Simulation study of coherent high harmonic generation on NIJI-VI storage ring

In this paper, three kinds of experimental designs to generate coherent high harmonic waves were discussed for the NIJI-VI storage ring, and the feasibility of these methods were analyzed to find the optimal experimental design. Especially when the second undulator magnetic field period keeps constant and only its gap was changed for its resonant wavelength equal to the third harmonic wavelength of the first undulator, the coherent emitting intensity of the optical klystron can be improved under some conditions.