Nonresonant Diffusion in Alpha Channeling

Ian E. Ochs, Nathaniel J. Fisch

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The gradient of fusion-born alpha particles that arises in a fusion reactor can be exploited to amplify waves, which cool the alpha particles while diffusively extracting them from the reactor. The corresponding extraction of the resonant alpha particle charge has been suggested as a mechanism to drive rotation. By deriving a coupled linear-quasilinear theory of alpha channeling, we show that, for a time-growing wave with a purely poloidal wave vector, a current in the nonresonant ions cancels the resonant alpha particle current, preventing the rotation drive but fueling the fusion reaction.

Original languageEnglish (US)
Article number025003
JournalPhysical review letters
Issue number2
StatePublished - Jul 9 2021

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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