Plasma and Fusion Research

Volume 7, 1403077 (2012)

Regular Articles

Bootstrap Current Simulations with Experimental LHD Plasma Density and Temperature Profiles, Energy Scattering and Finite Orbit Width

Maxim Yu. ISAEV, Kiyomasa Y. WATANABE¹⁾, Shinsuke SATAKE¹⁾, Yuji NAKAMURA²⁾ and Wilfred A. COOPER³⁾

: National Research Centre “Kurchatov Institute”, Moscow, 123182, Russia
1): National Institute for Fusion Science, Toki 509-5292, Japan
2): Graduate School of Energy Science, Kyoto University, Uji 611-0011, Japan
3): Ecole Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, CH-1015 Lausanne, Switzerland

(Received 6 December 2011 / Accepted 26 April 2012 / Published 26 July 2012)

Abstract

Bootstrap current calculations with the neoclassical SPBSC and VENUS+δf codes have been performed on experimental Large Helical Device (LHD, NIFS, Japan) configurations with different magnetic axis positions and simplified plasma density and temperature profiles. In this paper, we use experimentally obtained electron density and temperature profiles for the LHD discharges #61863 and #82582 to compute the corresponding magnetohydrodynamic equilibrium states and collisional frequency. An improved collisional operator has been implemented into the VENUS+δf code. The comparison between the measured LHD bootstrap current and that expected from neoclassical simulations is discussed.

Keywords

heliotron, stellarator, magnetic configuration, neoclassical transport, bootstrap current, 3D numerical orbit, δf method

DOI: 10.1585/pfr.7.1403077

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This paper may be cited as follows:

Maxim Yu. ISAEV, Kiyomasa Y. WATANABE, Shinsuke SATAKE, Yuji NAKAMURA and Wilfred A. COOPER, Plasma Fusion Res. 7, 1403077 (2012).