Compression of trapped positrons in a single particle regime by a rotating electric field
Compression of trapped positrons in a single particle regime by a rotating electric field
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通过旋转电场压缩单粒子状态中捕获的正电子
DOI：
10.1063/1.2956335
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发表时间：
2008
影响因子：
2.2
通讯作者：
J. Moxom
中科院分区：
文献类型：
--
作者：
R. G. Greaves;J. Moxom
正电子被限制在一个圆柱形的潘宁阱中，通过施加一个旋转电场而被径向压缩。以前的实验是用大量处于等离子体状态的正电子进行的。本文首次报道了单粒子体系中少量正电子的压缩。对于所施加的射频振幅的低值，压缩发生在以轴向反弹频率为中心的窄频带中。对于较大的振幅，压缩延伸到弹跳频率以下的宽频率范围。在某些条件下，可以获得非常快速的压缩，并且已经观察到中心密度倍增时间仅为几毫秒。可能的模型的效果进行了讨论。描述了在产生亮度增强正电子束中的潜在应用。
Positrons confined in a cylindrical Penning trap are compressed radially by applying a rotating electric field. Previous experiments were conducted with large numbers of positrons in the plasma state. Compression of small numbers of positrons in the single particle regime is reported for the first time. For low values of applied rf amplitude, the compression occurs in a narrow band of frequencies centered on the axial bounce frequency. For larger amplitudes, the compression extends to a broad range of frequencies below the bounce frequency. Under certain conditions, very rapid compression can be obtained and central density doubling times of only a few milliseconds have been observed. Possible models for the effect are discussed. Potential application to the production of brightness enhanced positron beams is described.