Plasma and Fusion Research

Volume 16, 1201083 (2021)

Rapid Communications

Ion Mass Dependence of Resistive Drift Wave Turbulence in Cylindrical Plasmas
Naohiro KASUYA1,2), Masanobu ISHIDA2), Yudai IMAHASHI2) and Masatoshi YAGI3)
1)
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
2)
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
3)
National Institute for Quantum and Radiological Science and Technology, Obuchi, Rokkasho-mura, Aomori 039-3212, Japan
(Received 19 March 2021 / Accepted 5 May 2021 / Published 18 June 2021)

Abstract

Resistive drift wave instability is one of the driving sources of turbulence in linear devices, and its ion mass dependence on structural formation is investigated by turbulence simulation. Modes are less unstable in the case with smaller mass ions, because the normalized density gradient length becomes larger with larger Larmor radius, but can be unstable considering the change of ion-neutral collision frequency. Nonlinear calculations show that a large number of modes with larger axial mode numbers are linearly unstable and their nonlinear couplings induce turbulence with a zonal flow in the case of smaller mass ions as helium.

Keywords

resistive drift wave instability, ion mass number, linear device, simulation

DOI: 10.1585/pfr.16.1201083

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