Ion acceleration by collisionless shocks in high-intensity-laser-underdense-plasma interaction.
Ion acceleration by collisionless shocks in high-intensity-laser-underdense-plasma interaction.
复制标题
DOI：
10.1103/physrevlett.93.155003
复制
发表时间：
2004-10
影响因子：
8.6
通讯作者：
M. Wei;S. Mangles;Z. Najmudin;B. Walton;A. Gopal;M. Tatarakis;A. Dangor;Edward B. Clark;
中科院分区：
文献类型：
--
作者：
M. Wei;S. Mangles;Z. Najmudin;B. Walton;A. Gopal;M. Tatarakis;A. Dangor;Edward B. Clark;
在强度高达3 × 10(20) W/cm(2)的条件下，研究了超强短脉冲激光与低密度等离子体相互作用的离子加速。在与激光传播方向夹角为100度的方向上测得最大能量为13.2+/-1.0 MeV的氦离子。最大离子能量随等离子体密度缩放为n(0.70+/-0.05)(e)。二维细胞内粒子模拟表明，在高密度下可形成多次无碰撞冲击。冲击的相互作用是离子光谱中观察到的平台结构的原因，并导致离子加速度的增强，超出了激光单独的有源电位的可能。
Ion acceleration by the interaction of an ultraintense short-pulse laser with an underdense-plasma has been studied at intensities up to 3 x 10(20) W/cm(2). Helium ions having a maximum energy of 13.2+/-1.0 MeV were measured at an angle of 100 degrees from the laser propagation direction. The maximum ion energy scaled with plasma density as n(0.70+/-0.05)(e). Two-dimensional particle-in-cell simulations suggest that multiple collisionless shocks are formed at high density. The interaction of shocks is responsible for the observed plateau structure in the ion spectrum and leads to an enhanced ion acceleration beyond that possible by the ponderomotive potential of the laser alone.