First laboratory observation of anisotropic proton emission in the vicinity of laser-produced cosmic-ray sources
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The anisotropic propagation of cosmic rays (CRs) in the vicinity of their sources has been experimentally investigated in laboratory via deuterium-deuterium fusion reactions in laser-produced colliding plasma jets. Distinctly different angular distributions of neutrons and protons demonstrate the existence of well-ordered magnetic fields in the vicinity of the plasma-jet collision region. A quantitative correlation between the magnetic-field properties and the anisotropic proton distribution is established through proton trajectory tracing, yielding an inferred path-integrated magnetic field of 360 T∙mm, initialized with seed magnetic fields obtained from hydrodynamic simulations. These findings offer new perspective on the transport and origin of CRs, providing an experimental framework for studying the anisotropic CRs near astrophysical sources.
