Inhibition of fast electron energy deposition due to preplasma filling of cone-attached targets
Inhibition of fast electron energy deposition due to preplasma filling of cone-attached targets
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DOI：
10.1063/1.2903054
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发表时间：
2008-04
影响因子：
2.2
通讯作者：
S. Baton;M. Koenig;J. Fuchs;A. Benuzzi-Mounaix;P. Guillou;B. Loupias;T. Vinci;L. Gremillet
中科院分区：
文献类型：
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作者：
S. Baton;M. Koenig;J. Fuchs;A. Benuzzi-Mounaix;P. Guillou;B. Loupias;T. Vinci;L. Gremillet
我们提出了实验和数值计算结果的传播和能量沉积的激光产生的快电子到锥形目标。第一部分报告了在各种配置下进行的实验测量，以评估圆锥形目标相对于标准平面目标的预测优势。在这里研究的条件下，发现在1.057μm激光波长下照射的锥形引导靶中的快速电子感生加热要弱得多，而激光脉冲的倍频允许我们弥合锥形和平面靶之间的差异。这一结果强调了prepulse产生的等离子体，其约束在圆锥形几何形状增强的偏见的作用。第二部分主要研究激光与圆锥相互作用的粒子模拟。与实验数据定性一致，计算表明，一个大的预等离子体的存在导致的快电子密度和能量通量显着下降。
We present experimental and numerical results on the propagation and energy deposition of laser-generated fast electrons into conical targets. The first part reports on experimental measurements performed in various configurations in order to assess the predicted benefit of conical targets over standard planar ones. For the conditions investigated here, the fast electron-induced heating is found to be much weaker in cone-guided targets irradiated at a laser wavelength of 1.057μm, whereas frequency doubling of the laser pulse permits us to bridge the disparity between conical and planar targets. This result underscores the prejudicial role of the prepulse-generated plasma, whose confinement is enhanced in conical geometry. The second part is mostly devoted to the particle-in-cell modeling of the laser-cone interaction. In qualitative agreement with the experimental data, the calculations show that the presence of a large preplasma leads to a significant decrease in the fast electron density and energy flux...