超短超强激光与等离子体相互作用中背向产生的离子能谱

核聚变与等离子体物理 ›› 2012, Vol. 32 ›› Issue (2): 183-186.

超短超强激光与等离子体相互作用中背向产生的离子能谱

陈晓旭，唐翠明，洪伟，谷渝秋，王光昶

(1. 四川理工学院理学院，自贡 643002；2. 中国工程物理研究院激光聚变研究中心，绵阳 621900；3. 成都医学院物理教研室，成都 610083）

收稿日期:2011-10-09 修回日期:2012-02-11 出版日期:2012-06-15 发布日期:2011-06-14
作者简介:陈晓旭(1978-)，男，四川自贡人，讲师，硕士，主要从事激光与等离子体相互作用研究。
基金资助:
国家自然科学基金资助项目(10275056，10275057）；四川省教育厅科研项目(11ZB254)；四川理工学院理学院科研项目(09LXYB04)

Energy spectrum of ions generated by femtosecond laser and plasmas interaction at the back-side of target

CHEN Xiao-xu, TANG Cui-ming, HONG Wei, GU Yu-qiu, WANG Guang-chang

(1．Department of Physics and Mathematics, Sichuan University of Science & Engineering, Zigong 643002; 2. Research Center of Laser Fusion, CAEP, Mianyang 621900; 3. Teaching and Research Section of Physics, Chengdu Medical College, Chengdu 610083)

Received:2011-10-09 Revised:2012-02-11 Online:2012-06-15 Published:2011-06-14

摘要/Abstract

摘要：

实验研究了超短超强激光与7μm薄膜Cu靶的相互作用中靶背法线方向产生的质子和碳离子的能量分布。实验中采用CR39和Thomson磁谱仪相结合测量质子和碳离子能谱。实验中观察到了质子和C^4＋、C^3＋、C^2＋和C^1＋离子。实验结果表明：离子沿着靶背法线方向发射，离子在一定能量处出现截断；质子的产额远远高于碳离子产额；C^4＋、C^3＋、C^2＋和C¹⁺最大截止能之比约为4:3:2:1。

关键词: 超短超强激光, 质子, 碳离子, 能谱, CR39, Thomson磁谱仪

Abstract:

In the ultra-short and ultra-intense laser interaction with 7μm Cu target, we use CR39 and Thomson spectrometer to detect the energy spectrum of protons and carbon ions at the normal direction of target back. Protons, C⁴⁺, C³⁺, C²⁺ and C¹⁺ ions have been observed experimentally. In addition, the results show that the ions are emitted along the target rear-side normal direction and the ions were cut-off at a certain energy. What is more, the yield of proton is much higher than the one of carbon ions, and the ratio of the maximum cut-off energy of the C⁴⁺, C³⁺, C²⁺ and C¹⁺ ions is about 4: 3: 2: 1.

Key words: Ultra-short and ultra-intense laser, Proton, Carbon ion, Energy spectrum, CR39, Thomson spectrometer

中图分类号:

O434.12
TL65

陈晓旭，唐翠明，洪伟，谷渝秋，王光昶. 超短超强激光与等离子体相互作用中背向产生的离子能谱[J]. 核聚变与等离子体物理, 2012, 32(2): 183-186.

CHEN Xiao-xu, TANG Cui-ming, HONG Wei, GU Yu-qiu, WANG Guang-chang. Energy spectrum of ions generated by femtosecond laser and plasmas interaction at the back-side of target[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2012, 32(2): 183-186.

参考文献

[1] Perry M, Mourou G. Terawat to petawatt subpicosecond lasers [J]. Science, 1994, 264: 917.

[2] Pukhov A. Three-dimensional simulation of ion acceleration from a foil irradiated by a short-pulse laser [J]. Phys. Rev. Lett., 2001, 86: 3562.

[3] Borghesi M, Schiavi A, Campbell D H, et al. Proton imaging: a diagnostic for inertial confinement fusion/fast ignitor studies J]. Plasma Phys. Contr. Fusion, 2001, 43: A267–A276.

[4] Roth M, Cowan T E, Key M H, et al. Fast Ignition by Intense Laser-Accelerated Proton Beams [J]. Phys. Rev. Lett., 2001, 86: 436.

[5] 胡家成, 杨小元, 杨元第. 医用质子加速器输出剂量的测量 [J]. 现代测量与实验室管理, 2005, 6: 25-27.

[6] Dollar F, Matsuoka T, Petrov G M, et al. Control of energy spread and dark current in proton and ion beams generated in high-contrast laser [J]. Phys. Rev. Lett., 2011, 107: 065003.

[7] Schwoerer H, Pfotenhauer S, J ä ckel O, et al. Laser-plasma acceleration of quasi-monoenergetic protons from microstructured targets [J]. Nature, 2006, 439(26): 445-448.

[8] Hegelich B M, Albrightet B J, Cobble J, et al. Laser acceleration of quasi-monoenergetic MeV ion beams [J]. Nature, 2006, 439(26): 441-444.

[9] Chen Z L, Kodama R, Nakatsutsumi M, et al. Enhancement of energetic electrons and protons by cone guiding of laser light [J]. Phys. Rev. Lett., 2005, 71: 036403.

[10] Kaluz M, Schreiber J, Santala M I K, et al. Influlence of the laser prepulse on proton acceleration in Thin-Foil experiments [J]. Phys. Rev. Lett., 2004, 93: 045003.

[11] Wilks S C, Langdon A B, Cowan T E, et al. Energetic proton generation in ultra-intense laser-solid interactions [J]. Phys. Plasma, 2001, 8: 542 .

[12] 周维民. 超短超强激光与等离子体相互作用中质子发射的实验研究 [D]. 绵阳: 中国工程物理研究院, 2004. 45.

[13] 杨建伦, 温树槐, 徐荣昆, 等. 用于离子能谱测量的Thomson谱仪设计与数据处理技术 [J]. 核电子学与探测技术, 2004, 24(3): 242-245.