Differences between revisions 131 and 132
Revision 131 as of 2017-09-14 12:15:31
Size: 3754
Editor: MarkBarton
Revision 132 as of 2017-09-14 12:23:18
Size: 3760
Editor: MarkBarton
Deletions are marked like this. Additions are marked like this.
Line 26: Line 26:
 * --(Remove F-0 rod and reinstall with hex cable clamp.)--  * --(Remove F0-SF rod and reinstall with hex cable clamp.)--
Line 32: Line 32:
 * --(Recheck/adjust SF/... yaw.)--
Line 34: Line 35:
 * Check F0 yoke height (top of coil former should be 6 mm above top of baseplate).
Line 45: Line 47:
Line 72: Line 73:
 * Calibrate PI vertical LVDT.
 * Set yoke on PI vertical LVDT (if necessary).
 * Calibrate PI horizontal LVDTs.

VIS Type B BS Near Term To-Do List

Archived BS To-Do Items

SR To-Do Items

Every Week

Coming Weeks

Every Week


  • Vacuum and roll floor.
  • Wipe ladders.
  • Tidy tools, parts.
  • Get stuff from ../WishList


Main Assembly Sequence

  • Debug BF LVDT actuation.
  • Debug other actuation.

  • Remove F0-SF rod and reinstall with hex cable clamp.

  • Route cables up past hex cable clamps.

  • Adjust SF trim mass for pitch/roll/vertical.

  • Route all SF/... cables through to the flange and test.

  • Cable all PI items through to the flange.

  • Disconnect the SS from the AF.

  • Recheck/adjust SF/... yaw.

  • Roughly level the PI so as to make the SS vertical.

  • Unlock the IP and adjust the level of the PI and the horizontal FRs to center the IP.

  • Check F0 yoke height (top of coil former should be 6 mm above top of baseplate).
  • Test all PI items:
    • Yaw stepper.
    • F0 LVDT sensing
    • F0 LVDT actuation
    • Horizontal steppers

    • Horizontal LVDT sensing
    • Horizontal LVDT actuation
    • Geophones (except one cable broken: #1)

  • Lock the F0 and SF keystones and measure the resonance frequency of the BF GAS.
  • Lock the F0 and BF keystones and measure the resonance frequency of the SF GAS. 425 mHz

  • Lock the SF and BF keystones and measure the resonance frequency of the F0 GAS.

In parallel, time permitting

  • Fix links to ADC_MONITOR screens.

  • Check that all Take/Restore Safe.snap buttons work.

  • Check that we still have all LBB parts (there was an issue with borrowed lock nuts).

  • Wipe LLB damper parts with ethanol.

  • Figure out how to tighten PI yaw return spring.
  • Install LBB Cu damper ring in tank (less Cu for now).

  • Fix #1 geophone adapter cable.
  • Fix broken pico adapter cable


Main Assembly Sequence


  • BUMAX countersunk screws for LBB Cu (by 9/20)
  • SDC screws for LBB half rings: 9/15 (Fri) (have Ag-coated as backup)
  • LBB Cu segments: 9/19-20

Tasks Not To Forget

Major Tasks

  • Update BS Install Procedure with screenshots from new on-assembly-frame 3D CAD.
  • Finish assembly drawing for LBB and LBB damper ring and post on JGWDoc (Hirata-san).
  • Get pico drive screens fixed (Miyo-kun)

Minor Tasks


  • Get clean bag laundered.
  • Put pointy-tipped screw in RM trolley for BS
  • Return/replace borrowed parts:
    • Lock washers for LBB dampers
    • Temporary ballast mass (dog clamps) in BF.
  • Swap in new F0-SF maraging rod (with 8-mm heads) and new receptacles to match.


  • Decide final in-vacuum and in-air cable routing (Enzo).
  • Calibrate all LVDTs (Enzo, Mark). BF, SF, PI-GAS, PI-H1, PI-H2, PI-H3

  • Adjust yoke on PI to put top of secondary at TBD mm above top of baseplate (or to give ≈0 counts at nominal height).

Real-time and SUMCON models

  • Create SUMCON models for full BS and major installation milestones.
  • Create controls design description (cf LIGO-T1100378).

  • Make table of ADC/DAC assignments and check for consistency with D1503600 and k1visbs (Enzo, Mark)
  • Understand/document/debug Kokeyama-san's DIO stuff.
  • Measure LPCD and HPCD output filter response.
  • Design and install software compensation filters for LPCD and HPCD output filters.
  • Design and install GAS drift compensation filters.

KAGRA/Subgroups/VIS/TypeB/ToDoBS (last edited 2019-01-04 15:21:23 by MarkBarton)