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Proceedings Paper

Progress in the development of the NRL modified betatron accelerator
Author(s): Lek K. Len; Tab J. Smith; Jeffry Golden; Kevin C. Smith; S. J. Marsh; Demos Dialetis; Joseph Mathew; Peter Loschialpo; Jeng-Hsien Chang; Christos A. Kapetanakos
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Paper Abstract

The lifetime of the circulating electron beam in the NRL modified betatron has been substantially increased from a few sec to over 700 sec by the addition of strong focusing windings to the device. The injected beam consistently spirals from the injector to the minor axis and is trapped. The s0. 5 kA trapped electron ring has been accelerated to 12 MeV from the injection energy of MeV. The beam acceleration has been confirmed not only by the x-ray attenuation technique but also with the detection. of photoneutrons from the reaction D(''y n)H. The experimental observations show that during acceleration the electrons cross initially higher order cyclotron resonances. Eventually when the ratio of the vertical B to toroidal magnetic field B0 is 1/9 i. e. at I 9 a substantial fraction of the ring electrons is lost. The remaining electrons are lost at higher B that is at lower values. Experiments are in progress to locate and eliminate the field error(s) that excite the resonances and thus to accelerate the electron ring to even higher energy. 1.

Paper Details

Date Published: 1 April 1990
PDF: 11 pages
Proc. SPIE 1226, Intense Microwave and Particle Beams, (1 April 1990); doi: 10.1117/12.18574
Show Author Affiliations
Lek K. Len, FM Technologies, Inc. (United States)
Tab J. Smith, Naval Research Lab. (United States)
Jeffry Golden, Berkeley Research Associates (United States)
Kevin C. Smith, SFA, Inc. (United States)
S. J. Marsh, SFA, Inc. (United States)
Demos Dialetis, Science Applications International Corp. (United States)
Joseph Mathew, Naval Research Lab. (United States)
Peter Loschialpo, Naval Research Lab. (United States)
Jeng-Hsien Chang, Naval Research Lab. (United States)
Christos A. Kapetanakos, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 1226:
Intense Microwave and Particle Beams
Howard E. Brandt, Editor(s)

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