Analytic model for halo formation in high current ion linacs.
Analytic model for halo formation in high current ion linacs.
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DOI：
10.1103/physrevlett.73.1247
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发表时间：
1994-08
影响因子：
8.6
通讯作者：
R. Gluckstern
中科院分区：
文献类型：
--
作者：
R. Gluckstern
建立了强流离子直线加速器中晕形成的方位对称二维模型。驱动项是由直线加速器沿着的横向失配引起的“呼吸”振荡，通过参数共振导致芯中离子振幅的增长。随着离子振幅的增长，其波数增加，增强共振。这导致了围绕核心的晕圈的形成。我们探讨了这一机制的依赖性上的调抑郁症和失配的大小。该模型与洛斯阿拉莫斯的模拟结果吻合良好，但还没有包括模拟中观察到的混乱的影响，因为音调抑郁症变得严重。
We construct an azimuthally symmetric 2D model for halo formation in high current ion linacs. The driving term, a breathing'' oscillation caused by a transverse mismatch along the linac, leads to growth of ion amplitudes in the core through the parametric resonance. As the ion amplitude grows, its wave number increases, enhancing the resonance. This leads to the formation of a halo surrounding the core. We explore the dependence of this mechanism on the tune depression and the size of the mismatch. The model agrees well with simulations at Los Alamos, but does not yet include the effects of chaos observed in the simulations as the tune depression becomes severe.