Particle transport induced by electrostatic wave fluctuations

17th Brazilian Colloquium on Orbital Dynamics

Rosalem, K.C.^1 ; Roberto, M.^1 ; Caldas, I.L.^2

Departamento de Física, Instituto Tecnológico de Aeronáutica, São José dos Campos, SP

12228-900, Brazil^1

Instituto de Física, Universidade de São Paulo, São Paulo, SP

05315-970, Brazil^2

关键词: Chaotic trajectory;    Electrostatic waves;    Guiding centers;    Kinetic modeling;    Large aspect ratio;    Particle transport;    Spatial modes;    Symplectic map;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/641/1/012006/pdf
DOI  :  10.1088/1742-6596/641/1/012006

来源: IOP

【 摘 要 】

Particle transport driven by electrostatic waves at the plasma edge is numerically investigated, for large aspect ratio tokamaks, by considering a kinetic model derived from guiding-center equations of motion. Initially, the transport is estimated for trajectories obtained from differential equations for a wave spectrum generated by a dominant spatial mode and three time modes. Then, in case of infinite time modes, the differential equations of motion are used to introduce a symplectic map that allows to analyze the particle transport. The particle transport barriers are observed for spatial localized dominant perturbation and infinite modes. In presence of infinite spatial modes, periodic islands arise in between chaotic trajectories at the plasma edge.