论文标题
由单物种等离子光片产生的高度自旋偏振多GEV电子束
Highly spin-polarized multi-GeV electron beams generated by single-species plasma photocathodes
论文作者
论文摘要
已经证明了基于等离子体的加速器中的高梯度和高效加速度，它显示了其作为在粒子物理能量前沿运行的未来对撞机的基础。但是，使用基于等离子体的加速器在这种对撞机中生成和加速所需的自旋偏振光束一直是一个长期的挑战。在这里，我们表明，高度相对论，高电流电子束穿过单物种（ytterbium）蒸气通过主要电离两个外部6S电子来激发了非线性等离子体唤醒。通过圆极化激光将所得的YB2+离子进一步照相，将4F14电子注入该尾流中，产生了高度自旋的偏振光束。将时间依赖性的Schrodinger方程模拟与粒子中的模拟相结合，我们表明，仅在41 cm中，可以产生一个次秒，高流动性（4 ka）电子束，最多可加速56％的净自旋极化。这种相对简单的方案解决了在基于等离子体的加速器中产生自旋极化电子电子的困惑问题。
High-gradient and high-efficiency acceleration in plasma-based accelerators has been demonstrated, showing its potential as the building block for a future collider operating at the energy frontier of particle physics. However, generating and accelerating the required spin-polarized beams in such a collider using plasma-based accelerators has been a long-standing challenge. Here we show that the passage of a highly relativistic, high-current electron beam through a single-species (ytterbium) vapor excites a nonlinear plasma wake by primarily ionizing the two outer 6s electrons. Further photoionization of the resultant Yb2+ ions by a circularly polarized laser injects the 4f14 electrons into this wake generating a highly spin-polarized beam. Combining time-dependent Schrodinger equation simulations with particle-in-cell simulations, we show that a sub-femtosecond, high-current (4 kA) electron beam with up to 56% net spin polarization can be generated and accelerated to 15 GeV in just 41 cm. This relatively simple scheme solves the perplexing problem of producing spin-polarized relativistic electrons in plasma-based accelerators.
