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| * Hirata-san: * Worked on the PR optic removal jig. * Worked on getting modified quotes for PR/SR/BS parts. * Enzo-san * Worked on getting his drivers license. * Worked on getting familiar with the Type B circuit diagram. * Mark, Fabian (at Kamioka): * Tried different strategies for getting the IRM-IM EQ stops and IRM OSEMs to line up simultaneously. * Realized that the main problem was that the pitch of the BS had changed relative to the IM (presumably due to slight slippage of the wires) so the IM had to be pitched up by 16 mrad to get the BS pitched slightly down (4.7 mrad). * Took the sides off the IRM to get access to the clamps and tightened them to prevent further slips. * Rebalanced the IM to be level in pitch (and roll). * Reassembled the IRM and aligned the IRM-IM EQ stops - this time it was easy. * Adjusted the IRM and RM OSEMs to mid-range. * Got Kokeyama's new real-time model working and started TFs. |
At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): * Craned in the PI. * Assembled the thrust bearing holder that receives the PI-SF rod. (It originally had a burr that prevented the bearing from seating properly, and so required filing and re-cleaning.) * Hooked the SF and lowered the jacks under the SF to suspend the SF/... section. * The top filter rose when unlocked, and required about 1.8 kg to send it back down. Therefore we may be OK - the top filter seems to have about 8 kg more capacity than as measured by G&M. The hex cable clamp (≈0.25 kg) and the cables between the PI and SF still have to be added, but we can get an extra 3 kg by removing one of the three Cu damper segments (and rearranging the other two). * Built and installed three LBB blade units. * Kept debugging the SF LVDT. We repaired several broken wires, but it's still not behaving correctly. |
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| * Mark and Enzo come to Kamioka and work on rack and cabling. * Fabian works on design, including SR assembly frame. * Hirata-san works on procurement. |
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]]. Week of 5/1: * No activity (Golden Week). Week of 5/8: * Work from Tuesday. * Remove PI temporarily. * Add magnets to upper SF damper ring. * Reinstall PI with damper ring. * Reinstall PI-SF rod, this time with hex cable clamp. * Install PI yaw stepper. * Wire up PI yaw and vertical steppers. * Route cables from SF to PI (may involve removing part of Cu damper). |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Past week report
At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san):
- Craned in the PI.
- Assembled the thrust bearing holder that receives the PI-SF rod. (It originally had a burr that prevented the bearing from seating properly, and so required filing and re-cleaning.)
- Hooked the SF and lowered the jacks under the SF to suspend the SF/... section.
The top filter rose when unlocked, and required about 1.8 kg to send it back down. Therefore we may be OK - the top filter seems to have about 8 kg more capacity than as measured by G&M. The hex cable clamp (≈0.25 kg) and the cables between the PI and SF still have to be added, but we can get an extra 3 kg by removing one of the three Cu damper segments (and rearranging the other two).
- Built and installed three LBB blade units.
- Kept debugging the SF LVDT. We repaired several broken wires, but it's still not behaving correctly.
Plan for coming weeks
For more detail, see KAGRA/Subgroups/VIS/TypeB/ToDo.
Week of 5/1:
- No activity (Golden Week).
Week of 5/8:
- Work from Tuesday.
- Remove PI temporarily.
- Add magnets to upper SF damper ring.
- Reinstall PI with damper ring.
- Reinstall PI-SF rod, this time with hex cable clamp.
- Install PI yaw stepper.
- Wire up PI yaw and vertical steppers.
- Route cables from SF to PI (may involve removing part of Cu damper).