Raytheon Company

Andras Dallos

Gordon R Spencer

Burton H Smith

Colin Bowness

John A Buckbee

A radio frequency amplifier having a slow wave structure supported adjacent an electron beam by a support structure. The support structure includes at least one structural support member, having a supporting rod, and a dielectric material disposed on an outer surface portion of the supporting rod. The dielectric material is different from the material of the supporting rod. More particularly the dielectric material is electrically insulating having either a resistivity which reduces upon impingement of electrons from the electron beam or a secondary emission ratio that is substantially unity. The supporting rod has high thermal conductivity and is preferably boron nitride. The dielectric material is preferably titania, magnesia or beryllia.

Slow wave delay line structure having support rods coated by a

A cathode current control system comprising an electron discharge device having a tubular envelope wherein an electron gun is disposed to beam a cathode current of electrons onto a spaced anode collector electrode, the gun including an electron emitting cathode, an apertured control grid electrode spaced from the cathode, and a further spaced series of beam forming electrodes; and external circuit means connected to the cathode and other electrodes of the device for maintaining the electrodes at respective predetermined electrical potentials relative to the cathode and for maintaining electron emission from the cathode sufficient for providing a predetermined level of cathode current associated with the predetermined electrical potentials of the electrodes.

Cathode current control system

A cathode ray tube control system comprising a cathode ray type tube having a tubular envelope wherein an electron gun is disposed to direct an electron beam onto a spaced anode target screen, the gun including an electron emitting source aligned with an adjustably biased grid means for controlling the current level of the electron beam, and external circuit means connected to the grid means and to the source for adjusting the current level of the electron beam and the electron emission capability of the source correspondingly.

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Lincoln, MA, United States of America

Andras Dallos