论文标题
在激光驱动的等离子体中，来自两阶段相干加速度的能量自旋质子束
Energetic spin-polarized proton beams from two-stage coherent acceleration in laser-driven plasma
论文作者
论文摘要
我们提出了一个方案，以克服自旋极化离子加速度极化损失的巨大挑战。当Petawatt激光脉冲穿过由双层平板和卤化卤化物气体组成的复合等离子体靶标穿透时，自我生成的激光驱动的等离子体构建了一个强向前移动的绝对纵向纵向电场。该领域具有不同的漂移速度，可以通过两阶段相干加速过程有效地增强质子的质子。它的优点不仅可以实现高能梁，而且还消除了加速质子的不想要的极化损失。我们通过汉密尔顿分析研究质子动力学，特别是触发两阶段相干加速的阈值。为了确认理论预测，我们执行三维PIC模拟，在该模拟中，获得了前所未有的质子束，能量近似于一半GEV和极化比$ \ sim $ 94 \％\％。
We propose a scheme to overcome the great challenge of polarization loss in spin-polarized ion acceleration. When a petawatt laser pulse penetrates through a compound plasma target consisting of a double layer slab and prepolarized hydrogen halide gas, a strong forward moving quasistatic longitudinal electric field is constructed by the self-generated laser-driven plasma. This field with a varying drift velocity efficiently boosts the prepolarized protons via a two-stage coherent acceleration process. Its merit is not only achieving a highly energetic beam but also eliminating the undesired polarization loss of the accelerated protons. We study the proton dynamics via Hamiltonian analyses, specifically deriving the threshold of triggering the two-stage coherent acceleration. To confirm the theoretical predictions, we perform three-dimensional PIC simulations, where unprecedented proton beams with energy approximating half GeV and polarization ratio $\sim$ 94\% are obtained.
