Differences between revisions 187 and 188
Revision 187 as of 2018-03-02 15:30:05
Size: 3017
Editor: MarkBarton
Revision 188 as of 2018-03-07 11:43:36
Size: 3035
Editor: MarkBarton
Deletions are marked like this. Additions are marked like this.
Line 26: Line 26:
  * Remove non-vacuum-compatible ballast from LBB.
  * Check for lost tools.
  * --(Remove non-vacuum-compatible ballast from LBB.)--
  * --(Check for lost tools.)--
Line 30: Line 30:
  * Add screws to cables at PR2 feedthroughs.   * --(Add screws to cables at PR2 feedthroughs.)--

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


Pumpdown Prep

  • Prepare BS Chamber
    • Remove non-vacuum-compatible ballast from LBB.

    • Check for lost tools.

    • Wipe down all accessible areas inside tank with Vector Alpha wipes and ethanol.
  • Help Type Bp Team
    • Add screws to cables at PR2 feedthroughs.

Main Assembly Sequence

  • Necessary for phase-I★★★
    • Modify IP LVDT damping filters to include set point.

    • TFs.


    • Check IP BIO is working or not.
  • Necessary for phase-II★★
    • Calibrate IP LVDT actuation against IP LVDT sensing. (Klog 3553? http://klog.icrr.u-tokyo.ac.jp/osl/?r=3553)

    • Design PI Sensor blending filter.
    • Re-calibrate F0 GAS LVDT
    • Tune the LVDT sensitivity
    • Measure IP period; adjust ballast mass.
  • At some point (remotely)★
    • Improve OL offloading.
    • Improve GAS offloading.
    • Spectral analysis of Oplev.
    • Design, install angular lock servo using OL. (Almost done for phase-I)
    • Adjust gains and debug damping for IM OSEMs and GAS LVDTs. (Almost done for phase-I)
    • Subtract DC level of Geophones.
    • Spectra analysis of PI sensors (PI LVDTs and Geophones).
    • Calibrate IP LVDT sensing against IP LVDT actuation, IP FRs.
    • Set all EQ stops to TBD clearance.
    • Modify the model for IP coil driver control

Documentation and Operation Manual

  • Add useful info from Enzo's notebook to BSData.

Tasks Not To Forget

Major Tasks

  • Move safety bars from BS AF area to SR2 area.
  • Close hole in floor above BS AF area.
  • 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.

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