Electron tube

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H - Electricity

01

J

313/168

H01J 1/14 (2006.01) H01J 1/24 (2006.01)

Patent

CA 1110689

ABSTRACT: In a thermionic cathode having a planar emis- sive body and a heating element of pyrolytic graphite which is provided on the side of the emissive body re- mote from the emissive surface of the emissive body, a uniform temperature distribution adjusts during opera- tion throughout the overall emissive surface when the heating element is planar and the crystallographic c- axis of the pyrolytic graphite extends everywhere nor- mal to the surface of the heating element facing the emissive body. As a result of this the possibility is obtained of realizing a planar, "rapid" induction-free unipotential cathode having a substantially ideal homo- geneous temperature distribution. - 14 -

307297

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