Secondary electron multipacting in proton bunch
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摘要: 电子云不稳定性是强流质子加速器稳定运行的一个重大障碍。在电子云积累的过程中，二次电子多级倍增是电子云的主要来源。二次电子多级倍增机制可以用电子的运动和能量增益来分析。为了得到电子云的密度及分布，编写了一个模拟程序用来跟踪电子云的发展演化过程。分析了在质子束团作用下电子的运动，分析二次电子多级倍增的原因，并用模拟程序进行了计算，结果发现电子云与束团的纵向分布密切相关。Abstract: The electron cloud instability is believed to be an obstacle for the high intensity proton accelerators. The secondary electron multipacting is responsible for the development of the electron cloud. It can be explained by the energy gain and motion of electrons. For acquiring the density and the distribution of the electron cloud, a program has been developed to simulate the evolution of the electron cloud. This paper analyzes the motion of electrons under beam force, and proposes the reason for the secondary electron multipacting. The analyses are in agreement with the simulation result.
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