Impurity Transport in a Mixed-Collisionality Stellarator Plasma

Helander, P.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (författare)

A potential threat to the performance of magnetically confined fusion plasmas is the problem of impurity accumulation, which causes the concentration of highly charged impurity ions to rise uncontrollably in the center of the plasma and spoil the energy confinement by excessive radiation. It has long been thought that the collisional transport of impurities in stellarators always leads to such an accumulation (if the electric field points inwards, which is usually the case), whereas tokamaks, being axisymmetric, can benefit from "temperature screening," i.e., an outward flux of impurities driven by the temperature gradient. Here it is shown, using analytical techniques supported by results from a new numerical code, that such screening can arise in stellarator plasmas, too, and indeed does so in one of the most relevant operating regimes, where the impurities are highly collisional while the bulk plasma is at low collisionality.

Newton, Sarah,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)sarahn (författare)
Mollén, Albert,1985Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)(Swepub:cth)albertm (författare)
Smith, Håkan,1976Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)(Swepub:cth)elfhs (författare)
Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG)Chalmers tekniska högskola (creator_code:org_t)

Av författaren/redakt...: Helander, P.; Newton, Sarah, 1 ...; Mollén, Albert, ...; Smith, Håkan, 19 ...

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