Particle orbits in a force-balanced, wave-driven, rotating torus

I. E. Ochs, N. J. Fisch

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15 Scopus citations


A wave-driven rotating torus is a recently proposed fusion concept where the rotational transform is provided by the E × B drift resulting from a minor radial electric field. This field can be produced, for instance, by the RF-wave-mediated extraction of fusion-born alpha particles. In this paper, we discuss how macroscopic force balance, i.e., balance of the thermal hoop force, can be achieved in such a device. We show that this requires the inclusion of a small plasma current and vertical magnetic field and identify the desirable reactor regime through free energy considerations. We then analyze particle orbits in this desirable regime, identifying velocity-space anisotropies in trapped (banana) orbits, resulting from the cancellation of rotational transforms due to the radial electric and poloidal magnetic fields. The potential neoclassical effects of these orbits on the perpendicular conductivity, current drive, and transport are discussed.

Original languageEnglish (US)
Article number092513
JournalPhysics of Plasmas
Issue number9
StatePublished - Sep 1 2017

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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