Compression of positron clouds in the independent particle regime.
Compression of positron clouds in the independent particle regime.
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独立粒子状态下正电子云的压缩。
DOI：
10.1103/physrevlett.107.033201
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发表时间：
2011
影响因子：
8.6
通讯作者：
M. Charlton
中科院分区：
文献类型：
--
作者：
C. A. Isaac;C. J. Baker;T. Mortensen;D. P. van der Werf;M. Charlton
在提供冷却的低压分子气体存在的情况下，应用以接近捕获正电子集合轴向反弹频率旋转的不对称偶极电场来实现云的压缩。这种效应的理论已经发展为彭宁陷阱势，冷却模型在斯托克斯粘性阻力近似。云压缩率的频率依赖性的理论和测量结果很好地吻合，确定了这种现象是边带冷却的一种新形式。
The application of an asymmetric dipolar electric field rotating at a frequency close to that of the axial bounce of a collection of trapped positrons has, in the presence of a low pressure molecular gas to provide cooling, been used to achieve compression of the cloud. A theory of this effect has been developed for a Penning trap potential, with the cooling modeled in the Stokes viscous drag approximation. Good agreement between the theory and measurements of the frequency dependence of the cloud compression rate has been found, establishing that the phenomenon is a new form of sideband cooling.