Abstract

Pulse compression of intense electron beams ∼340 keV, ∼1 kA, and ∼10 ns) was observed for the following two superconducting ring lenses (supertrons): an already sintered 1 μm sized powder-pressed Bi(2223)-based ring lens and a double-layered lens having an outer melt-processed Y-based ring. The outer- and innermost diameters of the lenses were 22 and 16 mm, respectively, with a total axial length of 55 mm including a funnel-type inlet. The powder-pressed lens compressed the electron pulses to ∼5 ns in duration at 70 K, whereas the double-layered lens provided ∼3.7 ns pulses. The durations were both longer than those (∼1.4–3.0 ns) for previous double-layered lenses in which the inner rings were made from sintered Bi(2223)-based materials. These results are explained by a ferrite-core model for supertrons.

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