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Density Collapse Events Observed in the Large Helical Device
Author(s) -
Ohdachi S.,
Sakamoto R.,
Miyazawa J.,
Morisaki T.,
Masuzaki S.,
Yamada H.,
Watanabe K.Y.,
Jacobo V.R.,
Nakajima N.,
Watanabe F.,
Takeuchi M.,
Toi K.,
Sakakibara S.,
Suzuki Y.,
Narushima Y.,
Yamada I.,
Mianami T.,
Narihara K.,
Tanaka K.,
Tokuzawa T.,
Kawahata K.
Publication year - 2010
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200900051
Subject(s) - ballooning , large helical device , plasma , physics , core (optical fiber) , beta (programming language) , diffusion , atomic physics , mechanics , tokamak , nuclear physics , thermodynamics , optics , computer science , programming language
A core density collapse (CDC) phenomenon is a rapid collapse events observed in super dense core (SDC) plasma with internal diffusion barrier (IDB) in the Large Helical Device (LHD). By CDC, the central beta is decreased by up to 50%. The collapse starts from the edge region of the plasma. CDCs appear with plasma parameters where the high–n ballooning modes are unstable at ϱ ∼ 0.8. With less collisional conditions, m = 1 type oscillations are observed with similar beta profile. The origin of the m = 1 oscillations is not clarified (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)