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Title: A Comprehensive Comparison of Relativistic Particle Integrators

Journal Article · · The Astrophysical Journal. Supplement Series (Online)

We compare relativistic particle integrators commonly used in plasma physics, showing several test cases relevant for astrophysics. Three explicit particle pushers are considered, namely, the Boris, Vay, and Higuera–Cary schemes. We also present a new relativistic fully implicit particle integrator that is energy conserving. Furthermore, a method based on the relativistic guiding center approximation is included. The algorithms are described such that they can be readily implemented in magnetohydrodynamics codes or Particle-in-Cell codes. Here, our comparison focuses on the strengths and key features of the particle integrators. We test the conservation of invariants of motion and the accuracy of particle drift dynamics in highly relativistic, mildly relativistic, and non-relativistic settings. The methods are compared in idealized test cases, i.e., without considering feedback onto the electrodynamic fields, collisions, pair creation, or radiation. The test cases include uniform electric and magnetic fields, $${\boldsymbol{E}}\times {\boldsymbol{B}}$$ fields, force-free fields, and setups relevant for high-energy astrophysics, e.g., a magnetic mirror, a magnetic dipole, and a magnetic null. These tests have direct relevance for particle acceleration in shocks and in magnetic reconnection.

Research Organization:
Columbia Univ., New York, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0016542
OSTI ID:
1542033
Journal Information:
The Astrophysical Journal. Supplement Series (Online), Vol. 235, Issue 1; ISSN 1538-4365
Publisher:
American Astronomical Society/IOPCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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Cited By (12)

Particle Orbits at the Magnetopause: Kelvin‐Helmholtz Induced Trapping journal August 2019
Generalized, Energy-conserving Numerical Simulations of Particles in General Relativity. I. Time-like and Null Geodesics journal July 2018
Generalized, Energy-conserving Numerical Simulations of Particles in General Relativity. II. Test Particles in Electromagnetic Fields and GRMHD journal February 2019
Preplasma effects on laser ion generation from thin foil targets journal January 2020
General-relativistic Resistive Magnetohydrodynamics with Robust Primitive-variable Recovery for Accretion Disk Simulations journal September 2019
On the Boris solver in particle-in-cell simulation journal November 2018
Generalized, energy-conserving numerical simulations of particles in general relativity. II. Test particles in electromagnetic fields and GRMHD text January 2018
PIC methods in astrophysics: simulations of relativistic jets and kinetic physics in astrophysical systems journal July 2021
Explicit volume-preserving numerical schemes for relativistic trajectories and spin dynamics journal April 2021
Generalized, Energy-conserving Numerical Simulations of Particles in General Relativity. I. Time-like and Null Geodesics journal July 2018
Generalized, Energy-conserving Numerical Simulations of Particles in General Relativity. II. Test Particles in Electromagnetic Fields and GRMHD journal February 2019
Optimisation of Thin Plastic Foil Targets for Production of Laser-Generated Protons in the GeV Range preprint January 2019

Figures / Tables (22)


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