Study on the Properties of Undulator Radiation in the Double-Minimum Beta Function Lattice
Hao Wen Luo1,2*, Sei Da Chen2, Ching Shiang Hwang2
1Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan
2Magnet Group, National Synchrotron Radiation Research Center, Hsinchu, Taiwan
* presenting author:įž…įš“æ–‡, email:luo.hw@nsrrc.org.tw
For the natural characteristic of the beta function, the effective electron beam size will increase with lengthening of straight section. This relation limits the gain of brilliance in the 3rd generation synchrotron radiation facilities. So three double-minimum beta straight section (double-Min-Beta) had been planned in the phase I of Taiwan Photon Source (TPS) storage ring to get higher brilliance light source. The use of the Wigner function as the
definition of the brilliance for segmented undulator in double-Min-Beta will be introduced. Several topics that are closely related to this subject will be described also.


Keywords: synchrotron radiation, double-minimum beta function, brilliance