Magnetic and electrostatic confinement of plasma with tuning of electrostatic field

• US 7,015,646 B2
• Filed: 12/23/2002
• Issued: 03/21/2006
• Est. Priority Date: 02/01/2001
• Status: Expired due to Term

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Rostoker, Norman, Binderbauer, Michl, Tahsiri, Hooshang, Qerushi, Artan
• Primary Examiner(s): Dinh, Trinh Vo
• Application Number:
  US10/328,701
• Publication Number:
  US 20030230240A1
• Time in Patent Office: 1,184 Days
• Field of Search: 31511121-11161, 315/111.81, 315500-507, 376/107, 118/723.FI, 118/723.R
• US Class Current: 315/111.41
• CPC Class Codes: G21B 1/05 with magnetic or electric plasma confinement
• CPC Class Codes: G21B 1/052 reversed field configuration
• CPC Class Codes: G21D 7/00 Arrangements for direct production of electric energy from fusion or fission reactions obtaining electric energy from radioactive sources G21H1/00
• CPC Class Codes: H05H 1/03 using electrostatic fields
• CPC Class Codes: H05H 1/10 using externally-applied magnetic fields only , e.g. Q-machines, Yin-Yang, base-ball
• CPC Class Codes: H05H 1/12 wherein the containment vessel forms a closed or nearly closed loop G21B1/05 takes precedence
• CPC Class Codes: H05H 1/14 wherein the containment vessel is straight and has magnetic mirrors
• CPC Class Codes: H05H 1/16 using externally-applied electric and magnetic fields
• CPC Class Codes: Y02E 30/00 Energy generation of nuclear origin
• CPC Class Codes: Y02E 30/10 Nuclear fusion reactors

Abstract

A system and method for containing plasma and forming a Field Reversed Configuration (FRC) magnetic topology are described in which plasma ions are contained magnetically in stable, non-adiabatic orbits in the FRC. Further, the electrons are contained electrostatically in a deep energy well, created by tuning an externally applied magnetic field. The simultaneous electrostatic confinement of electrons and magnetic confinement of ions avoids anomalous transport and facilitates classical containment of both electrons and ions. In this configuration, ions and electrons may have adequate density and temperature so that upon collisions they are fused together by nuclear force, thus releasing fusion energy. Moreover, the fusion fuel plasmas that can be used with the present confinement system and method are not limited to neutronic fuels only, but also advantageously include advanced fuels.

Claims

1. A method of confining a plasma comprising positively charged ions and negatively charged electrons, the method comprising the steps of:

generating a first magnetic field within a chamber from an applied magnetic field,

generating a second magnetic field within the chamber;

combining the first and second magnetic fields forming a combined magnetic field having a topology of a field reversed configuration (FRC);

generating an electrostatic field within the confinement structure, the electrostatic field forming a electric potential energy well;

tuning the electrostatic field to a desired magnitude,

injecting plasma into the chamber, the plasma comprising positively charged ions and negatively charged electrons;

magnetically confining a plurality of plasma ions within the confinement structure by causing the plurality of plasma ions to orbit within the FRC due to Lorenz forces acting on the plurality of plasma ions; and

electrostatically confining a plurality of plasma electrons within the electric potential energy well.

2. The method of claim 1, wherein the step of tuning the electrostatic field includes increasing the magnitude of the electrostatic field.

3. The method of claim 1, wherein the step of tuning the electrostatic field includes manipulating the magnitude of the applied magnetic field.

4. The method of claim 3, wherein the step of generating the electrostatic field includes the steps of rotating the plasma in a diagmagnetic direction within the FRC, and creating an excess positive charge due to electrons leaving the plasma.

5. The method of claim 4, wherein the step of creating an excess positive charge includes exerting Lorentz forces on the plasma electrons.

6. The method of claim 1, wherein the steps of magnetically confining a plurality of plasma ions and electrostatically confining a plurality of electrons includes substantially classically containing the plurality of plasma ions and the plurality of plasma electrons.

7. The method of claim 6, wherein classically containing the plurality of plasma ions includes containing the plurality of plasma ions within the FRC for a period of time greater than a burn time of the plasma.

8. The method of claim 6, wherein classically containing the plurality of plasma ions includes substantially eliminating anamolous transport of the plurality of plasma ions.

9. The method of claim 8, wherein the plurality of plasma ions are substantially non-adiabatic.

10. The method of claim 9, wherein the plurality of plasma ions are substantially energetic.

11. The method of claim 8 further comprising the step of orbiting the plurality of plasma ions within the FRC in large radius betatron orbits wherein the radius of the ion orbits exceeds the wavelengths of anomalous transport causing fluctuations.

12. The method of claim 11, further comprising the step of orbiting the plurality of plasma ions in a diamagnetic direction within the FRC.

13. The method of claim 12, further comprising the step of substantially directing drift orbits of the plurality of plasma ions in the diamagnetic direction within the FRC.

14. The method of claim 13, wherein the step of directing drift orbits includes exerting electrostatic forces due to the electrostatic field on the plasma ions.

15. The method of claim 1, wherein the step of generating a second magnetic field includes the steps of rotating the plasma and generating a current.

16. The method of claim 15, further comprising the step of creating an azimuthal electric field within the chamber.

17. The method of claim 16, further comprising the steps of coupling the azimuthal electric field to the plasma ions and electrons and exerting ponderomotive forces due to the azimuthal electric field on the plasma ions and eletrons.

18. The method of claim 16, wherein the step of creating an azimuthal electric field includes increasing a current running through a flux coil.

19. The method of claim 1, wherein electrostatically confining the plurality of plasma electrons includes substantially eliminating anomalous transport of energy by the plurality of plasma electrons.

20. The method of claim 1, wherein electrostatically confining the plurality of plasma electrons includes directing the plurality of plasma electrons in counter-diagmagnetic orbits within the FRC.

21. The method of claim 1, further comprising the step of cooling the plurality of plasma electrons.

22. The method of claim 6, further comprising the step of forming fusion product ions from the plurality of plasma ions.

23. The method of claim 22, further comprising the step of transferring energy from the electric potential energy well of the electrostatic field to the fusion product ions.

24. The method of claim 1, wherein the plasma comprises at least two different ion species.

25. The method of claim 1, wherein the plasma comprises an advanced fuel.

26. The method of claim 1, wherein electrostatically confining the plurality of plasma electrons includes directing the plurality of plasma electrons in counter-diagmagnetic orbits within the FRC.

27. A method of confining a plasma, the method comprising the steps of:

generating a magnetic field within a confinement structure, the magnetic field having a topology of a field reversed configuration (FRC);

generating an electrostatic field within the confinement structure, the electrostatic field forming a electric potential energy well;

tuning an applied magnetic field to control the magnitude of the electric potential energy well, and

confining a plasma within the confinement structure, the plasma comprising ions and electrons, wherein the ions are substantially confined magnetically within the FRC magnetic field and the electrons are substantially confined electrostatically within the electric potential energy well.

28. The method of claim 27, wherein the step of tuning an applied magnetic field includes increasing the magnitude of the electrostatic field.

29. The method of claim 28, wherein the step of generating the electrostatic field includes the steps of rotating the plasma in a diagmagnetic direction within the FRC and creating an excess positive charge due to electrons leaving the plasma.

30. The method of claim 29, wherein the step of creating an excess positive charge includes exerting Lorentz forces on the plasma electrons.

31. The method of claim 27, wherein the confining step includes substantially classically containing the ions.

32. The method of claim 31, wherein the confining step includes substantially classically containing the electrons.

33. The method of claim 31, wherein classically containing the ions includes containing the ions within the confinement structure for a period of time greater than a burn time of the plasma.

34. The method of claim 33, further comprising the step of forming fusion product ions.

35. The method of claim 34, further comprising the step of exiting the fusion product ions from the FRC in an annular beam.

36. The method of claim 34, further comprising the step of transferring energy from the electric potential energy well of the electrostatic field to the fusion product ions.

37. The method of claim 31, wherein classically containing the ions includes substantially eliminating anamolous transport of ions.

38. The method of claim 31, wherein the ions are substantially non-adiabatic.

39. The method of claim 38, wherein the ions are substantially energetic.

40. The method of claim 31, further comprising the step of orbiting the ions within the FRC in large radius betatron orbits wherein the orbit radius exceeds the wavelengths of anomalous transport causing fluctuations.

41. The method of claim 27, wherein the step of magnetically confining the ions includes causing the ions to orbit within the FRC due to Lorenz forces acting on the ions.

42. The method of claim 41, further comprising the step of orbiting the ions in a diamagnetic direction.

43. The method of claim 42, further comprising the step of substantially directing ion drift orbits in the diamagnetic direction.

44. The method of claim 43, wherein the step of directing drift orbits includes exerting electrostatic forces due to the electrostatic field on the plasma ions.

45. The method of claim 27, further comprising the step of rotating the plasma and generating a current to form a magnetic self-field surrounding the plasma.

46. The method of claim 45, further comprising the step of combining the applied magnetic field and the magnetic self-field to form the FRC magnetic field.

47. The method of claim 46, further comprising the step of creating an azimuthal electric field within the confinement structure.

48. The method of claim 47, further comprising the steps of coupling the azimuthal electric field to the plasma ions and electrons and exerting ponderomotive forces on the plasma ions and eletrons.

49. The method of claim 48, wherein the step of creating an azimuthal electric field includes increasing a current running through a flux coil.

50. The method of claim 27, wherein electrostatically confining the electrons includes substantially eliminating anomalous transport of energy by the electrons.

51. The method of claim 27, further comprising the step of cooling the electrons.

52. The method of claim 27, wherein the plasma comprises at least two different ion species.

53. The method of claim 27, wherein the plasma comprises an advanced fuel.

54. A method of confining a plasma having electrons and ions, the method comprising the steps of:

creating a magnetic field within a confinement structure, the magnetic field having a field reversed configuration (FRC) topology,

creating an electrostatic field within the confinement structure, the electrostatic field forming an electrostatic potential energy well,

magnetically confining a plurality of plasma ions within the confinement structure,

electrostatically confining a plurality of plasma electrons within the electrostatic potential energy well formed within the confinement structure, and

tuning the electrostatic potential energy well.

55. The method of claim 54, wherein the step of tuning the electrostatic field includes increasing the magnitude of the electrostatic field.

56. The method of claim 54, wherein the step of tuning the electrostatic field includes manipulating the magnitude of an applied magnetic field.

57. The method of claim 56, wherein the step of generating the electrostatic field includes the steps of rotating the plasma in a diagmagnetic direction within the FRC and creating an excess positive charge due to electrons leaving the plasma.

58. The method of claim 57, wherein the step of creating an excess positive charge includes exerting Lorentz forces on the plasma electrons.

59. The method of claim 54, wherein the confining step includes substantially classically containing the ions.

60. The method of claim 59, wherein the confining step includes substantially classically containing the electrons.

61. The method of claim 59, wherein classically containing the ions includes containing the ions within the confinement structure for a period of time greater than a burn time of the plasma.

62. The method of claim 61, further comprising the step of forming fusion product ions.

63. The method of claim 62, further comprising the step of exiting the fusion product ions from the FRC in an annular beam.

64. The method of claim 62, further comprising the step of transferring energy from the electrostatic potential energy well of the electrostatic field to the fusion product ions.

65. The method of claim 59, wherein classically containing the ions includes substantially eliminating anamolous transport of ions.

66. The method of claim 59, wherein the ions are substantially non-adiabatic.

67. The method of claim 66, wherein the ions are substantially energetic.

68. The method of claim 59, further comprising the step of orbiting the ions within the FRC in large radius betatron orbits.

69. The method of claim 68, wherein the orbit radius of the betatron orbits exceeds the wavelengths of anomalous transport causing fluctuations.

70. The method of claim 54, wherein the step of magnetically confining the ions includes causing the ions to orbit within the FRC due to Lorenz forces acting on the plurality of plasma ions.

71. The method of claim 70, further comprising the step of orbiting the ions in a diamagnetic direction.

72. The method of claim 71, further comprising the step of substantially directing ion drift orbits in the diamagnetic direction.

73. The method of claim 72, wherein the step of directing drift orbits includes exerting electrostatic forces from the electrostatic field on the plasma ions.

74. The method of claim 54, wherein the step of creating a magnetic field includes the step of generating an applied magnetic field within the confinement structure.

75. The method of claim 74, further comprising the step of rotating the plasma and generating a current to form a magnetic self-field surrounding the plasma.

76. The method of claim 75, further comprising the step of combining the applied magnetic field and the magnetic self-field to form the FRC magnetic field.

77. The method of claim 75, further comprising the step of creating an azimuthal electric field within the confinement structure.

78. The method of claim 77, further comprising the steps of coupling the azimuthal electric field to the plasma ions and electrons and exerting ponderomotive forces on the plasma ions and electrons.

79. The method of claim 78, wherein the step of creating an azimuthal electric field includes increasing a current running through a flux coil.

80. The method of claim 54, wherein electrostatically confining the electrons includes substantially eliminating anomalous transport of energy by the electrons.

81. The method of claim 54, wherein electrostatically confining the plurality of plasma electrons includes directing the plurality of plasma electrons in counter-diagmagnetic orbits within the FRC.

82. The method of claim 54, further comprising the step of cooling the electrons.

83. The method of claim 54, wherein the plasma comprises at least two different ion species.

84. The method of claim 54, wherein the plasma comprises an advanced fuel.