Physics Student Research

Document Type

Article

Journal/Book Title/Conference

Physics of Plasmas

Volume

25

Issue

8

Publisher

American Institute of Physics

Publication Date

8-10-2018

First Page

1

Last Page

10

DOI

https://doi.org/10.1063/1.5037110

Abstract

A novel iterative approach for solving discretized linear wave equations in a frequency domain, which combines time evolution with iterative relaxation schemes, is presented. In this hybrid approach, each iteration cycle consists of evolution of electromagnetic (EM) fields in time over a specified number of field periods followed by several iterative relaxations. Provided that there is sufficient dissipation, both the time evolution and the iterative relaxations contribute to the convergence of the EM fields to the solution of the formulated full wave boundary value problem. Time evolution rapidly distributes EM fields, propagating with group velocity, over the simulation domain, while the iterative relaxations smooth the fields, reducing the numerical errors such that iteration cycles converge to a steady state solution, approximating the solution of the formulated problem. This approach is intended for large scale simulations which are beyond the capabilities of direct solvers presently used for solving wave equations in the frequency domain. The technique is demonstrated for solving wave equations on a regular grid using a cold plasma dielectric model with collisions for 2D modeling of EM fields in tokamak in an electron cyclotron frequency range.

Comments

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Physics of Plasmas 25, 082509 (2018); doi: 10.1063/1.5037110 and may be found at https://aip.scitation.org/doi/10.1063/1.5037110

Available for download on Saturday, August 10, 2019

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