Abstract
A trapping concept for the injected beam in a modified betatron accelerator using a localized inductive electric-field pulse generated by a charged coaxial pulse line is described. The average canonical angular momentum 〈Pθ〉 is not conserved in this scheme. Numerical simulations demonstrate trapping over a wide range of operating parameters. A 0.84 Ω, 45 ns water dielectric pulse line has been built for testing the trapping concept. The pulse line is switched using triggered vacuum surface flashover switches. Test results show that a single bipolar output pulse can be obtained if the pulse line is crowbarred. For 15–40 kV pulses, the observed rise time is roughly 20 ns.
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