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Physics of Plasmas : Mechanisms and scalings of energetic ion transport via tokamak microturbulence

By T. Hauff and F. Jenko

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Book Id: WPLBN0002169638
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 13 November 2008

Title: Physics of Plasmas : Mechanisms and scalings of energetic ion transport via tokamak microturbulence  
Author: T. Hauff and F. Jenko
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Physics of Plasmas Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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And F. Jenk, T. H. (n.d.). Physics of Plasmas : Mechanisms and scalings of energetic ion transport via tokamak microturbulence. Retrieved from http://worldjournal.org/


Description
Description: The turbulent E×B advection of energetic ions in three-dimensional tokamak geometry is investigated both analytically and numerically. It is shown that orbit averaging (leading to a significant reduction of the diffusivity) is only valid for low magnetic shear. At moderate or high magnetic shear, a rather slow decrease of the diffusivity is found, proportional to (E/Te)−1 or (E/Te)−1.5 for particles with a large or small parallel velocity component, respectively. The decorrelation mechanisms responsible for this behavior are studied and explained in detail. Moreover, it is found that resonances between the toroidal drift of the particles and the diamagnetic drift of the turbulence can lead to an enhancement of the fast ion transportThe turbulent E×B advection of energetic ions in three-dimensional tokamak geometry is investigated both analytically and numerically. It is shown that orbit averaging (leading to a significant reduction of the diffusivity) is only valid for low magnetic shear. At moderate or high magnetic shear, a rather slow decrease of the diffusivity is found, proportional to (E/Te)−1 or (E/Te)−1.5 for particles with a large or small parallel velocity component, respectively. The decorrelation mechanisms responsible for this behavior are studied and explained in detail. Moreover, it is found that resonances between the toroidal drift of the particles and the diamagnetic drift of the turbulence can lead to an enhancement of the fast ion transport.

 
 


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