Differences between revisions 284 and 285
Revision 284 as of 2018-05-11 12:58:39
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Revision 285 as of 2018-05-24 16:09:14
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Editor: MarkBarton
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==== Report for week of 5/7 ====
 * We inspected the wires and clamps involved in the wire break.
  * The scars on the clamp on the tungsten wire that failed had very different depths, with the one that failed being much deeper, so probably the clamp piece was not completely straight before tensioning. However one wire on the other side was also badly crushed and on the point of failing, so the tension was clearly too much.
  * We decided on new torque specs of 2 N.m for the primary clamps (down from 5 N.m) and 10 N.m (down from 20 N.m) for the secondary. The secondary clamp spec, for M6 screws, is now based on the LIGO policy of using the maximum suggested for the screw and the LIGO value for a coated 1/4-20 screw (100 in-lb = 11.3 N.m), and the primary clamp spec is derated by 2/3 from the spec for an M5 screw because the clamp pieces are recessed and only grip the wire at narrow sections along the edges, concentrating the force.
  * None of the screws showed any signs of damage.
  * All of the scars on the primary clamps were shallow enough that could reuse the clamp pieces. The tungsten secondary clamps were never tightened, and the outer pieces of piano wire secondary clamps were badly scarred but could be reused upside down.
 * We successfully rehung the SR3 and RM. In the process we noticed and fixed an issue with the assembly frame (due to an out-of-date number in the Mirapro diagram, the IM crossbars were set 3 mm too high, which would have affected the wire length).
 * We added the sections of the security structure below the RM and up to the BF.
 * We installed the TM OSEM cables and routed them up to the IM.
 * We installed the load gauge adapter and load gauge and prepared the IM/... section for weighing.
 * We removed the three cracked F0 blades from the PI #3 in the SRM, and prepared for testing prototype new blades in that PI. We removed a floor panel under the PI and set up the filter service trolley underneath it with a stack of masses for a dummy load.
 * Mirapro installed the SRM mushroom.

==== Plan for week of 5/14 ====
 * Mark, Enzo, Hirata-san, Kozu-kun at Kamioka Mon-Thu, then Osaka.
 * Weigh IM/... section.
 * Characterize F0 blade prototypes.
 * Remove F0 blade prototypes (and send for rework if necessary).
 * Start characterizing LBB blades.
 * Crane in BF.
 * Add IRM top plate, maraging rod, flying saucer.
 * Suspend IM, check pitch, roll and vertical, adjust trim mass.
 * Cable and (re-)test TM OSEMs, IM picos, BF yaw pico, BF LVDT and FR.

==== Plan for week of 5/21 ====
 * Mark, Enzo, Hirata-san, Kamioka Mon-Fri.
 * Kozu-kun at Kamioka Wed-Fri.
 * Install IRM sides, and IM OSEMs.
 * Center IM OSEMs (in/out and laterally)
 * Route all cables to underneath BF.
 * Add BF internal ballast mass.
 * Add BF cap.
==== Report for weeks of 5/14, 5/21 ====
 * We weighted the IM/... section of the SR3.
 * We set up for the F0 blade prototype test.
 * Takahashi-san characterized the F0 prototype blades, and ordered final blades based on the BS and SR mass budgets.
 * Hirata-san characterized the LBB blades and identified three sets with blades of similar strength, plus two weaker ones. However he realized that M12x50 Bumax screws for the blade sets had not been ordered, so he got a new quote and ordered them for delivery 6/11.
 * Mirapro installed the mushroom section of the SRM tank.
 * We craned in the BF and cabled and tested the yaw pico, the FR stepper and the LVDT.
 * We hung the IM/... section from the BF, removed ≈200 g of trim mass and rearranged the rest to get the desired height, pitch and roll.
 * We added the sides of the IRM and the IM OSEMs, cabled the OSEMs, and adjusted everything to get good lateral and in/out alignment of the OSEMs.
 * Hirata-san organized getting the LBB damper rings into the SR3 tank. He joined the halves of the Cu and magnet rings and got them ready for craning (which will happen later when we have rebuilt the SR3 IP and have somewhere to park the lid of the vacuum chamber). However he encountered a problem with the top ring: one of the screw holes in the top of the tank is not fully threaded, so one of the pillars to support half of the ring cannot be attached. He is considering various options.
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 * Mark, Enzo, Hirata-san, Kamioka Mon-Fri.
 * Kozu-kun at Kamioka Mon only.
 * Mark, Enzo at Kamioka Mon-Fri.
 * Hirata-san at Kamioka Tue-Fri. (Mon is monthly Mitaka day.)

 * Kozu-kun at Kamioka Mon only. (Rest of week is job interviews.)
 
Line 43: Line 23:
==== Plan for week of 6/4 ====
 * Mark, Enzo, Hirata-san, Kozu-kun at Kamioka Tue-Fri. (Mon is medical checkup at Mitaka.)
 
 * TBD.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for weeks of 5/14, 5/21

  • We weighted the IM/... section of the SR3.
  • We set up for the F0 blade prototype test.
  • Takahashi-san characterized the F0 prototype blades, and ordered final blades based on the BS and SR mass budgets.
  • Hirata-san characterized the LBB blades and identified three sets with blades of similar strength, plus two weaker ones. However he realized that M12x50 Bumax screws for the blade sets had not been ordered, so he got a new quote and ordered them for delivery 6/11.
  • Mirapro installed the mushroom section of the SRM tank.
  • We craned in the BF and cabled and tested the yaw pico, the FR stepper and the LVDT.
  • We hung the IM/... section from the BF, removed ≈200 g of trim mass and rearranged the rest to get the desired height, pitch and roll.
  • We added the sides of the IRM and the IM OSEMs, cabled the OSEMs, and adjusted everything to get good lateral and in/out alignment of the OSEMs.
  • Hirata-san organized getting the LBB damper rings into the SR3 tank. He joined the halves of the Cu and magnet rings and got them ready for craning (which will happen later when we have rebuilt the SR3 IP and have somewhere to park the lid of the vacuum chamber). However he encountered a problem with the top ring: one of the screw holes in the top of the tank is not fully threaded, so one of the pillars to support half of the ring cannot be attached. He is considering various options.

Plan for week of 5/28

  • Mark, Enzo at Kamioka Mon-Fri.
  • Hirata-san at Kamioka Tue-Fri. (Mon is monthly Mitaka day.)
  • Kozu-kun at Kamioka Mon only. (Rest of week is job interviews.)
  • TBD.

Plan for week of 6/4

  • Mark, Enzo, Hirata-san, Kozu-kun at Kamioka Tue-Fri. (Mon is medical checkup at Mitaka.)
  • TBD.

To-Do Lists, Schedule

Vacation Info

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-09-02 09:11:42 by fabian.arellano)