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MICE Target Modelling

MICE Target Modelling. Ben Shepherd February 2011. 2D Modelling. A 2d axisymmetric model takes seconds to run (compared to hours for a 3d model) Limitations: PMs modelled as rings (not 8 wedges) Can’t introduce an offset. 3D and 2D models. Results – 2D model.

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MICE Target Modelling

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  1. MICE Target Modelling Ben Shepherd February 2011

  2. 2D Modelling • A 2d axisymmetric model takes seconds to run(compared to hours for a 3d model) • Limitations: • PMs modelled as rings (not 8 wedges) • Can’t introduce an offset

  3. 3D and 2D models

  4. Results – 2D model y is the distance between bottom edge of PM and bottom edge of coils Force evaluated at r = 8mm, 0.5mm away from PM outer edge Maximum force: 52.0N at y=9mm

  5. Effect of increasing PM size PM outer radius: 7.5mm PM outer radius: 8.6mm

  6. PM size variation results 15mm diameter  16mm diameter: 22% increase (52.0N  63.5N) PS claims a 6% increase in mass (here, page 14) but I’m not sure of the derivation

  7. Effect of increasing coil size Coil outer radius: 15mm Coil outer radius: 25mm

  8. Coil size variation results We see a ‘saturation’ effect at large radii Force is increased by 18% at r = 25mm (relative to 15mm)

  9. Adding steel bobbin • Added steel cylinder (0.3mm thick) to inside of coils • Shunts some of the field produced by the coils • Reduces force by ~33% • (In reality, mild steel used with low µ - so would be OK)

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