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- B. Auchmann, S. Russenschuck, R. de Maria
CERN, Geneva
- S. Kurz
Robert Bosch GmbH, Frankfurt
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The simulation of pulsed superconducting magnets has gained importance at the verge of fast-ramping cyclotron projects. The ROXIE program has been devised for the design and optimization of superconducting magnets. The 2-D electromagnetic model of a fast-ramping magnet in ROXIE consists of- a representation of strands by line currents,
- a coupling of the finite element method and the boundary element method to take into account the field contribution of the magnet yoke, as well as eddy-current effects in conductive bulk material,
- a model for persistent currents,
- a model for inter-filament coupling currents, and
- a model for inter-strand coupling currents in Rutherford-type cables.
We will present the coupling of all these effects in the mathematical framework of the theory of discrete electromagnetism. We will then proceed to demonstrate how the coupled approach helps to understand a pulsed magnet's behavior. Each of the above effects leaves an identifiable signature in the measured field quality and contributes to the losses. With ROXIE, we can trace measurements to their origin and make predictions based on experience and simulation.
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Slides
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