Focusing Dynamics of High-Energy Density, Laser-Driven Ion Beams
Focusing Dynamics of High-Energy Density, Laser-Driven Ion Beams
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DOI：
10.1103/physrevlett.108.055001
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发表时间：
2012-01-30
影响因子：
8.6
通讯作者：
Fuchs, J.
中科院分区：
文献类型：
--
作者：
Chen, S. N.;d'Humieres, E.;Fuchs, J.
研究了凹面固体靶产生的激光驱动离子束聚焦的动力学。观察到大部分离子束能量会聚在光斑直径为30微米的圆柱形靶心，这对于需要高束能量密度的应用是非常有利的。此外，不平衡的激光照射不会影响光束的聚焦性。然而，在聚焦过程中发生了显著的成丝，潜在地限制了这些聚焦光束对能量沉积区域的局部化。这些效应可能会影响这种高能量密度电子束在应用中的适用性，例如在质子驱动的快速点火中。
The dynamics of the focusing of laser-driven ion beams produced from concave solid targets was studied. Most of the ion beam energy is observed to converge at the center of the cylindrical targets with a spot diameter of 30 mu m, which can be very beneficial for applications requiring high beam energy densities. Also, unbalanced laser irradiation does not compromise the focusability of the beam. However, significant filamentation occurs during the focusing, potentially limiting the localization of the energy deposition region by these beams at focus. These effects could impact the applicability of such high-energy density beams for applications, e. g., in proton-driven fast ignition.