Design of a trial undulator applied in THz radiation source

The undulator is the key component in the THz radiation source based on FEL. According to the theory,we proposed the basic requirements of the undulator. We will create a trial undulator in order to verify the feasibility of these requirements, and accumulate the experience. With the use of the finite element calculation software OPERA3D,we modify the structural parameters of the undulator gradually to meet the requirements of the peak,width of the good field and first integration. We also prove that the correction magnet could make the field meet the requirement of the second integration.