Energy distribution and adiabatic guiding of a solid-neon-moderated positron beam
Energy distribution and adiabatic guiding of a solid-neon-moderated positron beam
复制标题
固体氖慢化正电子束的能量分布和绝热引导
DOI：
10.1088/1361-6455/ab7642
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
S. Ghosh, J. R.
中科院分区：
文献类型：
--
作者：
S. Ghosh, J. R.
慢正电子产生的22钠源和锥形固体氖减速器和提取的磁引导束。测量的平均平行和垂直的能量和束粒子的径向分布。在7米的距离，其中的磁场B变化从0.005到0.12 T，被认为是绝热的平均能量高达50 eV的束传输。非绝热效应，证明了在垂直于B的运动中的能量增加，观察到在较大的运输能量。缓冲气体正电子陷阱和其他正电子传输光束线这些意见的影响进行了讨论。
Slow positrons are generated from a 22 Na source and cone-shaped solid neon moderator and extracted as a magnetically guided beam. Measurements are presented for the mean parallel and perpendicular energies and the radial distribution of the beam particles. Over a distance of 7 m, where the magnetic field B varies from 0.005 to 0.12 T, the beam transport is found to be adiabatic for mean energies up to 50 eV. Non-adiabatic effects, evidenced by an increase in energy in motion perpendicular to B, are observed at larger transport energies. The implications of these observations for buffer-gas positron traps and other positron-transport beamlines are discussed.