Radiographic research of the Bi plasma jet formed by the vacuum arc discharge

5th International Congress on Energy Fluxes and Radiation Effects 2016

Artyomov, A.P.^1 ; Rousskikh, A.G.^1 ; Fedunin, A.V.^1 ; Chaikovsky, S.A.^1,2 ; Zhigalin, A.S.^1 ; Oreshkin, V.I.^1

Institute of High Current Electronics SB RAS, 2/3 Akademichesky Ave., Tomsk

634033, Russia^1

Institute of Electrophysics UD RAS, 106 Amundsen St., Ekaterinburg

620016, Russia^2

关键词: Arc current density;    Current rise time;    Electrode material;    Evaporation rate;    High current vacuum arc;    Soft x-ray radiation;    Vacuum arc discharges;    X-ray backlighting;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/830/1/012038/pdf
DOI  :  10.1088/1742-6596/830/1/012038

来源: IOP

【 摘 要 】

The results of experiments on a soft x-ray radiography (≈ 1-2 keV) of a bismuth plasma formed by the high-current vacuum arc discharge are represented. The plasma gun with the arc current ≈ 60 kA and the current rise time ≈ 7 μs was used to produce the Bi plasma jet. The compact pulsed radiograph XPG-1 (250 kA, 220 ns) with an X-pinch load consisting of four Mo wires with a diameter 25 μm was used as a source of the soft X-ray radiation. The X-ray backlighting images of the researched plasma jet and the Bi step-wedge with a step thickness of ≈ 100 nm were recorded simultaneously in the course of the experiment. A comparison of the plasma jet x-ray image with the current trace has enabled to estimate dependencies of the linear mass on the arc current. The experiments have shown that when the arc current density reaches ≈ 3•105A/cm2, the evaporation rate of the electrode material reaches ≈ 100 μg/μs, that under the plasma velocity ≈ 0.5 cm/μs, provides a plasma jet linear mass ≈ 200 μg/cm. At a distance of ≈ 1-2 mm from the arc cathode surface, the sharp increase of the jet linear mass (up to ≈ 500 μg/cm) occurred.