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Title: Turbulent energy exchange: Calculation and relevance for profile prediction

The anomalous heat production due to turbulence is neither routinely calculated in nonlinear gyrokinetic simulations nor routinely retained in profile prediction studies. In this work, we develop a symmetrized method to compute the exchange which dramatically reduces the intermittency in the time-dependent moment, thereby improving the accuracy of the time-average. We also examine the practical impact on transport-timescale simulations, and show that the exchange has only a minor impact on profile evolution for a well-studied DIII-D discharge.
Authors:
 [1]
  1. General Atomics, San Diego, California 92186 (United States)
Publication Date:
OSTI Identifier:
22227905
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 8; Other Information: (c) 2013 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; ELECTRIC DISCHARGES; ENERGY TRANSFER; HEAT PRODUCTION; NONLINEAR PROBLEMS; PLASMA; PLASMA RADIAL PROFILES; PLASMA SIMULATION; TIME DEPENDENCE; TURBULENCE