Interferometric measurements of the plasma density at the Z-pinch periphery in the angara-5-1 facility |
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Authors: | V V Aleksandrov G S Volkov E V Grabovskii G G Zukakishvili M V Zurin K N Mitrofanov S L Nedoseev G M Oleinik I Yu Porofeev A A Samokhin P V Sasorov V P Smirnov I N Frolov |
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Institution: | (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, 117218, Russia |
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Abstract: | Knowledge of spatial mass distribution is important for understanding the physics of implosion of megaampere-current wire arrays. The paper presents results from studying the electron density distribution at the periphery of a tungsten wire array near the instant of maximum compression by using laser interferometry at λ=0.69 µm. It is found that, at the instant of maximum compression (~100 ns after the beginning of the discharge), the estimated maximum local electron density inside the wire array reaches ~1018 cm?3 at a distance of 0.3–3 mm from the initial wire positions. Assuming the average tungsten ion charge to be 10, the local linear mass density in this region turns out to be 3 µg/cm, which amounts to about 10% of the total linear mass density of the liner. A fraction of the generator current flows through this plasma. The duration of the soft X-ray pulse is 5–8 ns, which indicates the achievement of a fairly high compression ratio. |
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