Towards the generation of collisionless electron-positron shocks in the laboratory: Ultrafast thermalisation of laser-driven relativistic plasma jets - INSU - Institut national des sciences de l'Univers Access content directly
Conference Papers Year : 2014

Towards the generation of collisionless electron-positron shocks in the laboratory: Ultrafast thermalisation of laser-driven relativistic plasma jets

Mickael Grech
  • Function : Author
Mathieu Lobet
  • Function : Author
Charles Ruyer
  • Function : Author
Emmanuel d'Humières
  • Function : Author
Martin Lemoine
Laurent Gremillet
  • Function : Author

Abstract

Weibel-mediated collisionless shocks between high-velocity, counter-streaming (electron-ion or electron-positron) plasma flows have been extensively investigated over the past years to gain understanding of various extreme astrophysical scenarii. Here, we examine a concept of colliding pair plasmas that exploits the extreme electromagnetic fields envisioned on compressed LMJ-class laser projects. We present the first self-consistent numerical study, using QED-PIC simulations, of the creation (through the multi-photon Breit-Wheeler process) and subsequent interaction of two counter-streaming, relativistic pair flows driven from laser-irradiated thin Al foils. Fast-growing Weibel instabilities are found to induce ultra-fast thermalisation of the pair jets through the buildup of a MT magnetostatic barrier. The associated gamma-ray generation, its effect on electron-positron thermalisation, as well as the subsequent shock formation are analysed in detail.
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Dates and versions

insu-03645308 , version 1 (19-04-2022)

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Mickael Grech, Mathieu Lobet, Charles Ruyer, Emmanuel d'Humières, Martin Lemoine, et al.. Towards the generation of collisionless electron-positron shocks in the laboratory: Ultrafast thermalisation of laser-driven relativistic plasma jets. APS Division of Plasma Physics Meeting 2014, 2014, à renseigner, Unknown Region. ⟨insu-03645308⟩
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