Design of a high-current, low-emittance electrostatic electron gun for the Iranian Light Source Facility's electron preinjector, and investigation of its electron beam dynamics

• Hossein Rafiei (Isfahan University of Technology & IPM)

The pre-injector of the Iranian Light Source Facility consists of a radiofrequency electron gun, longitudinal and transverse focusing magnets, linear accelerators, and several other ancillary parts. Since the emittance of the ILSF electron beam at the end of the linear accelerators reaches about 8 mm-mrad, we intend to achieve a lower emittance by designing an electrostatic electron gun. Also, electrostatic electron gun pre-injectors do not require alpha magnets and instead have several beam bunchers, contributing to this type's lower emittance. Reducing the emittance in the electron pre-injector does not have much effect on reducing the emittance in the storage ring. However, the more we can minimize the beam emittance at the beginning of its production, the better. Because the beam emittance may gradually increase along the path. Reducing the emittance of the pre-injector leads to a reduction in the dimensions of the vacuum chamber and the opening of the magnets in the booster ring, and reduces the cost of the magnets and their energy consumption. In this study, we try to design a high-current electrostatic electron gun with low emittance and investigate the electron beam dynamics and beam emittance with the SPIFFE code and GPT code.