Alfred J Cook

US Patent:

45889651, May 13, 1986

Filed:

Jun 25, 1984

Appl. No.:

6/623896

Inventors:

Alfred W. Cook - Andover MA

Assignee:

Varian Associates, Inc. - Palo Alto CA

International Classification:

H03B 910

US Classification:

331 91

Abstract:

A coaxial magnetron has a high-Q resonant cavity surrounding a multiple-resonator anode circuit and coupled by slots to alternate anode resonators. The cavity is resonant in the TE. sub. 111 mode, having two zero points of electric field on its periphery. The anode circuit is correspondingly resonant in its N/2-1 mode. Mode suppression means damp out the degenerate TE. sub. 111 mode which is not coupled to the output iris. The size and weight of the magnetron are much less than conventional tubes using a cavity resonant in the TE. sub. 011 mode with circular electric field.

US Patent:

39847250, Oct 5, 1976

Filed:

May 19, 1975

Appl. No.:

5/578576

Inventors:

Alfred W. Cook - Andover MA
Thomas H. Schultz - S. Hamilton MA

Assignee:

Varian Associates - Palo Alto CA

International Classification:

H01J 2550

US Classification:

315 3951

Abstract:

A permanent magnet structure particularly beneficial for generating the interaction field in coaxial, crossed field electron tubes is designed such that the normal iron flux return path is not required. Substantial reduction in weight results. A further benefit is that a magnetron interaction structure including the magnets may be built as a unit replaceable in the field in a stabilizing cavity structure. Since the cavity structure contains no iron, the magnets are not demagnetized in the replacement process and there are no mechanical mounting problems caused by magnetic forces.