Abstract:
A grid-like electrode for electronic components having its grid portion made of fibrous carbon threads bonded by means of the coke of an organic polymer. The grid-like electrode is made by impregnation of each fibrous carbon thread with a liquid organic polymer containing at least 20% by weight of carbon. Then a grid-like electrode is shaped from these threads and subjected to heating until the polymer is irreversibly cured, followed by heating of the polymer to cause pyrolysis thereof to a glossy carbon state.
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.