Minimizing plasma temperature for antimatter mixing experiments
Minimizing plasma temperature for antimatter mixing experiments
复制标题
最小化反物质混合实验的等离子体温度
DOI：
10.1051/epjconf/202226201007
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发表时间：
2022
影响因子：
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通讯作者：
Hunter E.D. et al.
中科院分区：
文献类型：
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作者：
Hunter E.D. et al.
ASACUSA的合作产生了一束反氢原子，通过在强磁场中混合纯正电子和反质子等离子体，具有双尖点几何形状。正电子在低温阱中通过回旋辐射冷却。低的正电子温度对于增加反氢原子在离开陷阱之前达到基态的比例是必不可少的。许多实验小组观察到，这种等离子体在远高于周围电极温度的温度下达到平衡。这个问题通常归因于电子噪声和等离子体膨胀，其加热等离子体。目前的工作报告异常加热远远超出了什么可以归因于这两个来源。加热似乎是一个结果的轴向开放的陷阱的几何形状，它耦合等离子体的外部（300 K）环境，通过微波辐射。
The ASACUSA collaboration produces a beam of antihydrogen atoms by mixing pure positron and antiproton plasmas in a strong magnetic field with a double cusp geometry. The positrons cool via cyclotron radiation inside the cryogenic trap. Low positron temperature is essential for increasing the fraction of antihydrogen atoms which reach the ground state prior to exiting the trap. Many experimental groups observe that such plasmas reach equilibrium at a temperature well above the temperature of the surrounding electrodes. This problem is typically attributed to electronic noise and plasma expansion, which heat the plasma. The present work reports anomalous heating far beyond what can be attributed to those two sources. The heating seems to be a result of the axially open trap geometry, which couples the plasma to the external (300 K) environment via microwave radiation.