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LULI2000 - Collisionless magnetized shock formation and particle energization in scaled astrophysical conditions (E. d'Humières)

This project aims at studying the physics of collisionless magnetized shocks under astrophysically relevant conditions. Collisionless shocks, which are held responsible for generating nonthermal particles and radiation in high-­‐energy astrophysical objects, are widely believed to originate from micro-­‐instabilities triggered in colliding flows. Recently, rapid theoretical developments have gone hand in hand with experimental efforts to generate collisionless shocks using powerful lasers. In contrast to current works limited to unmagnetized plasma collision or collisions with low plasma magnetization, we wish to exploit recent advances in high amplitude stable magnetic field generation to study fast plasma collisions in large volume strong external magnetic fields with high magnetization relevant to supernova remnants shocks studies. We thus propose to investigate the collective interaction between two low-­‐density plasma plumes generated by LULI2000 pulses in the magnetic field generated by a magnetic pulser. This magnetic field is created on a microsecond timescale and will therefore act as a static external field which can be compressed in the plasma collision. The dynamics of the magnetic field compression and dislocation into magnetic vortices will be diagnosed via optical diagnostics, while the electron heating in the turbulent zone will be assessed from particle energy and X emission spectra. The presence of an external magnetic field is expected to lead to the development of a collisionless magnetized shock. The external magnetic field will be perpendicular to the plasma plumes collision axis allowing to use the magnetic field compression to accelerate the density increase in the collision zone and affect the shock formation process.

 

LULI2000 - S29-S31/2019