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Higher-order particle representation for particle-in-cell simulations. (English) Zbl 07503730

Summary: In this paper we present an alternative approach to the representation of simulation particles for unstructured electrostatic and electromagnetic PIC simulations. In our modified PIC algorithm we represent particles as having a smooth shape function limited by some specified finite radius, \( r_0\). A unique feature of our approach is the representation of this shape by surrounding simulation particles with a set of virtual particles with delta shape, with fixed offsets and weights derived from Gaussian quadrature rules and the value of \(r_0\). As the virtual particles are purely computational, they provide the additional benefit of increasing the arithmetic intensity of traditionally memory bound particle kernels. The modified algorithm is implemented within Sandia National Laboratories’ unstructured EMPIRE-PIC code, for electrostatic and electromagnetic simulations, using periodic boundary conditions. We show results for a representative set of benchmark problems, including electron orbit, a transverse electromagnetic wave propagating through a plasma, numerical heating, and a plasma slab expansion. Good error reduction across all of the chosen problems is achieved as the particles are made progressively smoother, with the optimal particle radius appearing to be problem-dependent.

MSC:

78Axx General topics in optics and electromagnetic theory
65Mxx Numerical methods for partial differential equations, initial value and time-dependent initial-boundary value problems
78Mxx Basic methods for problems in optics and electromagnetic theory

Software:

SPIS; OSIRIS; SHARP; PSC
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References:

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