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Modeling and multidimensional optimization of a tapered free electron laser
焦毅;Jiao, Y; Wu, J; Cai, Y; Chao, AW; Fawley, WM; Frisch, J; Huang, Z; Nuhn, HD; Pellegrini, C; Reiche, S
2012
发表期刊PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
卷号15期号:5页码:50704
摘要Energy extraction efficiency of a free electron laser (FEL) can be greatly increased using a tapered undulator and self-seeding. However, the extraction rate is limited by various effects that eventually lead to saturation of the peak intensity and power. To better understand these effects, we develop a model extending the Kroll-Morton-Rosenbluth, one-dimensional theory to include the physics of diffraction, optical guiding, and radially resolved particle trapping. The predictions of the model agree well with that of the GENESIS single-frequency numerical simulations. In particular, we discuss the evolution of the electron-radiation interaction along the tapered undulator and show that the decreasing of refractive guiding is the major cause of the efficiency reduction, particle detrapping, and then saturation of the radiation power. With this understanding, we develop a multidimensional optimization scheme based on GENESIS simulations to increase the energy extraction efficiency via an improved taper profile and variation in electron beam radius. We present optimization results for hard x-ray tapered FELs, and the dependence of the maximum extractable radiation power on various parameters of the initial electron beam, radiation field, and the undulator system. We also study the effect of the sideband growth in a tapered FEL. Such growth induces increased particle detrapping and thus decreased refractive guiding that together strongly limit the overall energy extraction efficiency.
学科领域Physics
DOI10.1103/PhysRevSTAB.15.050704
收录类别SCI
WOS记录号WOS:000303662800003
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被引频次:26[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224554
专题加速器中心
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焦毅;Jiao, Y,Wu, J,Cai, Y,et al. Modeling and multidimensional optimization of a tapered free electron laser[J]. PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS,2012,15(5):50704.
APA 焦毅;Jiao, Y.,Wu, J.,Cai, Y.,Chao, AW.,Fawley, WM.,...&Reiche, S.(2012).Modeling and multidimensional optimization of a tapered free electron laser.PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS,15(5),50704.
MLA 焦毅;Jiao, Y,et al."Modeling and multidimensional optimization of a tapered free electron laser".PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS 15.5(2012):50704.
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