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Ballooning Modes Instabilities in Outward LHD Configurations

Jacobo VARELA, Kiyomasa Y. WATANABE¹⁾, Noriyoshi NAKAJIMA¹⁾, Satoshi OHDACHI¹⁾, Luis GARCIA and Jose A. MIER

Universidad Carlos III, 28911 Leganés, Madrid, Spain

1)

National Institute for Fusion Science, Oroshi-cho 322-6, Toki 509-5292, Japan

(Received 21 October 2010 / Accepted 2 February 2011 / Published 15 April 2011)

Abstract

The aim of this 3D ballooning mode growth rates study is to point out the existence of ballooning activity in outward LHD configurations near the edge, and to find out how these instabilities are triggered in equilibria that simulate plasmas of high density core operations with internal transport barrier. 3D ballooning mode growth rates and Mercier stability were studied for several magnetic configurations with different beta values, and the research reveals an intense activity in outward configurations near the plasma edge, where Mercier criterion predicts stability for interchange modes and experimental data situates the density collapse events [S. Ohdachi et al., Contrib. Plasma Phys. 50, 552 (2010)].

Copyright (c) 2011 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

nuclear fusion, LHD, MHD, ballooning

DOI: 10.1585/pfr.6.1403013

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This paper may be cited as follows:

Jacobo VARELA, Kiyomasa Y. WATANABE, Noriyoshi NAKAJIMA, Satoshi OHDACHI, Luis GARCIA and Jose A. MIER, Plasma Fusion Res. 6, 1403013 (2011).