Simulation of electron trajectory in bulk HTSC staggered array undulator

To realize short-period high-magnetic-field undulator, we have proposed an undulator using bulk high temperature superconductor in a staggered array structure. To investigate the effect of the longitudinal solenoid field on the electron beam trajectory and find out the optimum value of the solenoid field, the magnetic field near the center of this undulator was modeled and the trajectory of the single electron was calculated. As a result, we found that the stronger solenoid field worked as a stronger convergence force. However, the optimum value was not able to be determined by the result of trajectory calculation because the stronger field changes the spectrum of the radiation from the beam. (author)