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Jet Formation and Current Transfer in X -Pinches

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6 Author(s)
Beg, F.N. ; Blackett Lab., Imperial Coll., London ; Ciardi, A. ; Ross, I. ; Zhu, Y.
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Observations of X-pinch discharges driven by a 160-kA 80-ns pulse current are reported. X-pinches consisting of aluminum and molybdenum mounted at different angles (120deg and 83deg) were studied. Coronal-plasma streaming, which is perpendicular to the wires toward the midplane of the X-pinch, was observed to form jets moving toward the electrodes on the either side of the cross point. The jet velocity (2.5times106 cmmiddots-1) is similar for both molybdenum and aluminum wires and is slightly larger for the narrow angle (83deg). The jets were observed to show kink (m=1 mode) instability at late times, after the jets had come into contact with the electrodes. This is due to a transfer of current to the jet. The experimental results agree qualitatively with three-dimensional resistive MHD simulations, which include radiation. The jets produced in X-pinches may be relevant to the study of astrophysical jets

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Plasma Science, IEEE Transactions on  (Volume:34 ,  Issue: 5 )