使用激发态卤化氢的自旋极化电子束等离子体光电阴极
A plasma photocathode for spin-polarized electron beams via state-selected hydrogen halide photofragments
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中文总结 AI 辅助
本文提出基于预极化卤化氢气体的类光电阴极方案，通过双组分电离介质产生自旋极化电子束，模拟显示其极化度接近传统源，为等离子体加速器的极化源提供了新途径。
中文摘要 AI 辅助
自旋极化电子束是探测基本对称性、寻找超出标准模型新物理的关键工具。尽管等离子体加速器是迈向更高能量前沿的有前景路径，但迄今未能提供具有竞争力的极化源：现有方案难以实现，且可达到的极化度远低于传统源。本文提出一种类光电阴极方案，应用于预极化卤化氢气体。真空紫外（VUV）与可见光激光脉冲激发卤原子，形成由低阈值激发态卤原子和高阈值极化氢原子组成的双组分电离介质。粒子模拟显示，约10皮库（pC）的 witness 束流可保留初始极化度P₀的97%：对于未取向键，P≈68%（P₀=70%）；对于取向键，P=97%（P₀=100%），性能可与最先进的传统源相媲美。
英文摘要
Spin-polarized electron beams are essential tools for probing fundamental symmetries and for the search beyond the Standard Model. While plasma-based accelerators are a promising pathway towards higher-energy frontiers, they have so far failed to deliver a competitive polarized source: existing proposals are challenging to realize and achievable polarizations remain far below conventional sources. Here, we introduce a photocathode-like scheme, applied to a gas of pre-polarized hydrogen and halogen atoms. A VUV and a visible laser pulse excite the halogen atoms to create a two-component ionization medium, consisting of low-threshold excited halogen atoms and high-threshold polarized hydrogen. Particle-in-cell simulations show witness beams with tens of pC charge retaining up to 97% of the initial polarization, rivaling state-of-the-art conventional sources.
