Mechanical design and fabrication of a barium surface conversion H/sup -/ ion source

R. Wells, T. Stevens, C. V. van Os
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Abstract

The details of a prototype surface conversion ion source, designed for continuous operation are described. The source consists of an annular, convectively water-cooled, magnetic multi-cusp driver chamber separated by a magnetic field from an inner chamber. A barium-coated spherically contoured disc-shaped converter in the inner chamber produces a stream of H/sup -/ ions focused at the exit aperture. The converter is electrically biased up to 300 V negative with respect to the source potential. Jacketed, water-cooled permanent magnets near the source exit deflect electrons out of the beam path. Techniques for fabrication and maintenance of a clean barium metal surface are also discussed.<>
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钡表面转换H/sup /离子源的机械设计与制造
描述了一个用于连续工作的原型表面转换离子源的细节。该源由一个环形、对流水冷、磁性多尖头驱动室组成,由磁场与内室隔开。内腔中有一个包覆钡的球形圆盘状转化器,产生聚焦在出口孔径处的氢/离子流。转换器相对于源电位的电偏高达负300v。在源出口附近的夹套水冷式永磁体使电子偏离光束路径。本文还讨论了清洁钡金属表面的制造和维护技术。
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