飞秒激光与固体靶相互作用的前向快电子束发散研究

doi:10.16568/j.0254-6086.201803004

核聚变与等离子体物理 ›› 2018, Vol. 2 ›› Issue (3): 269-274.DOI: 10.16568/j.0254-6086.201803004

飞秒激光与固体靶相互作用的前向快电子束发散研究

蔡达锋1，王剑1，谷渝秋2，郑志坚2

(1. 内江师范学院物理与电子信息工程学院，内江 641112；2. 中国工程物理研究院激光聚变研究中心，绵阳 621900)

收稿日期:2017-08-21 修回日期:2018-04-05 出版日期:2018-09-15 发布日期:2018-09-14
作者简介:蔡达锋(1963-)，男，四川金堂人，博士，教授，主要研究领域为超短超强激光-等离子体相互作用。
基金资助:
国家自然科学基金(10975121)；四川省教育厅科研项目(10ZA012)

A study for the divergence of forward fast-electron-beam produced by a femtosecond laser pulse on a solid target

CAI Da-feng, WANG Jian, GU Yu-qiu, ZHENG Zhi-jian

(1. School of Physics and Electronic Information Engineering, Neijiang Normal University, Neijiang 641112; 2. Research Center of Laser Fusion, CAEP, Mianyang 621900)

Received:2017-08-21 Revised:2018-04-05 Online:2018-09-15 Published:2018-09-14

摘要/Abstract

摘要：

为了研究前向快电子束的发散问题，采用飞秒激光辐照平面铜靶，以电子角分布仪和氟化锂(LiF)热释光探测器探测快电子的前向发散角。实验显示前向快电子束发散角均在95°(半高宽FWHM)以上。理论计算指出预等离子体中电子的初速度以及加速后的电子在靶内碰撞效应均不是产生大发散角的重要原因。根据激光-等离子体相互作用理论，等离子体中的电磁场才是导致前向快电子束产生较大发散角的主要原因。这个研究为获取较小发散角的前向快电子束提供了实验设置的依据。

关键词: 飞秒激光, 铜膜靶, 前向快电子, 发散角

Abstract:

In order to investigate the divergence of forward fast-electron-beam, the divergence angle of fast-electron-beam produced in the interaction of femtosecond laser with Cu target has been measured by using an angular distribution instrument adding the lithium fluoride (LiF) thermo-luminescent dosimeters. The results show that the divergence angle of forward fast-electron-beam is above 95° (Full width at half maximum, FWHM) level. The theoretic calculation show that the muzzle velocity of electrons from pre-plasma and the collision effect generated by the transmission of fast electrons through a target are not mostly factor. A larger divergence angle of the forward fast-electron-beam is attributed to the electromagnetic field. This investigation is helpful to select the laser and the target parameter for getting a fast electron beam with small divergence angle.

Key words: Femtosecond laser, Cu target, Forward fast-electron-beam, Divergence angle

中图分类号:

O434.12

蔡达锋1，王剑1，谷渝秋2，郑志坚2. 飞秒激光与固体靶相互作用的前向快电子束发散研究[J]. 核聚变与等离子体物理, 2018, 2(3): 269-274.

CAI Da-feng, WANG Jian, GU Yu-qiu, ZHENG Zhi-jian. A study for the divergence of forward fast-electron-beam produced by a femtosecond laser pulse on a solid target[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2018, 2(3): 269-274.

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飞秒激光与固体靶相互作用的前向快电子束发散研究

A study for the divergence of forward fast-electron-beam produced by a femtosecond laser pulse on a solid target

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参考文献

[7] Reich Ch, Uschmann I, Ewald F, et al. Spatial characteristics of K_α X-ray emission from relativistic femtosecond laser plasmas[J]. Phys. Rev. E, 2003, 68(5): 056408.

[13] Akli K U, Storm M J, McMakon M, et al. Time dependence of fast electron beam divergence in ultraintense laser-plasma interactions[J]. Phys. Rev. E, 2012, 86(2): 026404.

[14] Vaziri Mohammad, Golshani Mojtaba, Sohaily Sozha, et al. Electron acceleration by linearly polarized twisted laser pulse with narrow divergence [J]. Phys. Plasmas, 2015, 22(3): 033118.

[15] Culfa O, Tallents G J, Rossall A K, et al. Plasma scale-length effects on electron energy spectra in high-irradiance laser plasmas[J]. Phys. Rev. E, 2016, 93 (4): 043201.

[16] Stephens R B, Snavely R A, Aglitskiy Y, et al. K_α fluorescence measurement of relativistic electron transport in the context of fast ignition[J]. Phys. Rev. E, 2004, 69(6): 066414.

[18] Lancaster K L, Green J S, Hey D S, et al. Measurements of energy transport patterns in solid density laser plasma interactions at intensities of 5×10²⁰W?cm⁻²
[J]. Phys. Rev. Lett., 2007, 98(12): 125002.

[20] Wharton K B, Hatchett S P, Wilks S C, et al. Experimental measurements of hot electrons generated by ultraintense (>10¹⁹W/cm²) laser-plasma interactions on

solid-density targets [J]. Phys. Rev. Lett., 1998, 81(4): 822.

[21] Bilski P, Budzanowski M, Olko P, et al. Properties of different thin-layer LiF: Mg, Cu, P TL detectors for beta dosimetry [J]. Radiat. Prot. Dosim, 1996, 66(1-4): 101.

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飞秒激光与固体靶相互作用的前向快电子束发散研究

A study for the divergence of forward fast-electron-beam produced by a femtosecond laser pulse on a solid target

PDF

可视化

摘要/Abstract

引用本文

使用本文

参考文献

[7] Reich Ch, Uschmann I, Ewald F, et al. Spatial characteristics of Kα X-ray emission from relativistic femtosecond laser plasmas[J]. Phys. Rev. E, 2003, 68(5): 056408.

[13] Akli K U, Storm M J, McMakon M, et al. Time dependence of fast electron beam divergence in ultraintense laser-plasma interactions[J]. Phys. Rev. E, 2012, 86(2): 026404.

[14] Vaziri Mohammad, Golshani Mojtaba, Sohaily Sozha, et al. Electron acceleration by linearly polarized twisted laser pulse with narrow divergence [J]. Phys. Plasmas, 2015, 22(3): 033118.

[15] Culfa O, Tallents G J, Rossall A K, et al. Plasma scale-length effects on electron energy spectra in high-irradiance laser plasmas[J]. Phys. Rev. E, 2016, 93 (4): 043201.

[16] Stephens R B, Snavely R A, Aglitskiy Y, et al. Kα fluorescence measurement of relativistic electron transport in the context of fast ignition[J]. Phys. Rev. E, 2004, 69(6): 066414.

[18] Lancaster K L, Green J S, Hey D S, et al. Measurements of energy transport patterns in solid density laser plasma interactions at intensities of 5×1020W?cm−2 [J]. Phys. Rev. Lett., 2007, 98(12): 125002.

[20] Wharton K B, Hatchett S P, Wilks S C, et al. Experimental measurements of hot electrons generated by ultraintense (>1019W/cm2) laser-plasma interactions on

solid-density targets [J]. Phys. Rev. Lett., 1998, 81(4): 822.

[21] Bilski P, Budzanowski M, Olko P, et al. Properties of different thin-layer LiF: Mg, Cu, P TL detectors for beta dosimetry [J]. Radiat. Prot. Dosim, 1996, 66(1-4): 101.

相关文章 5

编辑推荐

Metrics

[7] Reich Ch, Uschmann I, Ewald F, et al. Spatial characteristics of K_α X-ray emission from relativistic femtosecond laser plasmas[J]. Phys. Rev. E, 2003, 68(5): 056408.

[16] Stephens R B, Snavely R A, Aglitskiy Y, et al. K_α fluorescence measurement of relativistic electron transport in the context of fast ignition[J]. Phys. Rev. E, 2004, 69(6): 066414.

[18] Lancaster K L, Green J S, Hey D S, et al. Measurements of energy transport patterns in solid density laser plasma interactions at intensities of 5×10²⁰W?cm⁻²
[J]. Phys. Rev. Lett., 2007, 98(12): 125002.

[20] Wharton K B, Hatchett S P, Wilks S C, et al. Experimental measurements of hot electrons generated by ultraintense (>10¹⁹W/cm²) laser-plasma interactions on