Low emittance lattice design from first principles: Reverse bending and longitudinal gradient bends
Low emittance lattice design from first principles: Reverse bending and longitudinal gradient bends
复制标题
DOI：
10.1103/physrevaccelbeams.22.021601
复制
发表时间：
2018-10
影响因子：
1.7
通讯作者：
Bernard Riemann;A. Streun
中科院分区：
文献类型：
--
作者：
Bernard Riemann;A. Streun
弛豫理论最小发射度（TME）盒是设计新一代衍射极限存储环多弯消色差（MBA）晶格的常用方法。但是，通过在周期性晶格晶胞中组合纵向梯度弯曲（LGB）和反向弯曲（RB），可以在中等聚焦特性下实现显著较低的发射度。然而，单独的LGBs收益相当有限。我们调查的发射度实现不同的单元格类作为一个功能的细胞相位提前在一个最一般的框架，即与最小的假设，对特定的细胞光学。每种情况下都说明了一个实际的例子，一个现实的晶格细胞，最终导致的LGB/RB单元格的基线晶格的瑞士光源的升级。
The well-known relaxed theoretical minimum emittance (TME) cell is commonly used in the design of multi-bend achromat (MBA) lattices for the new generation of diffraction limited storage rings. But significantly lower emittance at moderate focusing properties can be achieved by combining longitudinal gradient bends (LGB) and reverse bends (RB) in a periodic lattice unit cell. LGBs alone, however, are of rather limited gain. We investigate the emittance achievable for different unit cell classes as a function of the cell phase advance in a most general framework, i.e. with a minimum of assumptions on the particular cell optics. Each case is illustrated with a practical example of a realistic lattice cell, eventually leading to the LGB/RB unit cell of the baseline lattice for the upgrade of the Swiss Light Source.