Effects of Design Parameters on Magnetic Fields Generated by Synchrotron Undulator

Abstract

Magnetic fields from a planar undulator for a synchrotron source are simulated by using Radia program. The undulator consists of 4 arrays of permanent magnets. Each array has 41 bars of magnet whose remanent magnetization is perpendicular to the adjacent one. The simulated magnetic field is periodic and dependent on configuration of the magnets including the gap and the magnetic period length. Magnetic field can be adjusted by translating an array of magnet relative to each other. The variation of this field with the translation is symmetric with respect to its direction. By the calculation of the force from the simulated magnetic field, the zig-zag electron trajectory in the horizontal plane is obtained and leads to the synchrotron radiation.