Simulating Astrophysical Jets in Laboratory Experiments |
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Authors: | Paul M Bellan Setthivoine You Scott C Hsu |
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Institution: | (1) Caltech 128-95, Pasadena, CA 91125, USA;(2) LANL, USA |
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Abstract: | Pulsed-power technology and appropriate boundary conditions have been used to create simulations of magnetically driven astrophysical
jets in a laboratory experiment. The experiments are quite reproducible and involve a distinct sequence. Eight initial flux
tubes, corresponding to eight gas injection locations, merge to form the jet, which lengthens, collimates, and eventually
kinks. A model developed to explain the collimation process predicts that collimation is intimately related to convection
and pile-up of frozen-in toroidal flux convected with the jet. The pile-up occurs when there is an axial non-uniformity in
the jet velocity so that in the frame of the jet there appears to be a converging flow of plasma carrying frozen-in toroidal
magnetic flux. The pile-up of convected flux at this “stagnation region” amplifies the toroidal magnetic field and increases
the pinch force, thereby collimating the jet. |
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Keywords: | astrophysical jet collimation kink MHD pinch stagnation |
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