Laser-driven ion acceleration via target normal sheath acceleration in the relativistic transparency regime
Laser-driven ion acceleration via target normal sheath acceleration in the relativistic transparency regime
复制标题
DOI：
10.1088/1367-2630/aa9d47
复制
发表时间：
2018-01-11
影响因子：
3.3
通讯作者：
Zeil, K.
中科院分区：
文献类型：
--
作者：
Poole, P. L.;Obst, L.;Zeil, K.
我们提出了一个实验研究调查激光驱动的质子加速通过目标法向鞘层加速（TNSA）的目标厚度范围跨越典型的TNSA主导制度（类似于1 μ m）下降到低于相对论激光透明的开始（1 × 10（21）Wcm（-2））。厚度相关的最大质子能量的规模以及与TNSA模型下降到最薄的目标，而那些下类似的40 nmindicate的相对论透明度对TNSA的影响，观察通过光传输的差异，最大质子能量，和质子束的空间分布。倾斜激光入射（45度）允许进行大量诊断，以确定相互作用质量和细节：离子能量和空间分布沿沿着激光轴和前后靶法线方向测量;这些沿着与反射和透射光测量一起验证TNSA在高对比度相互作用期间占主导地位，即使对于超薄靶也是如此。此外，3D粒子模拟定性地支持从超薄薄膜的目标正常定向质子加速的实验观察。
We present an experimental study investigating laser-driven proton acceleration via target normal sheath acceleration (TNSA) over a target thickness range spanning the typical TNSA-dominant regime (similar to 1 mu m) down to below the onset of relativistic laser-transparency ( 1 x 10(21) Wcm(-2)). Thickness dependent maximum proton energies scale well with TNSA models down to the thinnest targets, while those under similar to 40 nmindicate the influence of relativistic transparency on TNSA, observed via differences in light transmission, maximum proton energy, and proton beam spatial profile. Oblique laser incidence (45 degrees) allowed the fielding of numerous diagnostics to determine the interaction quality and details: ion energy and spatial distribution was measured along the laser axis and both front and rear target normal directions; these along with reflected and transmitted light measurements on-shot verify TNSA as dominant during high contrast interaction, even for ultra-thin targets. Additionally, 3D particle-in-cell simulations qualitatively support the experimental observations of target-normal-directed proton acceleration from ultra-thin films.