Electron tube with pyrolytic graphite heating element

Details Electron tube with pyrolytic graphite heating element Electron tube with pyrolytic graphite heating element

1978-07-11

1979-12-11

Smith, Alfred E.

Electric lamp and discharge devices

Electrode and shield structures

Indirectly heated cathodes

313345, 313346R, 313355, H01J 122, H01J 1916

Patent

active

041785304

ABSTRACT:
In a thermionic cathode having a planar emissive body and a heating element of pyrolytic graphite which is provided on the side of the emissive body remote from the emissive surface of the emissive body, a uniform temperature distribution adjusts during operation throughout the overall emissive surface when the heating element is planar and the crystallographic c-axis of the pyrolytic graphite extends everywhere normal 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 homogeneous temperature distribution.

REFERENCES:
patent: 3389290 (1968-06-01), Yoshida et al.
patent: 3591822 (1971-07-01), Katz

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