Description
Invited speakers: A.R. Bell (Univ Oxford, UK), G Fichet de ClaireFontaine (Univ Valencia, Spain), P. Cristofari (LUX)
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Dr Pierre Cristofari (Observatoire de Paris)19/05/2026 09:25
Recent observations have opened a new window on the long-standing question of the origin of Galactic cosmic rays up to PeV energies. In particular, the LHAASO experiment has revealed a population of ultra-high-energy gamma-ray sources extending beyond 100 TeV, providing compelling evidence for Galactic pevatrons (accelerating CRs up to 10$^{15}$ eV). These results challenge the traditional...
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Prof. Tony Bell (University of Oxford)19/05/2026 11:10
Ever since the classic papers of Lagage & Cesarsky (1983) and Hillas (1984), the Bohm limit uBR has been taken as the measure of the maximum energy to which cosmic rays can be accelerated by shocks. The obvious problem in the 1980s was that the Bohm limit for supernova remnants fell well short of the knee in the spectrum at a few PeV. This problem appeared to be solved when fields of a few...
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M. Itamar Cohen (Technion Israel Institute of Technology)19/05/2026 12:10
We will present the characterization of magnetized turbulence generated in a laser-driven plasma. The work was performed at the LULI2000 laser facility (France). Starting from an homogenous magnetized plasma, produced by having a high-strength pulsed magnetic field [1] embedded in a gas jet, we randomly perturbed the gas using a speckled laser beam [2]. Using proton radiography [3], we will...
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Dr Gaëtan Fichet de Clairfontaine (University of Würzburg)19/05/2026 14:30
Jets of active galactic nuclei (AGN) rank among the most promising candidates for the sources of extragalactic high-energy neutrinos. In this presentation, I will begin by briefly building a broad picture of these jets first from recent observations, then by covering our current theoretical interpretations of their dynamics and multi-wavelength emissions, which will define a set of open...
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M. Léo Molinier (CEA)19/05/2026 16:15
Compton-driven interactions between ultraintense gamma-ray fluxes and background plasmas are expected to arise in various high-energy astrophysical settings. Self-consistent kinetic investigations into this problem are now accessible via particle-in-cell (PIC) simulations [1-3], which have recently uncovered a rich phenomenology of acceleration processes and plasma instabilities. Here, we...
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