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首页> 外文期刊>Japanese journal of applied physics >Structure and Expansion Characteristics of Laser Ablation Tin Plasma into a Vacuum
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Structure and Expansion Characteristics of Laser Ablation Tin Plasma into a Vacuum

机译：激光烧蚀锡等离子体在真空中的结构和膨胀特性

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摘要

The internal structure and expansion characteristics of a laser ablation tin plasma into a vacuum have been investigated. A Q-switched Nd:YAG laser with the power density of 10~(11) W/cm~2 at the focal spot on the tin bulk target was employed to create the ablation plasma. The ion velocity distribution calculated from the time-of-flight measurements displays a multimodal structure; shifted-Maxwell-Boltzmann fitting indicates ions with multiple charge states exist in the ablation plume, and the temperature of the Knudsen layer was estimated to be ～4.0 × 10~5 and ～8.3 × 10~5 K for the laser energy of 77 and 129 mJ, respectively. Particle acceleration mechanisms were discussed according to the time resolved, two-dimensional images of the Sn I and Sn II plasma plume. The unstable adiabatic expansion with the formation of Knudsen layer was found dominates the expansion behavior of Sn I, and the Knudsen layer temperature was calculated to be 6.68 ×10~5K according to the front edge velocity of the Sn I plume.
机译：研究了激光烧蚀锡等离子体进入真空的内部结构和膨胀特性。利用Q开关Nd：YAG激光在锡块靶上的焦点处的功率密度为10〜（11）W / cm〜2，产生了烧蚀等离子体。从飞行时间测量中计算出的离子速度分布显示出多峰结构；位移Maxwell-Boltzmann拟合表明在消融羽流中存在具有多个电荷态的离子，对于77和70的激光能量，Knudsen层的温度估计为〜4.0×10〜5和〜8.3×10〜5K。分别为129 mJ。根据时间分辨的Sn I和Sn II等离子体羽的二维图像，讨论了粒子加速机制。发现形成Knudsen层的绝热绝热膨胀占主导地位Sn I的膨胀行为，根据Sn I羽流的前缘速度计算得出Knudsen层温度为6.68×10〜5K。

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  • 来源
    《Japanese journal of applied physics》 |2010年第5issue1期|P.056201.1-056201.6|共6页
  • 作者

    Qiushi Zhu; Junzaburo Yamada; Nozomu Kishi; Tomonao Hosokai; Masato Watanabe; Akitoshi Okino; Kazuhiko Horioka; Eiki Hotta;

  • 作者单位

    Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259 J2-35, Midori-ku, Yokohama 226-8502, Japan;

    rnDepartment of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259 J2-35, Midori-ku, Yokohama 226-8502, Japan;

    rnDepartment of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259 J2-35, Midori-ku, Yokohama 226-8502, Japan;

    rnDepartment of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259 J2-35, Midori-ku, Yokohama 226-8502, Japan;

    rnDepartment of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259 J2-35, Midori-ku, Yokohama 226-8502, Japan;

    rnDepartment of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259 J2-35, Midori-ku, Yokohama 226-8502, Japan;

    rnDepartment of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259 J2-35, Midori-ku, Yokohama 226-8502, Japan;

    rnDepartment of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259 J2-35, Midori-ku, Yokohama 226-8502, Japan;

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