Time-step dependent force interpolation scheme for suppressing numerical Cherenkov instability in relativistic particle-in-cell simulations

Lu, Yingchao; Kilian, Patrick; Guo, Fan; Li, Hui; Liang, Edison

doi:10.1016/j.jcp.2020.109388

Title: Time-step dependent force interpolation scheme for suppressing numerical Cherenkov instability in relativistic particle-in-cell simulations

Journal Article · Mon Mar 30 00:00:00 EDT 2020 · Journal of Computational Physics

DOI:https://doi.org/10.1016/j.jcp.2020.109388· OSTI ID:1825431

^[1];

^[2]; Guo, Fan ^[2]; Li, Hui ^[2]; Liang, Edison ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Rice Univ., Houston, TX (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Rice Univ., Houston, TX (United States)

The WT scheme, a piecewise polynomial force interpolation scheme with time-step dependency, is proposed in this paper for relativistic particle-in-cell (PIC) simulations. The WT scheme removes the lowest order numerical Cherenkov instability (NCI) growth rate for arbitrary time steps allowed by the Courant condition. While NCI from higher order resonances is still present, the numerical tests show that for smaller time steps, the numerical instability grows much slower than using the optimal time step found in previous studies. The WT scheme is efficient for improving the quality and flexibility of relativistic PIC simulations.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1825431

Alternate ID(s):: OSTI ID: 1615098

Report Number(s):: LA-UR-19-29419; TRN: US2215808

Journal Information:: Journal of Computational Physics, Vol. 413; ISSN 0021-9991

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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References (15)

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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