Formation of Buffer-Gas-Trap Based Positron Beams
Formation of Buffer-Gas-Trap Based Positron Beams
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基于缓冲气阱的正电子束的形成
DOI：
10.1063/1.4913354
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
C. Surko
中科院分区：
文献类型：
--
作者：
M. R. Natisin;J. Danielson;C. Surko
本文给出了用Penning-Malmberg型缓冲气体阱形成的脉冲磁导正电子束的实验测量、解析表达式和模拟结果。在相应的极限条件下，粒子运动可分为沿磁场沿着运动和垂直于磁场平面内的回转运动。解析表达式的发展描述的光束能量分布的演变，平行和垂直的磁场，作为光束传播通过区域的变化磁场。模拟的光束形成过程中，选择的参数，以准确地复制实验条件。在实验和模拟中，初始条件和喷射参数系统地变化，从而可以探索束形成中涉及的相关过程。这些研究提供了新的见解的基础物理，包括显着的绝热冷却，由于时间依赖的光束格式…
Presented here are experimental measurements, analytic expressions, and simulation results for pulsed, magnetically guided positron beams formed using a Penning-Malmberg style buffer gas trap. In the relevant limit, particle motion can be separated into motion along the magnetic field and gyro-motion in the plane perpendicular to the field. Analytic expressions are developed which describe the evolution of the beam energy distributions, both parallel and perpendicular to the magnetic field, as the beam propagates through regions of varying magnetic field. Simulations of the beam formation process are presented, with the parameters chosen to accurately replicate experimental conditions. The initial conditions and ejection parameters are varied systematically in both experiment and simulation, allowing the relevant processes involved in beam formation to be explored. These studies provide new insights into the underlying physics, including significant adiabatic cooling, due to the time-dependent beam-format...