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

Zhu, Xing-Long and Chen, Min and Yu, Tong-Pu and Weng, Su-Ming and He, Feng and Sheng, Zheng-Ming (2019) Collimated GeV attosecond electron-positron bunches from a plasma channel driven by 10 PW lasers. Matter and Radiation at Extremes, 4 (1). 014401. ISSN 2468-080X

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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.