A fluid-kinetic framework for self-consistent runaway-electron simulations

The problem of self-consistently coupling kinetic runaway-electron physics to the macroscopic evolution of the plasma is addressed by dividing the electron population into a bulk and a tail. A probabilistic closure is adopted to determine the coupling between the bulk and the tail populations, prese...

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Bibliographic Details
Published in:Physics of plasmas 2018-06, Vol.25 (6)
Main Authors: Hirvijoki, Eero, Liu, Chang, Zhang, Guannan, del-Castillo-Negrete, Diego, Brennan, Dylan P.
Format: Article
Language:English
Subjects:
Coupling
Distribution functions
Electrons
Kinetic equations
Plasma physics
Plasmas (physics)
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Summary:The problem of self-consistently coupling kinetic runaway-electron physics to the macroscopic evolution of the plasma is addressed by dividing the electron population into a bulk and a tail. A probabilistic closure is adopted to determine the coupling between the bulk and the tail populations, preserving them both as genuine, non-negative distribution functions. Macroscopic one-fluid equations and the kinetic equation for the runaway-electron population are then derived, now displaying sink and source terms due to transfer of electrons between the bulk and the tail.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5030424