Emittance growth from space-charge forces
Emittance growth from space-charge forces
复制标题
空间电荷力的发射增长
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
T. Wangler
中科院分区：
文献类型：
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作者：
T. Wangler
空间电荷诱导发射度增长已成为设计高强度、高亮度加速器和束流传输通道低速段的一个热门话题。本文回顾了空间电荷力的性质，讨论了匹配、空间电荷和发射度主导的梁、平衡梁的概念及其特性。其次是调查的一些工作在过去的25年中，以确定在离子和电子加速器的发射度增长的机制。我们总结了四个不同的机制，其特点，我们描述的整体结果。最后，我们给出了初始均方根失配层流光束演化的数值模拟结果。计算结果表明，对于空间电荷主导的梁，非线性空间电荷力产生了高度混沌的双分量梁，在二维相空间的投影中，该双分量梁由内核和扩散层组成。
Space‐charge‐induced emittance growth has become a topic of much recent interest for designing the low‐velocity sections of high‐intensity, high‐brightness accelerators and beam‐transport channels. In this paper we review the properties of the space‐charge force, and discuss the concepts of matching, space‐charge and emittance‐dominated beams, and equilibrium beams and their characteristics. This is followed by a survey of some of the work over the past 25 years to identify the mechanisms of this emittance growth in both ion and electron accelerators. We summarize the overall results in terms of four distinct mechanisms whose characteristics we describe. Finally, we show numerical simulation results for the evolution of initial rms‐mismatched laminar beams. The examples show that for space‐charge dominated beams, the nonlinear space‐charge forces produce a highly chaotic filamentation pattern, which in projection to the 2‐D phase spaces results in a 2‐component beam consisting of an inner core and a diffu...