Momentum injection in tokamak plasmas and transitions to reduced transport

F. I. Parra, M. Barnes, E. G. Highcock, A. A. Schekochihin, S. C. Cowley

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

The effect of momentum injection on the temperature gradient in tokamak plasmas is studied. A plausible scenario for transitions to reduced transport regimes is proposed. The transition happens when there is sufficient momentum input so that the velocity shear can suppress or reduce the turbulence. However, it is possible to drive too much velocity shear and rekindle the turbulent transport. The optimal level of momentum injection is determined. The reduction in transport is maximized in the regions of low or zero magnetic shear.

Original languageEnglish (US)
Article number115004
JournalPhysical review letters
Volume106
Issue number11
DOIs
StatePublished - Mar 18 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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