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Proceedings Paper

Curvature of the effective field boundary of realistic sector magnets
Author(s): B. Pfreundtner; Hermann Wollnik
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Paper Abstract

For realistic sector magnets the effective field boundary is not parallel to the pole face boundary since in the corners the longitudinal and the radial fringing fields overlap. Thus the effective field boundary is always curved even if the pole face boundary is straight. This effect is especially large if the magnet air gap is a large fraction of the radius of curvature of the optic axis. It can be reduced, however, by field clamps and is enlarged by Rogowski pole end shapes. To determine the effective field boundary of realistic sector magnets 3D field calculations are necessary. For the present investigation such 3D fields were determined by the surface-charge method with all saturation effects being neglected.

Paper Details

Date Published: 25 September 1995
PDF: 8 pages
Proc. SPIE 2522, Electron-Beam Sources and Charged-Particle Optics, (25 September 1995); doi: 10.1117/12.221583
Show Author Affiliations
B. Pfreundtner, Univ. Giessen (Germany)
Hermann Wollnik, Univ. Giessen (Germany)


Published in SPIE Proceedings Vol. 2522:
Electron-Beam Sources and Charged-Particle Optics
Eric Munro; Henry P. Freund, Editor(s)

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