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Emissive Properties of Electrodes of Surface-Plasma Sources and the Efficiency of H exp - Ion Generation

机译：表面等离子体源电极的发射特性和H指数离子的产生效率

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The ratio of the discharge current density at the cathode, j/sub d/, to the current density of positive ions, j/sub +/, was determined from the yield of positive ions through narrow slits in the cathodes of a Penning cell. As the discharge voltage U/sub d/ in the surface plasma source (SPS) decreased as a result of the supply of cesium, j/sub d//j/sub +/ increased from 1.1 to 1.2 at U/sub d/ = 400 to 600 V to j/sub d//j/sub +/ approximately equal to 6-8 at U/sub d/ = 100 V, and the secondary emission factor of hydrogen ions increased from K exp - = j/sub -//j/sub +/ approximately equal to 0.01 to K exp - approximately equal to 0.6-0.8. With such emissive properties of the electrodes, the energy cost of formation of H exp - ions in an SPS can be decreased to P/sub -/ approximately equal to 250 eV/ion. (ERA citation 03:038597)

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