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

Eero Hirvijoki, Chang Liu, Guannan Zhang, Diego Del-Castillo-Negrete, Dylan P. Brennan

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5 Scopus citations

Abstract

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.

Original languageEnglish
Article number062507
JournalPhysics of Plasmas
Volume25
Issue number6
DOIs
StatePublished - Jun 1 2018

Funding

The authors are grateful for the encouragement and support from Professor Amitava Bhattacharjee and the rest of the SCREAM collaboration. E.H., C.L., and D.B. acknowledge the support from the U.S. Department of Energy Contract Nos. DE-AC02–09-CH11466 and DE-SC0016268. D.d.-C.-N. and G.Z. acknowledge support from the U.S. Department of Energy at Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract No. DE-AC05–00OR22725. The views and opinions expressed herein do not necessarily reflect those of the U.S. Department of Energy. D.B. acknowledge the support from the U.S. Department of Energy Contract Nos. DE-AC02â€"09-CH11466 and DE-SC0016268. D.d.-C.-N. and G.Z. acknowledge support from the U.S. Department of Energy at Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract No. DE-AC05â€"00OR22725. The views and opinions expressed herein do not necessarily reflect those of the U.S. Department of Energy.

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