An analysis of undulator optimization in self-seeding free electron lasers  

作　　者：贾启卡 

机构地区：[1]National Synchrotron Radiation Laboratory, University of Science and Technology of China

出　　处：《Chinese Physics C》2014年第8期94-96,共3页中国物理C（英文版）

基　　金：Supported by Major State Basic Research Development Program(2011CB808301);National Natural Science Foundation of China(11375199)

摘　　要：A simple analysis is given for the optimum length of undulator in a self-seeding free electron laser （FEL）. The obtained relations show the correlation between the undulator length and the system parameters. The power required for the seeding in the second part of the undulator and the overall efficiency of monochromatizating the seeding determine the length of the first part of the undulator; the magnitude of seeding power dominates the length of the second part of the undulator; the whole length of the undulator in a self-seeding FEL is determined by the overall efficiency for getting coherent seed, and is about half as long again as that of SASE, not including the dispersion section. The requirement of the dispersion section strength is also analyzed.A simple analysis is given for the optimum length of undulator in a self-seeding free electron laser （FEL）. The obtained relations show the correlation between the undulator length and the system parameters. The power required for the seeding in the second part of the undulator and the overall efficiency of monochromatizating the seeding determine the length of the first part of the undulator; the magnitude of seeding power dominates the length of the second part of the undulator; the whole length of the undulator in a self-seeding FEL is determined by the overall efficiency for getting coherent seed, and is about half as long again as that of SASE, not including the dispersion section. The requirement of the dispersion section strength is also analyzed.

关 键 词：free electron laser SELF-SEEDING UNDULATOR 

分 类 号：TN24[电子电信—物理电子学]