Ion source electrode biasing technique for microsecond beam pulse rise times
| Autor: | M. D. Williams, M. L. Rickard, Ka-Ngo Leung, L. T. Perkins, J. W. Kwan |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Review of Scientific Instruments. 69:1060-1062 |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/1.1148710 |
| Popis: | Heavy ion fusion (HIF) induction accelerators require ion sources that can deliver intense heavy ion beams with low emittance. The typical pulse length is 20 μs with a rise time less than 1 μs and a repetition rate of 10 Hz. So far, the surface ionization sources have been used in most HIF induction linac designs. However, there are other ions of interest to HIF (e.g., Hg, Xe, Rb, Ar, and Ne) which cannot be produced by the surface ionization sources, but rather by volume ion sources. In this paper, we describe an experiment that uses a multicusp source with a magnetic filter to produce beam pulses that have a rise time in the order of 1 μs. By applying a positive biasing pulse on the plasma electrode with respect to the source body, the positive plasma ions can be temporarily repelled from the neighborhood of the extraction aperture, leading to a suppression of the ion beam. As the bias is removed, positive ions flow to the extraction region, enabling a fast-rising beam pulse. The beam current pulses sho... |
| Databáze: | OpenAIRE |
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