High density γ-ray emission and dense positron production via multi-laser driven circular target

Yajuan HOU (侯雅娟); Baisong XIE (谢柏松); Chong LV (吕冲); Feng WAN (弯峰); Li WANG (王莉); Nureli YASEN; Haibo SANG (桑海波); Guoxing XIA (夏国兴)

doi:10.1088/2058-6272/ab1602

Plasma Science and Technology > 2019 > 21(8): 85201-085201. > DOI: 10.1088/2058-6272/ab1602

Yajuan HOU (侯雅娟), Baisong XIE (谢柏松), Chong LV (吕冲), Feng WAN (弯峰), Li WANG (王莉), Nureli YASEN, Haibo SANG (桑海波), Guoxing XIA (夏国兴). High density γ-ray emission and dense positron production via multi-laser driven circular target[J]. Plasma Science and Technology, 2019, 21(8): 85201-085201. DOI: 10.1088/2058-6272/ab1602

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High density γ-ray emission and dense positron production via multi-laser driven circular target

¹ Key Laboratory of Beam Technology of the Ministry of Education, and College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, People’s Republic of China
² Beijing Radiation Center, Beijing 100875, People’s Republic of China
³ School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
⁴ The Cockcroft Institute, Warrington, WA4 4AD, United Kingdom

Funds: This work was supported by the National Natural Science Foundation of China (Nos. 11875007, 11305010).

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Received Date: December 05, 2018
Revised Date: April 03, 2019
Accepted Date: April 03, 2019

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Abstract

Abstract

A diamond-like carbon circular target is proposed to improve γ-ray emission and pair production with a laser intensity of 8×10²² Wcm⁻² by using 2D particle-in-cell simulations with quantum electrodynamics. It is found that the circular target can enhance the density of γ-photons significantly more than a plane target, when two colliding circularly polarized lasers irradiate the target. By multi-laser irradiating the circular target, the optical trap of lasers can prevent the high energy electrons accelerated by laser radiation pressure from escaping. Hence, γ-photons with a high density of beyond 5000n_c are obtained through nonlinear Compton backscattering. Meanwhile, 2.7×10¹¹ positrons with an average energy of 230 MeV are achieved via the multiphoton Breit–Wheeler process. Such an ultrabright γ-ray source and dense positron source can be useful in many applications. The optimal target radius and laser mismatching deviation parameters are also discussed in detail.
- e⁺e^- pairs production,
- γ-ray emission,
- Breit-Wheeler (BW) process,
- Compton backscattering (NCBS) process,
- particle-in-cell(PIC)

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