Monte Carlo simulation for properties of SPIG in poor vacuum

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Monte Carlo simulation for properties of SPIG in poor vacuum

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- Monte Carlo simulation for properties of SPIG in poor vacuum
- NUCLEAR TECHNIQUES Issue 9, (1995)
- 作者机构：
  
  1. 中国科学院上海原子核研究所
  2. 复旦大学李政道物理学综合实验室
  3. 日本国东京大学原子核研究所
  4. 中国科学院上海原子核研究所复旦大学李政道物理学综合实验室日本国东京大学原子核研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC： TL6
- Published：01 September 1995
- 稿件说明：
移动端阅览
[1]徐洪杰,和田道治,片山一郎.低真空中SPIG性能的蒙特卡罗模拟研究[J].核技术,1995(09):513-521.

Monte Carlo simulation for properties of SPIG in poor vacuum[J]. Nuclear techniques, 1995, (9).
[1]徐洪杰,和田道治,片山一郎.低真空中SPIG性能的蒙特卡罗模拟研究[J].核技术,1995(09):513-521. DOI：

Monte Carlo simulation for properties of SPIG in poor vacuum[J]. Nuclear techniques, 1995, (9). DOI：

摘要

应用蒙特卡罗技术对低真空中六极离子导向器（简称ＳＰＩＧ）的性能进行了计算机模拟研究．模拟计算跟踪每个离子的轨迹直至它逃离感兴趣的区域或达到终点．离子在低真空六极射频电场中受到来自电场和剩余气体两方面的作用力，这两个力对离子的运动影响在模拟中分开计算．前者用龙格－库塔（Ｒｕｎｇｅ－Ｋｕｔｔａ）方法求解运动微分方程，后者体现为离子与气体分子之间的两体碰撞，ＲＳ模型和ＭＳＷ模型用于计算碰撞过程．并对两个模型的优劣进行了比较和讨论．模拟计算得到下述结果：传输效率大于９５％，ＳＰＩＧ输出的离子束流的能量弥散小于１．０ｅＶ。束流的空间弥散小于１ｍｍ，以及离子在ＳＰＩＧ中的快速冷却效应．结果显示了ＳＰＩＧ在低真空条件下是一种有效的离子传输、聚焦和冷却方法．实验研究证实了上述的大部分计算结果．对上述蒙特卡罗模拟研究中所涉及的物理原理、计算方法以及对物理问题所作的近似和简化也进行了详细的讨论。

Abstract

The properties of the SPIG （Sextupole lon Guide） have been computationally simulated by use of Monte Carlo techniques. The trajectory of each individual ion is traced step by step until it either escapes from the SPIC or reaches the end. The effects of RF electric field and helium flow field on the ions are calculated separately.Tile former is determined by solving the differential equations with the Runge-Kutta method and the latter is known by considering collisions between the ions and gas molecules by use of the RS model or MSW model. A comparison of the two models has been made.The simulation results show that the transmitted efficiency of the ions throughout the SPIG is higher than 95%

width of the kinetic energy distribution and size of the spatial distribution in the plane perpendicular to the symmetry axis after the SPIG are less than 1.0eV and 1mm respectively

and the ions moving in the SPIG are rapidly cooled. Most of the calculated results agree with the experimental results very well. The physical principle

calculation method and approximation used in the simulation have been discussed.

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