Tayyab M, Bagchi S, Ramakrishna B, Mandal T, Upadhyay A, Ramis R, Chakera J A, Naik P A, Gupta P D
Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India.
E.T.S.I. Aeronáuticos, Universidad Politécnica de Madrid, 28040 Madrid, Spain.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Aug;90(2):023103. doi: 10.1103/PhysRevE.90.023103. Epub 2014 Aug 21.
We report on the proton acceleration studies from thin metallic foils of varying atomic number (Z) and thicknesses, investigated using a 45 fs, 10 TW Ti:sapphire laser system. An optimum foil thickness was observed for efficient proton acceleration for our laser conditions, dictated by the laser ASE prepulse and hot electron propagation behavior inside the material. The hydrodynamic simulations for ASE prepulse support the experimental observation. The observed maximum proton energy at different thicknesses for a given element is in good agreement with the reported scaling laws. The results with foils of different atomic number Z suggest that a judicious choice of the foil material can enhance the proton acceleration efficiency, resulting into higher proton energy.
我们报告了使用45飞秒、10太瓦的钛宝石激光系统对不同原子序数（Z）和厚度的薄金属箔进行的质子加速研究。对于我们的激光条件，观察到了实现高效质子加速的最佳箔厚度，这由激光自发辐射放大（ASE）预脉冲以及材料内部的热电子传播行为所决定。ASE预脉冲的流体动力学模拟支持了实验观察结果。对于给定元素，在不同厚度下观察到的最大质子能量与报道的标度律吻合良好。不同原子序数Z的箔的实验结果表明，明智地选择箔材料可以提高质子加速效率，从而获得更高的质子能量。
