Radiant energy – Ion generation – Electron bombardment type
Patent
1983-05-17
1985-03-19
Anderson, Bruce C.
Radiant energy
Ion generation
Electron bombardment type
250423R, 376127, 376130, H01J 2700
Patent
active
045061602
ABSTRACT:
A gas is introduced into a discharge chamber of an ion source apparatus, and a gas discharge is performed between a thermionic cathode and an anode. Ions are extracted from the plasma formed in this gas discharge by a grid electrode. The thermionic cathode has a hollow cylindrical shape. A cathode chamber is defined by the thermionic cathode and a cylindrical partition wall supporting it. A columnar auxiliary electrode is coaxially inserted in the thermionic cathode. An A.C. voltage from a power source unit is supplied between the thermionic cathode and the auxiliary electrode such that effective power for keeping the thermionic cathode at a positive potential with respect to the auxiliary electrode is higher than that for keeping the auxiliary electrode at a positive potential with respect to the thermionic cathode.
REFERENCES:
patent: 3453480 (1969-07-01), Katz
Nuclear Instruments and Methods, vol. 127, No. 2 (Aug. 1975), R. Kirchner et al., "A Cathode With Long Lifetime for Operation of Ion Sources With Chemically Aggressive Vapours," pp. 307-309.
Review of Scientific Instruments, vol. 48, No. 11 (Nov. 1977), V. Laul et al., "Improved Method for Heating Large Tungsten Cathodes," pp. 1499-1500.
Review of Scientific Instruments, vol. 40, No. 12 (Dec. 1969), N. Rynn, "A Method for Uniformly Heating a Metallic Surface in a Vacuum," pp. 1650-1651.
Proceedings of the 7th Symposium on Engineering Problems of Fusion Research (Oct. 25-28, 1977), J. H. Fink et al., "A Long-Life Cathode for the Berkeley-Type Ion source," pp. 1398-1399.
N. Rynn, Rev. Sci. Instrum. 35 (40) 1650-1 (1964).
V. Laul, N. Rynn, H. Bohmer, Rev. Sci. Instrum. 48 (11) 1499 (1977).
M. M. Menon et al., 12th Symposium of Fusion Technology, Julich (1982), and D. E. Schechter, C. C. Tsai, 9th Symposium of Engineering Problems of Fusion Research, Chicago.
9th Symposium on Engineering Problems of Fusion Research Chicago, 1981 D. E. Schecter and C. C. Tsai.
Ito Yasuyuki
Sugawara Toru
Anderson Bruce C.
Guss Paul A.
Tokyo Shibaura Denki Kabushiki Kaisha
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