Differences between revisions 204 and 206 (spanning 2 versions)
Revision 204 as of 2018-11-05 14:37:23
Size: 3893
Editor: MarkBarton
Revision 206 as of 2018-11-05 14:48:04
Size: 4018
Editor: EnzoTapia
Deletions are marked like this. Additions are marked like this.
Line 21: Line 21:
 * Install new yaw pico mechanism (if available).  * Install new yaw F0 stepper mechanism (if available).
Line 24: Line 24:
 * Service geophones (one has high noise, one has DC offset).
 * Re-calibrate F0 GAS LVDT.
 * Confirm the position of the IP-LVDTs and Actuators.
Line 42: Line 45:
  * Re-calibrate F0 GAS LVDT

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

December 2018 vent

  • Install new yaw F0 stepper mechanism (if available).
  • Add more mass to IP to get a lower frequency.
  • Tune LBB (adjust table height, damper height).
  • Service geophones (one has high noise, one has DC offset).
  • Re-calibrate F0 GAS LVDT.
  • Confirm the position of the IP-LVDTs and Actuators.


  • Get picomotor drivers back on line.

  • Debug BS BIO connections, especially PI IP.

Main Assembly Sequence

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

    • TFs.


  • Necessary for phase-II★★
    • Debug BS geophones.
    • Flip circuit boards in BS geophones to make them the same as SRx.
    • 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.
    • 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.

  • 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 temporary ballast mass (dog clamps).

  • Characterize replacement F0.
  • Wipe/clean arc weights that were rained on.


  • Update BS Circuit diagram, D1503600
    • Note removal of LED/PD on TM OSEMs.

    • Organize stepper reset system and watchdog BIO.
    • Include information on assignment of channels to feedthrough positions.
    • Reflect gender-changers and non-flipping feedthrough adapters.
    • Reflect actual cable lengths.
    • Include LVDT pin size (1 mm).
    • Include Stepper pin size (1.6 mm).
    • Undo renumbering of IP items.

    • Page 10: "DIO Card # 0" should be "DIO Card # 1"

    • Include OutConfigBoards on OL page (Sheet 18).

    • Update HPCD section to reflect:

      • All three GAS channels are on HPCD #1 and DIO Card #2, CNB cables, Sheet 13.

      • Three IP channels are on HPCD #0 and DIO Card #2, CNA cables, Sheet 15.

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)