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Transport of ultraintense laser-driven relativistic electrons in dielectric targets

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Abstract

Ultraintense laser-driven relativistic electrons provide a way of heating matter to high energy density states related to many applications. However, the transport of relativistic electrons in solid targets has not been understood well yet, especially in dielectric targets. We present the first detailed two-dimensional particle-in-cell simulations of relativistic electron transport in a silicon target by including the field ionization and collisional ionization processes. An ionization wave is found propagating in the insulator, with a velocity dependent on laser intensity and slower than the relativistic electron velocity. Widely spread electric fields in front of the sheath fields are observed due to the collective effect of free electrons and ions. The electric fields are much weaker than the threshold electric field of field ionization. Two-stream instability behind the ionization front arises for the cases with laser intensity greater than $5\times 10^{19}~\text{W}/\text{cm}^{2}$ that produce high relativistic electron current densities.

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DOI:10.1017/hpl.2019.53

所属栏目:Research Articles

基金项目:This work was supported by the National Natural Science Foundation of China (Nos. 11775305, 11675264 and 11705282), Science Challenge Project (No. TZ2018001) and Open Fund of the State Key Laboratory of High Field Laser Physics (SIOM). X. H. Yang also acknowledges the support from the China Scholarship Council.

收稿日期:2019-07-02

录用日期:2019-11-21

网络出版日期:2020-02-19

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X. H. Yang:Department of Physics, National University of Defense Technology, Changsha410073, ChinaDepartment of Mechanical Engineering, University of Rochester, Rochester, New York14627, USAIFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai200240, China
C. Ren:Department of Mechanical Engineering, University of Rochester, Rochester, New York14627, USA
H. Xu:College of Computing Science, National University of Defense Technology, Changsha410073, ChinaIFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai200240, China
Y. Y. Ma:Department of Physics, National University of Defense Technology, Changsha410073, ChinaIFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai200240, ChinaState Key Laboratory of NBC Protection for Civilian, Beijing102205, China
F. Q. Shao:Department of Physics, National University of Defense Technology, Changsha410073, China

联系人作者:X. H. Yang(xhyang@nudt.edu.cn)

备注:This work was supported by the National Natural Science Foundation of China (Nos. 11775305, 11675264 and 11705282), Science Challenge Project (No. TZ2018001) and Open Fund of the State Key Laboratory of High Field Laser Physics (SIOM). X. H. Yang also acknowledges the support from the China Scholarship Council.

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引用该论文

X. H. Yang, C. Ren, H. Xu, Y. Y. Ma, and F. Q. Shao, "Transport of ultraintense laser-driven relativistic electrons in dielectric targets," High Power Laser Science and Engineering 8(1), e2 (2020)

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