Differences between revisions 138 and 139
Revision 138 as of 2017-04-21 13:31:01
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Editor: MarkBarton
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Revision 139 as of 2017-04-27 15:53:11
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Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
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 * Realized that the SF/BF/... section doesn't need 6 kg added, it needs 6 kg ''removed'', but none to remove. The 20 kg extra in the BF to match the SF GAS filter makes the whole chain overload the PI GAS filter.
 * Lifted the SF/BF/... section to check for net weight and balance. Was 307 kg (cf. G&M's measurement of 301 kf in 2012 for the F0). Can be balanced with only 63 g extra.
 * Went to build up the LBB blade units but discovered that the holes in the base of the blades are two small (are Ø11 mm; should be Ø12 MM). 3D CAD was correct - error was in the 2D drawing. Shipped the blades away for modification.
 * Tested the SF LVDT actuation and worked on debugging it. Still not working.
 * Prepared the PI for being lifted, and the top of the assembly frame for receiving it.
 * Searched for and found the old PI-SF rod.
 * Did safety improvements after Enzo hit his head on a flange bolt: reversed all the bolts on the ±X sides of the BS and put caution tape on them.
 * Debugged Kokeyama-san's changes to the real-time model for the DIO, and started on TFs to check the output filter compensation is working.
 * Craned in the PI.
 * Assembled the thrust bearing holder that receives the PI-SF rod. (It originally had a burr that prevented the bearing from seating properly, and so required filing and re-cleaning.)
 * Hooked the SF and lowered the jacks under the SF to suspend the SF/... section.
 * The top filter rose when unlocked, and required about 1.8 kg to send it back down. Therefore we may be OK - the top filter seems to have about 8 kg more capacity than as measured by G&M. The hex cable clamp (≈0.25 kg) and the cables between the PI and SF still have to be added, but we can get an extra 3 kg by removing one of the three Cu damper segments (and rearranging the other two).
 * Built and installed three LBB blade units.
 * Kept debugging the SF LVDT. We repaired several broken wires, but it's still not behaving correctly.
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Week of 4/24 (four-day week):
 * Crane in PI.
 * Connect SF/BF... section and see if we're indeed overweight and by exactly how much.
 * Finish debugging SF LVDT actuation.
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Week of 5/8:
 * Work from Tuesday.
 * Remove PI temporarily.
 * Add magnets to upper SF damper ring.
 * Reinstall PI with damper ring.
 * Reinstall PI-SF rod, this time with hex cable clamp.
 * Install PI yaw stepper.
 * Wire up PI yaw and vertical steppers.
 * Route cables from SF to PI (may involve removing part of Cu damper).

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, Perry, Hirata-san):

  • Craned in the PI.
  • Assembled the thrust bearing holder that receives the PI-SF rod. (It originally had a burr that prevented the bearing from seating properly, and so required filing and re-cleaning.)
  • Hooked the SF and lowered the jacks under the SF to suspend the SF/... section.
  • The top filter rose when unlocked, and required about 1.8 kg to send it back down. Therefore we may be OK - the top filter seems to have about 8 kg more capacity than as measured by G&M. The hex cable clamp (≈0.25 kg) and the cables between the PI and SF still have to be added, but we can get an extra 3 kg by removing one of the three Cu damper segments (and rearranging the other two).

  • Built and installed three LBB blade units.
  • Kept debugging the SF LVDT. We repaired several broken wires, but it's still not behaving correctly.

Plan for coming weeks

For more detail, see KAGRA/Subgroups/VIS/TypeB/ToDo.

Week of 5/1:

  • No activity (Golden Week).

Week of 5/8:

  • Work from Tuesday.
  • Remove PI temporarily.
  • Add magnets to upper SF damper ring.
  • Reinstall PI with damper ring.
  • Reinstall PI-SF rod, this time with hex cable clamp.
  • Install PI yaw stepper.
  • Wire up PI yaw and vertical steppers.
  • Route cables from SF to PI (may involve removing part of Cu damper).

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-06-24 12:23:36 by fabian.arellano)