Method and apparatus for electrostatic deflection of high curren

Details Method and apparatus for electrostatic deflection of high curren Method and apparatus for electrostatic deflection of high curren

1975-06-30

1976-12-14

Rolinec, R. V.

Electric lamp and discharge devices

With temperature modifier

For lead-in-seal or stem protection

313421, 313427, 313432, H01J 2956, H01J 2970

Patent

active

039978460

ABSTRACT:
A novel method and apparatus for achieving electrostatic deflection of high current ion beams within a scanning apparatus. In one embodiment, a pair of gates are provided, with one gate being oriented proximate each side of the deflection plates, and each gate being biased to a negative voltage of a sufficient amplitude to repel electrons which otherwise would be attracted to the positively-biased deflection plates to thereby protect the electron cloud from degradation, and maintain space charge neutralization of the ion beam. In another embodiment, means are provided to drive the deflection plates at negative voltages at all times and to maintain portions of the ground tube of the apparatus adjacent the deflection plates at a ground or negative level in order to avoid degradation of the electron sheath.

REFERENCES:
patent: 2237671 (1941-04-01), Kallmann
patent: 2957141 (1960-10-01), Jernakoff
patent: 3040205 (1962-06-01), Walker
patent: 3313969 (1969-04-01), Wolter
patent: 3535880 (1970-10-01), Work et al.
patent: 3887834 (1975-06-01), Himmelbauer

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