Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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A. A. Subbotin¹, J. Nuhrenberg², M. I. Mikhailov¹, W. A. Cooper³, M. Yu. Isaev¹, M. F. Heyn⁴, V. N. Kalyuzhnyj⁵, S. V. Kasilov⁵, W. Kernbichler⁴, V. V. Nemov⁵, V. D. Shafranov<sup>1

1</sup>Institute for Nuclear Fusion, Russian Research Centre "Kurchatov Institute", Moscow, Russia
²Max-Planck Institut für Plasmaphysik, IPP-EURATOM Association, Garching bei München, Germany
³Centre de Recherches en Physique des Plasmas, Lausanne, Switzerland
⁴Institut für Theoretische Physik, Graz, Austria
⁵Institute of Plasma Physics, National Scientific Center "Kharkov Institute of Physics and Technology", Kharkiv, Ukraine

Abstract: Collisionless particle confinement in stellarator configurations with helical direction of the lines B = const on the magnetic surfaces is investigated numerically for a six-period system. The optimisation is performed with different penalty functions that are connected with the pseudosymmetry condition and the condition that the second adiabatic invariant J_∥ forms closed contours. In addition, the effect of β on the particle confinement is studied.

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