| 题名 | 磁势阱中的参量冷却和射频场导引 |
| 作者 | 张海潮 |
| 学位类别 | 博士 |
| 答辩日期 | 2005 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 王育竹 |
| 关键词 | 参量冷却，导引，相干原子束 |
| 其他题名 | Parametric Cooling of Neutral Atoms in a NTagnetic Trap and Their Guiding with Radio-frequency Field |
| 中文摘要 | 本报告主要探讨了两类交流势阱的意义、原理和实验前期工作。一类是对磁陷阱的低频调，用于冷却目的。另一类是高频势阱，用于导引不同状态的原子。把位置选择性参量冷却和轴向非均匀的射频导引构型集成到原子芯片上，有可能产生相干原子束输出，形成原子激射器。 |
| 英文摘要 | This paper consists of two parts: 1.Parametric cooling of neutral atoms in a magnetic trap; 2. A radio-frequency(guide for neutral atoms and an atom-laser with rf field. The new method of parametric cooling of neutral atoms in a magnetic trap refers to the anisotropic modulation of the depths and shapes of the magnetic trip by the low frequency oscillation. Owing to the anharmonicity of the trap potential, high-energy atoms can be removed selectively from the magnetic trap. It seems that this cooling will work well when the temperature of the atom cloud is much lower than the trap depth, because one can chirp the frequency of the parametric field from higher value to lower one, and then it is possible to remove energetic atoms out of the deep trap and cool the remaining atom cloud further. Because the Pauli xclusion principle suppresses elastic collisions between identical Fermions at very low temperatures, evaporative cooling is inefficient in the case of cooing of Fermionic atoms. However, when a parametric field imposes anisotropically on the Fermi gas, the Pauli blocking effect can be lowered. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15784]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 张海潮. 磁势阱中的参量冷却和射频场导引[D]. 中国科学院上海光学精密机械研究所. 2005. |
| 个性服务 |
| 查看访问统计 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论