Design of Ultra-low Emittance Ring with Multi-bend Lattice on a Torus-knot
Design of Ultra-low Emittance Ring with Multi-bend Lattice on a Torus-knot
复制标题
环面结多弯晶格超低发射环设计
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
S. Sasaki
中科院分区：
文献类型：
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作者：
A. Miyamoto;S. Sasaki
我们提出了一种环面结型同步加速器辐射环，其光束轨道不是一圈闭合，而是绕环多圈后闭合。目前，我们正在为我们未来的计划“HiSOR-II”设计一个基于(11, 3)环面结形状的新环。该环是中低能光源环，光束能量为700 MeV。最近，一些光源环通过对环的弧形部分采用多弯曲方案来实现非常低的发射率，从而达到衍射极限光。对于中低能量的VUV-SX光源环来说并不困难，因为小于10 nmrad的电子束可以提供小于10eV能量的衍射极限光。然而，多弯晶格具有许多磁体族，因此确定晶格的参数并不容易。特别是，对于环面结型SR环来说是困难的，因为在轨道交叉点周围存在很多几何限制。我们介绍了具有创新奇特形状的超低发射率光源环的设计过程和规格的细节。
We proposed a torus knot type synchrotron radiation ring in that the beam orbit does not close in one turn but closes after multiple turns around the ring. Currently, we are designing a new ring based on the shape of a (11, 3) torus knot for our future plan ‘HiSOR-II.’ This ring is mid-low energy light source ring with beam energy of 700 MeV. Recently some light source rings are achieving very low emittance that reaches a diffraction limited light by adopting a multi-bend scheme to the arc section of the ring. It is not difficult for low-mid energy VUV-SX light source ring because the electron beam less than 10 nmrad can provide the diffraction limited light in the energy less than 10eV. However the multi-bend lattice has many families of the magnets, therefore it is not easy to decide the parameters of the lattice. Especially, it is difficult for the torus knot type SR ring because there is a lot of geometric limitation around the cross points of orbits. We present the details of the designing procedure and the specifications of the ultra-low emittance light source ring having innovatively odd shape.