Tests on a hydrogen ion gun assembly employing differential pumping are described. Focused beam currents as high as 215 microamperes were realized at the target end of a high voltage tube 6 feet long operating in the range from 300 to 400 kilovolts. Factors which limited the current to 215 microamperes are discussed and suggestions for realizing greater beam currents are presented.
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Lamar et al. (1947) studied this question.
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