H- production from a barium converter with different discharge configurations

The production of H− ions at a barium converter immersed in a hydrogen plasma has been investigated experimentally for a pulsed discharge. It is found that the scaling of the negative ion output with incident positive ion current on the converter depends greatly on the actual geometry of the plasma generator. A less than linear scaling is observed in a multicusp system. A more than linear scaling is obtained in a configuration where the filament and the converter are separated by a permanent magnet filter.

[1]  O. Fukumasa.  Numerical studies on the optimisation of volume-produced H- ions in the single-chamber system , 1989 .

[2]  J. Los,et al.  Negative ion formation at a barium surface exposed to an intense positive-hydrogen ion beam , 1988 .

[3]  V. Kovarik,et al.  High‐intensity H− ion source with steady‐state plasma injection , 1986 .

[4]  F. Brouillard,et al.  Experimental-study of the Mutual Neutralization of H+ and H- Between 5-ev and 2000-ev , 1984 .

[5]  K. W. Ehlers,et al.  Extraction of volume‐produced H− ions from a multicusp source , 1983 .

[6]  K. W. Ehlers,et al.  Effect of a magnetic filter on the formation and deposition of high‐Z impurities in a multicusp ion source , 1982 .

[7]  Ka-Ngo Leung,et al.  Further study on a magnetically filtered multicusp ion source , 1982 .

[8]  Ka-Ngo Leung,et al.  Self‐extraction negative ion source , 1982 .

[9]  Ka-Ngo Leung,et al.  Electron suppression in a multicusp negative ion source , 1981 .

[10]  K. W. Ehlers,et al.  Multicusp negative ion source , 1980 .

[11]  H. Tawara,et al.  Cross sections for charge transfer of hydrogen beams in gases and vapors in the energy range 10 eV-10 keV , 1978 .

[12]  J. W. Stearns,et al.  Intense, mixed-energy hydrogen beams for CTR injection , 1975 .

[13]  B. Peart,et al.  A measurement of cross sections for detachment from H- by a method employing inclined ion and electron beams , 1971 .

[14]  D. G. Hummer,et al.  Charge Transfer and Electron Production in H − +H Collisions , 1960 .