一、引言 中性束注入器是要把离子源引出的高能离子转化成高能中性粒子,并输送到聚变装置中,既要提供足够的气体靶厚,以获得高效率的中性化,又要求主真空箱内的气压不超过一定的压强值,以减少再电离损失和对装置的气体负载。对于2MW这样特大的注入器,在设计过程中,不仅力图获得最大传输效率,而且要考虑到工程上的可行性和经济效益。因此,通过对抽气过程的分析计算来优化选择注入器进气方式、真空及抽气系统的各参数是必要的。 I. INTRODUCTION Neutral beam injector is to convert the high-energy ions from the ion source into high-energy neutral particles and transport them to the fusion device. It is necessary to provide enough gas target thickness to obtain high efficiency of neutralization. It is required that the pressure inside the main vacuum box does not exceed a certain pressure value to reduce the reionization loss and the gas load on the device. For such a large 2 MW injector, in the design process, not only to maximize the transmission efficiency, but also to take into account the engineering feasibility and economic benefits. Therefore, through the analysis and calculation of the extraction process to optimize the choice of injector intake mode, vacuum and exhaust system parameters are necessary.