Radio frequency induced and neoclassical asymmetries and their effects on turbulent impurity transport in a tokamak
Journal article, 2014

Poloidal asymmetries in the impurity density can be generated by radio frequency heating in the core and by neoclassical effects in the edge of tokamak plasmas. In a pedestal case study, using global neoclassical simulations we find that finite orbit width effects can generate significant poloidal variation in the electrostatic potential, which varies on a small radial scale. Gyrokinetic modeling shows that these poloidal asymmetries can be strong enough to significantly modify turbulent impurity peaking. In the pedestal the ExB drift in the radial electric field can give a larger contribution to the poloidal motion of impurities than that of their parallel streaming. Under such circumstances we find that up-down asymmetries can also affect impurity peaking.

Author

Istvan Pusztai

Chalmers, Applied Physics, Nuclear Engineering

Matt Landreman

Albert Mollén

Chalmers, Applied Physics, Nuclear Engineering

Yevgen Kazakov

Tünde Fülöp

Chalmers, Applied Physics, Nuclear Engineering

Contributions to Plasma Physics

0863-1042 (ISSN) 1521-3986 (eISSN)

Vol. 54 534-

Driving Forces

Sustainable development

Areas of Advance

Energy

Subject Categories

Fusion, Plasma and Space Physics

More information

Created

10/7/2017