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Off-axis electron cyclotron heating and the sandpile paradigm for transport in tokamak plasmas
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UNSPECIFIED (2004) Off-axis electron cyclotron heating and the sandpile paradigm for transport in tokamak plasmas. PHYSICS OF PLASMAS, 11 (2). pp. 659-665. doi:10.1063/1.1639017 ISSN 1070-664X.
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Official URL: http://dx.doi.org/10.1063/1.1639017
Abstract
Previous observations that suggest a substantial role for nondiffusive energy transport in tokamaks subjected to off-axis electron cyclotron heating (ECH) are compared to the output from a sandpile model. The observations considered include local and global aspects of temperature profile evolution in the DIII-D [for example, C. C. Petty and T. C. Luce, Nucl. Fusion 34, 121 (1994)] and RTP (Rijnhuizen Tokamak Project) [for example, M. R. de Baar, M. N. A. Beurskens, G. M. D. Hogeweij, and N. J. Lopes Cardozo, Phys. Plasmas 6, 4645 (1999)] tokamaks. The sandpile model employed is an extension, to incorporate noncentral fueling, of one used previously to address tokamak physics issues [S. C. Chapman, R. O. Dendy, and B. Hnat, Phys. Rev. Lett. 86, 2814 (2001)]. It is found that there are significant points of resemblance between the phenomenology of the noncentrally fueled sandpile and of the tokamaks with off-axis ECH. This suggests that the essential ingredient of the sandpile model, namely avalanching conditioned by a local critical gradient, may be one of the key transport effects generated by the tokamak plasma physics. (C) 2004 American Institute of Physics.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICS OF PLASMAS | ||||
Publisher: | AMER INST PHYSICS | ||||
ISSN: | 1070-664X | ||||
Official Date: | February 2004 | ||||
Dates: |
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Volume: | 11 | ||||
Number: | 2 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 659-665 | ||||
DOI: | 10.1063/1.1639017 | ||||
Publication Status: | Published |
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