Grid coating for thermionic electron emission suppression

Details Grid coating for thermionic electron emission suppression Grid coating for thermionic electron emission suppression

H - Electricity

01

J

313/35.351

H01J 29/02 (2006.01) H01J 1/46 (2006.01) H01J 23/05 (2006.01)

Patent

CA 1135324

PATENT APPLICATION of GEORGE MIRAM for GRID COATING FOR THERMIONIC ELECTRON EMISSION SUPPRESSION Abstract In an electron gun having a control grid in contact with the face of the cathode, unwanted thermionic emission from the cathode can be effectively suppressed by applying a thin (1 micron) coating of boron nitride to the surface of the control grid. The boron nitride has low thermionic emission itself and, in addition, has an unusual ability to shed or eliminate any deposits of emissive material such as barium or its oxides which come in contact with the boron nitride layer. For optimum performance and longest lifetime, the boron nitride layer is applied over a pyrolytic graphite layer which may be the conductive grid itself.

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