掌上型类同步辐射源
A Palmtop Synchrotron-like Radiation Source
摘要：
同步辐射光源是科学研究和许多实际应用中非常有用的工具。目前，最先进的同步加速器依赖于传统的加速器，其中电子沿直线加速并在弯曲磁体或其他插入装置中辐射。然而，这些设施通常很大，而且费用昂贵。在这里，我们提出了一个紧凑的全光学同步辐射源的基础上，激光等离子体加速无论是在一个直线或弯曲的等离子体通道。当激光脉冲在直线通道中离轴注入时，激光脉冲的质心振荡引起包括被俘获电子在内的整个加速结构的摇摆运动，从而产生具有可调谐光谱的强同步辐射。它进一步表明，环形同步加速器是可能的弯曲等离子体通道。由于等离子体内部强烈的加速和弯曲场，源的中心部分可以在手掌大小内制造。这种紧凑型光源具有高度的灵活性和可调谐性，一旦实现，将得到广泛的应用，弥补大型同步辐射装置的不足。
英文摘要：
Synchrotron radiation sources are immensely useful tools for scientific researches and many practical applications. Currently, the state-of-the-art synchrotrons rely on conventional accelerators, where electrons are accelerated in a straight line and radiate in bending magnets or other insertion devices. However, these facilities are usually large and costly. Here, we propose a compact all-optical synchrotron-like radiation source based on laser-plasma acceleration either in a straight or in a curved plasma channel. With the laser pulse off-axially injected in a straight channel, the centroid oscillation of the pulse causes a wiggler motion of the whole accelerating structure including the trapped electrons, leading to strong synchrotron-like radiations with tunable spectra. It is further shown that a ring-shaped synchrotron is possible in a curved plasma channel. Due to the intense acceleration and bending fields inside plasmas, the central part of the sources can be made within palm size. With its potential of high flexibility and tunability, such compact light sources once realized would find applications in wide areas and make up the shortage of large synchrotron radiation facilities.
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