Differences between revisions 305 and 308 (spanning 3 versions)
Revision 305 as of 2018-07-27 14:19:43
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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 7/23 ====
 * We finished adding cable clamps to the SR2 PI and SF.
 * We craned in the SR2 PI and installed the PI-SF rod. As expected, there was not quite enough load capacity for even a 2 Cu-segment SF.
 * We changed the CuBe spring on the SR2 PI from an F2 type to an F1 and got about an extra 2 kg, which is plenty for 2 Cu segments.
 * We moved the feedthroughs from the SR3 assembly frame to the SR3 tank. Mirapro then moved the assembly frame to the SRM area. Mirapro also moved the duct on the +Y side of the SR3 tank to give us access to that side.
 * We laid a new set of SR3 in-air cables running directly to the tank. (We will repurpose the original set for SRM.)
 * We reconnected the SR3 cables on both sides of the feedthroughs. We had to adjust the routing of the in-vacuum ones several times to stop them touching the tank, but we finally found a good solution.
 * With help from Ohishi-san we removed the First Contact and then unlocked the whole suspension by stages. We need to check the optic pitch and do a little more mechanical adjustment but we were able to take TFs and implement IM and GAS control filters.
 * Hirata-san and Fujii-kun received most of the SRM metal mass parts, did inventory and practiced some of the key steps in the assembly, especially inserting the Sol-Black coated parts without touching the delicate surfaces.
 * Mark did inventory of the BIO stuff for the WD and of the OL parts.
==== 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 7/30 ==== ==== Plan for week of 8/6 ====
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 * Hook LBB, add ballast mass, set up temporary OL (horizontal beam, pitch/yaw only).
 * Identify/acquire items required for final OL (steering mirrors, second QPD, lens, collimator).
 * Do TFs with temporary OL.
 * Install final OL.
 * Hook LBB, add ballast mass.
 * Tune IP.
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 * Fix issue with PI/SS/chain alignment.
 * Put magnets on SR damper ring (2 Cu segment pattern).
 * Remove PI-SF rod temporarily, install Cu segments and damper ring.
 * Do vertical height budget; choose optimum F0 keystone height.
 * Do vertical height budget.
 * Choose F0 keystone height.
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 * Stage LBB damper rings in tank.
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 * Set up filter tuning area.
 * Tune F0 for SRM.
 * Add LBB blade units, cable clamps etc.
 * Check PI coil connections, IP LVDT magnets.
 * Assemble metal mass.
 * Glue prisms, flags.
 * Reconfigure, align assembly frame.

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 2022-06-24 12:23:36 by fabian.arellano)