Negative ion source

Details Negative ion source Negative ion source

1984-06-29

1987-04-28

Anderson, Bruce C.

Radiant energy

Ion generation

Field ionization type

250427, 376129, H01J 2702

Patent

active

046617108

ABSTRACT:
Negative ion source making it possible to produce an intense beam of negative ions, particularly of hydrogen and deuterium, as well as negative ions of other species. According to the main feature of this negative ion source, the number and distribution of the permanent magnets forming the magnetic multicusp confinement is chosen in such a way that the confinement time of the primary electrons is between 10.sup.-7 and 10.sup.-6 second and the thermionic electron emitters are located in the multicusp magnetic field between the saddle point of the magnetic field, formed by two adjacent permanent magnets and the center of the plasma in the vicinity of said saddle points. It is advantageously applied to the production of high-energy neutral atom beams used e.g. as an effective means for heating plasmas, produced in magnetic confinement fusion means.

REFERENCES:
patent: 4140943 (1979-02-01), Ehlers
patent: 4447732 (1984-05-01), Leung et al.
patent: 4486665 (1984-12-01), Leung et al.
K. W. Ehlers et al., "Further Study on a Magnetically Filtered Multicusp Ion Source," Rev. Sci. Insts. 53(9), Sep. 1982, pp. 1423-1428.
Bacal et al., "Extraction of Volume-Produced H.sup.- ions," Rev Sci Insts. 56(5), May 1985, pp. 649-654.
Bacal et al. "Progress in Developing a Volume D.sup.- Ion Source", Proc. 10th Symposium on Fusion Engineering, Dec. 1983.
Leung et al., Extraction of Volume Produced H.sup.- Ions From a Multi-Cusp Source; Rev. Sci. Inst., Jan. 1983.
Leung et al., Optimization of Permanent Magnet Plasma Confinement, Phys. Lett., vol. 51A, No. 8, May 1975.
Article by H. S. McKown et al. published in the Journal of Mass Spectrometry and Ion Physics, vol. 51, No. 1, Jun. 1983.

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