Abstract
We achieved the generation of narrowband X-ray beams by inverse Compton scattering using stored spontaneous emission and electron bunches in the infrared free-electron laser system of the storage ring NIJI-IV. Using stored spontaneous emission with a resonant wavelength of 1530 nm and an electron beam with an energy of 310 MeV, an X-ray beam with the energy spread of approximately 10% and the Compton edge of 1.2 MeV was observed using a LaBr3(Ce) scintillation detector in the 3-bunch operation. X-ray beams were generated by inverse Compton scattering using stored spontaneous emission in the full-bunch (16-bunch) operation, and an increase in the bunch number is shown to be effective for increasing the Compton X-ray yield. The total yield of the Compton X-ray beam reached 3.1 × 104 photons/s at the electron-beam current of 43.5 mA in the full-bunch operation. These experimental results are likely to be useful for the development of narrowband X-ray beams with energies above 1 MeV, for use in energy recovery linacs and third-generation storage rings.
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