An ensemble of low-energy positrons injected into a supported magnetic dipole trap can remain trapped for more than a second. Trapping experiments with and without a positive magnet bias yield confinement times up to $\tau_A=(1.5\pm0.1)\,$s and $\tau_B=(0.28\pm0.04)\,$s, respectively. Supported by single-particle simulations, we conclude that the dominant mechanism limiting the confinement in this trap is scattering off of neutrals, which can lead to both radial transport and parallel losses onto the magnet surface. These results provide encouragement for plans to confine an electron-positron plasma in a levitated dipole trap.

中文翻译：

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在支持的磁偶极子阱中正电子的局限超过一秒

注入到支持的磁偶极子阱中的低能正电子的集合可以保持被俘获的时间超过一秒钟。具有和不具有正磁体偏置的陷波实验的收束时间分别高达$ \ tau_A =（1.5 \ pm0.1）\，$ s和$ \ tau_B =（0.28 \ pm0.04）\，$ s。在单粒子模拟的支持下，我们得出结论，限制该陷阱限制的主要机制是中性粒子的散射，这可能导致径向传输和在磁体表面上的平行损耗。这些结果为将电子-正电子等离子体限制在悬浮偶极阱中的计划提供了鼓励。