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Global anomalous transport of ICRH and NBI-heated fast ions

George Wilkie (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; István Pusztai (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; Ian Abel (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; W Dorland ; Tünde Fülöp (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers))
Plasma Physics and Controlled Fusion (0741-3335). Vol. 59 (2017), 4, p. 044007.
[Artikel, refereegranskad vetenskaplig]

By taking advantage of the trace approximation, one can gain an enormous computational advantage when solving for the global turbulent transport of impurities. In particular, this makes feasible the study of non-Maxwellian transport coupled in radius and energy, allowing collisions and transport to be accounted for on similar time scales, as occurs for fast ions. In this work, we study the fully-nonlinear ITG-driven trace turbulent transport of locally heated and injected fast ions. Previous results indicated the existence of MeV-range minorities heated by cyclotron resonance, and an associated density pinch e ect. Here, we build upon this result using the t3core code to solve for the distribution of these minorities, consistently including the e ects of collisions, gyrokinetic turbulence, and heating. Using the same tool to study the transport of injected fast ions, we contrast the qualitative features of their transport with that of the heated minorities. Furthermore, we move beyond the trace approximation to develop a model which allows one to easily account for the reduction of anomalous transport due to the presence of fast ions in electrostatic turbulence.

Nyckelord: Cyclotron resonance; Cyclotrons; Particle beam injection; Turbulence Fast ions; Gyrokinetics; Microturbulence; non-Maxwellian; transport

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Denna post skapades 2016-08-27. Senast ändrad 2017-04-19.
CPL Pubid: 240857