Off-axis electron cyclotron heating and the sandpile paradigm for transport in tokamak plasmas
UNSPECIFIED. (2004) Off-axis electron cyclotron heating and the sandpile paradigm for transport in tokamak plasmas. PHYSICS OF PLASMAS, 11 (2). pp. 659-665. ISSN 1070-664XFull text not available from this repository.
Official URL: http://dx.doi.org/10.1063/1.1639017
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|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||PHYSICS OF PLASMAS|
|Publisher:||AMER INST PHYSICS|
|Official Date:||February 2004|
|Number of Pages:||7|
|Page Range:||pp. 659-665|
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