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Study of the impurity composition and effective plasma charge in the GOL-3 facility

  • Magnetic Confinement Systems
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Abstract

Heating and confinement of plasma in a multimirror magnetic configuration have been studied at the GOL-3 facility (Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk). The experiments are aimed at estimating the densities and charge states of the main impurities in the GOL-3 plasma and determining their contribution to the effective plasma charge. Plasma with a density of ∼1015 cm−3 was heated by a relativistic electron beam (1 MeV, 8 μs, ⩽200 kJ). At the end of electron beam injection, the plasma temperature reached 1 keV. The densities of impurities were determined using VUV and visible spectroscopy, as well as mass spectrometry of the residual vacuum. To determine the effective plasma charge, the experimental data were compared with the results of numerical simulations of the ionization balance of impurities. It is shown that the effective plasma charge calculated with allowance for the contributions from the main impurities does not exceed Z eff = 1.8, which cannot explain the experimentally observed improved confinement of low-density plasma.

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Authors and Affiliations

  1. Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 11, Novosibirsk, 630090, Russia

    N. V. Sorokina, A. V. Burdakov, I. A. Ivanov, S. V. Polosatkin, V. V. Postupaev, A. F. Rovenskikh & A. A. Shoshin

  2. Novosibirsk State Technical University, pr. Karla Marksa 20, Novosibirsk, 630073, Russia

    N. V. Sorokina, A. V. Burdakov & S. V. Polosatkin

  3. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia

    I. A. Ivanov, S. V. Polosatkin, V. V. Postupaev & A. A. Shoshin

Authors
  1. N. V. Sorokina
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  2. A. V. Burdakov
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  3. I. A. Ivanov
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  4. S. V. Polosatkin
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  5. V. V. Postupaev
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  6. A. F. Rovenskikh
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  7. A. A. Shoshin
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Corresponding author

Correspondence to N. V. Sorokina.

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Original Russian Text © N.V. Sorokina, A.V. Burdakov, I.A. Ivanov, S.V. Polosatkin, V.V. Postupaev, A.F. Rovenskikh, A.A. Shoshin, 2015, published in Fizika Plazmy, 2015, Vol. 41, No. 7, pp. 573–579.

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Sorokina, N.V., Burdakov, A.V., Ivanov, I.A. et al. Study of the impurity composition and effective plasma charge in the GOL-3 facility. Plasma Phys. Rep. 41, 529–534 (2015). https://doi.org/10.1134/S1063780X15070077

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  • DOI: https://doi.org/10.1134/S1063780X15070077

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