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| = Scraps of text for incorporation in the Vis Meeting Minutes = | = 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). |
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).