Raymond Elmer Watkins

US Patent:

6653787, Nov 25, 2003

Filed:

Mar 5, 2002

Appl. No.:

10/091433

Inventors:

Raymond F. Watkins - San Mateo CA
Richard Brownell True - Sunnyvale CA

Assignee:

L-3 Communications Corporation - San Carlos CA

International Classification:

H01J 2302

US Classification:

315 538, 315 35

Abstract:

A collector for a linear beam has a segmented ceramic collector core that permits sustained operation at high temperatures and power densities. The collector provides efficient heat transfer from the while reducing stresses on collector components caused by thermal cycling and comprises a heat sink having a cavity providing interior vacuum walls for the collector a segmented ceramic insulator disposed inside the cavity, and an electrode disposed inside and against the insulator. The insulator comprises sectors separated from one another by gaps, and may be notched in its outer surface for high-voltage stand-off from the sink. The electrode is preferably not brazed/soldered to the insulator. A stage of the electrode may be probeless and comprise a depression. A molybdenum-fabricated heat sink and stage assembly utilizes an insulator constructed from beryllium oxide, aluminum nitride, or alumina; alternatively, a copper assembly, uses an aluminum nitride insulator.

US Patent:

63203154, Nov 20, 2001

Filed:

Oct 22, 1998

Appl. No.:

9/176629

Inventors:

Raymond F. Watkins - San Mateo CA

Assignee:

Litton Systems, Inc. - Woodland Hills CA

International Classification:

H01J 23027

US Classification:

315 538

Abstract:

A collector structure comprises a heat sink having a cylindrical opening, a sleeve disposed within the cylindrical opening of the heat sink, and a collector core disposed within the sleeve. The sleeve is comprised of a material having a rate of thermal expansion different than that of the heat sink and is disposed in close contact with the heat sink when the collector is at an elevated operational temperature. A slight gap is defined between the collector core and the sleeve when the collector is at an ambient temperature, and the collector core is in close contact with the sleeve when the collector is at the operational temperature. The heat sink further comprises either copper or aluminum, the sleeve is comprised of molybdenum, and the collector core is comprised of a ceramic material. To manufacture the collector structure, the heat sink is heated to a temperature above the operational temperature and the sleeve is inserted into the cylindrical opening of the heat sink at the elevated temperature. The collector core is then inserted into the sleeve at an ambient temperature of the collector structure.