Radiant energy – Ion generation – Field ionization type
Patent
1988-11-14
1990-01-02
Fields, Carolyn E.
Radiant energy
Ion generation
Field ionization type
31323131, 3133601, 2504922, 2504923, 250427, 31511131, 31511181, H01J 2700
Patent
active
048915254
ABSTRACT:
An ion source of the side extraction type which includes auxiliary electrodes surrounding the cathode at the ends of the anode, and insulators surrounding the auxiliary electrodes and electrically isolating them from the anode. The auxiliary electrodes essentially define the ends of the discharge chamber, leaving the anode confined to the cylindrical surface surrounding the filament. Each insulator is made up of an inner insulator and an outer insulator with an annular space defined between them. The inner and outer insulators are each in the form of a cylinder with a radially extending flange formed at one end, and interfit with the anode and with each other such that cylindrical spaces are defined between the outer flange portion and the anode and between the inner and outer flange portions. These and other features contribute to improve the electrical isolation between the auxiliary electrode and the anode, prolong source life, and improve beam purity.
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Freeman, "A New Ion Source for Electromagnetics Isotope Separators", Nuclear Instruments and Methods, pp. 306-316, (1963).
Alton, "Aspects of the Physics, Chemistry and Technology of High Intensity Heavy Ion Sources", Nuclear Instruments and Methods, pp. 15-42, (1981).
LaPostolle and Septier, "Linear Accelerators", North Holland Publishing Company, pp. 838-874, (1970).
Frisa Larry E.
King Monroe L.
Sampayan Stephen E.
Eaton Corporation
Fields Carolyn E.
Miller John A.
Sajovec F. M.
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