Study of Plasma Flows Generated in Plasma Focus Discharge in Different Regimes of Working Gas Filling
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MA DYNAMICS
Study of Plasma Flows Generated in Plasma Focus Discharge in Different Regimes of Working Gas Filling D. A. Voitenkoa, S. S. Ananyevb, G. I. Astapenkoa, A. D. Basilaiaa, A. I. Markoliaa, K. N. Mitrofanovc, V. V. Myaltonb, A. P. Timoshenkoa, A. M. Kharrasovb, and V. I. Krauzb, * a State
Unitary Enterprise Sukhum Physical Technical Institute, Sukhum, 384914 Abkhazia b National Research Center Kurchatov Institute, Moscow, 123182 Russia c Troitsk Institute for Innovation and Fusion Research, Troitsk, Moscow, 142190 Russia *e-mail: [email protected] Received April 14, 2017; in final form, May 18, 2017
Abstract—Results are presented from experimental studies of the plasma flows generated in the KPF-4 Phoenix Mather-type plasma focus device (Sukhum Physical Technical Institute). In order to study how the formation and dynamics of the plasma flow depend on the initial distribution of the working gas, a system of pulsed gas puffing into the discharge volume was developed. The system allows one to create profiled gas distributions, including those with a reduced gas density in the region of plasma flow propagation. Results of measurements of the magnetic field, flow profile, and flow deceleration dynamics at different initial distributions of the gas pressure are presented. DOI: 10.1134/S1063780X17120066
1. INTRODUCTION Plasma focus (PF) devices are widely known as sources of high-power plasma flows. Such flows have received application in various fields of science and technology. In particular, they are used to study the processes of plasma−surface interaction [1, 2], modify the properties of construction materials, and create nanocoatings [3–6]. A promising application of these flows is laboratory modeling of various phenomena occurring in the Universe. Thus, plasma flows generated in the PF-3 device at the Kurchatov Institute (Moscow, Russia) were used to model the interaction of solar wind with the Earth’s magnetosphere [7, 8]. Providing certain scalings, it is possible to model many astrophysical processes under laboratory conditions by using plasma devices [9, 10]. In particular, the existing experimental facilities allow one to successfully model such a phenomenon as astrophysical jets [11]. Significant achievements were obtained in experiments carried out at high-power laser facilities [12] and Z-pinches [13–17]. Plasma flows generated in PF devices can also be efficiently used to model astrophysical jets, in particular, jet ejections from young stellar objects [18, 19]. It was shown in [20] that the parameters of axial plasma flows depend on the shape of the electrode. In [21–24], laser optical methods were applied to study the dynamics of plasma flow formation in different gases. In [25], plasma jet formation in the anode region of a small-scale PF device was observed in the late stage of the discharge. In the PF-
3 device, high-speed photographing was used to study the formation of the pinch, which served as a source of the axial plasma flow. A combination of several streak cameras oriented in diffe
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