Intrinsic momentum generation by a combined neoclassical and turbulence mechanism in diverted DIII-D plasma edge

Seo, Janghoon; Choe, W.; Chang, C. S.; Ku, S.; Kwon, J. M.; Müller, Stefan H.

doi:10.1063/1.4894242

Intrinsic momentum generation by a combined neoclassical and turbulence mechanism in diverted DIII-D plasma edge

Journal Article · Mon Sep 15 04:00:00 EDT 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4894242· OSTI ID:22303632

Seo, Janghoon; Choe, W. ^[1]; Chang, C. S.; Ku, S. ^[2]; Kwon, J. M. ^[3]; Müller, Stefan H. ^[4]

Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of)
Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
National Fusion Research institute, Daejeon 305-806 (Korea, Republic of)
Max Planck Institute for Plasma Physics, Garching 85748 (Germany)

Fluid Reynolds stress from turbulence has usually been considered to be responsible for the anomalous toroidal momentum transport in tokamak plasma. Experiment by Müller et al. [Phys. Rev. Lett. 106, 115001 (2011)], however, reported that neither the observed edge rotation profile nor the inward momentum transport phenomenon at the edge region of an H-mode plasma could be explained by the fluid Reynolds stress measured with reciprocating Langmuir-probe. The full-function gyrokinetic code XGC1 is used to explain, for the first time, Müller et al.'s experimental observations. It is discovered that, unlike in the plasma core, the fluid Reynolds stress from turbulence is not sufficient for momentum transport physics in plasma edge. The “turbulent neoclassical” physics arising from the interaction between kinetic neoclassical orbit dynamics and plasma turbulence is key in the tokamak edge region across the plasma pedestal into core.

OSTI ID:: 22303632

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 21; ISSN PHPAEN; ISSN 1070-664X

Country of Publication:: United States

Language:: English

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