Differences between revisions 304 and 308 (spanning 4 versions)
Revision 304 as of 2018-07-20 13:48:01
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Editor: MarkBarton
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Revision 308 as of 2018-08-03 16:02:31
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Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
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==== Report for week of 7/17 ====
 * We checked the polarity of the IP LVDTs and flipped coil connections to get the standard arrangement.
 * We debugged an issue where one of the LVDT actuators had half the magnets in backwards resulting in no force.
 * We calibrated all the PI LVDTs.
 * We set the SF damper ring gap.
 * We prepped the suspension for craning, moved it into the tank and hooked the LBB damper ring rods.
 * Type A merged the SRM F0 with the correct IP, and we moved it out of the way (to the second floor behind the SRM tank).
 * We installed more cable clamps on the SR2 PI.
==== Report for week of 7/30 ====
 * We set up an OL outside the tank and checked the SR3 pitch - it was OK.
 * We ran power to the SR3 pico and stepper drivers and tested them.
 * We tried to offload a 700 µm discrepancy between the BF GAS zero position and the IM-V zero position but ended up scrambling the IRM-IM alignment, probably through sending a command to the wrong pico driver. We mostly fixed the BF/IRM pitch/roll, but we have some more work to do to fix the IM/RM/TM pitch/roll.
 * We debugged a problem with the SR2 alignment - the chain was offset by about 5 mm to +T, leading to fouling at the IM and RM levels. Some 2 mm of the offset was due to the F0 keystone being off center, apparently due to some combination of different-strength blades and the CuBe auxiliary spring, but the rest is a mystery.
 * We fixed a problem with the levelness of the PI due to the feet of the IP being set at uneven heights into the PI weldment, and it got the IP very closed to centered but it didn't fix the fouling problem.
 * We eventually fixed the fouling by setting the security structure at a slight angle so it remains slightly off at the SF level but is good at the bottom.
 * We installed the SR2 SF damper Cu segments and magnet ring.
 * Enzo and team debugged a malfunctioning bit in the SR3 IP BIO which turned out to be a defective 37-pin gender changer.
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==== Plan for week of 7/23 ====
 * Mark, Enzo, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri.
 * Hirata-san at Kamioka Mon-Thu.
 * Mirapro moves
assembly frame ≈7/25 (Wed).
==== Plan for week of 8/6 ====
 * Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri.
 * Kozu-kun works at Mozumi Mon, Fri, and Thu afternoon.
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 * Unlock suspension.
 * Rearrange cables.
 * Test.
 * Finalize optic pitch, OSEM alignment.
 * Do TFs with temporary OL.
 * Install final OL.
 * Hook LBB, add ballast mass.
 * Tune IP.
Line 25: Line 28:
 * Finish PI prep.
 * Crane into AF, suspend.
 * Start cable routing.
 * Do vertical height budget.
 * Choose F0 keystone height.
 * Add estimated final ballast mass.
 * Do PI cable routing.
 * Adjust ballast/trim mass, with reserve for cables.
 * Stage LBB damper rings in tank.
 
Line 29: Line 36:
 * Prepare to assemble SRM metal mass (most parts due Wed 7/25).
 * Help Mirapro with AF move.
 * Start rebuild of top filter of PI #2.
 * Assemble metal mass.
 * Glue prisms, flags.
 * Reconfigure, align assembly frame.
Line 39: Line 46:
 * Hirata-san at Mitaka 7/27.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 7/30

  • We set up an OL outside the tank and checked the SR3 pitch - it was OK.
  • We ran power to the SR3 pico and stepper drivers and tested them.
  • We tried to offload a 700 µm discrepancy between the BF GAS zero position and the IM-V zero position but ended up scrambling the IRM-IM alignment, probably through sending a command to the wrong pico driver. We mostly fixed the BF/IRM pitch/roll, but we have some more work to do to fix the IM/RM/TM pitch/roll.
  • We debugged a problem with the SR2 alignment - the chain was offset by about 5 mm to +T, leading to fouling at the IM and RM levels. Some 2 mm of the offset was due to the F0 keystone being off center, apparently due to some combination of different-strength blades and the CuBe auxiliary spring, but the rest is a mystery.

  • We fixed a problem with the levelness of the PI due to the feet of the IP being set at uneven heights into the PI weldment, and it got the IP very closed to centered but it didn't fix the fouling problem.
  • We eventually fixed the fouling by setting the security structure at a slight angle so it remains slightly off at the SF level but is good at the bottom.
  • We installed the SR2 SF damper Cu segments and magnet ring.
  • Enzo and team debugged a malfunctioning bit in the SR3 IP BIO which turned out to be a defective 37-pin gender changer.

Plan for week of 8/6

  • Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri.
  • Kozu-kun works at Mozumi Mon, Fri, and Thu afternoon.

SR3
  • Finalize optic pitch, OSEM alignment.
  • Do TFs with temporary OL.
  • Install final OL.
  • Hook LBB, add ballast mass.
  • Tune IP.

SR2
  • Do vertical height budget.
  • Choose F0 keystone height.
  • Add estimated final ballast mass.
  • Do PI cable routing.
  • Adjust ballast/trim mass, with reserve for cables.
  • Stage LBB damper rings in tank.

SRM
  • Assemble metal mass.
  • Glue prisms, flags.
  • Reconfigure, align assembly frame.

To-Do Lists, Schedule

Vacation Info

  • Terrence: 8/24-26 f2f, then returns to Hong Kong.
  • Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-07-29 13:18:56 by fabian.arellano)