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 * Spectra analysis of Oplev.

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

  • Realign OL.

  • Cover OL with foil.
  • Offload IP P&Y offsets to picos.

  • Diagonalize OL.
  • Spectra analysis of Oplev.
  • Design, install angular lock servo using OL.
  • Adjust gains and debug damping for IM OSEMs and GAS LVDTs.
  • Calibrate IP LVDT actuation against IP LVDT sensing.(Klog 3553? http://klog.icrr.u-tokyo.ac.jp/osl/?r=3553)

  • Spectra analysis of PI sensors (PI LVDTs and Geophones).
  • Design PI Sensor blending filter.
  • Subtract DC level of Geophones.
  • Modify IP LVDT damping filters to include set point.
  • Calibrate IP LVDT sensing against IP LVDT actuation, IP FRs.
  • Set all EQ stops to TBD clearance.
  • Measure IP period; adjust ballast mass.
  • TFs.


  • Move stuff out of PR2 area.
  • Tidy/label parts.
  • Move safety bars from BS AF area to SR2 area.
  • Close hole in floor above BS AF area.


  • Update real-time model to number channels from #0.
  • Do better interface to IP steppers (make a wrapper for Miyo-kun's driver which includes geometry matrix).
  • Sort out SVN.
  • Add support for comments to SUMCON.
  • Create SUMCON model with values commented.

Medm screens

  • Remove old OL stuff; add link to new OL stuff.
  • Remove unused screens.

Documentation and Operation Manual

  • Publish matrices for IP FRs.
  • Publish matrices for BS PI sensors v4.
  • Finish Foton operation Manual.
  • Complete MEDM operation Manual.
  • Pico Motor operation Manual.
  • Add useful info from Enzo's notebook to BSData.


  • Finalize redesign of IP yaw adjuster.
  • Design better F0 FR adjuster.
  • Design LBB ballast mass.

Tasks Not To Forget

Major Tasks

  • Wipe any rust from around IP LVDTs.
  • Update circuit diagram.
  • (Time permitting) Try adding mass to IP.
  • 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).
  • Figure out how to make PI yaw adjustment reliable.

Minor Tasks


  • Put pointy-tipped screw in RM trolley for BS
  • Return/replace borrowed parts:
    • Temporary ballast mass (dog clamps) in BF.


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)