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Compression dynamics of quasi-spherical wire arrays with different linear mass profiles

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Abstract

Results of experimental studies of the implosion of quasi-spherical wire (or metalized fiber) arrays are presented. The goal of the experiments was to achieve synchronous three-dimensional compression of the plasma produced in different regions of a quasi-spherical array into its geometrical center. To search for optimal synchronization conditions, quasi-spherical arrays with different initial profiles of the linear mass were used. The following dependences of the linear mass on the poloidal angle were used: m l (θ) ∝ sin–1θ and m l (θ) ∝ sin–2θ. The compression dynamics of such arrays was compared with that of quasi-spherical arrays without linear mass profiling, m l (θ) = const. To verify the experimental data, the spatiotemporal dynamics of plasma compression in quasi-spherical arrays was studied using various diagnostics. The experiments on three-dimensional implosion of quasi-spherical arrays made it possible to study how the frozen-in magnetic field of the discharge current penetrates into the array. By measuring the magnetic field in the plasma of a quasi-spherical array, information is obtained on the processes of plasma production and formation of plasma flows from the wire/fiber regions with and without an additionally deposited mass. It is found that penetration of the magnetic flux depends on the initial linear mass profile m l (θ) of the quasi-spherical array. From space-resolved spectral measurements and frame imaging of plasma X-ray emission, information is obtained on the dimensions and shape of the X-ray source formed during the implosion of a quasi-spherical array. The intensity of this source is estimated and compared with that of the Z-pinch formed during the implosion of a cylindrical array.

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Authors and Affiliations

  1. Troitsk Institute for Innovation and Thermonuclear Research, Troitsk, Moscow, 142190, Russia

    K. N. Mitrofanov, V. V. Aleksandrov, A. N. Gritsuk, E. V. Grabovski, I. N. Frolov, Ya. N. Laukhin & G. M. Oleinik

  2. Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Miusskaya pl. 4, Moscow, 125047, Russia

    O. G. Ol’khovskaya

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  1. K. N. Mitrofanov
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  2. V. V. Aleksandrov
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  3. A. N. Gritsuk
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  4. E. V. Grabovski
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  5. I. N. Frolov
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  6. Ya. N. Laukhin
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  7. G. M. Oleinik
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  8. O. G. Ol’khovskaya
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Correspondence to K. N. Mitrofanov.

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Original Russian Text © K.N. Mitrofanov, V.V. Aleksandrov, A.N. Gritsuk, E.V. Grabovski, I.N. Frolov, Ya.N. Laukhin, G.M. Oleinik, O.G. Ol’khovskaya, 2016, published in Fizika Plazmy, 2016, Vol. 42, No. 9, pp. 813–840.

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Mitrofanov, K.N., Aleksandrov, V.V., Gritsuk, A.N. et al. Compression dynamics of quasi-spherical wire arrays with different linear mass profiles. Plasma Phys. Rep. 42, 834–858 (2016). https://doi.org/10.1134/S1063780X16090063

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