Differences between revisions 139 and 198 (spanning 59 versions)
⇤ ← Revision 139 as of 2017-04-27 15:53:11 →
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Editor: MarkBarton
Comment:
← Revision 198 as of 2017-10-06 13:57:53 → ⇥
Size: 2551
Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
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At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): At Kamioka (Mark, Ohishi-san, Enzo, Hirata-san, Yoshioka-kun):
 * We moved or covered stuff in the BS cleanbooth to prepare for the SR2 crane slot cutting and BS-> SR2 assembly frame move.
 * We put the service port covers back on at the BF level of the BS tank.
 * We used the PI jacks to center the bottom of the security structure around the RM.
 * We debugged a mechanical issue where the #2 IP LVDT had too narrow a gap between the moving and fixed parts, so that there was interference with only a very small clockwise yaw of the IP. We fixed it by moving the bottom baseplate (taking advantage of the fact that it was held by screws in oversize holes for this purpose).
 * We used the IP FRs to center the IP.
 * We set the gains on the IP LVDT driver.
 * We tested the picos and most of the steppers. The picos and IP steppers all work nicely. The PI FR and yaw steppers have jamming issues. We haven't tested the BF and SF FR steppers.
 * We debugged an issue with one of the geophones (#1) which has a DC offset. We did cable swaps and determined that the issue is internal to the geophone pod. A second geophone (#2) saturates at a suspiciously small voltage on the negative side. Again the issue is internal.
At Mitaka (Fabian, Hirata-san):
 * Fabian designed an improvement to the PI yaw stepper driver mount to stop the stepper jamming.
 * Fabian worked on a plan to measure the load capacity of the SR PIs.
 * Hirata-san did 2D drawings of the PI for the SR, and of SF2 and SRM in their vacuum chambers.
 * Hirata-san did drawings if the SR LBB damper rings and asked for quotes.
 * Hirata-san asked for quotes for SR secondary wire breakers and SR IM/IRM lock screws
 * Hirata-san ordered SR IM wire clamps.
 * Hirata-san worked on parts lists for SR cable clamps.
Line 9: Line 25:
 * 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 week of 10/10 ====
Kamioka: Mark, Fabian, Enzo, Ohishi-san, Kozu-kun.
Mitaka: Hirata-san
Holiday Mon 10/9, Open Day prep Fri 10/13.<<BR>>
 * Tune IP, do LVDT/stepper calibration.
 * Remove First Contact, try OL.
 * TFs, final preparation for alignment in week of 10/16.
 * SR procurement.
 * Design ballast for LBB.
 * Continue design of improved PI yaw adjustment, also improved F0 FR.
Line 16: Line 36:
==== Plan for coming weeks ====
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]].		 ==== Plan for week of 10/16 ====
Kamioka: all but Mark, Hirata-san
Mitaka: Hirata-san
 * Work with alignment team.
 * SR procurement
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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).		 ==== Vacation Info ====
Mark: 10/16-24

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Past week report

At Kamioka (Mark, Ohishi-san, Enzo, Hirata-san, Yoshioka-kun):

  • We moved or covered stuff in the BS cleanbooth to prepare for the SR2 crane slot cutting and BS-> SR2 assembly frame move.

  • We put the service port covers back on at the BF level of the BS tank.
  • We used the PI jacks to center the bottom of the security structure around the RM.
  • We debugged a mechanical issue where the #2 IP LVDT had too narrow a gap between the moving and fixed parts, so that there was interference with only a very small clockwise yaw of the IP. We fixed it by moving the bottom baseplate (taking advantage of the fact that it was held by screws in oversize holes for this purpose).
  • We used the IP FRs to center the IP.
  • We set the gains on the IP LVDT driver.
  • We tested the picos and most of the steppers. The picos and IP steppers all work nicely. The PI FR and yaw steppers have jamming issues. We haven't tested the BF and SF FR steppers.
  • We debugged an issue with one of the geophones (#1) which has a DC offset. We did cable swaps and determined that the issue is internal to the geophone pod. A second geophone (#2) saturates at a suspiciously small voltage on the negative side. Again the issue is internal.

At Mitaka (Fabian, Hirata-san):

  • Fabian designed an improvement to the PI yaw stepper driver mount to stop the stepper jamming.
  • Fabian worked on a plan to measure the load capacity of the SR PIs.
  • Hirata-san did 2D drawings of the PI for the SR, and of SF2 and SRM in their vacuum chambers.
  • Hirata-san did drawings if the SR LBB damper rings and asked for quotes.
  • Hirata-san asked for quotes for SR secondary wire breakers and SR IM/IRM lock screws
  • Hirata-san ordered SR IM wire clamps.
  • Hirata-san worked on parts lists for SR cable clamps.

Plan for week of 10/10

Kamioka: Mark, Fabian, Enzo, Ohishi-san, Kozu-kun. Mitaka: Hirata-san Holiday Mon 10/9, Open Day prep Fri 10/13.

  • Tune IP, do LVDT/stepper calibration.
  • Remove First Contact, try OL.
  • TFs, final preparation for alignment in week of 10/16.
  • SR procurement.
  • Design ballast for LBB.
  • Continue design of improved PI yaw adjustment, also improved F0 FR.

Plan for week of 10/16

Kamioka: all but Mark, Hirata-san Mitaka: Hirata-san

  • Work with alignment team.
  • SR procurement

Vacation Info

Mark: 10/16-24

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