Abstarct: There are different types of ion sources, one of the most important of which is the multi-cusp ion source. The multi-cusp ion source is a high-current ion source named for the arrangement of its magnets. Multi-cusp ion sources have numerous applications in various fields such as particle accelerators, ion implantation, and sputtering. In this thesis, the design, simulation, and construction of a cold cathode multi-cusp ion source are explained. First, the physical principles, structure, and function of this ion source are investigated. baxsed on simulations done using CST software, two types of arrangements cubic and cylindrical are examined, followed by a detailed explanation of the design and construction steps of the ion source. Key parameters such as the intensity of the magnetic field created inside the source, electron and proton confinement, emittance, and extracted current with changes in the number and arrangement of ion source magnets are among the most important simulation and practical results obtained. The simulation and experimental results show that, at a distance of 9.5 cm from the ionization chamber, an arrangement of eight magnets yields the highest current in the simulation, and in experiments, the cubic arrangement of eight magnets produces the highest output current. Additionally, the effect of the magnetic filter on the output current and the experimental results were investigated. This study enhances the understanding of multi-cusp ion sources and provides practical insights to optimize their design and performance. .