The JAEA 10A multi-cusp source discharge is simulated by the self-developed full 3D PIC/MCC software. The influence of the electrode layout on H? volume generation efficiency was analyzed. The simulation shows that with a certain discharging power, the crosswise drifting from high energy electrons will weaken relatively when the number of electrodes decreases, then the uniform H? beam will be obtained. However, the lower electrodes lead to a lower generation efficiency of the H? volume. When the electrodes are close to magnetic filtering region, the crosswise drifting will be strengthen relatively and the H? volume generation efficiency is quite low. With changing the number of electrodes, the high H? volume generation efficiency and the good space uniformity couldn't be obtained together. The electrodes far away from magnetic filtering region are the best choice.%采用自主研发的全三维PIC/MCC软件对JAEA 10A多峰负氢离子源进行系统仿真,分析了电极布局对H?体积产生效率的影响.模拟结果显示:放电功率一定的情况下,增加电极数目,高能电子导致的横向漂移相对减弱,进而得到相对均匀的H?束;但电子的相对利用率越低,导致H?体积产生效率较低.电极越靠近过滤磁区,高能电子导致的横向漂移相对增强,H?体积产生效率较低.改变电极数量,H?体积产生效率和空间均匀性不可兼得,电极远离磁过滤区,可实现双赢.
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