Publications
Detailed Information
Residual zonal flows in tokamaks in the presence of energetic ions
Cited 12 time in
Web of Science
Cited 11 time in Scopus
- Authors
- Issue Date
- 2019-06
- Publisher
- Institute of Physics Publishing
- Citation
- Nuclear Fusion, Vol.59 No.6, p. 066026
- Abstract
- We investigate the residual zonal flow (Rosenbluth and Hinton 1998 Phys. Rev. Lett. 80 724) in the presence of fusion product alpha-particles in tokamak plasmas using the modern gyrokinetic approach in the electrostatic limit. The residual zonal flow is predicted to be enhanced considerably for ITER plasmas in the radial wave-number regime of k(r)rho(i,eff) similar to 10(-1), where rho(i,eff) is the Larmor radius of a thermal ion of background plasma consisting of Deuterium and Tritium. This is a consequence of the fact that larger Larmor radius (banana orbit width, rho(i,b)) of an energetic alpha-particle leads to an enhancement (a reduction) of the classical (neoclassical) polarizability at that wave-number regime compared to the case without alpha-particles. This enhancement is slightly more pronounced for the slowing-down distribution compared to the Maxwellian if T-e greater than or similar to 20 keV for E-alpha = 3.5 MeV. In addition, we find that the Rosenbluth-Hinton formula for the residual zonal flow level that has been derived for the Maxwellian equilibrium ion distribution remains valid in the long wavelength (k(r)rho(i,b) << 1) and high aspect ratio limit for any well-behaved ion distribution function which is isotropic in velocity space.
- ISSN
- 0029-5515
- Files in This Item:
- There are no files associated with this item.
Item View & Download Count
Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.