Turbulence Mechanisms of Enhanced Performance Stellarator Plasmas

Xanthopoulos, P.; Bozhenkov, S.A.; Beurskens, M.N.; Smith, H.M.; Plunk, G.G.; Helnader, P.; Beidler, C.D.; Alcusón, J.A.; Alonso, A.; Dinklage, A.; Ford, O.; Fuchert, G.; Geiger, J.; Proll, J.H.E.; Pueschel, M.J.; Turkin, Y.; Warmer, F.

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Author

Xanthopoulos, P.

Bozhenkov, S.A.

Beurskens, M.N.

Smith, H.M.

Plunk, G.G.

Helnader, P.

Beidler, C.D.

Alcusón, J.A.

Alonso, A.

Dinklage, A.

Ford, O.

Fuchert, G.

Geiger, J.

Proll, J.H.E.

Pueschel, M.J.

Turkin, Y.

Warmer, F.

Publisher

American Physical Society

Date

2020

Subject

Turbulence, stellarators & toroidal confinement devices, Gyrofluid & gyrokinetics

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.

URI

http://hdl.handle.net/10396/30803

Fuente

P. Xanthopoulos et al. Phys. Rev. Lett. 125, 075001

Versión del Editor

https://doi.org/10.1103/PhysRevLett.125.075001