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We report on the first experimental observation of a current-driveninstability developing in a quasi-neutral matter-antimatter beam. Strongmagnetic fields ($\geq$ 1 T) are measured, via means of a proton radiographytechnique, after the propagation of a neutral electron-positron beam through abackground electron-ion plasma.The experimentally determined equipartitionparameter of $\epsilon_B \approx 10^{-3}$, is typical of values inferred frommodels of astrophysical gamma-ray bursts, in which the relativistic flows arealso expected to be pair dominated. The data, supported by Particle-In-Cellsimulations and simple analytical estimates, indicate that these magneticfields persist in the background plasma for thousands of inverse plasmafrequencies. The existence of such long-lived magnetic fields can be related toanalog astrophysical systems, such as those prevalent in lepton-dominated jets.

Experimental observation of a current-driven instability in a neutral electron-positron beam