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The Influence of Stochastic Layers of Magnetic Field Lines on Transport Barrier Formation in a Stellarator System

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Czechoslovak Journal of Physics Aims and scope

Abstract

The results of local measurements of RF discharge plasma parameters in the process of internal transport barriers (ITB) formation in the vicinity of rational magnetic surfaces in the Uragan-3M torsatron are presented. The following phenomena were observed in the process of ITB formation: widening of the radial density distribution, formation of plateaus on radial density and electron temperature distributions, formation of regions with high shear of poloidal plasma rotation velocity and radial electric field in the vicinity of stochastic layers of magnetic field lines, decrease of density fluctuations and their radial correlation length, decorrelation of density fluctuations, and increase of the bootstrap current.

After the ITB formation, the transition to the improved plasma confinement regime takes place. The transition moves to the beginning of the discharge with the increase of heating power. The possible mechanism of ITB formation near rational surfaces is discussed.

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Authors and Affiliations

  1. Institute of Plasma Physics, National Science Center “Kharkov Institute of Physics and Technology”, Kharkov, 61108, Ukraine

    E.D. Volkov, V.L. Berezhnyi, V.N. Bondarenko, V.V. Chechkin, I.P. Fomin, L.I. Grigor'eva, V.G. Konovalov, A.E. Kulaga, A.P. Litvinov, A.V. Lozin, Yu.K. Mironov, N.I. Nazarov, V.L. Ocheretenko, I.B. Pinos, V.S. Romanov, A.N. Shapoval, A.I. Skibenko, A.S. Slavnyi, E.L. Sorokovoi, I.K. Tarasov & S.A. Tsybenko

  2. National Technical University “Kharkov Politechnic Institute”, Kharkov, 61108, Ukraine

    T.E. Shcherbinina

Authors
  1. E.D. Volkov
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  2. V.L. Berezhnyi
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  3. V.N. Bondarenko
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  4. V.V. Chechkin
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  5. I.P. Fomin
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  6. L.I. Grigor'eva
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  7. V.G. Konovalov
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  8. A.E. Kulaga
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  9. A.P. Litvinov
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  10. A.V. Lozin
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  11. Yu.K. Mironov
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  12. N.I. Nazarov
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  13. V.L. Ocheretenko
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  14. I.B. Pinos
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  15. V.S. Romanov
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  16. A.N. Shapoval
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  17. A.I. Skibenko
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  18. A.S. Slavnyi
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  19. E.L. Sorokovoi
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  20. I.K. Tarasov
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  21. S.A. Tsybenko
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  22. T.E. Shcherbinina
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Volkov, E., Berezhnyi, V., Bondarenko, V. et al. The Influence of Stochastic Layers of Magnetic Field Lines on Transport Barrier Formation in a Stellarator System. Czechoslovak Journal of Physics 53, 887–894 (2003). https://doi.org/10.1023/A:1026340422646

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