A spherical-geometry, self-extraction negative ion source has been designed and fabricated. The source utilizes direct surface ionization to form negative ion beams resulting from interactions between high electron affinity gaseous elemental or molecular materials and a negatively biased, spherical-sector LaB6 surface ionizer maintained at ∼1300 K. The design features of this source and principles upon which the source is based are discussed in this report.
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G. D. Alton (1992) studied this question.
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