Fast ion acceleration in ultraintense laser interactions with an overdense plasma.
Fast ion acceleration in ultraintense laser interactions with an overdense plasma.
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DOI：
10.1103/physreve.69.036407
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发表时间：
2004-03
期刊：
影响因子：
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通讯作者：
H. Habara;R. Kodama;Y. Sentoku;N. Izumi;Y. Kitagawa;K. Tanaka;K. Mima;T. Yamanaka
中科院分区：
文献类型：
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作者：
H. Habara;R. Kodama;Y. Sentoku;N. Izumi;Y. Kitagawa;K. Tanaka;K. Mima;T. Yamanaka
为了研究超强激光等离子体与固体靶相互作用中的离子加速过程，测量了氘-氘（D-D）核反应的中子谱。当（50-100 TW，0.5-1 ps）激光斜入射氘代塑料靶时，得到了激光偏振、强度和等离子体密度尺度长度的函数关系。实验数据进行了比较与三维Monte Carlo模拟。结果表明，离子的动量分布被准直，并直接进入靶的主体的目标的法线方向的能量是线性正比于激光强度。随着激光预脉冲强度的增加，被加速离子的分布由各向同性变为各向异性。所有的结果表明，离子加速是由静电场所产生的电荷位移的热电子在目标表面。
In order to study the ion acceleration processes in ultraintense laser-plasma interactions with solid targets, neutron spectra from deuteron-deuteron (D-D) nuclear reactions were measured. Spectra were obtained when (50-100 TW, 0.5-1 ps) laser light irradiated obliquely incident deuterated plastic targets as a function of laser polarization, intensity, and density scale length of the preformed plasma. The experimental data are compared with three-dimensional Monte Carlo simulations. The results indicate that the ion momentum distribution is collimated and directed into the bulk of the target to the target normal direction with an energy that is linearly proportional to the laser intensity. The distribution of the accelerated ions was observed to change from isotropic to anisotropic with laser prepulse intensity. All the results indicate that the ion acceleration is dominated by an electrostatic field generated from a charge displacement of the hot electrons at the target surface.