The behaviour of positron clouds in the single-particle regime under the influence of rotating wall electric fields
The behaviour of positron clouds in the single-particle regime under the influence of rotating wall electric fields
复制标题
旋转壁电场影响下单粒子态正电子云的行为
DOI：
10.1088/1367-2630/14/7/075022
复制
发表时间：
2012
影响因子：
3.3
通讯作者：
M. Charlton
中科院分区：
文献类型：
--
作者：
D. P. van der Werf;C. A. Isaac;C. J. Baker;T. Mortensen;S. J. Kerrigan;M. Charlton
正电子云的压缩后，积累在一个苏尔科型的两级缓冲气体阱使用非对称旋转壁电场。分析理论用于描述的压缩率的测量进行了讨论。此外，我们描述的测量没有旋转壁的应用和旋转壁的压缩过程中存在的正电子云的积累。这使得正电子通过湮灭和碰撞引起的径向传输的总损失率被隔离，后一种机制被发现是占主导地位的。我们已经表明，在共振频率的旋转壁的应用程序实际上消除了径向传输，这样的正电子损失所造成的气体中的湮灭。
Positron clouds are compressed following accumulation in a Surko-type two-stage buffer gas trap using an asymmetric rotating wall electric field. An analytic theory used to describe measurements of the rate of compression is discussed. Furthermore, we describe measurements taken without the rotating wall applied and with the rotating wall compression present during accumulation of the positron cloud. This has enabled total loss rates for the positrons via annihilation and collisional-induced radial transport to be isolated, with the latter mechanism found to be dominant. We have shown that the application of the rotating wall at a resonant frequency virtually eliminates radial transport, such that the positron loss is caused by annihilation in the gas.