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Two-Dimensional Axisymmetric Finite Element Simulation of Lower Hybrid Wave with an Iterative Scheme

Fumiya ADACHI, Naoto TSUJII, Akira EJIRI, Kouji SHINOHARA, Seowon JANG, Yi PENG, Kotaro IWASAKI, Yu-Ting LIN, Zhengnan JIANG, Yiming TIAN, Yangguang JIANG, Shengyu WANG, Yijin XIONG and Masaru YOSHIDA

University of Tokyo, Kashiwa 277-0882, Japan

(Received 27 October 2023 / Accepted 25 June 2024 / Published 23 July 2024)

Abstract

Simulating waves in hot plasmas in configuration space is a difficult problem because of the non-local property of the plasma response, which makes the wave equation an integro-differential one. In this research, we conducted an axisymmetric hot plasma full wave simulation at the lower hybrid frequency range with the finite element method. Kinetic effects were introduced in the direction parallel to the magnetic field. We implemented the code so that it can handle an arbitrary velocity distribution function to introduce electron kinetics. An iterative method was utilized to introduce the non-local hot plasma contribution, which is more memory efficient than direct solving. The hot plasma perturbed current density was iteratively calculated in our scheme. For the present simulation, we used the plasma equilibrium obtained by the experiment with the TST-2 spherical tokamak, which is located at the University of Tokyo. The simulation with the realistic profiles successfully converged. The electron heating power deposition profile was estimated for the obtained electric field solutions.

Copyright (c) 2024 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

lower hybrid wave, full wave simulation, finite element method

DOI: 10.1585/pfr.19.1403026

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