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Beam energy distribution influences on density modulation efficiency in seeded free-electron lasers
Wang, GL; Zhang, WQ; Wu, GR; Dai, DX; Yang, XM; Feng, C; Zhang, M; Deng, HX; Wang, D; Zhao, ZT
2015
Source PublicationPHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
Volume18Issue:6Pages:
Subtype期刊文献
AbstractThe 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.
KeywordGain Harmonic-generation Simulation Coherent Fel
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24398
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Wang, GL,Zhang, WQ,Wu, GR,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):—.
APA Wang, GL.,Zhang, WQ.,Wu, GR.,Dai, DX.,Yang, XM.,...&Zhao, ZT.(2015).Beam energy distribution influences on density modulation efficiency in seeded free-electron lasers.PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS,18(6),—.
MLA Wang, GL,et al."Beam energy distribution influences on density modulation efficiency in seeded free-electron lasers".PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS 18.6(2015):—.
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