Eddy currents in accelerator magnets

Details Eddy currents in accelerator magnets Eddy currents in accelerator magnets

2011-03-09

arxiv.org/abs/1103.1800v1

CERN-2010-004, pp. 103-140

Physics

Accelerator Physics

38 pages, presented at the CERN Accelerator School CAS 2009: Specialised Course on Magnets, Bruges, 16-25 June 2009

Scientific paper

This paper covers the main eddy current effects in accelerator magnets - field modification (time delay and field quality) and resistive power losses. In the first part, starting from the Maxwell equations, a basic understanding of the processes is given and explained with examples of simple geometry and time behaviour. Useful formulas are derived for an analytic estimate of the size of the effects. In the second part the effects in real magnets are analysed and described in comparison with numerical and measured results. Finally, based on the previous parts, design recommendations are given regarding how to minimize eddy current effects.

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