In this section
@article{Lebedev:2000,
author = {Lebedev, SV and Chittenden, JP and Bland, SN and Beg, FN and Dangor, AE and Haines, MG and Pikuz, SA and Shelkovenko, TA},
journal = {IEEE International Conference on Plasma Science},
title = {Plasma formation and seeding of Rayleigh-Taylor instabilities in wire array z-pinches},
year = {2000}
}
TY - JOUR
AB - X-ray radiography with high temporal (approximately lns) and spatial (approximately 20 μm) resolution was used to study implosion dynamics of wire array Z-pinch in experiments on the 1.4 MA, 240 ns MAGPIE facility. Comparison of laser probing and x-ray radiography data shows that the plasma formed from the wires has a heterogeneous structure, with a low density corona surrounding the dense wire cores. Non-uniform sweeping of the coronal plasma by the global J×B force from the wires towards the array axis produces both mass perturbations in the wire cores and a precursor column on the axis. The spatial scale of these perturbations, which act as seeding for the global m = 0 mode of the Rayleigh-Taylor instability, is determined by the size of wire cores (0.25 mm for Al and 0.1 mm for W). A qualitative change in the implosion dynamics (transition to 0-D-like implosion trajectory) was observed in Al arrays when the ratio of inter-wire gap to the wire core size decreased to approximately 3. This probably explains the existence of `critical' inter-wire gap, below which a significant rise in x-ray power was observed in experiments at Sandia National Lab. Experimental data on `nested' wire array implosions will be presented, which show significant sharpening of the X-ray pulse in different dynamic modes of the interaction between the two arrays.
AU - Lebedev,SV
AU - Chittenden,JP
AU - Bland,SN
AU - Beg,FN
AU - Dangor,AE
AU - Haines,MG
AU - Pikuz,SA
AU - Shelkovenko,TA
PY - 2000///
SN - 0730-9244
TI - Plasma formation and seeding of Rayleigh-Taylor instabilities in wire array z-pinches
T2 - IEEE International Conference on Plasma Science
ER -
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