Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats
Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats
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三弯消色差透镜中相干同步加速器辐射引起的发射度增长的抑制
DOI：
10.1088/1674-1137/39/5/057001
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发表时间：
2015
影响因子：
3.6
通讯作者：
CUI Xiao-Hao
中科院分区：
文献类型：
--
作者：
HUANG Xi-Yang;JIAO Yi;XU Gang;CUI Xiao-Hao
在束团长度短、束流高峰大的高亮度光源和直线对撞机中，弯曲路径的相干同步辐射（CSR）效应对横向发射度的稀释起着重要作用。抑制由CSR引起的发射度增长对于保持光束质量和帮助改善机器性能是至关重要的。结果表明，双弯消色差透镜（DBA）中的CSR效应可以用二维点反冲分析方法进行分析。本文应用该方法分析了能量恢复直线加速器光学设计中常用的对称布局三弯消色差透镜的CSR效应。给出了消除CSR线性效应的条件，并通过数值模拟进行了验证。结果表明，在此条件下，束流的发射度可以保持不变，并且在很大程度上对束流初始横向相空间分布的起伏有很高的容忍度。
The coherent synchrotron radiation (CSR) effect in a bending path plays an important role in transverse emittance dilution in high-brightness light sources and linear colliders, where the electron beams are of short bunch length and high peak current. Suppression of the emittance growth induced by CSR is critical to preserve the beam quality and help improve the machine performance. It has been shown that the CSR effect in a double-bend achromat (DBA) can be analyzed with the two-dimensional point-kick analysis method. In this paper, this method is applied to analyze the CSR effect in a triple-bend achromat (TBA) with symmetric layout, which is commonly used in the optics designs of energy recovery linacs (ERLs). A condition of cancelling the CSR linear effect in such a TBA is obtained, and is verified through numerical simulations. It is demonstrated that emittance preservation can be achieved with this condition, and to a large extent, has a high tolerance to the fluctuation of the initial transverse phase space distribution of the beam.
DOI：
10.1007/978-3-662-02903-9
发表时间：
1993-10
期刊：
--
影响因子：
--
作者：
H. Wiedemann
通讯作者：
H. Wiedemann