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Abstract

A global nonlinear simulation code for the time evolution of ion-temperature-gradient-driven modes in theta-pinch geometry as a first approximation to the stellarator Wendelstein 7-X (W7-X) [Grieger et al., Proceedings of the 13th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Washington, DC, 1990 (International Atomic Energy Agency, Vienna, 1991), Vol. 3, p. 525] has been developed. A delta f particle-in-cell (PIC) method is used to solve the coupled system of gyrokinetic equations for the ions, in the electrostatic approximation, and the quasi-neutrality equation, assuming adiabatically responding electrons. The focus has been on adherence to conservation laws, i.e., particle number and energy conservation. Besides other improvements it has been shown that a well-chosen initial distribution of the markers in reduced phase space makes optimal use of the delta f PIC method to reduce the statistical noise for a given number of markers. In a model including all (1351) physically relevant modes, it has been possible to achieve energy conservation beyond the saturation of the instability.

The full text of this article is available online from the 'Physics of Plasmas' website at: http://www.pppl.gov/physplas/

Additional information

Authors: HATZKY R, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Greifswald (DE);KÖNIES A, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Greifswald (DE);KLEIBER R, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Greifswald (DE);TRAN T M, Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, École Polytechnique Fédérale de Lausanne (CH);ALLFREY S J, Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, École Polytechnique Fédérale de Lausanne (CH);KONIES A, Max-Planck-Institut fur Plasmaphysik, EURATOM Association, Greifswald (DE)
Bibliographic Reference: An article published in: Physics of Plasmas, Volume 9, Issue 3, March 2002, pp. 898-912
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