Author: Gao, Z.F.
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THPMK068 High degree circular polarization at x-ray self-seeding FELs with crossed-planar undulators 4453
  • K. Li, H.X. Deng, Z.F. Gao, B. Liu, D. Wang
    SINAP, Shanghai, People's Republic of China
  Funding: Work was supported by the National Natural Science Foundation of China (11775293), the National Key Research and Development Program of China (2016YFA0401900).
The crossed undulator configuration for a high-gain free-electron laser (FEL) is well-known for the ability of versatile polarization control. However, the degree of polarization is very sensitive to power and phase between the two stages of crossed undulators. In this poster, we introduce the generation of high degree circular polarization hard x-ray FEL with crossed-planar undulator seeded by self-seeding. The reverse taper and taper undulator technology are employed for improving its performance. With the combination of high degree (>95%) circular polarization and flexibility of polarization switching, this scheme might be useful for some scientific research in the future.
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