偏压电荷收集器测量HPIB的原理和实验  

Theory and experimental study of biased charge collector for measuring HPIB

作　　者：何小平[1] 李洪玉[2] 王海洋[1] 孙剑锋[1] 杨海亮[1] 邱爱慈[1] 汤俊萍[1] 李静雅[1] 

机构地区：[1]西北核技术研究所,西安710024 [2]西安交通大学电气工程学院,西安710049

出　　处：《核技术》2004年第1期43-47,共5页Nuclear Techniques

基　　金：国家自然科学基金(19975037)资助课题

摘　　要：介绍了偏压电荷收集器的结构,分析了利用其测量HPIB束流强度的原理,利用KARAT PIC软件模拟了偏压电荷收集器内部的电荷输运过程,模拟结果表明HPIB在偏压电荷收集器内部电荷中和而电流不中和,从而证实了电荷中和假设和这种装置测量HPIB的准确性。另外还分别对几何参数和偏置电压对偏压电荷收集器的影响进行了模拟,在德拜长度范围内,孔径的大小为0.6-0.8 mm比较合适,偏压为-800 V就可满足峰值能量为500keV HPIB的测量要求,实验验证了偏压大小与离子收集效率之间的关系。Structure of the biased charge collector for measuring HPIB is introduced in this paper. The inner charge propagation process of HPIB in the biased charge collector was simulated with KARAT PIC code. The simulation results indicated that charge was neutralized but current was not neutralized in the biased charge collector. The influence of biased voltage and aperture diameter were also simulated. A -800 V biased voltage can meet the requirement for measuring 500 keV HPIB, and this is consistent with the experimental results.

关 键 词：偏压电荷收集器 高功率离子束 KARAT软件 

分 类 号：TL81[核科学技术—核技术及应用] TL506