论文标题
通过飞秒激光事件平行于微孔板，单烯型高能离子源
Monoenergetic High-energy Ion Source via Femtosecond Laser Incident Parallel to a Microplate
论文作者
论文摘要
使用完全三维的粒子中的粒子模拟，我们表明，随时可用的飞秒激光系统可以通过平行数以百万微米长等离子体板的平行照射来稳定地生成具有数百meV能量的质子束，并在$ \ sim1 \％$级别下以$ \ sim1 \％$级别的含量低。当激光脉冲沿板上扫描时，它拖出了巨大的电荷（$ \ sim $ 100 nc）的准能电子，并将它们沿板表面加速到超源性磁场。当该密集的电子电流到达板的后端时，它会诱导强烈的静电场。由于电子的空间充电，纵向场在横向场聚焦时变为束。与典型的靶标在相同的激光参数下，总之，这导致了高度的单能能谱和更高的质子能量。
Using fully three-dimensional particle-in-cell simulations, we show that readily available femtosecond laser systems can stably generate proton beams with hundred MeV energy and low spread at $\sim1\%$ level by parallel irradiation of a tens of micrometers long plasma plate. As the laser pulse sweeps along the plate, it drags out a huge charge ($\sim$100 nC) of collimated energetic electrons and accelerates them along the plate surface to superponderomotive energies. When this dense electron current arrives at the rear end of the plate, it induces a strong electrostatic field. Due to the excessive space charge of electrons, the longitudinal field becomes bunching while the transverse field is focusing. Together, this leads to a highly monoenergetic energy spectrum and much higher proton energy as compared to simulation results from typical target normal sheath acceleration and radiation pressure acceleration at the same laser parameters.
