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Field modeling. J. Nelson 2/2/05 Tracking support meeting. Since we last met. Put out action items Please send comments and corrections. More progress. Francisco will be liaison with Bob Wands on modeling

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field modeling

Field modeling

J. Nelson


Tracking support meeting

since we last met
Since we last met
  • Put out action items

      • Please send comments and corrections
more progress
More progress
  • Francisco will be liaison with Bob Wands on modeling
    • Bob well on the way to a variable slots model
      • Gets rid of one functional B-B’ mapping for variable gaps
    • Strategizing on the end effects model
      • Geometry limited by number of elements
      • Talking with Bob about
        • Partial slots and gap
        • Gap & no slots
        • Fall back position is no gaps & no slots
          • Would need to treat the end model as a correction to original
    • Need to spec the conductor path in ISM gap
      • JKN & Francisco
      • Useful for mass distribution in the new geometry too
      • (see next page)
bfield interfaces
Bfield interfaces
  • Talked to Robert…
  • Put in Jeff’s variable gap B -> B’ with parameters
  • Put in Jeff’s B-H variation model (also B->B’) with parameters for all plates
  • Plane by plane overall scale factors
    • Will eventually be results of
      • Bdot correction * Bdot calibration * global correction
      • 1st is the hysteresis data from the bdot system
      • 2nd is the channel-to-channel calibration of the bdot ADCs
      • 3rd muon calibration for the SM1/SM2/ND from range vs curvature
  • Put in Erik’s collar and coil models with parameters
  • Provision for Robert’s field admixture model for effects
  • Need to have plate-by-plate B->B’ mappings for B-H curve corrections
    • Eventually interface to DB table for B-H and construction information about what heat is were in a plane
  • Provision for modeling the air field in the SM gap in 6cm planes of air
    • Is this easy ???
bdot system
Bdot system
  • Coordination meeting on Tuesday
    • Francisco has verified the can use same code for ND & FD coil control (life gets easier)
    • Bench test up an running at W&M
    • Keith (W&M UG), Francisco, and Jason Koskinen working on merging various code
      • Jason’s revisions to output table and timing
      • Jason’s input table methods
      • Keith’s drift calibration and current limiting code
      • Francisco on debugging some hardware at Soudan (time outs)
      • Francisco bench verification of signal
    • Goal is to converge by end next week
    • Some longer term items (ADC calibration, client server)
  • Running now requires a few days without beam to attempt to run
    • Test and them optimize run (currently 4 hours per loop)
      • A few days or ~4 runs
    • Collect production data (few hours per SM)
  • FD polarity put back to normal yesterday
  • ND magnet ran for many hours without problem
    • Only waiting on ND switch control with Bdot for bdot running
    • System fine for normal operations