Progress in the development of the NRL modified betatron accelerator

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

doi:10.1117/12.18574

1 April 1990 Progress in the development of the NRL modified betatron accelerator

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

Author Affiliations +

Proceedings Volume 1226, Intense Microwave and Particle Beams; (1990) https://doi.org/10.1117/12.18574
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

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.

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Lek K. Len, Tab J. Smith, Jeffry Golden, Kevin C. Smith, S. J. Marsh, Demos Dialetis, Joseph Mathew, Peter Loschialpo, Jeng-Hsien Chang, and Christos A. Kapetanakos "Progress in the development of the NRL modified betatron accelerator", Proc. SPIE 1226, Intense Microwave and Particle Beams, (1 April 1990); https://doi.org/10.1117/12.18574

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