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Proceedings Paper

H[sup]-[/sup] Formation Via Surface Conversion At A Barium Converter In A High Power DC Environment
Author(s): C. F. A. van Os; C. Leguijt; R. M. A. Heeren; J. Los; A. W. Kleyn
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Paper Abstract

Experiments on the production of negative hydrogen ions via surface conversion for incident positive hydrogen ion currents in the range of 0.2 to 1 A/cm2 are reported. The conversion efficiency, i.e. the ratio of the produced negative ion current and the positive ion current on the converter shows a strong temperature dependence and has a maximum for a positive ion current density of about 0.5 A/cm2. Due to the limited magnetic confinement of the intense hydrogen plasma, the base pressure of these experiments was of the order of 50 mTorr which resulted in very large losses of negative ions due to stripping. With correction for these losses, we obtained a conversion efficiency, of the order of 8 percent which corresponds to a surface produced negative ion current density of the order of 60 mA/cmh.

Paper Details

Date Published: 25 July 1989
PDF: 5 pages
Proc. SPIE 1061, Microwave and Particle Beam Sources and Directed Energy Concepts, (25 July 1989); doi: 10.1117/12.951841
Show Author Affiliations
C. F. A. van Os, FOM-Institute for Atomic and Molecular Physics (The Netherlands)
C. Leguijt, FOM-Institute for Atomic and Molecular Physics (The Netherlands)
R. M. A. Heeren, FOM-Institute for Atomic and Molecular Physics (The Netherlands)
J. Los, FOM-Institute for Atomic and Molecular Physics (The Netherlands)
A. W. Kleyn, FOM-Institute for Atomic and Molecular Physics (The Netherlands)


Published in SPIE Proceedings Vol. 1061:
Microwave and Particle Beam Sources and Directed Energy Concepts
Howard E. Brandt, Editor(s)

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