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Development of the technology of using a vacuum arc discharge system for the formation of the metallic gas puff is going in two directions.
The first direction is the use of a plasma jet for the X-ray radiography. We have compared the spatial dimensions of the radiating hot spot based on the use of X-pinch and Point Z-pinch (PZ-pinch is a regular Z-pinch with a small initial size (diameter of about 1 mm and the height is 1.3 mm)). Comparison showed that in the radiation range below 3 keV, the spatial dimensions had almost the same characteristics. A clear advantage of PZ-pinch over X-pinch is multiple using of high-current generator load without a disassembly. This report presents the latest data on the distribution of the linear mass of metallic gas puff obtained by X-ray radiography, based on X-pinch and PZ-pinch.
Second direction is the use of a vacuum arc discharge system to form a metallic gas-puff pinch. The report presents the results of the use of the jet metallic gas-puff pinch and the shell-on-jet metallic gas-puff pinch. Experiments were carried out on the IMRI-5 (450 kA, 450 ns) and MIG (2.1 MA, 100 ns) high-current generators. It was shown that Raleigh-Taylor instabilities are suppressed almost completely at the implosion of Z-pinch with power-law density profile [1]. In fact, the plasma boundary is stable during the run-in-phase of implosion. The instabilities with m=0 and m=1 appear only in the stagnation phase [2,3].
[1] A.L. Velikovich, F.L. Cochran, and J. Davis, Phys. Rev. Lett. 77, 853 (1996).
[2] A.G. Rousskikh, A.S. Zhigalin, V.I. Oreshkin, et al, Phys. of Plasmas, 21, 052701 (2014).
[3] A.G. Rousskikh, A.S. Zhigalin, V.I. Oreshkin, et al, Phys. of Plasmas 23, iss.6, 063502 (2016).
Work supported by the grant Russian Scientific Foundation # 16-19-10142.
