论文标题
快速电荷重新分布，导致高强度离子束中的核心空心
Rapid charge redistribution leading to core hollowing in a high-intensity ion beam
论文作者
论文摘要
最近，报告了完整6D加速器束分布的第一个直接测量[1]。这项工作观察到能量和横向坐标之间的相关性，为此，能量分布在横向芯附近被挖空并双峰。在本文中，由于非线性空间电荷力的速度扰动而导致最初不相关的高密度束束的扩展中出现了类似的结构。当将6D相空间投射到一维轴和二维轴上时，该空心被遮盖了。在加速器系统中，这种现象尚未得到广泛认可，但是可以将相似之处吸引到激光离子化的纳米群和电子源以进行衍射。尽管这种效果提供了对测量核心相关性的起源的见解，但它并未提供完整的描述。可以通过射频四极杆来获得更好的测量结构的再现。 [1] B. Cathey，S。Cousineau，A。Aleksandrov和A. Zhukov，PRL 121，064804（2018）。
Recently, the first direct measurement of a full 6D accelerator beam distribution was reported [1]. That work observed a correlation between energy and transverse coordinates, for which the energy distribution becomes hollowed and double-peaked near the transverse core. In this article, a similar structure is shown to emerge in expansion of an initially uncorrelated, high density bunched beam as the result of velocity perturbation from nonlinear space charge forces. This hollowing is obscured when the 6D phase space is projected onto one- and two-dimensional axes. This phenomenon has not been widely recognized in accelerator systems, but parallels can be drawn to observations of laser-ionized nanoclusters and electron sources for diffraction. While this effect provides insight into the origin of the measured core correlation, it does not provide a complete description. A better reproduction of the measured structure can be obtained via self-consistent simulation through the radio-frequency quadrupole. [1] B. Cathey, S. Cousineau, A. Aleksandrov, and A. Zhukov, PRL 121, 064804 (2018).
