论文标题
准单色明亮伽马射线射线从同步的康普顿散射通过方位角时空耦合
Quasi-monochromatic bright gamma-ray generation from synchronized Compton scattering via azimuthal spatial-temporal coupling
论文作者
论文摘要
高能光子可以通过能量电子和激光脉冲之间的碰撞中的反向康普顿散射（IC）产生。激光等离子体加速器的开发通过将电子从激光Wakefield加速器碰撞到其由等离子镜反射的高功率驱动脉冲中，可以使紧凑和全光伽马射线源源。然而，在这种情况下，光聚焦的定律阻碍了高光子产率和单色频谱的实现。我们提出了一个方位角时空转换器，该转换器使用螺旋抛物线几何形状将焦点强度从激光斑点尺寸分解。它将驱动激光束分解为几乎相同的差异角度和焦点深度的脉冲序列，从而在优化的线性状态下产生同步IC。该方案解决了高效率和狭窄的能量扩散之间的困境，从而促进了使用相对论场强的高功率激光器促进单色伽马射线的产生。
High energy photons can be generated via inverse Compton scattering (ICS) in the collision between energetic electrons and intense laser pulse. The development of laser plasma accelerators promises compact and all-optical gamma-ray sources by colliding the electrons from laser wakefield accelerators to its high-power driving pulse reflected by a plasma mirror. However, the law of optical focusing hinders realization of both high photon yield and monochromatic spectrum in this scenario. We propose an azimuthal spatial-temporal convertor that decouples the focal field strength from laser spot size using helical parabolic geometry. It decomposes the driving laser beam into a pulse train of almost identical divergence angle and focal depth, creating synchronized ICS in the optimized linear regime. The scheme resolves the dilemma between high efficiency and narrow energy spread, facilitating the generation of monochromatic gamma-ray using high power lasers beyond relativistic field strengths.
