Atomic processes, cross sections, and reaction rates necessary for modeling hydrogen negative-ion sources and identification of optimum H− current densities
- 1 April 1992
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 63 (4) , 2702-2704
- https://doi.org/10.1063/1.1142828
Abstract
The principal electron excitation cross sections for vibrational excitation in a hydrogen discharge are reported. In the first chamber of a two‐chamber hydrogen negative‐ion‐source system subject to the beam‐line constraint of a maximum gas pressure, the density of vibrationally excited molecules reaches an asymptote for increasing discharge current or the equivalent fast electron density. Operating near this first‐chamber asymptote, there exists a spatially dependent maximum negative‐ion density in the second chamber. With the extraction grid placed at this maximum the optimum performance of a hydrogen‐based system is determined. This optimum performance provides a criterion for the selection of differing source types for fusion applications.Keywords
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