On plasma rotation induced by waves in tokamaks

Xiaoyin Guan, I. Y. Dodin, Hong Qin, Jian Liu, N. J. Fisch

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The momentum conservation for resonant wave-particle interactions, now proven rigorously and for general settings, is applied to explain in simple terms how tokamak plasma is spun up by the wave momentum perpendicular to the dc magnetic field. The perpendicular momentum is passed through resonant particles to the dc field and, giving rise to the radial electric field, is accumulated as a Poynting flux; the bulk plasma is then accelerated up to the electric drift velocity proportional to that flux, independently of collisions. The presence of this collisionless acceleration mechanism permits varying the ratio of the average kinetic momentum absorbed by the resonant-particle and bulk distributions depending on the orientation of the wave vector. Both toroidal and poloidal forces are calculated, and a fluid model is presented that yields the plasma velocity at equilibrium.

Original languageEnglish (US)
Article number102105
JournalPhysics of Plasmas
Issue number10
StatePublished - Oct 2013

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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