TITLE

Characteristics of confinement and stability in large helical device edge plasmas

AUTHOR(S)
Komori, A.; Sakakibara, S.; Morisaki, T.; Watanabe, K. Y.; Narushima, Y.; Toi, K.; Ohdachi, S.; Masuzaki, S.; Kobayashi, M.; Shoji, M.; Ohyabu, N.; Ida, K.; Tanaka, K.; Kawahata, K.; Narihara, K.; Morita, S.; Peterson, B. J.; Sakamoto, R.; Yamada, H.; Ikeda, K.
PUB. DATE
May 2005
SOURCE
Physics of Plasmas;May2005, Vol. 12 Issue 5, p056122
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Recent progress in the heating capability in the large helical device [O. Motojima et al., Phys. Plasmas 6, 1843 (1999)] has allowed the highest average β value (4.1%) obtained in the helical devices, and enables exploration of magnetohydrodynamics (MHD) stability in this β region. MHD activities in the periphery are found to become stable spontaneously from the inner region to the outer region when the averaged β value exceeds a threshold, and then a flattening of the electron temperature profile is observed around the resonant surface. Such a flattening can be formed externally by producing an m/n=1/1 magnetic island, and the complete stabilization of the m/n=1/1 mode is demonstrated by the moderate island width. In addition, attempts to control peripheral plasmas are also performed by using a limiter and a local island divertor utilizing the m/n=1/1 island, to improve plasma confinement and, especially, to stabilize pressure-driven modes in the present study. The stabilization of peripheral MHD modes is obtained with both approaches, and this indicates that these are available to the production of higher-β plasmas without edge MHD activities.
ACCESSION #
17106222

 

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