摘要
研究了重离子加速器中束流与真空中剩余气体的碰撞损失过程和碰撞截面，在依据大量实验数据的基础上，提出了一组计算离子一原子的电荷交换截面的经验公式，以兰州重离子加速器ＨＤＲＦＬ及冷却储存环ＣＳＲ为例，给出了依据碰撞截面的公式计算束流在加速器真空中的传输效率的方法，并计算了在不同真空度下ＨＩＲＦＬ的ＥＣＲ源轴向注入束运线、注入器ＳＦＣ、前束运线、主加速器ＳＳＣ和后束运线等不同加速阶段及ＣＳＲ的传输效率，并提出合理的真空度要求。ＨＩＲＦＬ的真空分布测量和束流的损失测量证明了该计算方法的可靠性。
This paper discusses the collision of heavy ions with residual gas atoms in the vacuum and the cross-sections of the collision processes. Tlhe method calculating beam transmission efficiency in vacuum is presented taking HIRFL and CSR machine as examples. Based on rich experimental data a series of empirical formulae of calculating the cross-section of charge changing process is given. The transmission efficiency curvcs of different sections in HIRFL and CSR are also calculated, and thus the reasonable requirements for HIRFl and CSR vacuum systems ue given. The calculation method has been checked by the measurements of vacuum and beam loss in HIRFL.
出处
《高能物理与核物理》
EI
CSCD
北大核心
1998年第8期745-754,共10页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
关键词
重离子加速器
束流
碰撞
真空中剩余气体
electron capture, electron loss, charge changing cross-section, residual gas in vacuum, transmission efficiency
