Title: A theory on obtaining short bursts of ions from a beam of ions
Abstract: Many modern-day experiments in nuclear physics, particularly neutron physics, require short duration bursts of ions whose definition in energy and angle correspond to an ion beam of rather high quality. This paper treats the problem of producing bursts of ions by beam sweeping across an aperture. By considering several examples of electric-field sweeping, it is shown that (a) an essential equivalence exists between different time-varying wave forms that may be employed, (b) that the beam quality, as measured by energy and/or angular spread, is necessarily diminished in the process of burst production. In a general way it is shown that if a steady “monoenergetic” beam, characterized by y-component of momentum spread ΔPy and object size Δy, is chopped by beam sweeping, then there is a relation which in its simplest form is given by ΔEΔt=ΔPyΔy. In this relation ΔE is the energy that must be introduced into a monoenergetic beam in order to produce bursts as short as Δt. Finally, it is shown that beam bunching results in diminished beam quality. An example is klystron bunching of a nearly parallel pulsed beam. In this case there is a relation, the simplest form of which is ΔEaΔta=ΔEbΔtb relating the product ΔEΔt before bunching to that which exists after bunching.
Publication Year: 1960
Publication Date: 1960-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 72
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