X-ray backlighting of two-wire Z-pinch plasma using X-pinch |
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Authors: | Zhao Tong Zou Xiao-Bing Zhang Ran and Wang Xin-Xin |
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Institution: | State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China |
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Abstract: | Two 50-μm Mo wires in parallel used as a Z-pinch load are electrically exploded with a pulsed current rising to 275 kA in 125 ns and their explosion processes are backlighted using an X-pinch as an x-ray source. The backlighting images show clearly the processes similar to those occurring in the initial stages of a cylindrical wire-array Z-pinch, including the electric explosion of single wires characterised by the dense wire cores surrounded by a low-density coronal plasma, the expansion of the exploding wire, the sausage instability (m=0) in the coronal plasma around each wire, the motion of the coronal plasma as well as the wire core toward the current centroid, the formation of the precursor plasma column with a twist structure something like that of higher mode instability, especially the kink instability (m=1). |
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Keywords: | X-pinch Z-pinch x-ray backlighting |
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