Turbulent transport of impurities and their effect on energy confinement
Journal article, 2013

By presenting linear and nonlinear gyrokinetic studies, based on a balanced neutral beam injection deuterium discharge from the DIII-D tokamak, we demonstrate that impurities alter the scaling of the transport on the charge and mass of the main species, and even more importantly, they can dramatically change the energy transport even in relatively small quantities. A poloidally varying equilibrium electrostatic potential can lead to a strong reduction or sign change of the impurity peaking factor due to the combined effect of the in–out impurity density asymmetry and the E × B drift of impurities. We present an approximate expression for the impurity peaking factor and demonstrate that impurity peaking is not significantly affected by impurity self-collisions.


Istvan Pusztai

Chalmers, Applied Physics, Nuclear Engineering

Albert Mollén

Chalmers, Applied Physics, Nuclear Engineering

Tünde Fülöp

Chalmers, Applied Physics, Nuclear Engineering

Jeff Candy

General Atomics

Plasma Physics and Controlled Fusion

0741-3335 (ISSN) 1361-6587 (eISSN)

Vol. 55 7 074012- 074012

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Fusion, Plasma and Space Physics



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