Effects of resistive magnetic instability and electron refluxing on fast electron dynamics and bremsstrahlung radiation characteristics in relativistic laser-solid interaction
Effects of resistive magnetic instability and electron refluxing on fast electron dynamics and bremsstrahlung radiation characteristics in relativistic laser-solid interaction
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电阻磁不稳定性和电子回流对相对论激光-固体相互作用中快速电子动力学和轫致辐射特性的影响
DOI：
10.1088/1361-6587/ab3473
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发表时间：
2019-08
影响因子：
2.2
通讯作者：
Zhao Yongtao
中科院分区：
文献类型：
--
作者：
Ren Jieru;Wu Dong;Hoffmann Dieter H. H.;Wang Dahui;Zhao Yongtao
用新开发的粒子模拟程序研究了强激光与固体相互作用引起的快电子输运和韧致辐射。该PIC程序能够模拟强激光-固体相互作用，考虑了许多耦合的物理过程，如激光-等离子体相互作用，电离动力学，碰撞动力学，电子输运和光子发射。靶效应可以根据其固有的原子性质来区分。在这项工作中，铝，铜，和金目标具有不同的厚度被认为是。结果表明，在1020 W cm−2的固定激光强度下，韧致辐射的角分布显著依赖于靶材料和靶厚度。对于低Z材料，电子和发射的光子倾向于沿激光传播方向沿着准直。对于高Z材料，角分布较宽，这归因于自生电阻磁场诱导的电子动量发散。此外，模拟结果表明，对于Al靶，总的发射能量随着靶厚度的减小而增加，这是因为电子轰击引起了相当大的后向发射。相比之下，对于Au靶，由于后向发射在一定程度上被掩埋在较宽的分布中，因此，电子束对总发射能量的影响可以忽略。
Fast electron transport as well as bremsstrahlung emissions induced by relativistic intense laser solid interactions are investigated with a newly developed particle-in-cell (PIC) simulation code. This PIC code is capable of simulating intense laser-solid interactions by taking into account many coupled physical processes, like laser-plasma interaction, ionization dynamics, collisional dynamics, electron transport and photon emission. The target effects can be distinguished according to their intrinsic atomic properties. In this work, aluminium, copper, and gold targets with different thickness are considered. It is shown that with the fixed laser intensity of 1020 W cm−2, the angular distribution of bremsstrahlung emission, significantly depends on target material and target thickness. For low Z material, the electrons and the emitted photons tend to be collimated along the laser propagation direction. For high Z material, the angular distribution is broader, which is attributed to the self-generated resistive magnetic field-induced electron momentum divergence. Moreover, the simulation result shows that for Al target, the total emission energy increases with decreasing target thickness, because electron refluxing induces considerable backward emission. Comparatively, for Au target, the electron refluxing effect on the total emission energy can be ignored, because the backward emission is somewhat buried within the broad distribution.
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强激光与高 Z 固体相互作用产生的 X/伽马射线辐射的特征：轫致辐射和辐射反应的作用
影响因子：
5.1
作者：
Wu D.;Yu W.;Zhao Y. T.;Fritzsche S.;He X. T.
通讯作者：
He X. T.
DOI：
10.1103/physreve.95.023207
发表时间：
2016-07
期刊：
Physical review. E
影响因子：
--
作者：
D. Wu;Xiangqun He;W. Yu;S. Fritzsche
通讯作者：
D. Wu;Xiangqun He;W. Yu;S. Fritzsche
影响因子：
2.2
作者：
C. Courtois;R. Edwards;A. C. L. Fontaine;C. Aedy;S. Bazzoli;J. Bourgade;J. Gazave;J. Lagrange
通讯作者：
C. Courtois;R. Edwards;A. C. L. Fontaine;C. Aedy;S. Bazzoli;J. Bourgade;J. Gazave;J. Lagrange
影响因子：
2.4
作者：
Davies, JR;Bell, AR;Guerin, SM
通讯作者：
Guerin, SM
影响因子：
2.2
作者：
F. Ewald;H. Schwoerer;S. Düsterer;R. Sauerbrey;J. Magill;J. Galy;R. Schenkel;S. Karsch;D. Habs;K. Witte
通讯作者：
F. Ewald;H. Schwoerer;S. Düsterer;R. Sauerbrey;J. Magill;J. Galy;R. Schenkel;S. Karsch;D. Habs;K. Witte