Laser-Driven Shock Acceleration of Monoenergetic Ion Beams
Laser-Driven Shock Acceleration of Monoenergetic Ion Beams
复制标题
DOI：
10.1103/physrevlett.109.215001
复制
发表时间：
2012-11-20
影响因子：
8.6
通讯作者：
Joshi, C.
中科院分区：
文献类型：
--
作者：
Fiuza, F.;Stockem, A.;Joshi, C.
我们发现，中等马赫数的无碰撞静电冲击可以加速单能离子束在长标度指数衰减的等离子体剖面中传播。强激光脉冲在临界密度附近产生强烈的等离子体加热和密度陡化，可以在扩展的等离子体中以高速传播。由于与缓慢下降的密度分布相关的小而恒定的鞘层电场，单能离子束的产生是可能的。通过理论和多维粒子模拟，确定了高质量高能离子束加速的条件。离子能量与激光强度的比例关系表明，用最先进的100TW级激光系统可以产生类似于200 MeV的质子束。
We show that monoenergetic ion beams can be accelerated by moderate Mach number collisionless, electrostatic shocks propagating in a long scale-length exponentially decaying plasma profile. Strong plasma heating and density steepening produced by an intense laser pulse near the critical density can launch such shocks that propagate in the extended plasma at high velocities. The generation of a monoenergetic ion beam is possible due to the small and constant sheath electric field associated with the slowly decreasing density profile. The conditions for the acceleration of high-quality, energetic ion beams are identified through theory and multidimensional particle-in-cell simulations. The scaling of the ion energy with laser intensity shows that it is possible to generate similar to 200 MeV proton beams with state-of-the-art 100 TW class laser systems.