论文标题
朝着带有孔目标的激光离子加速度
Towards Laser Ion Acceleration With Holed Targets
论文作者
论文摘要
尽管现在将平坦翼与当前可用的激光强度的相互作用视为常规过程，但在过去的十年中，将重点放在具有复杂几何形状的靶标，旨在增加离子能量。这项工作提出了一个目标几何形状，其中两个对称的侧孔和一个中央孔被钻入箔纸。对聚乙烯靶标的二维粒子模拟进行了对各种侧孔和中央孔长度组合的研究，激光强度为5.2x10^21 W CM^-2。孔目标显示转化效率显着提高，这对应于电子，质子和碳离子的不同目标构型。此外，激光脉冲的衍射导致方向性高能电子束，温度约为40 meV或比平翼高的7倍。因此，较高的转化效率导致孔靶的最大质子能量显着增强。
Although the interaction of a flat-foil with currently available laser intensities is now considered a routine process, during the last decade emphasis is given to targets with complex geometries aiming on increasing the ion energy. This work presents a target geometry where two symmetric side-holes and a central-hole are drilled into the foil. A study of the various side-holes and central-hole length combinations is performed with 2-dimensional particle-in-cell simulations for polyethylene targets and a laser intensity of 5.2x10^21 W cm^-2. The holed-targets show a remarkable increase of the conversion efficiency, which corresponds to a different target configuration for electrons, protons and carbon ions. Furthermore, diffraction of the laser pulse leads to a directional high energy electron beam, with a temperature of ~40 MeV or seven times higher than in the case of a flat-foil. The higher conversion efficiency consequently leads to a significant enhancement of the maximum proton energy from holed-targets.
