David R Whaley

US Patent:

6683414, Jan 27, 2004

Filed:

Oct 25, 2001

Appl. No.:

10/057623

Inventors:

David Riley Whaley - Rolling Meadows IL

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

H01J 724

US Classification:

31511181, 250423 F

Abstract:

An apparatus and a method of focusing a high-current-density electron beam emitted from a cold cathode electron emitter. A series of shaped electrostatic lense are provided in front an emission surface of the cold cathode electron emitter. An ion shield is further inserted in front of the emission surface. By applying different focusing voltages to the shaped electrostatic lenses, the electron beam is focused and well confined.

US Patent:

60029889, Dec 14, 1999

Filed:

Dec 30, 1997

Appl. No.:

9/001328

Inventors:

David Riley Whaley - Chicago IL
Carter Michael Armstrong - Kildeer IL

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

H01J 2308

US Classification:

702 57

Abstract:

In accordance with the present invention, there is provided a method of profiling a total vector potential field of a periodic permanent magnetic field structure, wherein desired elements of the total vector potential field are known. The magnetic field structure comprises a plurality of magnets having individual vector potential fields which collectively form the total vector potential field. The method provides for using an electromagnetic solver to generate data files representative of each individual magnet's contribution to the total vector potential field. Such data files are generated by assuming a magnetization value of one unit for a selected magnet, setting magnetization values of zero for all other magnets, setting the electromagnetic solver to use high resolution proximate the selected magnet and to use low resolution elsewhere, using the electromagnetic solver to compute the individual vector potential fields for all space for which the total vector potential field is to be profiled, and repeating such steps for each magnet of the plurality of magnets to generate the data files. The method further provides for using the data files to determine magnetization values for each magnet necessary to provide the desired elements of the total vector potential field, and using the determined magnetization values to superimpose the individual vector potential fields to determine the total vector potential field.