and got the BS real-time model running again. (The problem had been a new requirement for a safe.snap file to be provided in the burt directory, which was imposed by RCG2.9.7.) The model still needs lots of work, but it has the OSEM functionality needed for the next test-hang stage, plus Okutomi-san's improvements.		  * 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).

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 2022-10-28 10:02:46 by fabian.arellano)