Evolution of the marker distribution in gyrokinetic $δf$ particle-in-cell simulations

Chen, Yang; Cheng, Junyi; Parker, Scott E.

doi:10.1063/5.0097207

Evolution of the marker distribution in gyrokinetic $δf$ particle-in-cell simulations

Journal Article · Wed Jul 06 00:00:00 EDT 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0097207· OSTI ID:1979111

^[1]; ^[2]; Parker, Scott E. ^[2]

University of Colorado, Boulder, CO (United States); OSTI
University of Colorado, Boulder, CO (United States)

The evolution of the particle weight in a δf particle-in-cell simulation depends on the marker distribution that can evolve in a turbulent field due to turbulent diffusion. When Monte Carlo methods are used to implement the test particle collision operator, or when the particle motion is not strictly Hamiltonian in a collisionless simulation, the marker distribution will evolve along the particle trajectory and, in general, cannot be known exactly. A two-dimensional numerical marker distribution is proposed as an approximation. It is shown to be advantageous over other common methods for evaluating the marker distribution in long-time turbulence simulations. A generalized two-weight δf-method is proposed to mitigate the marker evolution problem.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); University of Colorado, Boulder, CO (United States); University of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: SC0017992; SC0018271; AC02-05CH11231

OSTI ID:: 1979111

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 29; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Evolution of the marker distribution in gyrokinetic $δf$ particle-in-cell simulations

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