Correlation length scalings in fusion edge plasma turbulence computations
Stefan J. Konzett, Dirk Reiser, Alexander Kendl
TL;DR
This paper investigates how various plasma parameters affect fluctuation correlation lengths in fusion edge turbulence, revealing that strong shear flows induce long-range correlations in electrostatic potential fluctuations.
Contribution
It provides a detailed analysis of the impact of density gradient, collisionality, plasma beta, and shear flow on correlation lengths using drift-Alfven turbulence computations.
Findings
Strong shear flows induce long-range correlations.
Correlation lengths depend on plasma parameters.
Shear flow significantly alters turbulence structure.
Abstract
The effect of changes in plasma parameters, that are characteristic near or at an L-H transition in fusion edge plasmas, on fluctuation correlation lengths are analysed by means of drift-Alfven turbulence computations. Scalings by density gradient length, collisionality, plasma beta, and by an imposed shear flow are considered. It is found that strongly sheared flows lead to the appearence of long-range correlations in electrostatic potential fluctuations parallel and perpendicular to the magnetic field.
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