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• Received: Jul. 30, 2018

Accepted: Oct. 28, 2018

Posted: Dec. 31, 2019

Published Online: Mar. 25, 2019

The Author Email: Sheng Zheng-Ming (zmsheng@sjtu.edu.cn)

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Xing-Long Zhu, Min Chen, Tong-Pu Yu, Su-Ming Weng, Feng He, Zheng-Ming Sheng. Collimated GeV attosecond electron–positron bunches from a plasma channel driven by 10 PW lasers[J]. Matter and Radiation at Extremes, 2019, 4(1): 014401

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## Abstract

High-energy positrons and bright γ-ray sources are of great importance both in fundamental research and for practical applications. However, collimated GeV electron–positron pair jets and γ-ray flashes are still rarely produced in the laboratory. Here, we demonstrate that by irradiating a near-critical-density plasma channel with two 10 PW-scale laser pulses, highly directional GeV electron–positron pairs and bright γ-ray beams can be efficiently generated. Three-dimensional particle-in-cell simulations show the formation of GeV positron jets with high density ($8×1021/ cm3$), attosecond duration (400 as), and a divergence angle of 14°. Additionally, ultrabright $[2×1025 photons s?1 mm?2 mrad?2 (0.1% bandwidth)?1]$ collimated attosecond (370 as) γ-ray flashes with a laser energy conversion efficiency of 5.6% are emitted. These features show the significant advantage of using a plasma channel as compared with a uniform plasma and thus open up new possibilities for a wide variety of applications.