摘要
根据离子束生物工程的需要 ,设计和研制了一台用于静电加速器的小型高频离子源。针对使用环境从理论上确定了离子源的结构和尺寸。通过实验调试取得了引出束流与引出电压、聚焦电压以及放电气压之间的变化特性曲线 ,测定了引出束流的束径包络 ,对束流的不稳定性进行了分析 ,在设计中采取了有效的措施抑制束流不稳定性。结果表明 ,离子源的最佳工作条件为引出电压 1 60 0～ 1 80 0 V,放电气压在 ( 4～ 8)× 1 0 -4 Pa范围 ,此时离子源可引出最大束流 3 0 μA。束流大小及其稳定性均达到预期要求。
RF-driven ion source has been developed for the ion beam bioengineering. As used in an electrostatic accelerator, the ion source was specially designed considering the structure, weight and the power supplies. The size of the extracting electrode was calculated in detail. The extracting beam characteristics of the ion source depending on extracting voltage, focusing voltage and gas pressure were obtained by experiments. The variation of the beam radius along the axis was measured. Factors producing the beam instability were generally discussed, and effective techniques were used to reduce the beam instability. Experimental results show that the extracting characteristics agree well with the theoretical expectation. The maximum beam current was obtained when the extracting voltage was 1600-1800 V and the gas pressure was (4-8)×10-4 Pa. The diverging angle of the beam was 4-7° at different measuring points, which well satisfies the requirement of ion beam bioengineering.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2001年第4期498-502,共5页
High Power Laser and Particle Beams
基金
国家"九五"攻关项目资助课题 ( 96-5 3 8)
