# US 2021/0280402 A1 · Multipactor plasma ignition devices and techniques > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0280402 A1 - Document ID: US20210280402A1 - Status: Published application - Kind: A1 - Application number: 17/192,781 - Filed: 2021-03-04 - Published: 2021-09-09 - Earliest claimed: 2020-03-04 - Inventors: Eric Benjamin Frederick Gilbert - Web page: https://patentgrep.com/patent/US20210280402A1 ## CPC - H01J 37/3222: {Antennas} - H01J 37/3405: {Magnetron sputtering} - H01J 37/32229: {Waveguides} - H01J 37/32669: {Particular magnets or magnet arrangements for controlling the discharge} - H05H 1/4622: {using waveguides} - H05H 1/463: {using antennas or applicators} - H01J 2237/152: Magnetic means - Y02E 30/10: Nuclear fusion reactors - H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H) - H05H: PLASMA TECHNIQUE (apparatus or processes specially adapted for producing X-rays H05G2/00); PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A high temperature plasma generating system has a ceramic magnetron insulator joined to a frustoconical waveguide reflector. A cavity magnetron tube is joined to the frustoconical waveguide reflector. An antenna is set in the cavity magnetron tube and extending through the ceramic magnetron insulator. Applying an electrical current to the magnetron creates multipactor in the frustoconical waveguide reflector generating plasma focused at the tip of the magnetron antenna. ## Claims ### Claim 1 A system configured to create generate plasma; the system comprising: a ceramic magnetron insulator, joined to a frustoconical waveguide reflector; a cavity magnetron tube, joined to the frustoconical waveguide reflector; and an antenna, set in the cavity magnetron tube and extending through the ceramic magnetron insulator; wherein applying an electrical current to the cavity magnetron creates multipactor in the frustoconical waveguide reflector generating plasma within the frustoconical waveguide reflector and creating a focused plasma. ### Claim 2 (depends on 1) The system of claim 1, wherein the focused plasma is created adjacent to a first end of the antenna, the first end of the antenna distal from the magnetron. ### Claim 3 (depends on 1) The system of claim 1, wherein the antenna has a length of approximately ¾ of a characteristic wavelength of the cavity magnetron. ### Claim 4 (depends on 1) The system of claim 1, wherein the antenna has a length of approximately ¼ of a characteristic wavelength of the cavity magnetron. ### Claim 5 (depends on 4) The system of claim 4, wherein the antenna has a first end distal to the cavity magnetron, the first end creating a point. ### Claim 6 (depends on 1) The system of claim 1, further comprising a cylindrical waveguide coupled to the frustoconical waveguide surrounding a portion of the antenna. ### Claim 7 (depends on 6) The system of claim 6, wherein the cylindrical waveguide surrounds a portion of the antenna corresponding to a location that is distance from the cavity magnetron of approximately ½ of a characteristic wavelength of the cavity magnetron. ### Claim 8 (depends on 6) The system of claim 6, further comprising a frusto-spherical waveguide coupled to the cylindrical waveguide enclosing an end of the antenna. ### Claim 9 (depends on 6) The system of claim 6, further comprising a frusto-spherical waveguide coupled to the cylindrical waveguide enclosing an end of the antenna. ### Claim 10 (depends on 1) The system of claim 1, further comprising a hermetic, optically transparent enclosure enclosing the antenna and the frustoconical waveguide and an inert gas. ### Claim 11 (depends on 10) The system of claim 10, wherein the hermetic, optically transparent enclosure is held at a first pressure below atmospheric pressure when cool and held at a second pressure greater than the first pressure and equal to or below atmospheric pressure when a plasma is generated. ### Claim 12 (depends on 1) The system of claim 1, further comprising an injection system configured to inject a fluid adjacent to the antenna. ### Claim 13 (depends on 12) The system of claim 12, wherein the fluid comprises water that is transformed into steam and reacts with hydrocarbons to generate hydrogen and carbon monoxide. ### Claim 14 A method comprising: applying an electrical current to a cavity magnetron coupled to an antenna, the antenna extending through a waveguide, the antenna having a length of approximately ¾ of a characteristic wavelength of the cavity magnetron; generating a multipactor effect between the waveguide and the antenna; and creating a focused plasma adjacent to an end of the antenna. ### Claim 15 (depends on 14) The method of claim 14, further comprising: inj ecting a fuel into a controlled environment containing the antenna and waveguide; generating tritium plasma adjacent to end of the antenna; accelerating the fuel and the tritium plasma; colliding the fuel with the tritium; and generating a fusion reaction. ### Claim 16 (depends on 15) The method of claim 15, wherein the fuel comprises deuterium ions and protons. ### Claim 17 (depends on 15) The method of claim 15, wherein the controlled environment is controlled to be at a near vacuum. ### Claim 18 A fusor system comprising: a cavity magnetron having a characteristic wavelength of emission; an antenna coupled to the cavity magnetron, the antenna having a length, the length approximately ¾ of the characteristic wavelength; a waveguide disposed adjacent to the antenna and configured to reflect emissions from the antenna to generate a multipactor effect; an enclosure enclosing the antenna and the waveguide creating a chamber, the enclosure configured to control an environment within the enclosure; and a fuel injection system configured to inject a fuel into the chamber and generate a fusion reaction in response to the multipactor effect of emission generated by the cavity magnetron. ### Claim 19 (depends on 18) The fusor system of claim 18, wherein the fuel comprises a deuterium ions and protons. ### Claim 20 (depends on 18) The fusor system of claim 18, wherein the waveguide and a portion of the enclosure is configured to reflect neutrons.