基于斜余弦θ磁体技术的大6D动态孔径弱聚焦低发射度储存环
Weak focusing low emittance storage ring with large 6d dynamic aperture based on canted cosine theta magnet technology
摘要：
研制了一种具有大6D动态孔径的低发射度电子储存环。与使用具有优化的（和大的）水平相位提前的强聚焦磁单元的传统方法相反，其产生巨大的自然色度，我们采用了相对弱的聚焦晶格，每个单元具有低色度，因此具有宽的开和关动量动态孔径。弱聚焦发射度增长是不可避免的，我们通过将晶格切成许多短的、弯曲角度小的基本周期单元来进行补偿。为了减小尺寸，我们叠加聚焦梯度和色度补偿六极分量的偶极子场利用超导磁体的基础上倾斜余弦θ（CCT）绕组技术。其结果是一个模型晶格与50 μ m的水平发射度在3 GeV的光束能量，400-500米的周长和大6D孔径。
英文摘要：
We developed a low emittance electron storage ring with large 6D dynamic aperture. Contrary to the traditional approach using strong focusing magnetic cells with optimized (and large) horizontal phase advance, which yields huge natural chromaticity, we employed a relatively weak focusing lattice with low chromaticity per cell and, consequently, wide on- and off-momentum dynamic aperture. Inevitable for weak focusing emittance growth, we compensated by slicing the lattice into many short, with small bending angle, elementary periodic cells. To reduce the size, we superimposed focusing gradient and chromaticity compensating sextupole components over the dipole field utilizing superconducting magnets based on the Canted Cosine Theta (CCT) winding technology. The result is a model lattice with 50 pm horizontal emittance at 3 GeV beam energy, with 400-500 m circumference and large 6D aperture.
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