中国物理B ›› 2021, Vol. 30 ›› Issue (11): 115202-115202.doi: 10.1088/1674-1056/abfb59

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

Aynisa Tursun(阿依妮萨·图尔荪)1, Mamat Ali Bake(买买提艾力·巴克)1,†, Baisong Xie(谢柏松)2,‡, Yasheng Niyazi(亚生·尼亚孜)3, and Abuduresuli Abudurexiti(阿不都热苏力·阿不都热西提)1   

  1. 1 School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China;
    2 Key Laboratory of Beam Technology of the Ministry of Education, and College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;
    3 Institute of Physics and Electrical Engineering, Kashi University, Kashgar 844009, China
  • 收稿日期:2021-01-17 修回日期:2021-04-20 接受日期:2021-04-26 出版日期:2021-10-13 发布日期:2021-10-27
  • 通讯作者: Mamat Ali Bake, Baisong Xie E-mail:mabake@xju.edu.cn;bsxie@bnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11664039, 11875007, and 11664040).

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

Aynisa Tursun(阿依妮萨·图尔荪)1, Mamat Ali Bake(买买提艾力·巴克)1,†, Baisong Xie(谢柏松)2,‡, Yasheng Niyazi(亚生·尼亚孜)3, and Abuduresuli Abudurexiti(阿不都热苏力·阿不都热西提)1   

  1. 1 School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China;
    2 Key Laboratory of Beam Technology of the Ministry of Education, and College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;
    3 Institute of Physics and Electrical Engineering, Kashi University, Kashgar 844009, China
  • Received:2021-01-17 Revised:2021-04-20 Accepted:2021-04-26 Online:2021-10-13 Published:2021-10-27
  • Contact: Mamat Ali Bake, Baisong Xie E-mail:mabake@xju.edu.cn;bsxie@bnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11664039, 11875007, and 11664040).

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摘要： 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 nc. 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.

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

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 nc. 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.

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

中图分类号:  (Laser-plasma interactions)

  • 52.38.-r
52.38.Ph (X-ray, γ-ray, and particle generation) 52.65.-y (Plasma simulation)