Differences between revisions 138 and 197 (spanning 59 versions)
⇤ ← Revision 138 as of 2017-04-21 13:31:01 →
Size: 1667
Editor: MarkBarton
Comment:
← Revision 197 as of 2017-10-06 13:45:39 → ⇥
Size: 2477
Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
Line 7: Line 7:
At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): At Kamioka (Mark, Ohishi-san, Fabian, 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.
 * 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 24:
 * 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. 		==== Plan for week of 10/2 ====
 * Design ballast for LBB.
 * Design improved PI yaw adjustment.
 * SR procurement.
Line 18: Line 29:
==== Plan for coming weeks ====
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]].		 ==== 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.
Line 21: Line 37:
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.		 ==== Plan for week of 10/16 ====
Kamioka: all but Mark
 * Work with alignment team.
Line 26: Line 41:
Week of 5/1:
 * No activity (Golden Week).		 ==== 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, Fabian, 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.
  • 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 10/2

  • Design ballast for LBB.
  • Design improved PI yaw adjustment.
  • SR procurement.

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.

Plan for week of 10/16

Kamioka: all but Mark

  • Work with alignment team.

Vacation Info

Mark: 10/16-24

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