Fast Advection of Magnetic Fields by Hot Electrons

Willingale, L. and Thomas, A. G. R. and Nilson, P. M. and Kaluza, M. C. and Bandyopadhyay, S. and Dangor, A. E. and Evans, R. G. and Fernandes, P. and Haines, M. G. and Kamperidis, C. and Kingham, R. J. and Minardi, S. and Notley, M. and Ridgers, C. P. and Rozmus, W. and Sherlock, M. and Tatarakis, M. and Wei, M. S. and Najmudin, Z. and Krushelnick, K. (2010) Fast Advection of Magnetic Fields by Hot Electrons. Physical review letters, 105 (9). ISSN 0031-9007

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Experiments where a laser-generated proton beam is used to probe the megagauss strength self-generated magnetic fields from a nanosecond laser interaction with an aluminum target are presented. At intensities of 1015 Wcm(-2) and under conditions of significant fast electron production and strong heat fluxes, the electron mean-free-path is long compared with the temperature gradient scale length and hence nonlocal transport is important for the dynamics of the magnetic field in the plasma. The hot electron flux transports self-generated magnetic fields away from the focal region through the Nernst effect [A. Nishiguchi et al., Phys. Rev. Lett. 53, 262 (1984)] at significantly higher velocities than the fluid velocity. Two-dimensional implicit Vlasov-Fokker-Planck modeling shows that the Nernst effect allows advection and self-generation transports magnetic fields at significantly faster than the ion fluid velocity, v(N)/C(s) approximate to 10.

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Journal Article
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Physical review letters
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08 Oct 2016 23:06
Last Modified:
18 Sep 2023 01:01