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Free keywords:
Physics, Accelerator Physics, physics.acc-ph,High Energy Physics - Experiment, hep-ex
Abstract:
The generation of ultra-relativistic positron beams with short duration
($\tau_{e^+} \leq 30$ fs), small divergence ($\theta_{e^+} \simeq 3$ mrad), and
high density ($n_{e^+} \simeq 10^{14} - 10^{15}$ cm$^{-3}$) from a fully
optical setup is reported. The detected positron beam propagates with a
high-density electron beam and $\gamma$-rays of similar spectral shape and peak
energy, thus closely resembling the structure of an astrophysical leptonic jet.
It is envisaged that this experimental evidence, besides the intrinsic
relevance to laser-driven particle acceleration, may open the pathway for the
small-scale study of astrophysical leptonic jets in the laboratory.
