Scaled laboratory experiments explain the kink behaviour of the Crab Nebula jet.
Scaled laboratory experiments explain the kink behaviour of the Crab Nebula jet.
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DOI:
10.1038/ncomms13081
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发表时间:
2016-10-07
影响因子:
16.6
通讯作者:
Woolsey, N. C.
中科院分区:
文献类型:
--
作者:
Li, C. K.;Tzeferacos, P.;Lamb, D.;Gregori, G.;Norreys, P. A.;Rosenberg, M. J.;Follett, R. K.;Froula, D. H.;Koenig, M.;Seguin, F. H.;Frenje, J. A.;Rinderknecht, H. G.;Sio, H.;Zylstra, A. B.;Petrasso, R. D.;Amendt, P. A.;Park, H. S.;Remington, B. A.;Ryutov, D. D.;Wilks, S. C.;Betti, R.;Frank, A.;Hu, S. X.;Sangster, T. C.;Hartigan, P.;Drake, R. P.;Kuranz, C. C.;Lebedev, S. V.;Woolsey, N. C.
The remarkable discovery by the Chandra X-ray observatory that the Crab nebula's jet periodically changes direction provides a challenge to our understanding of astrophysical jet dynamics. It has been suggested that this phenomenon may be the consequence of magnetic fields and magnetohydrodynamic instabilities, but experimental demonstration in a controlled laboratory environment has remained elusive. Here we report experiments that use high-power lasers to create a plasma jet that can be directly compared with the Crab jet through well-defined physical scaling laws. The jet generates its own embedded toroidal magnetic fields; as it moves, plasma instabilities result in multiple deflections of the propagation direction, mimicking the kink behaviour of the Crab jet. The experiment is modelled with three-dimensional numerical simulations that show exactly how the instability develops and results in changes of direction of the jet. The periodical change of the Crab nebula's jet direction challenges our understanding of astrophysical jet dynamics. Here the authors use high-power lasers to create a jet that can be directly compared to the Crab nebula's, and report the detection of plasma instabilities that mimic kink behaviour.
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影响因子:
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通讯作者:
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