一种磁聚焦型带电粒子三维动量信息映射技术

A Technique of Magnetic Focusing Type Charged-particle Three-dimensional Momentum Mapping

提出了一种高收集效率带电粒子三维动量映射分析技术,其特点在于:引入轴向均匀磁场以约束抑制带电粒子在系统横向的发散,使得分析仪具有较大的粒子收集角;采用位置敏感探测器记录带电粒子撞击探测器的位置信息和时间信息,用以反演重建带电粒子的初始动量。文中根据带电粒子在磁场的运动方程,阐述了该技术的工作技术原理,给出了带电粒子初始三维动量与位置及时间信息的映射重建关系;同时也说明该技术相对无磁场映射技术在粒子收集率方面的优越性。另外,文中也从该技术后续工程应用的角度,给出了磁场的优化设置问题。

A charged-particle three-dimensional momentum mapping analyzer is proposed in this paper. The characteristics are as follows. An axial uniform magnetic field is introduced to constraint the lateral divergence of the charged particles in the system, thus making an analyzer have a comparatively larger angle of particles collection. Position-sensitive detector （PSD） serves as the charged particle receiver, recording both the position and time information of the charged particles. Based on the motion equation of electron in magnetic field, the operating principle is analyzed, and the mapping reconstruction relation among the initial three-dimensional momentum information and the position and time information of the charged particles on the detector is given. The superiority over the magnetic-field-free technique is also discussed, and simultaneously the optimum setting of the introduced axial magnetic field is given.