Nonlinear saturation of shear Alfvén modes and self-consistent energetic ion transport in burning plasmas with advanced Tokamak equilibria

Nonlinear Dynamics of Shear Alfvén Modes and Energetic Ion Confinement in Optimized Shear Tokamak Equilibria

Collective Effects and Self-Consistent Energetic Particle Dynamics in Advanced Tokamaks

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 ...

Interaction of fast particles and Alfvén modes in burning plasmas

In this paper we study the interaction of fast particles with Alfvénic instabilities in Tokamak plasmas, with reference to present-day experiments that exploit strong energetic particle heating (namely, JT-60U [1]) and the consistency of proposed ITER burning plasma scenarios [2]. Concerning JT-60U, two different types of bursting modes have been observed by MHD spectrography in auxiliary heate...

Particle-in-cell investigation of the nonlinear saturation of Shear Alfvén Modes in hollow-q-profile tokamaks

The stability and dynamics of Shear Alfvén modes in Tokamak equilibria characterized by non-monotonic q profiles is a relevant issue in the investigation of auxiliary-heated as well as ignited-plasma properties because of the role that such q profiles could play in obtaining improved confinement regimes. Two main elements could play a specific role in determining the Alfvén mode behaviour in th...

An extended hybrid magnetohydrodynamics gyrokinetic model for numerical simulation of shear Alfvén waves in burning plasmas

Adopting the theoretical framework for the generalized fishbonelike dispersion relation, an extended hybrid magnetohydrodynamics gyrokinetic simulation model has been derived analytically by taking into account both thermal ion compressibility and diamagnetic effects in addition to energetic particle kinetic behaviors. The extended model has been used for implementing an extended version of hyb...