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McMinnville, OR, United States

Patent
Applied Physics Technologies Inc. | Date: 2013-11-11

A thermionic emission assembly includes a Wehnelt cap that has a cap beam aperture and a cavity within which a cathode is supported. Electrical energy applied to the cathode causes it to reach a sufficiently high temperature to emit a beam of electrons that propagate through the cap beam aperture. An anode having an anode beam aperture is positioned in spatial alignment with the cap beam aperture to receive the electrons. The anode accelerates the electrons and directs them through the anode beam aperture for incidence on a target specimen. A ceramic base forms a combined interface that electrically and thermally separates the Wehnelt cap and the anode. The thermal isolation of the Wehnelt cap from the anode allows the Wehnelt cap to increase in heat to rapidly reach a stable temperature as the cathode emits the beam of electrons.


Trademark
Applied Physics Technologies Inc. | Date: 2009-04-07

Cathode materials and components, namely, grid cap assemblies, grid cap and anode assemblies, electron gun assemblies, and electron columns for use with microscopy, lithography, metrology, tomography and non-scale displays; specialized neutral-charged electron devices for use in space propulsion acceleration systems, advanced metal fabrication systems, free electronic lasers, x-ray generators and microwave generators, namely, thermionic and field emission cathodes, lanthanum hexaboride and cerium hexaboride cathodes, transition metal carbide thermionic and field emission cathodes, cathodes for plasma light sources, and guard ring cathodes made of pyrolytic carbon, graphite or colloidal carbon coating on transition metal carbides; deposited, structured field emitter array cathodes; field emitters, namely, single-crystal carbide and refractory metal, single-crystal etched cathodes for thermal and field electron emitters, STM (Scanning Tunnel Microscopes) probes, and Schottky electron sources; tungsten wire electrodes for use in electron emission sources; single-crystal carbide probes for STM (Scanning Tunneling Microscopes) probes. Scientific and technological research and development related to electron emission testing and new product development and transition metal carbides, thermionic electron emission cathodes, and field electron sources; providing expert advice and consultation to others on the subject of scientific and technological research and development related to emission testing and new product development of transition metal carbides, thermionic electron emission cathodes, and field electron sources; custom design and development of electron emitting materials and electron emission sources; research for others in the field of fundamental electron emissions, and preparing reports in connection therewith; scientific analysis of auger surfaces and field emission measurements over a large range of currents and operating atmospheres.


Ap

Trademark
Applied Physics Technologies Inc. | Date: 2009-04-07

Cathode materials and components, namely, grid cap assemblies, grid cap and anode assemblies, electron gun assemblies, and electron columns for use with microscopy, lithography, metrology, tomography and non-scale displays; specialized neutral-charged electron devices for use in space propulsion acceleration systems, advanced metal fabrication systems, free electronic lasers, x-ray generators and microwave generators, namely, thermionic and field emission cathodes, lanthanum hexaboride and cerium hexaboride cathodes, transition metal carbide thermionic and field emission cathodes, cathodes for plasma light sources, and guard ring cathodes made of pyrolytic carbon, graphite or colloidal carbon coating on transition metal carbides; deposited, structured field emitter array cathodes; field emitters, namely, single-crystal carbide and refractory metal, single-crystal etched cathodes for thermal and field electron emitters, STM (Scanning Tunnel Microscopes) probes, and Schottky electron sources; tungsten wire electrodes for use in electron emission sources; single-crystal carbide probes for STM (Scanning Tunneling Microscopes) probes. Scientific and technological research and development related to electron emission testing and new product development and transition metal carbides, thermionic electron emission cathodes, and field electron sources; providing expert advice and consultation to others on the subject of scientific and technological research and development related to emission testing and new product development of transition metal carbides, thermionic electron emission cathodes, and field electron sources; custom design and development of electron emitting materials and electron emission sources; research for others in the field of fundamental electron emissions, and preparing reports in connection therewith; scientific analysis of auger surfaces and field emission measurements over a large range of currents and operating atmospheres.


Trademark
Applied Physics Technologies Inc. | Date: 2008-09-09

Cathodes and electron sources, namely, thermionic and field emission cathodes for use in microscopy, metrology, lithography and wafer inspection.


Grant
Agency: Department of Energy | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 74.97K | Year: 1996

40089 Applied Physics Technologies Corporation Improvements over existing scintillators, in light output, gamma ray detection efficiency, and fast decay times for their scintillation light, has been of interest to the nuclear physics, high energy physics, nuclear medicine (especially PET) and astrophysics communities. New detector approaches for enhancing the performance and reducing the cost of gamma ray imaging systems is also of great interest. This project will develop a detector system which utilizes a new scintillator coupled to a photosensitive wire chamber (PWC). Significant improvements in the production of very pure, high quality LaF3:Nd allow for an extremely fast scintillator with moderate light output and density. The PWC will use CsI photocathodes for a matching detector which has high quantum yield with LaF3, 2-3 mm positional resolution, and is significantly less expensive than phototube-based gamma ray imaging detectors in use today. Phase I includes reducing contaminants in the LaF3, optimizing Nd doping levels, and optimizing light collection/transmission for maximum light yield. Phase II, will construct a LaF3:Nd-CsI photocathode PWC and its complimentary electronics. Anticipated Results/Potential Commercial Applications as described by the awardee: This project will result in a gamma ray imaging system which mates a new fast, dense, rugged scintillator with good light output to a 2D position sensitive wire chamber, offering high quantum efficiency for the light produced in the crystal. The approach should offer the physics and astrophysics research communities, as well as the non-destructive industrial imaging community, a substantial improvement in detector technology at a relatively low cost.

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