Magnetic and electrostatic confinement of plasma with tuning of electrostatic field
View Patent ↗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.
1. A method of confining a plasma having electrons and ions within a confinement structure, the method comprising the steps of:
magnetically confining a plurality of plasma ions within a confinement structure within a field reversed configuration (FRC) magnetic field,
electrostatically confining a plurality of plasma electrons within an electrostatic potential energy well formed within the confinement structure, and
generating the electrostatic potential energy well at a magnitude corresponding to the magnitude of an applied magnetic field.
2. The method of claim 1 , further comprising the step of tuning the electrostatic field.
3. The method of claim 2 , wherein the step of tuning the electrostatic field includes adjusting 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 diamagnetic 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 step of confining a plurality of plasma ions includes substantially classically containing the ions.
7. The method of claim 6 , wherein the step of confining a plurality of plasma electrons includes substantially classically containing the electrons.
8. The method of claim 6 , 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.
9. The method of claim 6 , wherein classically containing the ions includes substantially eliminating anomalous transport of ions.
10. The method of claim 1 , wherein the ions are substantially non-adiabatic.
11. The method of claim 10 , wherein the ions are substantially energetic.
12. The method of claim 1 , further comprising the step of orbiting the ions within the FRC in large radius betatron orbits.
13. The method of claim 12 , wherein the orbit radius of the betatron orbits exceed the wavelengths of anomalous transport causing fluctuations.
14. The method of claim 1 , 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.
15. The method of claim 14 , further comprising the step of orbiting the ions in a diamagnetic direction.
16. The method of claim 15 , further comprising the step of substantially directing the drift orbits in the diamagnetic direction.
17. The method of claim 16 , wherein the step of directing ion drift orbits in the diamagnetic direction includes exerting electrostatic forces from the electrostatic field on the plasma ions.
18. The method of claim 1 , further comprising the steps of generating an applied magnetic field within the confinement structure and rotating the plasma and generating a current to form a magnetic self-field surrounding the plasma.
19. The method of claim 18 , further comprising the step of forming a magnetic field having a field reversed configuration (FRC).
20. The method of claim 19 , wherein the step of forming the FRC includes combining the applied magnetic field and the magnetic self-field to form the FRC magnetic field.
21. The method of claim 18 , further comprising the step of creating an azimuthal electric field within the confinement structure.
22. The method of claim 21 , 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.
23. The method of claim 22 , wherein the step of creating an azimuthal electric field includes increasing a current running through a flux coil.
24. The method of claim 1 , wherein electrostatically confining the electrons includes substantially eliminating anomalous transport of energy by the electrons.
25. The method of claim 1 , wherein electrostatically confining the plurality of plasma electrons includes directing the plurality of plasma electrons in counter-diamagnetic orbits within the FRC.
26. A method of claim 1 , further comprising the step of cooling the electrons.
27. The method of claim 8 , further comprising the step of forming fusion product ions.
28. The method of claim 27 , further comprising the step of exiting the fusion product ions from the FRC.
29. The method of claim 28 , wherein the step of exiting the fusion productions includes exiting the fusion products in an annular beam.
30. The method of claim 28 , further comprising the step of transferring energy from the electrostatic potential energy well of the electrostatic field to the fusion product ions.
31. The method of claim 1 , wherein the plasma comprises at least two different ion species.
32. The method of claim 1 , wherein the plasma comprises an advanced fuel.