Experimental and numerical studies of plasma production in the initial stage of implosion of a cylindrical wire array |
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Authors: | V. V. Aleksandrov A. G. Alekseev V. N. Amosov M. M. Basko G. S. Volkov E. V. Grabovskii A. V. Krasil’nikov G. M. Oleinik I. N. Rastyagaev P. V. Sasorov A. A. Samokhin V. P. Smirnov I. N. Frolov |
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Affiliation: | (1) Troitsk Institute for Innovation and Fusion Research, Troitsk, Moscow oblast, 142190, Russia;(2) Institute of Theoretical and Experimental Physics, Bol’shaya Cheremushkinskaya ul. 25, Moscow, 117259, Russia |
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Abstract: | The features are studied of plasma production in the initial stage of implosion of hollow cylindrical wire arrays at electric-field growth rates of 1012 V/(cm s). The results are presented from the analysis of both UV emission from the wire plasma and the discharge parameters in the initial stage of the formation of a Z-pinch discharge. It is found that, a few nanoseconds after applying voltage to a tungsten wire array, a plasma shell arises on the wire surface and the array becomes a heterogeneous system consisting of metal wire cores and a plasma surrounding each wire (a plasma corona). As a result, the current switches from the wires to the plasma. A further heating and ionization of the wire material are due primarily to heat transfer from the plasma corona. A model describing the primary breakdown along the wires is created with allowance for the presence of low-Z impurities on the wire surface. |
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