Development of instabilities in wire-array Z pinches |
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Authors: | Chittenden J P Jennings C A |
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Affiliation: | Blackett Laboratory, Imperial College, London, United Kingdom. |
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Abstract: | 3D resistive MHD simulations are used to show how the properties of the "fundamental" mode of modulated ablation in wire-array Z pinches, are consistent with the growth of a modified m=0-like instability. The modulation wavelength, structure, and evolution is found to be governed by the magnetic topology and is largely independent of the initial conditions. The perturbation amplitude as a function of wire number is shown to be consistent with experimental x-ray power scaling. Simulations of an array of helical wires show a substantial reduction in the amplitude of the instability. |
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