Bibliographic Citation
| Document | For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field. For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability. |
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| DOI | http://dx.doi.org/10.1063/1.871681 |
| Title | The dynamics of marginality and self-organized criticality as a paradigm for turbulent transport |
| Creator/Author | Newman, D.E. ; Carreras, B.A. [Oak Ridge National Laboratory, P.O. Box 2009, Oak Ridge, Tennessee 37831-8070 (United States)] ; Diamond, P.H. [University of California at San Diego, La Jolla, California 92093-0319 (United States)] ; Hahm, T.S. [Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States)] |
| Publication Date | 1996 May 01 |
| OSTI Identifier | OSTI ID: 283358 |
| DOE Contract Number | AC05-96OR22464;FG03-88ER53275 |
| Other Number(s) | Journal ID: PHPAEN; ISSN 1070-664X; TRN: TRN: 9608M0296 |
| Resource Type | Journal Article |
| Resource Relation | Journal Name: Physics of Plasmas; Journal Volume: 3; Journal Issue: 5; Other Information: PBD: May 1996 |
| Research Org | Oak Ridge National Laboratory |
| Subject | 70 PLASMA PHYSICS AND FUSION; MAGNETIC CONFINEMENT; TRANSPORT THEORY; TURBULENCE; SCALING LAWS; PLASMA INSTABILITY |
| Related Subject | SHEAR FLOW |
| Description/Abstract | A general paradigm, based on the concept of self-organized criticality (SOC), for turbulent transport in magnetically confined plasmas, has been recently suggested as an explanation for some of the apparent discrepancies between most theoretical models of turbulent transport and experimental observations of the transport in magnetically confined plasmas. This model describes the dynamics of the transport without relying on the underlying local fluctuation mechanisms. Computations based on a cellular automata realization of such a model have found that noise-driven SOC systems can maintain average profiles that are linearly stable (submarginal) and yet are able to sustain active transport dynamics. It is also found that the dominant scales in the transport dynamics in the absence of sheared flow are system scales rather than the underlying local fluctuation scales. The addition of sheared flow into the dynamics leads to a large reduction of the system-scale transport events and a commensurate increase in the fluctuation-scale transport events needed to maintain the constant flux. The dynamics of these models and the potential ramifications for transport studies are discussed. {copyright} {ital 1996 American Institute of Physics.} |
| Country of Publication | United States |
| Language | English |
| Format | Medium: X; Size: pp. 1858-1866 |
| System Entry Date | 2008 Sep 15 |
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