Collisional bulk ion transport and poloidal rotation driven by neutral beam injection
- H. H. Wills Physics Laboratory, University of Bristol, Royal Fort, Tyndall Avenue, Bristol BS8 1TL (United Kingdom)
Neutral beam injection (NBI) is known to significantly affect radial transport in a tokamak plasma. Furthermore, recent observations have shown poloidal velocities, in the presence of NBI, significantly in excess of the standard neoclassical value. Motivated by this, the additional collisional radial bulk ion fluxes of particles, heat and toroidal angular momentum, and the poloidal velocity, driven by fast ions from NBI have been evaluated for a low-collisionality, pure plasma, with strong toroidal rotation and arbitrary aspect ratio. Higher order velocity space structure of the fast ion distribution function can be significant, whilst the effects of toroidal acceleration caused by strong NBI dominate at large aspect ratio. The driven poloidal velocity depends strongly on system parameters, becoming larger at higher beam density and lower beam energy.
- OSTI ID:
- 20975109
- Journal Information:
- Physics of Plasmas, Vol. 14, Issue 6; Other Information: DOI: 10.1063/1.2734181; (c) 2007 U.S. Government; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of beam-driven poloidal rotation on the neoclassical bootstrap current
Control of plasma rotation by controlling the content of highly collisional ions in strongly rotating tokamak plasmas with unbalanced neutral beam injection