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Fast advection of magnetic fields by hot electrons. 2010
L Willingale, and
A G R Thomas, and
P M Nilson, and
M C Kaluza, and
S Bandyopadhyay, and
A E Dangor, and
R G Evans, and
P Fernandes, and
M G Haines, and
C Kamperidis, and
R J Kingham, and
S Minardi, and
M Notley, and
C P Ridgers, and
W Rozmus, and
M Sherlock, and
M Tatarakis, and
M S Wei, and
Z Najmudin, and
K Krushelnick
Blackett Laboratory, Imperial College London, London, SW7 2BZ, United Kingdom.
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 10(15) W cm(-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, 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)≈10.
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