Transport of ultraintense laser-driven relativistic electrons in dielectric targets

被引：2

作者：

X.H.Yang ^{[1
,2
,3
]}

C.Ren ^{[2
]}

H.Xu ^{[4
,3
]}

Y.Y.Ma ^{[1
,3
,5
]}

F.Q.Shao ^{[1
]}

机构：

[1] Department of Physics, National University of Defense Technology

[2] Department of Mechanical Engineering, University of Rochester

[3] IFSA Collaborative Innovation Center, Shanghai Jiao Tong University

[4] College of Computing Science, National University of Defense Technology

[5] State Key Laboratory of NBC Protection for Civilian

来源：

High Power Laser Science and Engineering | 2020年 / 8卷 / 01期

基金：

中国国家自然科学基金;

关键词：

ionization wave; relativistic electrons; transport; ultraintense laser;

D O I：

暂无

中图分类号：

O412.1 [相对论]; O572.322 [];

学科分类号：

070201 ; 070202 ;

摘要：

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 × 10;W/cm;that produce high relativistic electron current densities.

引用

页码：11 / 19

页数：9

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