Erlangen 2022 – scientific programme

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 7: Laser-Beam Matter Interaction - Laser Applications II

K 7.4: Talk

Thursday, March 17, 2022, 14:45–15:00, K-H4

Laboratory evidence for proton energization by collisionless shock surfing — •Alice Fazzini¹, Weipeng Yao^1,2, Sophia Chen³, Konstantin Burdonov^1,2, Patrizio Antici³, Jérôme Béard³, Simon Bolanos¹, Andrea Ciardi², Raymond Diab¹, Stanimir Kisyov³, Vincent Lelasseux¹, Marco Miceli³, Salvatore Orlando³, Sergey Pikuz³, Evgeny Filippov³, Dragos Popescu³, Viorel Nastasa³, Quentin Moreno³, Guilhem Revet¹, Emmanuel d'Humières³, Xavier Ribeyre³, and Julien Fuchs¹ — ¹LULI - CNRS, CEA, Ecole Polytechnique - F-91128 Palaiseau, France — ²Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005, Paris, France — ³Refer to J. Fuchs for the complete list of addresses

Collisionless shocks are present in many astrophysical phenomena, such as supernovae remnants and the Earth's bow shock. In these events, collisionless electromagnetic processes mediate the transfer of momentum and energy from the flowing plasma to the ambient one. Using our platform, where we couple high-power lasers (JLF/Titan at LLNL, and LULI2000) with strong magnetic fields, we have generated astrophysically relevant super-critical magnetized collisionless shocks. Kinetic Particle-In-Cell simulations based on our experimental results reveal that shock surfing acceleration is responsible for the energization of the background protons up to 100 keV. Our observations not only provide evidence of early stage ion acceleration by collisionless shocks, but they also highlight the role this mechanism plays in energizing ions initially at rest, with capacity to feed further stages of acceleration.