Numerical study of jets produced by conical wire arrays on the Magpie pulsed power generator |
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Authors: | M Bocchi J P Chittenden A Ciardi F Suzuki-Vidal G N Hall P de Grouchy S V Lebedev S C Bott |
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Affiliation: | 1.The Blackett Laboratory,Imperial College London,London,UK;2.LERMA, Observatoire de Paris,Université Pierre et Marie Curie,Meudon,France;3.UMR 8112 CNRS,école Normale Supérieure,Paris,France;4.Center for Energy Research,University of California,San Diego,USA |
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Abstract: | The aim of this work is to model the jets produced by conical wire arrays on the MAGPIE generator, and to design and test
new setups to strengthen the link between laboratory and astrophysical jets. We performed the modelling with direct three-dimensional
magneto-hydro-dynamic numerical simulations using the code GORGON. We applied our code to the typical MAGPIE setup and we
successfully reproduced the experiments. We found that a minimum resolution of ∼100 μm is required to retrieve the unstable
character of the jet. We investigated the effect of changing the number of wires and found that arrays with less wires produce
more unstable jets, and that this effect has magnetic origin. Finally, we studied the behaviour of the conical array together
with a conical shield on top of it to reduce the presence of unwanted low density plasma flows. The resulting jet is shorter
and less dense. |
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