ve hydrogen ion source can be accurately solved by this algorithm. 2. The combination of Particle-in-Cell (PIC) method and Monte Carlo Collision (MCC) method is implemented on the CHIPIC software platform, creating a 3D PIC/MCC algorithm specifically for simulating negative hydrogen ion sources. This allows for the study of particle behavior and collision dynamics within the ion source. 3. The simulation using the 3D PIC/MCC algorithm is first applied to the JAERI 10A ion source, revealing that the non-uniform distribution of electrons is related to the multi-cusp magnetic field configuration in the extraction region. Two special magnetic field shapes, External and Tent, are investigated for their impact on electron confinement and negative hydrogen ion extraction. Both shapes show effective particle confinement and negative ion filtering, with the External shape demonstrating stronger particle constraining ability and higher particle yield, while the Tent shape suppresses electron drift due to magnetic field inhomogeneity, leading to more uniform negative hydrogen ion spatial distribution. 4. Further simulations using the 3D PIC/MCC algorithm explore the discharge mechanisms of two types of J-PARC ion sources. The volume production efficiency is found to be closely tied to the position of the correction magnets. The first type of J-PARC ion source shows a uniform spatial distribution, indicating a high volume production efficiency without the need for surface production mechanisms, simplifying design and reducing costs. In contrast, the second type is more sensitive to the correction magnet positioning, significantly affecting its volume production efficiency.
本研究通过三维PIC/MCC算法对多峰负氢离子源进行了深入的数值模拟，揭示了磁场配置、电子分布、离子源结构以及校正磁体位置等因素对负氢离子产生和分布的影响。这些发现对于优化离子源设计、提高负氢离子束的均匀性和效率具有重要意义，为未来等离子体受控热核聚变研究中的中性束注入技术提供了理论依据和参考。关键词：多峰磁场，负氢离子源，粒子模拟，蒙特卡罗碰撞，均匀性。
