The controllable electron-heating by external magnetic fields at relativistic laser-solid interactions in the presence of large scale pre-plasmas
The controllable electron-heating by external magnetic fields at relativistic laser-solid interactions in the presence of large scale pre-plasmas
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在存在大规模前等离子体的情况下，相对论性激光-固体相互作用中外部磁场的可控电子加热
DOI：
10.1088/1361-6587/aa69a9
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发表时间：
2016-02
影响因子：
2.2
通讯作者：
He X. T.
中科院分区：
文献类型：
--
作者：
Wu D.;Luan S. X.;Wang J. W.;Yu W.;Gong J. X.;Cao L. H.;Zheng C. Y.;He X. T.
两级电子加速/加热模型（Wu et al 2017 Nucl. Fusion 57 016007 和 Wu et al 2016 Phys. Plasmas 23 123116）被扩展到研究相对论强度和存在大规模预制等离子体的情况下的激光磁化等离子体相互作用。结果表明，电子加热效率是一个可由外部磁场控制的值。详细研究表明，对于右旋圆偏振激光器，电子加热效率取决于外部磁场的强度和方向。当外部磁场为 B ≡ ω c / ω 0 > 1 时，电子加热显着增强。当磁场为负方向时，即B < 0 时，有抑制电子加热的趋势。揭示了底层物理现象——电子加热对外部磁场强度和方向的依赖性。当 − ∞ < B < 1 时，电子加热可以通过纵向电荷分离电场和反射的“包络调制”CP 激光的协同效应来解释。结果表明，反射CP激光的“调制深度”很大程度上取决于外部磁场，进而影响电子加热的效率。当 B > 1 时，在相对论性激光磁化等离子体相互作用中发现了激光前沿锐化机制，这导致电子加热的显着增强。
The two-stage electron acceleration/heating model (Wu et al 2017 Nucl. Fusion 57 016007 and Wu et al 2016 Phys. Plasmas 23 123116) is extended to the study of laser magnetized-plasmas interactions at relativistic intensities and in the presence of large-scale preformed plasmas. It is shown that the electron-heating efficiency is a controllable value by the external magnetic fields. Detailed studies indicate that for a right-hand circularly polarized laser, the electron heating efficiency depends on both strength and directions of external magnetic fields. The electron-heating is dramatically enhanced when the external magnetic field is of B ≡ ω c / ω 0 > 1 . When magnetic field is of negative direction, i.e. B < 0 , it trends to suppress the electron heating. The underlining physics—the dependences of electron-heating on both the strength and directions of the external magnetic fields—is uncovered. With − ∞ < B < 1 , the electron-heating is explained by the synergetic effects by longitudinal charge separation electric field and the reflected ‘envelop-modulated’ CP laser. It is indicated that the ‘modulation depth’ of reflected CP laser is significantly determined by the external magnetic fields, which will in turn influence the efficiency of the electron-heating. While with B > 1 , a laser front sharpening mechanism is identified at relativistic laser magnetized-plasmas interactions, which is responsible for the dramatical enhancement of electron-heating.
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影响因子：
4
作者：
Zhuo, H. B.;Ma, Y. Y.;Shao, F. Q.;Borghesi, M.
通讯作者：
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DOI：
10.1103/physreve.95.023207
发表时间：
2016-07
期刊：
Physical review. E
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影响因子：
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影响因子：
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作者：
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影响因子：
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