Publication: Emergence and decay rate of the edge plasma flow shear near a critical transition
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ISSN: 0741-3335 (Print)
ISSN: 1361-6587 (Online)
Publication date
2009-01
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IOP Publishing
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Abstract
Recently, the experimental results for the emergence of the plasma shear flow layer in TJ-II have been explained as a second-order phase transition like process by using a simple model of envelope equations for the fluctuation level, the averaged poloidal velocity shear and the pressure gradient (2006 Phys. Plasmas 13 122509). Here, we extend this model by incorporating radial coupling. The model is applied to the study of the turbulence-shear flow interaction when the energy flux is low. Transition dynamics and their concomitant thresholds are examined within the context of this model. The effect of an external torque induced by electrode biasing has also been considered. In particular, we analyze the decay rate of the shear flow after switching off the biasing.
Description
16 pages, 14 figures.-- PACS nrs.: 52.35.Ra, 52.30.-q, 52.70.-m, 52.25.Gj, 52.25.Fi.-- Special section: Papers from the 10th International Workshop on Fast Ignition of Fusion Targets (Hersonissos, Crete, Greece, Jun 12-18, 2008).
Keywords
[PACS] Plasma turbulence, [PACS] Plasma dynamics and flow, [PACS] Plasma diagnostic techniques and instrumentation, [PACS] Fluctuation and chaos phenomena, [PACS] Transport properties
Bibliographic citation
Plasma Physics and Controlled Fusion, 2009, vol. 51, n. 1, id 015003