Dielectric guide for electron beam transport

Electric lamp and discharge devices – Electrode and shield structures – Composite electrodes or shields

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250396R, 313355, 313361, H01J 102, H01J 114, H01J 138, H01K 104

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040792854

ABSTRACT:
An evacuated enclosure in the form of a cylindrical cavity having a dielectric located therein defines a dielectric guide for transporting an electron beam introduced into the cavity. The dielectric, which is disposed about the cavity wall, is operative to trap the charge associated with normal vacuum expansion of the electron beam. The trapped charge, in cases where the injected electron beam is not space charge limited, modifies the electric fields within the cavity in such a way as to provide focusing forces on the electron beam propogating through the cavity, the focusing forces being sufficient to guide a major portion of the beam through the enclosure without attenuation. Within the injected beam is space charge limited, the trapped charge induces an electrical discharge -- either surface flashover or volume puncture of the dielectric -- which liberates gaseous material. This gas then ionizes, is attracted by space charge electric fields into the body of the beam, and provides space charge neutralization. In this situation the beam is confirmed by its self-magnetic field and propogates through the cavity with little attenuation.

REFERENCES:
patent: 3336495 (1967-08-01), Loew
patent: 3412196 (1968-11-01), Figgins
patent: 3489943 (1970-01-01), Denholm
patent: 3850628 (1974-11-01), Pressman
patent: 3864640 (1975-02-01), Bennett
patent: 3914637 (1975-10-01), Bennett

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