论文标题
使用Ultrashort激光脉冲的高质量离子束的辐射压力加速度
Radiation pressure acceleration of high-quality ion beams using ultrashort laser pulses
论文作者
论文摘要
紧凑，高能离子束的产生是强烈激光相互作用的最有希望的应用之一，但是对光谱质量的控制仍然是一个出色的挑战。我们表明，在薄固体目标的辐射压力加速度中，电子加热的发作取决于雷利 - 泰勒在前表面的不稳定性的生长，并且必须控制以在光帆方面产生高频谱质量的离子束。不稳定性的生长速率对激光脉冲持续时间和强度施加了上限以达到高光谱束质量，我们证明，在这种最佳状态下，每个核子的最大峰离子束能量与目标密度，组成和激光能量无关（横向点尺寸）。我们的预测通过二维和三维的粒子模拟验证，这表明，对于使用Ultrashort（$ \ \ lyssim 25 $ fs）激光脉冲的最新和即将到来的实验设施，可以生产$ 100-300 $ MEV MEV PROBS，具有$ \ sim $ \ sim \ sim 30 \％$ \％$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ LASER-to-Laser-to-to-to-Energon to Energon Energy Confelipion效率。
The generation of compact, high-energy ion beams is one of the most promising applications of intense laser-matter interactions, but the control of the beam spectral quality remains an outstanding challenge. We show that in radiation pressure acceleration of a thin solid target the onset of electron heating is determined by the growth of the Rayleigh-Taylor-like instability at the front surface and must be controlled to produce ion beams with high spectral quality in the light sail regime. The growth rate of the instability imposes an upper limit on the laser pulse duration and intensity to achieve high spectral beam quality and we demonstrate that under this optimal regime, the maximum peak ion beam energy per nucleon is independent of target density, composition, and laser energy (transverse spot size). Our predictions are validated by two- and three-dimensional particle-in-cell simulations, which indicate that for recent and upcoming experimental facilities using ultrashort ($\lesssim 25$ fs) laser pulses it is possible to produce $100 - 300$ MeV proton beams with $\sim 30\%$ energy spread and high laser-to-proton energy conversion efficiency.
