Three-dimensional numerical simulation on 15∼20 mA H^- cusp source

The self-developed 3D PIC/MCC algorithm is described, including the algorithm flow design, collision treatment mechanism and so on. The numerical simulation of the 15∼20 mA H^- cusp source developed by the China Institute of Atomic Energy is researched with this algorithm. The results show that H^- cusp source can produce ion beams that uniformly distribute in objective space. Using the optimized virtual filtering field can effectively filter high-energy electrons and lead to the low-energy electron in the ion source downstream region to increase. The negative hydrogen ions volume generation efficiency is improved effectively. (authors)