Transport turbulent d'impuretés dans un plasma magnétisé

Abstract : The turbulent impurity transport is an essential issue for the achievement of magnetically confined fusion. Indeed, a build-up of impurities in the plasma core induces radiation energy losses. On the other hand, it is foreseen to inject impurities at the plasma edge in order to extract heat by radiation. These conditions impose control and therefore understanding of impurity transport. An analytical expression for the turbulent flux of impurities for a given turbulent spectrum have been derived using a quasilinear theory applied to a drift-wave turbulence. The nature and characteristics of the main accumulation (or pinch) mechanisms for impurities have been identified. A new version of the fluid turbulence code TRB has been developed. This version allows simulating the transport of impurities in electronic and ionic drift-wave turbulence. Zero-flux simulations, corresponding to a stationnary plasma whose impurity source is limited to the plasma edge, confirmed the presence of an impurity pinch.Quasilinear predictions have been numerically confirmed, and the relative importance of the various pinch mechanisms has been studied. The dominant role of curvature pinch has been shown. Finally, simulations have been compared to experimental measurements made on JET and Tore Supra tokamaks. The presence of a turbulent pinch of impurities has been confirmed, as well as the independence of transport on impurity charge.
Complete list of metadatas

Cited literature [48 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01748150
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 11:26:36 AM
Last modification on : Monday, April 16, 2018 - 10:42:15 AM
Long-term archiving on : Friday, September 14, 2018 - 9:12:37 AM

File

SCD_T_2006_0253_DUBUIT.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01748150, version 1

Collections

Citation

Nicolas Dubuit. Transport turbulent d'impuretés dans un plasma magnétisé. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10253⟩. ⟨tel-01748150⟩

Share

Metrics

Record views

10

Files downloads

63