Stellarator turbulence at electron gyroradius scales

Jenko, F.; Kendl, A.

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Stellarator turbulence at electron gyroradius scales

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Jenko, F.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

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Kendl, A.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

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Jenko, F., & Kendl, A. (2002). Stellarator turbulence at electron gyroradius scales. New Journal of Physics, 4: 35. Retrieved from http://www.iop.org/EJ/abstract/1367-2630/4/1/335.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-41DB-7

Abstract

Electromagnetic gyrokinetic simulations of electron- temperature-gradient-driven modes on electron gyroradius scales are performed in the geometry of an advanced stellarator fusion experiment, Wendelstein 7-AS. Based on linear simulations, a critical electron- temperature-gradient formula is established which happens to agree quite well with a previously derived formula for tokamaks in the appropriate limit. Nonlinear simulations are used to study the turbulence and transport characteristics which are dominated by the presence of high- amplitude radially elongated vortices or 'streamers'. The role of Debye shielding effects is also examined.