Ion source

Details Ion source Ion source

1987-05-12

1988-07-26

Laroche, Eugene R.

Radiant energy

Ion generation

Field ionization type

31511181, 250427, H01J 2700

Patent

active

047602627

ABSTRACT:
An ion source (10) of the side-extraction hot cathode type in which the inherent drift of electrons toward the positive side of the cathode is minimized by the addition of auxiliary electrodes (31, 32) which surround the cathode (14) at the ends of the anode (12). The electrodes are electrically isolated from the cathode and anode, and various means are provided to apply a potentials to the electrodes, including interconnecting the electrodes, cross-connecting the electrodes to opposite ends of the cathode, and biasing the electrodes at fixed potentials with respect to the cathode, anode or ground.

REFERENCES:
patent: 4139772 (1979-02-01), Williams
patent: 4288716 (1981-09-01), Hinkle et al.
patent: 4608513 (1986-08-01), Thompson
patent: 4687938 (1987-08-01), Tamura et al.
Alton, "Aspects of the Physics, Chemistry & Tech. of High Intensity Heavy Ion Sources", Nuclear Inst. & Methods, pp. 15-42, 1981.
Freeman, "A New Ion Source for E-M Isotope Separators", Nuclear Inst. & Methods, pp. 306-316 (1963).
La Postolle and Septier, Linear Accellerators, North Holland Pub. Co., pp. 838-874, 1970.
Yabe, "Ion Source with Plasma Cathode", Rev. Scientic Instruments, pp. 1-5, 1987.

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