Preliminary study of EEHG-based superradiant undulator radiation at the HLS-II storage ring

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Wei-Wei Gao, He-Ting Li and Lin Wang. Preliminary study of EEHG-based superradiant undulator radiation at the HLS-II storage ring[J]. Chinese Physics C, 2017, 41(7): 078101. doi: 10.1088/1674-1137/41/7/078101
Wei-Wei Gao, He-Ting Li and Lin Wang. Preliminary study of EEHG-based superradiant undulator radiation at the HLS-II storage ring[J]. Chinese Physics C, 2017, 41(7): 078101.  doi: 10.1088/1674-1137/41/7/078101 shu
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Received: 2016-11-21
Revised: 2017-03-25
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    Supported by National Natural Science Foundation of China (11305170)

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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Preliminary study of EEHG-based superradiant undulator radiation at the HLS-II storage ring

    Corresponding author: Wei-Wei Gao,
  • 1.  College of Mathematics and Physics, Fujian University of Technology, Fuzhou 350118, China
  • 2.  National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
Fund Project:  Supported by National Natural Science Foundation of China (11305170)

Abstract: We investigate storage ring-based Echo-Enabled Harmonic Generation (EEHG) superradiant undulator radiation as a possible scheme to obtain shorter wavelengths at the HLS-II (Hefei Light Source-II) storage ring. In this paper we give the designation of the storage ring based EEHG up to the 26th harmonic, where 31 nm vacuum ultraviolet light is radiated from an 800 nm seeded laser. The novelty of our design is that both the two dispersion sections of EEHG are realized by the storage ring's own magnet structure. In particular, the whole ring is used as the first dispersion section, and two modulators of the traditional EEHG can be done with the same undulator. These two dispersion sections are realized by changing the superperiod of the present lattice structure, and more precisely by changing the focusing strengths of the present structure. Since no additional magnets and chicanes are used, the beam circulates around the storage ring repeatedly, and thus this storage ring-based EEHG can have a higher repetition rate than a linac-based EEHG.

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