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 (sωR/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.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)