离子源是医用小型回旋加速器核心装置之一,要求结构简单紧凑,能引出3mA的H-离子束。经调研后最终采用外部负氢多峰场离子源,并对其进行了结构设计。紧凑型离子源(图1)主要由主绝缘座、三电极结构、等离子腔体、灯丝构成。1主绝缘座主绝缘座起到使离子源与地之间绝缘的作用,防止打火,可耐压30kV,材料采用聚甲醛。2三电极结构 The ion source is one of the core medical cyclotron devices and requires a simple and compact structure that draws 3-mA H-ion beams. After the investigation, the external negative hydrogen multimodal field ion source was finally adopted and the structure design was carried out. Compact ion source (Figure 1) mainly by the main insulation seat, three electrode structure, plasma chamber, filament composition. A main insulation base The main insulation base to play the role of ion source and the ground between the insulation to prevent ignition, can withstand 30kV, the material uses polyacetal. 2 three electrode structure