Suppression of turbulence by trapped electrons in optimised stellarators

B.J. Faber; G.G. Plunk; H.M. Smith; J.H.E. Proll; M.J. Pueschel; P. Helander; P. Xanthopoulos; T. G\"orler

Suppression of turbulence by trapped electrons in optimised stellarators

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arxiv 2002.10484 v1 pith:E5GZJILN submitted 2020-02-24 physics.plasm-ph

J.H.E. Proll , P. Xanthopoulos , P. Helander , G.G. Plunk , B.J. Faber , T. Görler , H.M. Smith , M.J. Pueschel This is my paper

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keywords modestellaratorstrappedw7-xbenefitsconfinementconfiningcriteria

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In fusion devices, the geometry of the confining magnetic field has a significant impact on the instabilities that drive turbulent heat loss. This is especially true of stellarators, where the "trapped electron mode" (TEM) is stabilised if specific optimisation criteria are satisfied, as in the Wendelstein 7-X experiment (W7-X). Here we find, by numerical simulation, that W7-X indeed has low TEM-driven transport, and also benefits from stabilisation of the ion-temperature-gradient mode, giving theoretical support for the existence of enhanced confinement regimes at finite density gradients.

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