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Article overview
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High-energy acceleration phenomena in extreme radiation-plasma interactions | | J. C. Faure
; D. Tordeux
; L. Gremillet
; M. Lemoine
; | | Date: |
1 Sep 2023 | | Abstract: | We simulate, using a particle-in-cell code, the chain of acceleration
processes at work during the Compton-based interaction of a dilute electron-ion
plasma with an extreme-intensity, incoherent gamma-ray flux with a photon
density several orders of magnitude above the particle density. The plasma
electrons are initially accelerated in the radiative flux direction through
Compton scattering. In turn, the charge-separation field from the induced
current drives forward the plasma ions to near-relativistic speed and
accelerates backwards the non-scattered electrons to energies easily exceeding
those of the driving photons. The dynamics of those energized electrons is
determined by the interplay of electrostatic acceleration, bulk plasma motion,
inverse Compton scattering and deflections off the mobile magnetic fluctuations
generated by a Weibel-type instability. The latter Fermi-like effect notably
gives rise to a forward-directed suprathermal electron tail. We provide simple
analytical descriptions for most of those phenomena and examine numerically
their sensitivity to the parameters of the problem. | | Source: | arXiv, 2309.00366 | | Services: | Forum | Review | PDF | Favorites | |
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