圆形加速器中束晕动力学扩散行为的探讨
Probing the diffusive behaviour of beam-halo dynamics in circular accelerators
摘要：
能量前沿的圆形粒子加速器基于超导磁体，超导磁体对束流损失非常敏感，因为这些可能会引起猝灭，即转换到正常导电状态。此外，存储在循环束中的能量是如此之大，以至于硬件完整性处于严重的危险之中，并且机器保护对于达到标称加速器性能变得至关重要。在这种具有挑战性的背景下，束晕成为性能限制的潜在来源，需要详细了解其动力学，以评估它是否会成为加速器的一个问题。在本文中，我们详细讨论了一种新的框架，基于扩散的方法，模拟束晕动力学。由Nekhoroshev定理给出的扰动级数的最优估计的函数形式被用来提供作用扩散系数的函数形式。我们的目标是提出一个有效的束晕动力学模型，并设计一个有效的实验程序，以获得一个准确的测量扩散系数。
英文摘要：
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. 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.
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