| 摘要 |
The present invention provides an apparatus for acting upon charge particles in dependence upon on or more parameters including mass and/or energy and/or charged state of the particles. The apparatus includes an array of elongate magnetic poles extending longitudinally in an elongation direction of the array; an array reference surface extending in the array elongation direction and passing through the array with a magnetic pole on each side of the reference surface; a means for providing charged particles entering into or originating in the field of the magnetic pole array. The magnetic poles are configured in a plane perpendicular to the elongation direction to give parameter dependent change of direction to charged particles moving in array with a direction of movement substantially parallel to the reference surface, whereby parameter dependent selection of charged particles may be achieved by parameter dependent dispersion in a plane transverse to the reference surface.
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