论文标题
探测圆形加速器中光束 - 霍拉动力学的扩散行为
Probing the diffusive behaviour of beam-halo dynamics in circular accelerators
论文作者
论文摘要
Circular particle accelerators at the energy frontier are based on superconducting magnets that are extremely sensitive to beam losses as these might induce quenches, i.e.\ transitions to the normal-conducting state.此外，存储在循环梁中的能量是如此之大，以至于硬件完整性受到严重危险，并且机器保护对于达到标称加速器性能至关重要。在这种挑战性的背景下，光束光环成为绩效限制的潜在来源，需要详细了解其动态，以评估这是否可能是加速器的问题。在本文中，我们详细讨论了一个基于扩散方法的新型框架，以模拟梁霍拉动力学。 Nekhoroshev定理给出的扰动序列的最佳估计值的功能形式用于提供动作扩散系数的功能形式。目的是为梁霍哈洛动力学提出有效的模型，并设计有效的实验程序，以获得对扩散系数的准确测量。
Circular particle accelerators at the energy frontier are based on superconducting magnets that are extremely sensitive to beam losses as these might induce quenches, i.e.\ transitions to the normal-conducting state. Furthermore, the energy stored in the circulating beam is so large that hardware integrity is put in serious danger, and machine protection becomes essential for reaching the nominal accelerator performance. In this challenging context, the beam halo becomes a potential source of performance limitations and its dynamics needs to be understood in detail to assess whether it could be an issue for the accelerator. In this paper, we discuss in detail a novel framework, based on a diffusive approach, to model beam-halo dynamics. The functional form of the optimal estimate of the perturbative series, as given by Nekhoroshev's theorem, is used to provide the functional form of the action diffusion coefficient. The goal is to propose an effective model for the beam-halo dynamics and to devise an efficient experimental procedure to obtain an accurate measurement of the diffusion coefficient.
