Onset and Saturation of Ion Heating by Odd-Parity Rotating Magnetic Fields in a Field-Reversed Configuration
Abstract
Heating of figure-8 orbit ions by odd-parity rotating magnetic fields (RMFo) applied to an elongated field-reversed configuration (FRC) is investigated. The largest energy gain occurs at resonances (s≡ωR/ω) of the RMFo frequency, ωR, with the figure-8 orbital frequency, ω, and is proportional to s2 for s-even resonances and to s for s-odd resonances. The threshold for the transition from regular to stochastic orbits explains both the onset and saturation of heating. The FRC magnetic geometry lowers the threshold for heating below that in the tokamak by an order of magnitude.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 2006
- DOI:
- 10.1103/PhysRevLett.96.015002
- arXiv:
- arXiv:1101.4774
- Bibcode:
- 2006PhRvL..96a5002L
- Keywords:
-
- 52.50.Qt;
- 05.45.-a;
- 52.55.Lf;
- 52.65.Cc;
- Plasma heating by radio-frequency fields;
- ICR ICP helicons;
- Nonlinear dynamics and chaos;
- Field-reversed configurations rotamaks astrons ion rings magnetized target fusion and cusps;
- Particle orbit and trajectory;
- Nonlinear Sciences - Chaotic Dynamics;
- Physics - Plasma Physics
- E-Print:
- 4 page, 3 figures