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- W2551369547 abstract "The Duke FEL and High Intensity Gamma-ray Source (HI�� S) facility is operated with an electron beam from 0.24 to 1.2 GeV and an FEL photon beam from 190 to 1060 nm. The energy range of the gamma-ray beam is from 1 MeV to about 100 MeV, with the maximum total gamma-flux of more then 10 10 gammas per second around 10 MeV. Production of the high-intensity, high energy gamma-beams of 60-158 MeV using UV-VUV mirrors of 250 - 150 nm requires high current and high energy electron beams (0.9-1.20 GeV). Radiation damage to the downstream FEL mirror becomes more severe for VUV FEL operation at 190 nm and below. At these VUV wavelengths with GeV electrons, the radiation from the end-of-arc (EOA) bending magnets, instead of the radiation from helical FEL wigglers, is the dominant cause of a rapid degradation of the downstream mirror. In this work, we propose a concept of a soft orbit bump using designated orbit correctors to significantly reduce the radiation from the EOA dipole toward the FEL mirror. The strength of magnetic field of these correctors is limited to produce a radiation with a critical wavelength close or below the FEL wavelength." @default.
- W2551369547 created "2016-11-30" @default.
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- W2551369547 date "2012-01-01" @default.
- W2551369547 modified "2023-09-27" @default.
- W2551369547 title "SOFT ORBIT BUMP FOR DUKE STORAGE RING VUV FEL OPERATION" @default.
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