Plasma and Fusion Research

Volume 11, 1203122 (2016)

Rapid Communications

Non-Ideal Ballooning Mode Instability with Real Electron Inertia
Haruki SETO, Masatoshi YAGI, Nobuyuki AIBA, Akinobu MATSUYAMA, Benjamin D. DUDSON1) and Xueqiao XU2)
National Institutes for Quantum and Radiological Science and Technology, Rokkasho 039-3212, Japan
1)
York Plasma Institute, Department of Physics, University of York, Heslington, York, YO10 5DD, UK
2)
Lawrence Livermore National Laboratory, CA 94550, USA
(Received 11 October 2016 / Accepted 26 October 2016 / Published 9 December 2016)

Abstract

Impacts of electron inertia with an electron skin depth (ESD) longer than the realistic value used in early numerical studies on non-ideal ballooning modes (NIBMs) are numerically investigated by a linearized 3-field reduced MHD model. In this paper, 4 different ESDs de∗ = 0, de, √10 de, 10de are used for a resistivity dependence study of the growth rate of NIBMs, where de = c0 √ε0me/nee2 is the real ESD and de∗ = 10de corresponds to an order of ESD used in a numerical study on collisionless ballooning mode (CBM) reported in [Kleva and Guzdar Phys. Plasmas 6, 116 (1999)]. In the case with the real ESD de∗ = de, a transition from resistive ballooning mode (RBM) to CBM occurs in the edge relevant resistivity regime, while the electron inertia effect is overestimated and the growth rate is almost independent of resistivity in the cases with de∗ = √10 de and 10de. These results indicate that the real ESD is one of key factors for the edge stability and turbulence analysis.

Keywords

non-ideal ballooning mode, electron inertia effect, reduced MHD model, linear analysis

DOI: 10.1585/pfr.11.1203122

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