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. 2020 Aug 14;125(7):075001.
doi: 10.1103/PhysRevLett.125.075001.

Turbulence Mechanisms of Enhanced Performance Stellarator Plasmas

P Xanthopoulos  1 , S A Bozhenkov  1 , M N Beurskens  1 , H M Smith  1 , G G Plunk  1 , P Helander  1 , C D Beidler  1 , J A Alcusón  1 , A Alonso  1 , A Dinklage  1 , O Ford  1 , G Fuchert  1 , J Geiger  1 , J H E Proll  2 , M J Pueschel  3 , Y Turkin  1 , F Warmer  1 , The W-X Team  1
Affiliations

Turbulence Mechanisms of Enhanced Performance Stellarator Plasmas

P Xanthopoulos et al. Phys Rev Lett. .

Abstract

We theoretically assess two mechanisms thought to be responsible for the enhanced performance observed in plasma discharges of the Wendelstein 7-X stellarator experiment fueled by pellet injection. The effects of the ambipolar radial electric field and the electron density peaking on the turbulent ion heat transport are separately evaluated using large-scale gyrokinetic simulations. The essential role of the stellarator magnetic geometry is demonstrated, by comparison with a tokamak.

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