Differences between revisions 120 and 156 (spanning 36 versions)
⇤ ← Revision 120 as of 2017-01-27 13:28:23 →
Size: 1613
Editor: MarkBarton
Comment:
← Revision 156 as of 2017-06-09 13:44:22 → ⇥
Size: 2763
Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
Line 5: Line 5:
 * Hirata-san:
  * Received many parts from i-ject for BFRM (took pictures and took them into ATC cleanroom).
  * got quotes for PRM/SRM payload from i-ject.
  * Checked quotes and asked for some modifications.)
  * Washed parts (parts for type-A, small hexagons, screws, etc\)
  * Wiped 9 piano wires and sent to Kamioka for PR.
  * pdated Fabian's EQstop parts for BS recoilmass and updated EQstop assy drawings.
 * Fabian
  * Worked out geometry for blade adjustment.
  * Designed additional ballast masses for BS BF (and SR).
 * Mark and Enzo (at Kamioka)
  * Did two rounds of adjustment of the blades with help from Takahashi-san (one for position, one for frequency)
  * Surveyed the position of the rod using the vertical mode of the bubble level.
  * Got apparent improvement as judged at the IRM-IM EQ stops (but still not perfect).
  * Did one more round of blade adjustments (without Takahashi-san)
  * Got good agreement with IRM-IM EQ stops, so put BF cap on and raised the whole system to check for balance.
  * Found balance still fairly bad: about the same on the -X,+Y diagonal and about half on the +X,+Y diagonal (70 and 30 mm worth of motion of a single trim mass respectively; previous a bit over 70 mm each).
  * From the imbalance torques, calculated the offset of rod as 2.3 mm in the direction 22 degrees to the +X side of -Y.
  * Calculated the blade adjustments required: {-0.325194, -1.79175, 2.11695} mm
  * Prepared to apply adjustments (removed cap etc).		 === Type B (Mark) ===
==== Past week report ====
At Kamioka (Mark, Fabian, Enzo, Hirata-san):
 * Hirata-san and Mark reversed the support ring for the LBB damper to match the reversed suspension.
 * Hirata-san did a trial assembly of the magnet ring for the LLB damper and placed magnets on it with the template.
 * Hirata-san and Mark put the base pieces for the Cu ring in the chamber. However it turns out that the holes for attaching the joint pieces are incompletely threaded and we will have to run a tap through them.
 * We tested the geophones. At first one didn't work at all. This turned out to be a broken wire in one of the in-vacuum adapter cables. For the test we replaced the adapter with an old-style one (and removed the matching descrambler). A second geophone mostly works but saturates at a suspiciously low number of counts at the ADC (2000 instead of 20000).
 * We tested the PI horizontal LVDTs. The #1 (H2) one works but cable swaps showed that #0 and #2 have issues both at the tank end and at the card.
 * We decided on a final location for the stepper and pico drivers on the second floor. We moved the cables for the stepper drivers (using the outside cable trays) and laid new LAN and AC cables for the picos.
 * We recounted the used and spare cables now that the in-vacuum cabling appears to be final.

==== Plan for coming weeks ====
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]].

Week of 6/12:
 * Cabling:
  * Debug/fix PI vertical LVDTs #0 and #2.
  * Calibrate PI vertical LVDT.
  * Debug/fix geophone #1.
  * Set yoke on PI vertical LVDT (if necessary).
  * Cable and test PI yaw stepper.
  * Cable and test PI vertical stepper.
  * Cable and test PI horizontal steppers.
  * Cable and test PI horizontal LVDTs.
  * Calibrate PI horizontal LVDTs.
 * Prepare LBB.
  * Attach LBB outriggers and rod receptacles.
 * Prepare LBB Cu ring.
  * Remove from tank, fix incompletely threaded holes, reinstall in tank.
  * Lay down spacers to protect magnets (in next step).
 * Prepare LBB magnet ring.
  * Disassemble.
  * Pass pieces into tank.
  * Reassemble on top of Cu ring.
 * Install LBB damper.
  * Bind LBB damper rings together with slings.
  * Remove vacuum tank lid and ring.
  * Crane rings up to install height, hook LBB magnet ring and support LBB Cu ring by TBD method.
 * Crane suspension into tank.
 * Hook LBB Cu ring.
 * Hook LBB.
 * Crane vacuum tank lid+ring black on.
 * Remove vacuum tank lid (only).
 * Remove port covers where feedthroughs will go, move feedthroughs from assembly frame and install on vacuum tank ring.
 * Reconnect in-air cables.

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, Hirata-san):

  • Hirata-san and Mark reversed the support ring for the LBB damper to match the reversed suspension.
  • Hirata-san did a trial assembly of the magnet ring for the LLB damper and placed magnets on it with the template.
  • Hirata-san and Mark put the base pieces for the Cu ring in the chamber. However it turns out that the holes for attaching the joint pieces are incompletely threaded and we will have to run a tap through them.
  • We tested the geophones. At first one didn't work at all. This turned out to be a broken wire in one of the in-vacuum adapter cables. For the test we replaced the adapter with an old-style one (and removed the matching descrambler). A second geophone mostly works but saturates at a suspiciously low number of counts at the ADC (2000 instead of 20000).
  • We tested the PI horizontal LVDTs. The #1 (H2) one works but cable swaps showed that #0 and #2 have issues both at the tank end and at the card.
  • We decided on a final location for the stepper and pico drivers on the second floor. We moved the cables for the stepper drivers (using the outside cable trays) and laid new LAN and AC cables for the picos.
  • We recounted the used and spare cables now that the in-vacuum cabling appears to be final.

Plan for coming weeks

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

Week of 6/12:

  • Cabling:
    • Debug/fix PI vertical LVDTs #0 and #2.
    • Calibrate PI vertical LVDT.
    • Debug/fix geophone #1.
    • Set yoke on PI vertical LVDT (if necessary).
    • Cable and test PI yaw stepper.
    • Cable and test PI vertical stepper.
    • Cable and test PI horizontal steppers.
    • Cable and test PI horizontal LVDTs.
    • Calibrate PI horizontal LVDTs.
  • Prepare LBB.
    • Attach LBB outriggers and rod receptacles.
  • Prepare LBB Cu ring.
    • Remove from tank, fix incompletely threaded holes, reinstall in tank.
    • Lay down spacers to protect magnets (in next step).
  • Prepare LBB magnet ring.
    • Disassemble.
    • Pass pieces into tank.
    • Reassemble on top of Cu ring.
  • Install LBB damper.
    • Bind LBB damper rings together with slings.
    • Remove vacuum tank lid and ring.
    • Crane rings up to install height, hook LBB magnet ring and support LBB Cu ring by TBD method.
  • Crane suspension into tank.
  • Hook LBB Cu ring.
  • Hook LBB.
  • Crane vacuum tank lid+ring black on.
  • Remove vacuum tank lid (only).
  • Remove port covers where feedthroughs will go, move feedthroughs from assembly frame and install on vacuum tank ring.
  • Reconnect in-air cables.

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