Formation of a field reversed configuration for magnetic and electrostatic confinement of plasma

• US 6,891,911 B2
• Filed: 12/23/2002
• Issued: 05/10/2005
• 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: Garate, Eusebio, Rostoker, Norman, Binderbauer, Michl, Bystritskii, Vitaly
• Primary Examiner(s): Lee, Wilson
• Application Number:
  US10/328,674
• Publication Number:
  US 20030221622A1
• Time in Patent Office: 869 Days
• Field of Search: 315/111.21, 315/111.41, 315/111.51, 315/111.61, 376/107, 376/128, 376/130, 376/133, 376/129, 376/141
• US Class Current: 376/128
• 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 forming a magnetic field with field reversed configuration (FRC) topology, comprising the steps of

energizing a plurality of field coils extending about a vessel,

forming a magnetic guide field extending axially within the vessel, the guide field including first and second radial magnetic field components in spaced relation to axially confine there between plasma injected into the vessel,

axially injecting plasma along the axial guide field and forming an annular plasma layer within the vessel, the plasma comprising charged particles including a plurality of electrons and a plurality of ions,

energizing a betatron flux coil concentric with a principle axis of the vessel by running current through the coil,

increasing the current running through the coil causing a change in axial flux in the interior of the coil,

creating an azimuthal electric field within the vessel due to the change in axial flux,

rotating the annular layer of plasma within the vessel,

generating a current due to the rotating plasma,

creating a magnetic poloidal self-field surrounding the rotating plasma, wherein field lines external to the annular plasma layer extend in the same direction as field lines of the guide field and field lines internal to the annular plasma layer extend in a direction opposite to the field lines of the guide field, and

increasing the self field to a magnitude at least comparable to the guide field and sufficient to cause field reversal.

2. The method of claim 1 further comprising the step of magnetically connecting open field lines of the guide field with field lines of the self field.

3. The method of claim 1 where in the step of rotating the annular layer of plasma includes

coupling the azimuthal electric field to the charged particles in the plasma, and

accelerating the charged plasma particles in the annular layer due to ponderomotive forces exerted on the particles by the azimuthal electric field.

4. The method of claim 1 wherein the step of forming the first and second radial field components of the guide field includes increasing current running through one or more coils at opposing ends of the plurality of field coils.

5. The method of claim 1 wherein the step of increasing the magnitude of the self-field includes increasing the rotational energy of the annular plasma layer.

6. The method of claim 5 wherein the step of increasing the rotational energy of the annular plasma layer includes increasing the rate of change of the current running through the flux coil.

7. The method of claim 5 wherein the rotational energy of the annular plasma layer is increased to a range of about 75 eV to 125 eV.

8. The method of claim 5 wherein the rotational energy of the annular plasma layer is increased to about 100 eV.

9. The method of claim 1 further comprising the step of increasing the rotational energy of the annular plasma layer to fusion relevant conditions.

10. The method of claim 9 wherein the rotational energy of the annular plasma layer is increased to a range of about 100 keV to 3.3 MeV.

11. The method of claim 9 wherein the rotational energy of the annular plasma layer is increased to about 200 keV.

12. The method of claim 9 further comprising the step of creating an electrostatic well with in the vessel.

13. The method of claim 12 further comprising the step of manipulating the magnitude of the guide field generated by the plurality of field coils to tune the magnitude of the electrostatic well.

14. The method of claim 13 further comprising the step of injecting ion beams of fusion level energy into the FRC and trapping the beams in betatron orbits within the FRC.

15. The method of claim 14 wherein the injected ion beams are at an energy level of about 100 keV to 3.3 MeV.

16. The method of claim 14 wherein the step of injecting and trapping the ion beams further comprises the steps of

neutralizing the ion beams,

draining the electric polarization from the neutralized ion beams, and

exerting a Lorentz force due to the FRC on the neutralized ion beams to bend the ion beams into betatron orbits.

17. The method of claim 16 further comprising the steps of magnetically confining ions within the FRC and electrostatically confining electrons within the electrostatic well.

18. The method of claim 17 further comprising the step of forming fusion product ions.

19. The method of claim 18 further comprising the step of exiting the fusion product ions from the FRC in an annular beam.

20. A method of forming a field reversed configuration magnetic field within a chamber comprising the steps of

creating a magnetic guide field in a chamber by energizing a plurality of field coils and mirror coils extending about the chamber,

injecting plasma into the chamber along the guide field,

creating an azimuthal electric field within the chamber causing the plasma to rotate and form a poloidal magnetic self-field surrounding the plasma,

increasing the rotational energy of the plasma to increase the magnitude of the self-field to a level that overcomes the magnitude of the guide field,

joining field lines of the guide field and the self-field in a magnetic field having a field reverse configuration (FRC) topology, and

increasing the magnitude of the guide field to maintain the rotating plasma at a predetermined radial size.

21. The method of claim 20 wherein the step of creating the azimuthal electric field includes the step of energizing a betatron flux coil within the chamber and increasing current running through the coil.

22. The method of claim 21 wherein the step of increasing the rotational energy of the rotating plasma includes increasing the rate of change of the current running through the coil.

23. The method of claim 22 further comprising the step of increasing the rate of change of the current running through the flux coil to accelerate the rotating plasma to fusion level rotational energy.

24. The method of claim 23 further comprising the step of creating an electrostatic well within the chamber.

25. The method of claim 24 further comprising the step of tuning the electrostatic well.

26. The method of claim 25 wherein the step of tuning the electrostatic well includes manipulating the magnitude of the guide field.

27. The method of claim 26 further comprising the steps of injecting ion beams of fusion level energy into the FRC and trapping the beams in betatron orbits within the FRC.

28. The method of claim 27 wherein the step of injecting and trapping the ion beams further comprises the steps of

neutralizing the ion beams,

draining the electric polarization from the neutralized ion beams, and

exerting a Lorentz force due to the applied magnetic field on the neutralized ion beams to bend the ion beams into betatron orbits.

29. The method of claim 28 further comprising the steps of magnetically confining ions within the FRC and electrostatically confining electrons within the electrostatic well.

30. The method of claim 29 further comprising the step of forming fusion product ions.

31. The method of claim 30 further comprising the step of exiting the fusion product ions from the FRC in an annular beam.

32. A method of forming a field reversed configuration magnetic field within a reactor chamber comprising the steps of

energizing field coils positioned about a chamber to create a magnetic guide field with axially extending field lines within the chamber,

injecting plasma comprising charged electron and ion particles into the chamber along the field lines of the guide field,

rotating the plasma by creating an azimuthal electric field within the chamber that applies ponderomotive forces to the charged particles,

forming a magnetic poloidal self field surrounding the rotating plasma due to the current carried by the rotating plasma, and

increasing the rotational energy of the plasma to increase the magnitude of the self-field to a level that overcomes the magnitude of the guide field causing field reversal.

33. The method of claim 32 further comprising the step of increasing the magnitude of the guide field to maintain the rotating plasma at a predetermined radial size.

34. The method of claim 33 wherein creating the azimuthal electric field includes the step of increasing current running through a betatron flux coil concentric with a principle axis of the chamber.

35. The method of claim 34 wherein the betatron flux coil includes a plurality of coils wound in parallel.

36. The method of claim 32 wherein the step of increasing the rotational energy of the plasma includes increasing the azimuthal electric field.

37. The method of claim 35 wherein increasing the azimuthal electric field includes increasing the rate of change of the current running through the betatron coil.

38. The method of claim 37 further comprising the step of accelerating the rotating plasma to fusion level rotational energy by increasing the rate of change of the current running through the betatron coil.

39. The method of claim 32 wherein the step of increasing the energy of the rotating plasma to cause field reversal includes accelerating the rotating plasma to a rotational energy of about 75 to 125 electron volts.

40. The method of claim 38 wherein the rotating plasma is accelerated to a rotational energy of about 100 kilo electron volts to 3.3 mega-electron volts.

41. The method of claim 38 further comprising the step of creating an electrostatic well within the chamber.

42. The method of claim 41 further comprising the step of tuning the electrostatic well.

43. The method of claim 42 wherein the step of tuning the electrostatic well includes manipulating the magnitude of the guide field.

44. The method of claim 43 further comprising the steps of injecting ion beams of fusion level energy into the magnetic field with field reversal within the chamber and trapping the beams in betatron orbits within the chamber.

45. The method of claim 44 wherein the injected ion beams are at an energy level of about 100 kilo electron volts to 3.3 mega-electron volts.

46. The method of claim 44 wherein the step of injecting the ion beams further comprises the steps of

neutralizing the ion beams,

draining the electric polarization from the neutralized ion beams, and

exerting a Lorentz force due to the FRC on the neutralized ion beams to bend the ion beams into betatron orbits.

47. The method of claim 46 further comprising the steps of magnetically confining ions within the FRC and electrostatically confining electrons within the electrostatic well.

48. The method of claim 47 further comprising the step of forming fusion product ions.

49. The method of claim 48 further comprising the step of exiting the fusion product ions from the FRC in an annular beam.