Energetic ion transport by microturbulence is insignificant in tokamaks
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منابع مشابه
Gyrokinetic Simulation of Energetic Particle Turbulence and Transport
The fully self-consistent simulation of energetic particle turbulence and transport in burning plasmas such as ITER must incorporate three new physics elements: (i) kinetic effects of thermal particles at the thermal ion gyroradius (micro scale), (ii) nonlinear interactions of many meso scale (energetic particle gyroradius) shear Alfvén waves induced by the kinetic effects at the micro scale, a...
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Modelling of microturbulence-driven transport of energetic ions in an ITER steady-state scenario is presented. Results indicate that a significant fraction of the velocity space distribution of alpha particles and deuterium ions can be transported above neoclassical predictions. Turbulent magnetic fluctuations are found to significantly enhance the fast ion diffusivity. Overall, the conclusion ...
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Cross-field diffusion of energetic ions by microturbulence is measured during neutral-beam injection into the DIII-D tokamak. Fast-ion D(alpha), neutron, and motional Stark effect measurements diagnose the fast-ion distribution function. As expected for transport by plasma turbulence, anomalies relative to the classical prediction are greatest in high temperature plasmas, at low fast-ion energy...
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In the present paper, we address the issue of fast ion and fusion product transport in conditions that are typically relevant for burning plasmas operating in so called Advanced Tokamak regimes. Our results have direct implications, e.g., on the choice of current profiles for ITER steady state operations. We demonstrate that in a Tokamak equilibrium with hollow-q profile, in general, two types ...
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A thorough analysis of energetic particle modes ~EPM! stability and mode structures is presented for tokamaks with hollow q profiles. Focusing on the region near the minimum-q surface, EPM gap modes and resonant EPMs are shown to exist as solutions of the same dispersion relation. By controlling the fast ion distribution function, or, equivalently, their fundamental dynamical properties, a smoo...
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