Study of the current-sheath formation during the implosion of multishell gas puffs

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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)228-238
Number of pages11
JournalPlasma Physics Reports
Issue number3
Publication statusPublished - 1 Mar 2008
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

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