H - Electricity – 01 – J
Patent
H - Electricity
01
J
353/14, 313/28
H01J 3/26 (2006.01) G21K 1/093 (2006.01) H05H 9/00 (2006.01)
Patent
CA 1143839
TITLE A TWO MAGNET ASYMMETRIC DOUBLY ACHROMATIC BEAM DEFLECTION SYSTEM INVENTOR Ronald M. Hutcheon ABSTRACT OF THE DISCLOSURE The beam deflection system includes two dipole magnets for deflecting a charged particle beam in a deflection plane. The first magnet bends the beam in a path having a radius P1 and a deflection angle .theta.1 greater than 180°. The first magnet has an effective exit edge at an angle (90° - ?1) with respect to the beam path. The second magnet further bends the beam in a path having a radius P2 and a deflection angle .theta.2 where 225° ? (.theta.1 + .theta.2) ? 280°. The effective entry edge of the second magnet is at an angle of (90° - ?2) to the beam path. In the usual practical case the effective interior edges of the two magnets are roughly parallel, that is, ?1 ? -?2 and the doubly achromatic properties are obtained to first order when the angles satisfy the following formula: ?1 ? -?2 2?2 ? .theta.2 -(.theta.1 - 180°), and when the distance D between the effective edges of the two magnets is set so that the dipoles produce equal beam dispersion in the drift distance between them. For the case of 270° total bend with P2 = P1 this occurs at a distance D, given by Image .
353640
Her Majesty In Right Of Canada As Represented By Atomic Energy O
Hutcheon Ronald M.
Rymek Edward
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