Optimization of the lattice function in the planar undulator applied for terahertz FEL oscillators

被引：1
|
作者：
Yang Lei [1 ]
Qin Bin [1 ]
Yang Jun [1 ]
Liu Xia-Ling [1 ]
Tan Ping [1 ]
Hu Tong-Ning [1 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Peoples R China
来源：
CHINESE PHYSICS C | 2014年 / 38卷 / 03期
关键词：
planar undulator; beam transport; lattice optimization; FREE-ELECTRON LASERS;
D O I：
10.1088/1674-1137/38/3/037004
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Since the beta function of the electron beam within the undulator has a great influence on the power gain of the free electron laser (FEL), optimization of the undulator lattice becomes important. In this paper, the transfer matrix of the planar undulator is obtained from differential equations of the electron motion. Based on this, the lattice function of the planar undulator in a terahertz FEL oscillator proposed by Huazhong University of Science and Technology (HUST-FEL) is optimized and the expressions of the average beta function are derived. The accuracy of the optimization result was confirmed well by the numerical method. The application range of this analytical method is given as well. At last, the emittance growth in the horizontal direction due to the attenuation of the magnetic field is discussed.
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页数：6
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