Differences between revisions 187 and 198 (spanning 11 versions)
⇤ ← Revision 187 as of 2017-09-08 13:41:35 →
Size: 1973
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, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun):
 * We craned out the SF temporarily and retrieved the lost PEEK cable clamp collet from the BF.
 * We installed the BF.
 * We routed cables from the BF via the hex cable clamp to the SF level.
 * We adjusted the BF trim mass for pitch, roll and vertical, and got the IRM hanging symmetrically around the IM.
 * We adjusted all the IRM OSEMs laterally and in/out.
 * We calibrated the SF LVDT and tested the SF FR stepper.
 * We suspended the SF/... section and weighed it but found the old 7-mm maraging rod adapter did not hold it at the center, so we chad to lift it with slings and could not accurately trim it for pitch/roll.
 * We craned in the PI with the SF damper ring hanging from it.
 * We suspended the SF successfully from the PI and unlocked the F0 keystone to check the mass budget. We needed about 1.5 kg extra, which is about right.
 * However we had to leave out the F0-SF hex cable clamp because of a bad thread on the inside of the cap. Hirata-san will make a new cap by enlarging the 7-mm hole in an old cap to 8 mm.		 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 19: Line 25:
==== Plan for week of 9/4 ====
Mark, Fabian, Enzo (Tue-Fri), Ohishi-san, Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun (Thu, Fri)
 * Retrieve PEEK piece from BF.
 * Crane SF back in.
 * Suspend BF/IRM/IM/RM/BS.
 * Test SF FR.
 * Calibrate SF LVDT.
 * Install SF cap; route cables.
 * Lift and weigh SF/BF/IRM/IM/RM/BS.
 * Adjust SF ballast.		 ==== 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 30: Line 36:
==== Plan for week of 9/13 ====
Mark (except Wed), Fabian (except ASJ), Enzo, Ohishi-san, Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun
 * Prepare magnet ring.
 * Bring in PI.
 * Route cables.
 * Suspend SF/..., adjust tilt of SF and total mass.
 * Adjust damper gap.
  		 ==== Plan for week of 10/16 ====
Kamioka: all but Mark, Hirata-san
Mitaka: Hirata-san
 * Work with alignment team.
 * SR procurement

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)