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  • IF =1.193

  • ISSN 1009-0630

  • e-ISSN 2058-6272

  • CN 34-1187/TL

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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), et al.
Plasma Sci. Technol.    2019, 21(8): 085201; doi: 10.1088/2058-6272/ab1602
Abstract56)      PDF (2056KB)(41)      
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 5000nc 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.
Enhancement of proton collimation and acceleration by an ultra-intense laser interacting with a cone target followed by a beam collimator
Nureli YASEN 1, Yajuan HOU (侯雅娟) 1, Li WANG (王莉) 1, et al.
Plasma Sci. Technol.    2019, 21(4): 045201; doi: 10.1088/2058-6272/aaf7cf
Abstract26)      PDF (1090KB)(56)      

A special method is proposed of a laser-induced cavity pressure acceleration scheme for collimating, accelerating and guiding protons, using a single-cone target with a beam collimator through a target normal sheath acceleration mechanism. In addition, the problems involved are studied by using two-dimensional particle-in-cell simulations. The results show that the proton beam can be collimated, accelerated and guided effectively through this type of target. Theoretically, a formula is derived for the combined electric field of accelerating protons. Compared with a proton beam without a beam collimator, the proton beam density and cut-off energy of protons in the type II are increased by 3.3 times and 10% respectively. Detailed analysis shows that the enhancement is mainly due to the compact and strong sheath electrostatic field, and that the beam collimator plays a role in focusing energy. In addition, the simulation results show that the divergence angle of the proton beam in type II is less than 1.67 times that of type I. The more prominent point is that the proton number of type II is 2.2 times higher than that of type I. This kind of target has important applications in many fields, such as fast ion ignition in inertial fusion, high energy physics and proton therapy.

Fast electrons collimating and focusing by an ultraintense laser interacting with a high density layers
Nureli YASEN 1, Chong LV (吕冲) 1, Yajuan HOU (侯雅娟) 1, et al.
Plasma Sci. Technol.    2018, 20(12): 125201; doi: 10.1088/2058-6272/aaccf2
Abstract24)      PDF (1187KB)(105)      

The use of a novel double-cone funnel target with high density layers (HDL) to collimate and focus electrons is investigated by two-dimensional particle-in-cell simulations. The proposed scheme can guide, collimate and focus electron beams to smaller sizes. The collimation reasons are analyzed by the quasi-static magnetic fields generation inside the beam collimator with HDL. It is found that the energy conversion efficiency is increased by a factor of 2.2 in this new scheme in comparison with the that without HDL. Such a target structure has potential for design flexibility and prevents inefficiencies in important applications such as fast ignition, etc.

Simulation of electromagnetic pulses generated by escaped electrons in a high- power laser chamber
Hanbing JIN (金晗冰) 1,2, Cui MENG (孟萃) 1,2, Yunsheng JIANG (姜云升) 1,2, et al.
Plasma Sci. Technol.    2018, 20(11): 115201; doi: 10.1088/2058-6272/aac838
Abstract41)      PDF (1451KB)(166)      

Intensive electromagnetic pulses (EMPs) can be generated when a high-power laser strikes a target. The transient electromagnetic field can have an intensity of up to several hundred kV m -1 with a broad frequency of up to several gigahertz, which may affect diagnostics and interfere with, or even damage, electronic equipment. In this paper, the process in which hot electrons produced by the laser-target interaction radiate EMPs is studied and simulated. The physical process is divided into three stages which are: the production of hot electrons; the escape of hot electrons; and the generation of EMPs. Instead of using a general finite difference time domain (FDTD) method to solve the Maxwell equations, a particle-in-cell method together with a time- biased FDTD method is applied in EMP simulation to restrain high-frequency noise. The results show that EMPs are stronger with higher laser intensity and larger target size.

Enhanced photon emission and pair production in laser-irradiated plasmas
Feng WAN (弯峰)1, Chong LV (吕冲)1, Moran JIA (贾默然)1 and Baisong XIE (谢柏松)1,2
Plasma Sci. Technol.    2017, 19(7): 075201; doi: 10.1088/2058-6272/aa64ed