Study of axial plasma flows in the PF-4 plasma focus-type setup

Abstract

The results of the study of axial plasma flows generated in a plasma focus-type setup are presented. The study is performed using laser probing and plasma diagnosing techniques based on image converter means. The dependences of the parameters of axial plasma flows on the electrode shape, gas pressure in a discharge chamber, and gas type are found. The optimum setup operating conditions are determined.

Experimental Study of the Mechanism Erosion Materials Exposed to Low Plasma Power Flows

“…As is well-known plasma focus devices are sources of high energy ions [6], electrons, x-rays and neutrons [7][8] and intense bursts of fast plasma streams. The experimental work irradiation of specimens was carried out using PF-4 device which cylindrical coaxial electrodes: anode and cathode (length of anode and cathode 33 mm and 38 mm respectively) [2,4]. The insulator used is a 31 mm long ceramic.…”

“…One of the most important tasks of plasma physics [1] is to study the resistance of materials of the first wall, the divertor and other nodes of the thermonuclear reactor to stationary plasma-thermal effects with a capacity of up to 20 mW/m 2 and intense pulsed duration of 0.1-10 ms and a power of 1-10 GW/m 2 [1][2][3]. Many of the basic problems investigated and solved but one of the main problems still not enough investigated is connected with material science and radiation nuclear physics [1][2][3][4][5][6][7][8][9][10][11][12]. They are long lasting irradiation and heat loads that are generated in the fusion devices affect the construction materials and appearance different of defects on the surface materials.…”

“…Macroscopic erosion, characterized by lower specific energy values, is more dangerous than evaporation and sputtering [4][5][6]. In the case of all metals, including austenitic steels resulting from plasma exposure lead to the formation of cracks, deterioration of thermal conductivity, and the release of particles of matter into the vacuum chamber [7].…”