用于太赫兹光源的准等时性储存环的设计

介绍了一种获得准等时性储存环的方案，即调节Lattice参数，在色散段引入负色散函数从而降低线性滑相因子，获得短束团。根据此方案设计了用于相干太赫兹光源的准等时性储存环，结果给出了线形光学函数曲线以及粒子的动力学孔径，表明了通过调节四极铁参数可以达到降低束团长度获得准等时性储存环的目的。还设计了用于准等时性储存环弯铁处的真空室的3维模型，并对其类腔体部分的本征模进行了计算，得到特性阻抗与品质因数的比值在10-3量级以下，表明类腔体部分对束流的影响很小。

Design of a quasi-isochronous storage ring for THz light source

A quasi-isochronous storage ring is designed by means of manipulating lattice parameters to introduce a negative dispersion function to the dispersion section. This quasi-isochronous storage is ideal for a THz synchrotron radiation source. The simulations of the optics function and beam emittance shows the feasibility, and the result of trace on particles indicates that the designed ring has a considerable particle dynamic aperture.In addition, a three-dimensional model of the vacuum chamber used for photon radiation in the quasi-isochronous mode is also designed. The eigenmodes of the chamber is simulated, characteristic parameters such as quality factor, power loss and characteristic impedance are also calculated. The result shows that the vacuum chamber has little effect on the circulating beam.