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High-energy positrons and bright {\gamma}-ray sources are unique both forfundamental research and practical applications. However, GeV electron-positronpair jets and {\gamma}-ray flashes are still hardly produced in laboratories.Here we demonstrate that, by irradiating two 10 PW-scale laser pulses onto anear-critical density plasma channel, highly-directional GeV electron-positronpairs and bright {\gamma}-ray beams can be efficiently generated.Three-dimensional particle-in-cell simulations show that GeV positron jets showhigh density (8*10^21/cm^3), attosecond duration (400 as) and a divergenceangle of 14{\deg}. Additionally, ultrabright (2*10^25photons/s/mm2/mrad2/0.1%BW) collimated attosecond (370 as) {\gamma}-ray flasheswith a laser energy conversion efficiency of 5.6% are emitted. Once realized inexperiment, it may open up new possibilities for a wide variety ofapplications.

Collimated GeV attosecond electron-positron bunches from a plasma channel driven by 10 PW lasers