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Size: 1443
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Size: 2739
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| Deletions are marked like this. | Additions are marked like this. |
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| At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): * We removed the BF cap to debug the stepper motor. We checked the cabling but didn't find a problem. Eventually toggling the power to the driver box seemed to fix it. * We got the wheels removed from the two tall stepladders. * We started to rebalance the IM but came to realize that it was unstable for more than trivial pitch and roll (and had been for some time). We moved trim mass from top to bottom and it became unconditionally stable. * We rebalance the IM, put back the IRM and adjusted the OSEMs. * We took a successful TF in IM-L. * We added the security structure ring for below the SF and then added the SF. We noticed the cap is on at the wrong angle (so the keystone lock screws are inaccessible) but we can easily fix that. |
At Kamioka (Mark, Fabian, Enzo, Hirata-san): * Hirata-san and Sekine-san moved the tank lid and service port ring to the pallet with the crane and covered the open tank with the spare clean bag. * Hirata-san and Mark got the LBB damper rings assembled and installed. A joint part for the Cu ring needed to have holes enlarged because the hole pattern did not quite match that on the half-ring. The magnet ring is hanging in the chamber and the Cu ring is attached below it with clamps, ready to receive the rods that will hang down from the PI. * Hirata-san recounted all the unused cables. * Hirata-san installed the outrigger parts on the LBB, which will receive the rods coming down from the damper ring. * Enzo and Mark tested all the stepper motors. * Enzo and Mark debugged the PI horizontal LVDTs. One LVDT had a flaky connection and one card in the LVDT driver had three dead channels. Enzo created a fully working driver using parts from another driver that also had a faulty card. * Fabian adjusted the ballast mass on the SF to get good pitch/roll/vertical adjustment and attached it with screws. * Fabian set up the optical lever again (the PR2 team had repossessed the breadboard we had been using but Akutsu-san supplied another one). * |
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| Next week: * Everyone (Mark, Fabian, Enzo, Perry Hirata-san) at Kamioka, Monday-Friday except for Hirata-san Wednesday-Friday). * Finish SF installation. * Finish BF cabling, hang BF/IRM/IM/RM/BS from SF and confirm weight matches load capacity. * Re-trim BF as necessary. * Get picomotor driver working. Week after next: * Everyone (Mark, Fabian, Enzo, Hirata-san) at Kamioka, Monday-Friday. * Prepare for PI installation. |
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]]. Week of 6/12: * Cabling: * Debug/fix PI vertical LVDTs #0 and #2. * Calibrate PI vertical LVDT. * Debug/fix geophone #1. * 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. * Prepare LBB. * Attach LBB outriggers and rod receptacles. * Prepare LBB Cu ring. * Remove from tank, fix incompletely threaded holes, reinstall in tank. * Lay down spacers to protect magnets (in next step). * Prepare LBB magnet ring. * Disassemble. * Pass pieces into tank. * Reassemble on top of Cu ring. * Install LBB damper. * Bind LBB damper rings together with slings. * 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. * Reconnect in-air cables. |
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 Sekine-san moved the tank lid and service port ring to the pallet with the crane and covered the open tank with the spare clean bag.
- Hirata-san and Mark got the LBB damper rings assembled and installed. A joint part for the Cu ring needed to have holes enlarged because the hole pattern did not quite match that on the half-ring. The magnet ring is hanging in the chamber and the Cu ring is attached below it with clamps, ready to receive the rods that will hang down from the PI.
- Hirata-san recounted all the unused cables.
- Hirata-san installed the outrigger parts on the LBB, which will receive the rods coming down from the damper ring.
- Enzo and Mark tested all the stepper motors.
- Enzo and Mark debugged the PI horizontal LVDTs. One LVDT had a flaky connection and one card in the LVDT driver had three dead channels. Enzo created a fully working driver using parts from another driver that also had a faulty card.
- Fabian adjusted the ballast mass on the SF to get good pitch/roll/vertical adjustment and attached it with screws.
- Fabian set up the optical lever again (the PR2 team had repossessed the breadboard we had been using but Akutsu-san supplied another one).
Plan for coming weeks
For more detail, see KAGRA/Subgroups/VIS/TypeB/ToDo.
Week of 6/12:
- Cabling:
- Debug/fix PI vertical LVDTs #0 and #2.
- Calibrate PI vertical LVDT.
- Debug/fix geophone #1.
- 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.
- Prepare LBB.
- Attach LBB outriggers and rod receptacles.
- Prepare LBB Cu ring.
- Remove from tank, fix incompletely threaded holes, reinstall in tank.
- Lay down spacers to protect magnets (in next step).
- Prepare LBB magnet ring.
- Disassemble.
- Pass pieces into tank.
- Reassemble on top of Cu ring.
- Install LBB damper.
- Bind LBB damper rings together with slings.
- 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.
- Reconnect in-air cables.