Differences between revisions 119 and 120
Revision 119 as of 2017-08-29 11:03:13
Size: 4274
Editor: MarkBarton
Revision 120 as of 2017-09-01 09:08:57
Size: 4280
Editor: EnzoTapia
Deletions are marked like this. Additions are marked like this.
Line 92: Line 92:
 * Rewire PI horizontal steppers with vacuum-compatible cable.  * --(Rewire PI horizontal steppers with vacuum-compatible cable)--.

VIS Type B BS Near Term To-Do List

Archived BS To-Do Items

SR To-Do Items

Every Week

Coming Weeks

Preparation for Real BS Hang

Every Week


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



  • Update BS Install Procedure with screenshots from new on-assembly-frame 3D CAD.

Main Assembly

  • Wrap new IM bottom ballast masses (Mozumi).

  • Install new IM masses.

  • Set up optical level.

  • Adjust IM ballast mass to give desired roll/pitch/vertical.

  • Level BF.

  • Cable BF LVDT, test and calibrate.

  • Adjust top of IRM to level.

  • Install IRM side panels.

  • Install IRM OSEMs.

  • Cable IRM OSEMs and test.

  • Adjust IRM and IRM OSEMs to get good alignment of IRM OSEMs and IM-IRM stops.

  • Add extra ballast mass to BF.
  • Add BF cap but don't anchor cables.
  • Cable and test BF cap picos.
  • Lift BF/IRM/IM/RM/BS and weigh.
  • Adjust BF ballast if necessary.
  • Crane in SF.
  • Hook up BF/IRM/IM/RM/BS.
  • Route cables up to SF.
  • Adjust BF ballast if necessary.

Time permitting

  • Lay more new in-air cabling.

Real BS Hang Tasks

Major Tasks

  • Finish assembly drawing for LBB and LBB damper ring and post on JGWDoc (Hirata-san).
  • Get pico drive screens fixed (Miyo-kun)
  • Final ballast mass production for BF and SF (Hirata-san).

  • Design of receptacles for rods with 8 mm heads.

  • Possible rebuild of BF

    • Set up build/test stand for filters.

    • Get filter test weights.

    • Find spare BF blade(s).

  • Reclean stuff:
    • PI (remove Kapton tape etc, etc).
    • LLB damper stuff, especially Cu segments.
  • Calibrate SF LVDT.
  • Calibrate PI vertical LVDT.
  • Set yoke on PI vertical LVDT (if necessary).
  • Calibrate PI horizontal LVDTs.

Minor Tasks


  • Get clean bag laundered.
  • Put pointy-tipped screw in RM trolley for BS
  • Swap out temporary ballast mass in BF, SF.

  • Return/replace borrowed parts:
    • Lock washers for LBB dampers
    • Temporary ballast mass (dog clamps) in BF.
    • Wide-mouth OSEMs from RM to Akutsu-san

  • Adjust height of crossbars below BF.

  • If possible, fix galled pole in BF level of EQ stop.

  • Swap in new F0-SF maraging rod (with 8-mm heads) and new receptacles to match.
  • Check inside SF for lost ruler.

  • Tighten PI yaw return spring.
  • Get Cu O-rings for feedthroughs.


  • 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

  • Remove cling wrap in BF and install vacuum-compatible heat shrink.

  • Remove cling wrap on connections for PI vertical stepper and install vacuum-compatible heat shrink (needs wider diameter heat shrink or smaller pins).
  • Rewire PI horizontal steppers with vacuum-compatible cable.

  • Adjust yoke on BF to put top of secondary at 3.5 mm above top of baseplate (or to give ≈0 counts at nominal height).
  • Adjust yoke on SF to put top of secondary at 6 mm above top of baseplate (or to give ≈0 counts at nominal height).
  • 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.
  • Create a proper DAC Monitor MEDM screen.
  • Improve ADC Monitor MEDM screen.

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