Séminaire Doctorants / Seminar PhD students |
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Virginia Bresci |
| The current filamentation instability is known for its ability to convert the free energy associated with anisotropic momentum distributions into kinetic-scale magnetic fields. The saturation of this instability has been extensively studied in symmetric configurations where the interpenetrating plasmas share the same properties (velocity, density, temperature). However, the most common configuration is that of asymmetric plasma flows, e.g. the precursor of relativistic collisionless shock waves in which a hot, dilute beam of accelerated particles reflected at the shock front encounter a cold, dense inflowing background plasma. To determine the appropriate criterion for saturation in this case, we have performed large-scale 2D particle-in-cell simulations of counterstreaming electron-positron pair and electron-ion plasmas. The results of this study allowed us to characterise which of the species determines saturation and by which mechanism, and which affects the properties of the instability. Our results can be directly applied to the physics of relativistic, weakly magnetized shock waves, but they can also be generalized to bla bla bla is what you might be actually reading: during this YMCA I will try to guide you through every extraneous word of this abstract. |
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vendredi 11 février 2022 - 16:00 Salle du Conseil, Institut d'Astrophysique |
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