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Revision 194 as of 2017-09-29 09:00:42
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Revision 210 as of 2017-12-08 12:59:36
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At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun):
 * We moved all the in-air cables over to the tank.
 * We plugged all the in-air and in-vacuum cables into the feedthroughs and checked that we got signals from all the output channels (actuation not yet tested). We had to work around a snag with the new F-F gender changers that replace many Type 1 and Type 2 cables: like the vacuum feedthroughs, they flip pins 1 and 5. Electrically they could just be omitted, but the in-air cables don't plug directly into the feedthroughs very well, so we made up some non-flipping adapters similar to the anti-feedthrough adapters.
 * Hirata-san fixed a problem with one of the rods supporting the LBB Cu ring, where the head was not seating in the receptacle at the bottom. The head was slightly bent so he just reinstalled the rod upside-down to move the bent head to a less critical spot. (This also establishes that it's possible to install the rods later if we need to, although it's more convenient to bring them in with the suspension on the crane as we've been doing it.)
 * We suspended the LBB. Per a request from Akutsu-san, we set it as high as we easily could. We decided to try for 30 mm higher than in the CAD, for a height of 367 (instead of 397) mm for the beam line above the LBB. 40 mm would also be doable, but any more would need new rods, and more than ≈100 mm would cause the LBB to hit the bottom of the security structure.
 * We moved a lot of stuff out of the +X side of the cleanbooth to behind SRM, so that Mirapro could connect the section of beam duct between the BS tank and the X arm. They put the new section in position but have not connected it up yet.
 * Hirata-san worked with Mirapro to get the SR assembly frame assembled in the SR3 area. (Insertion of the LBB and installation of the top of the tank is planned for 10/18-20.)
 * We investigated a problem with the IM OSEM readings, which were far from mid-range. Although Fabian and Ohishi-san got the payload hanging nicely on Thu 9/21, sometime between then and when we plugged the OSEMs back in on 9/28, the BF and IRM apparently tipped considerably (with the +X corner high) so that the H2 and H3 OSEM flags are fouling on the bottom and top of their respective OSEMs. Perhaps they were bumped accidentally during LBB work.
 * [To be continued. Do our intrepid investigators fix the problem without having to crane the suspension out of the tank again? Stay tuned for the next exciting installment!]
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==== Plan for week of 10/2 ====
Kamioka: Mark, Enzo (Tue-Fri), Hirata-san(?), Ohishi-san.
 * Finish preparation for SR2 work.
 * '''Fix BF/IRM tilt issue!!!'''
 * Debug electronics, especially actuation.
 * Tune IP, do LVDT/stepper calibration.
 * Remove First Contact, try OL.
Mitaka: Fabian, Hirata-san(?)
 * Design ballast for LBB.
 * Design improved PI yaw adjustment.
 * SR procurement.
 * Mark analyzed the QPD data from Friday 12/1 and derived matrices to diagonalize the QPD, and calibrate output in µrad. In the process an error in the IM OSEM diagonalization was discovered: the P and Y gains were low by a factor 2.
 * Mark re-zeroed the QPD after noting the micrometer readings so we can do TFs over the weekend.
 * We prepared for the SR2 gluing:
  * We aligned the SR2 in the box with the wedge on the correct side.
  * We checked that the remachined BS prism holders fit on the PR2 mirror box.
  * We checked that with Tatsumi-san's support ring, the prisms would go on at the right height.
  * We checked the new magnet jigs.
 * We glued ferromagnetic disks in a large number of IM flag tips and flag bases, and in the SR magnet jigs.
 * We also glued SR magnets in the magnet bases.
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==== Plan for week of 10/10 ====
Holiday Mon 10/9, Open Day prep Fri 10/13.<<BR>>
 * Final preparation for alignment in week of 10/16.
==== Plan for week of 12/11
 * Mark, Fabian, Enzo, Kozu-kun (Mon-Thu only), Hirata-san, Shoda-san at Kamioka.
 * Mirror gluing.
 * IM assembly and pico test.
 * Assembly frame alignment and optical table centering.
 * Move trolley system from SR3.
 * OL setup.
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==== Plan for week of 10/16 ====
 * Work with alignment team.
==== Plan for week of 12/18 ====
 * Shoda-san vacation
 * Ma
rk, Fabian, Enzo, Kozu-kun at Kamioka Mon-Wed.
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Mark: 10/16-24  * Mark 12/22-1/3
 * Enzo, 12/21-12/27 (but ''not'' 12/28)
 * Fabian 12/22-1/5
 * Hirata-san 12/21-22 (conference)
 * Shoda-san 12/18-21
  

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Past week report

  • Mark analyzed the QPD data from Friday 12/1 and derived matrices to diagonalize the QPD, and calibrate output in µrad. In the process an error in the IM OSEM diagonalization was discovered: the P and Y gains were low by a factor 2.
  • Mark re-zeroed the QPD after noting the micrometer readings so we can do TFs over the weekend.
  • We prepared for the SR2 gluing:
    • We aligned the SR2 in the box with the wedge on the correct side.
    • We checked that the remachined BS prism holders fit on the PR2 mirror box.
    • We checked that with Tatsumi-san's support ring, the prisms would go on at the right height.
    • We checked the new magnet jigs.
  • We glued ferromagnetic disks in a large number of IM flag tips and flag bases, and in the SR magnet jigs.
  • We also glued SR magnets in the magnet bases.

==== Plan for week of 12/11

  • Mark, Fabian, Enzo, Kozu-kun (Mon-Thu only), Hirata-san, Shoda-san at Kamioka.
  • Mirror gluing.
  • IM assembly and pico test.
  • Assembly frame alignment and optical table centering.
  • Move trolley system from SR3.
  • OL setup.

Plan for week of 12/18

  • Shoda-san vacation
  • Mark, Fabian, Enzo, Kozu-kun at Kamioka Mon-Wed.

Vacation Info

  • Mark 12/22-1/3
  • Enzo, 12/21-12/27 (but not 12/28)

  • Fabian 12/22-1/5
  • Hirata-san 12/21-22 (conference)
  • Shoda-san 12/18-21

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-10-28 10:02:46 by fabian.arellano)