Mehrpolige magnetische Linse zur Manipulation eines Ladungsträgerstrahls

Lentille magnétique multipolaire pour manipuler un faisceau de particules chargées

Multipole magnetic lens for manipulating a beam of charged particles

Abstract

A multipole magnetic lens for manipulating a beam of charged particles traveling along an optical axis, the lens comprising: - Magnetic field generating means, for generating a magnetic field; - A magnetic yoke, comprising a plurality of radial yoke portions disposed about said optical axis so as to guide and concentrate said magnetic field toward an interaction region proximal to the optical axis, wherein: - Said yoke has a composite structure, comprising an outer primary portion and an inner secondary portion; - Said secondary portion is mounted as a monolithic insert within said primary portion so as to be disposed around said interaction region; - Said secondary portion comprises a plurality of yoke stubs that are arranged around said optical axis and that are rigidly interconnected by a connecting structure such that: ▪ Said yoke stubs align up and match with said radial yoke portions; ▪ Said connecting structure acts as a magnetic constriction, configured such that said magnetic field undergoes saturation therein, thereby causing magnetic flux to exit the yoke stubs and form a multipole field in said interaction region.

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Cited By (0)

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