Differences between revisions 167 and 169 (spanning 2 versions)
Revision 167 as of 2017-10-24 17:57:30
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Editor: EnzoTapia
Revision 169 as of 2017-10-25 09:10:35
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Editor: EnzoTapia
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 * Calibrate IP FR actuation against IP LVDT sensing.  * --(Calibrate IP FR actuation against IP LVDT sensing.)--
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 * Derive matrices for IP FRs.  * --(Derive matrices for IP FRs.)--

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

  • Borrow portable hard drive.

  • Remove sticker residue and permanent marker writing on PI.

  • Fix broken and unreliable connections on IP LVDTs.

  • Reconfigure the stepper motor cables for Miyo-kun.

  • Wipe any rust from around IP LVDTs.
  • (If Enzo thinks it necessary and there's time) adjust IP LVDT mechanical offsets to maximize usable range and recalibrate.
  • Add IP LVDT gains and offsets to IP_LVDTINF filter blocks.

  • Calibrate IP LVDT actuation against IP LVDT sensing.
  • Install damping filters for IP LVDTs.

  • Adjust gains and debug damping for IM OSEMs and GAS LVDTs.
  • Modify IP LVDT damping filters to include set point.
  • Install and debug IP LVDT and geophone diagonalization matrices.

  • (Time permitting) Try adding mass to IP.
  • Work with alignment team.
  • Work with Mirapro on SR LBB and tank installation (Hirata-san, from Wed)
  • Work with Miyo-kun to get user interface for stepper motors.
  • Calibrate IP FR actuation against IP LVDT sensing.

  • SR procurement.
  • Lower LBB by 17.5 mm; suspend and rebalance after removing table KOACH filters.

  • Reroute cable to eliminate need for fifth feedthrough.

  • Set all EQ stops to TBD clearance.
  • Measure IP period; adjust ballast mass.
  • Calibrate IP LVDT sensing against IP LVDT actuation, IP FRs.
  • TFs.


  • Move stuff out of PR2 area.
  • Tidy/label parts.
  • Move safety bars from BS AF area to SR2 area.
  • (Put up safety bars in SR3 area.)
  • Close hole in floor above BS AF area.


  • Enter new IP matrices and do safe.snap.

  • Send stepper driver info to Miyo-kun.

  • Update real-time model to number channels from #0.
  • Remove old OL stuff; add link to new OL stuff.
  • Remove unused screens.
  • Sort out SVN.
  • Add support for comments to SUMCON.

  • Create SUMCON model with values commented.
  • Derive matrices for IP FRs.


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

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).
  • 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)