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学科主题: 物理化学
题名: Beam energy distribution influences on density modulation efficiency in seeded free-electron lasers
作者: Wang, Guanglei1;  Zhang, Weiqing1;  Wu, Guorong1;  Dai, Dongxu1;  Yang, Xueming1;  Feng, Chao2;  Zhang, Meng2;  Deng, Haixiao2;  Wang, Dong2;  Zhao, Zhentang2
通讯作者: 杨学明 ;  邓海啸
刊名: PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
发表日期: 2015-06-04
DOI: 10.1103/PhysRevSTAB.18.060701
卷: 18, 期:6, 页:060701
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Nuclear ;  Physics, Particles & Fields
研究领域[WOS]: Physics
英文摘要: The beam energy spread at the entrance of an undulator system is of paramount importance for efficient density modulation in high-gain seeded free-electron lasers (FELs). In this paper, the dependences of high harmonic bunching efficiency in high-gain harmonic generation (HGHG), echo-enabled harmonic generation (EEHG) and phase-merging enhanced harmonic generation (PEHG) schemes on the electron beam energy spread distribution are studied. Theoretical investigations and multidimensional numerical simulations are applied to the cases of uniform and saddle beam energy distributions and compared to a traditional Gaussian distribution. It shows that the uniform and saddle electron energy distributions significantly enhance the bunching performance of HGHG FELs, while they almost have no influence on EEHG and PEHG schemes. A further start-to-end simulation example demonstrated that, with the saddle distribution of sliced beam energy spread controlled by a laser heater, the 30th harmonic can be directly generated by a single-stage HGHG scheme for a soft x-ray FEL facility.
关键词[WOS]: GAIN HARMONIC-GENERATION ;  SIMULATION ;  COHERENT ;  FEL
语种: 英语
WOS记录号: WOS:000355624500001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143721
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

Recommended Citation:
Wang, Guanglei,Zhang, Weiqing,Wu, Guorong,et al. Beam energy distribution influences on density modulation efficiency in seeded free-electron lasers[J]. PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS,2015,18(6):060701.
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