Field modeling
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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

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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)

Coil exit geometry

Coil Exit Geometry

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

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