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).
• Enzo and Mark tested the pico motors. The software is very unreliable, but we we able to confirm that the IM pitch pico works.
• The whole team wrapped items and shut down equipment ahead of the power outage.

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.