5th International Congress on Energy Fluxes and Radiation Effects 2016 | |
Radiographic research of the Bi plasma jet formed by the vacuum arc discharge | |
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.
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
Radiographic research of the Bi plasma jet formed by the vacuum arc discharge | 418KB | download |