Ultrabright γ-ray emission from the interaction of an intense laser pulse with a near-critical-density plasma

doi:10.1088/1674-1056/abfb59

Abstract An efficient scheme for generating ultrabright γ-rays from the interaction of an intense laser pulse with a near-critical-density plasma is studied by using the two-dimensional particle-in-cell simulation including quantum electrodynamic effects. We investigate the effects of target shape on γ-ray generation efficiency using three configurations of the solid foils attached behind the near-critical-density plasma: a flat foil without a channel (target 1), a flat foil with a channel (target 2), and a convex foil with a channel (target 3). When an intense laser propagates in a near-critical-density plasma, a large number of electrons are trapped and accelerated to GeV energy, and emit γ-rays via nonlinear betatron oscillation in the first stage. In the second stage, the accelerated electrons collide with the laser pulse reflected from the foil and emit high-energy, high-density γ-rays via nonlinear Compton scattering. The simulation results show that compared with the other two targets, target 3 affords better focusing of the laser field and electrons, which decreases the divergence angle of γ-photons. Consequently, denser and brighter γ-rays are emitted when target 3 is used. Specifically, a dense γ-ray pulse with a peak brightness of 4.6×10²⁶ photons/s/mm²/mrad²/0.1%BW (at 100 MeV) and 1.8×10²³ photons/s/mm²/mrad²/0.1%BW (at 2 GeV) are obtained at a laser intensity of 8.5×10²² W/cm² when the plasma density is equal to the critical plasma density n_c. In addition, for target 3, the effects of plasma channel length, foil curvature radius, laser polarization, and laser intensity on the γ-ray emission are discussed, and optimal values based on a series of simulations are proposed.

Keywords: electron acceleration γ-ray emission inverse Compton scattering near-critical-density plasma 2D-QED-PIC simulation

Received: 17 January 2021
Revised: 20 April 2021
Accepted manuscript online: 26 April 2021

PACS:	52.38.-r	(Laser-plasma interactions)
	52.38.Ph	(X-ray, γ-ray, and particle generation)
	52.65.-y	(Plasma simulation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11664039, 11875007, and 11664040).

Corresponding Authors: Mamat Ali Bake, Baisong Xie
E-mail: mabake@xju.edu.cn;bsxie@bnu.edu.cn

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Aynisa Tursun(阿依妮萨·图尔荪), Mamat Ali Bake(买买提艾力·巴克), Baisong Xie(谢柏松), Yasheng Niyazi(亚生·尼亚孜), and Abuduresuli Abudurexiti(阿不都热苏力·阿不都热西提) Ultrabright γ-ray emission from the interaction of an intense laser pulse with a near-critical-density plasma 2021 Chin. Phys. B 30 115202

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Ultrabright γ-ray emission from the interaction of an intense laser pulse with a near-critical-density plasma

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