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Abstract
The downstream energy and impurity content of the plasma produced by a pulsed crossed-field source is investigated. With a positive center electrode and an optimum neutral gas loading, the source ionizes and accelerates 7×1017 protons containing 140 J of energy to the end of a 2-m-long axial magnetic guide field. This energy is distributed equally between axial motion and gyromotion. The dominant acceleration method is the −μ·∇B force resulting from a gradient in the axial magnetic field within the source. Impurities, in the form of C2+ and O2+ ions, account for about 10% of the plasma. Reversing the source polarity results in a lower energy efficiency and the appearance of Fe2+ ions in the downstream plasma.
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