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Size: 3042
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| Deletions are marked like this. | Additions are marked like this. |
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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, Hirata-san): * Hirata-san and Mark reversed the support ring for the LBB damper to match the reversed suspension. * Hirata-san did a trial assembly of the magnet ring for the LLB damper and placed magnets on it with the template. * Hirata-san and Mark put the base pieces for the Cu ring in the chamber. However it turns out that the holes for attaching the joint pieces are incompletely threaded and we will have to run a tap through them. * We tested the geophones. At first one didn't work at all. This turned out to be a broken wire in one of the in-vacuum adapter cables. For the test we replaced the adapter with an old-style one (and removed the matching descrambler). A second geophone mostly works but saturates at a suspiciously low number of counts at the ADC (2000 instead of 20000). * We tested the PI horizontal LVDTs. The #1 (H2) one works but cable swaps showed that #0 and #2 have issues both at the tank end and at the card. * We decided on a final location for the stepper and pico drivers on the second floor. We moved the cables for the stepper drivers (using the outside cable trays) and laid new LAN and AC cables for the picos. |
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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 6/6: * Cabling: * Finish moving in-air cabling to match feedthrough positions. * Cable and test PI vertical LVDT. * Calibrate PI vertical LVDT. * Set yoke on PI vertical LVDT (if necessary). * Cable and test PI yaw stepper. * Cable and test PI vertical stepper. * Cable and test PI horizontal steppers. * Cable and test PI horizontal LVDTs. * Calibrate PI horizontal LVDTs. Week of 6/12: * Remove -Y flange cover, replace with cloth cover (or foil). * Prepare LBB. * Wipe LBB. * Loosen or remove LBB hold-down bolts. * Attach LBB outriggers and rod receptacles. * Lay out slings for LBB damper rings. * Prepare LBB damper support. * Install rods for LBB magnet ring. * Install safety rods for LBB Cu ring. * Prepare LBB Cu ring. * Pass into tank. * Reassemble on top of slings. * Lay down spacers to protect magnets (in next step). * Prepare LBB magnet ring. * Assemble temporarily. * Attach magnets with template. * Disassemble. * Pass into tank. * Reassemble on top of Cu ring. * Install LBB damper. * Pass sling ends through loops to bind LBB damper rings. * Remove vacuum tank lid and ring. * Crane rings up to install height, hook LBB magnet ring and support LBB Cu ring by TBD method. * Crane suspension into tank. * Hook LBB Cu ring. * Hook LBB. * Crane vacuum tank lid+ring black on. * Remove vacuum tank lid (only). * Remove port covers where feedthroughs will go, move feedthroughs from assembly frame and install on vacuum tank ring. * Cabling, cabling, cabling. |
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, Hirata-san):
- Hirata-san and Mark reversed the support ring for the LBB damper to match the reversed suspension.
- Hirata-san did a trial assembly of the magnet ring for the LLB damper and placed magnets on it with the template.
- Hirata-san and Mark put the base pieces for the Cu ring in the chamber. However it turns out that the holes for attaching the joint pieces are incompletely threaded and we will have to run a tap through them.
- We tested the geophones. At first one didn't work at all. This turned out to be a broken wire in one of the in-vacuum adapter cables. For the test we replaced the adapter with an old-style one (and removed the matching descrambler). A second geophone mostly works but saturates at a suspiciously low number of counts at the ADC (2000 instead of 20000).
- We tested the PI horizontal LVDTs. The #1 (H2) one works but cable swaps showed that #0 and #2 have issues both at the tank end and at the card.
- We decided on a final location for the stepper and pico drivers on the second floor. We moved the cables for the stepper drivers (using the outside cable trays) and laid new LAN and AC cables for the picos.
Plan for coming weeks
For more detail, see KAGRA/Subgroups/VIS/TypeB/ToDo.
Week of 6/6:
- Cabling:
- Finish moving in-air cabling to match feedthrough positions.
- Cable and test PI vertical LVDT.
- Calibrate PI vertical LVDT.
- Set yoke on PI vertical LVDT (if necessary).
- Cable and test PI yaw stepper.
- Cable and test PI vertical stepper.
- Cable and test PI horizontal steppers.
- Cable and test PI horizontal LVDTs.
- Calibrate PI horizontal LVDTs.
Week of 6/12:
- Remove -Y flange cover, replace with cloth cover (or foil).
- Prepare LBB.
- Wipe LBB.
- Loosen or remove LBB hold-down bolts.
- Attach LBB outriggers and rod receptacles.
- Lay out slings for LBB damper rings.
- Prepare LBB damper support.
- Install rods for LBB magnet ring.
- Install safety rods for LBB Cu ring.
- Prepare LBB Cu ring.
- Pass into tank.
- Reassemble on top of slings.
- Lay down spacers to protect magnets (in next step).
- Prepare LBB magnet ring.
- Assemble temporarily.
- Attach magnets with template.
- Disassemble.
- Pass into tank.
- Reassemble on top of Cu ring.
- Install LBB damper.
- Pass sling ends through loops to bind LBB damper rings.
- Remove vacuum tank lid and ring.
- Crane rings up to install height, hook LBB magnet ring and support LBB Cu ring by TBD method.
- Crane suspension into tank.
- Hook LBB Cu ring.
- Hook LBB.
- Crane vacuum tank lid+ring black on.
- Remove vacuum tank lid (only).
- Remove port covers where feedthroughs will go, move feedthroughs from assembly frame and install on vacuum tank ring.
- Cabling, cabling, cabling.