Study of the current-sheath formation during the implosion of multishell gas puffs |
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Authors: | A. Yu. Labetsky V. A. Kokshenev N. E. Kurmaev V. I. Oreshkin A. G. Rousskikh A. V. Fedyunin F. I. Fursov S. A. Chaikovsky A. V. Shishlov N. A. Zhidkova |
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Affiliation: | (1) Institute of High Current Electronics, Siberian Branch, Russian Academy of Sciences, Akademichesky pr. 2/3, Tomsk, 634055, Russia |
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Abstract: | Results are presented from experimental studies of the dynamics of large-diameter multishell gas puffs imploded by microsecond megampere current pulses. The experiments were conducted on the GIT-12 generator in the regime of microsecond implosion (t imp = 1.1–1.2 μs, I 0 = 3.4–3.7 MA). The influence of the load configuration on the dynamics of current losses and gas-puff radiative characteristics was studied. The correlation between the radial compression ratio (the ratio between the initial and final Z-pinch radii) and the magnitude of the current flowing at the plasma periphery was investigated. The experiments show that, in a multishell gas puff, large-scale instabilities insignificantly affect the gas-puff implosion even over microsecond time intervals and that a compact dense pinch with a relatively high average electron temperature (400–600 eV) forms at the Z-pinch axis. The diameter of the plasma column radiating in the K-shell lines of neon is about 3–4 mm, the K-shell radiation yield being 5–11 kJ/cm. In the final stage of implosion, only a small portion of the current flows through the high-temperature central region of the pinch plasma, whereas the major part of the generator current flows through the residual peripheral plasma. |
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