skip to main content

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

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.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of)
  2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
  3. National Fusion Research institute, Daejeon 305-806 (Korea, Republic of)
  4. Max Planck Institute for Plasma Physics, Garching 85748 (Germany)
  5. (United States)
Publication Date:
OSTI Identifier:
22303632
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DOUBLET-3 DEVICE; H-MODE PLASMA CONFINEMENT; LANGMUIR PROBE; NEOCLASSICAL TRANSPORT THEORY; PLASMA; REYNOLDS NUMBER; STRESSES; TURBULENCE