铷同位素的精密标定及对精细结构常数变化的测试

项目名称： 铷同位素的精密标定及对精细结构常数变化的测试

项目编号： No.91336105

项目类型： 重大研究计划

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 魏荣

作者单位： 中国科学院上海光学精密机械研究所

项目金额： 100万元

中文摘要： 本项研究将开展铷同位素喷泉钟组的研究并且利用它测试精细结构常数α的变化。我们提出了利用两种铷同位素钟频率的相对变化测试α的变化，理论预期这是最有效的方案之一。我们将开展Rb87喷泉钟的改进研究，通过增加装载系统，改善喷泉钟稳定度指标，通过改进微波系统，抑制分布腔相移的影响，使喷泉钟的不确定度降低到1.3E-15以下，在搭建Rb85喷泉装置时，通过增加精密磁屏蔽和冷原子装载系统等手段，使该系统达到可运行精密原子钟的要求，在Rb87喷泉钟微波系统的基础上搭建Rb85喷泉的微波综合器，利用同源法实现喷泉钟组运行并显著降低钟组间的比对时间。Rb85喷泉的不确定度和钟频率测试误差将低于3E-15，钟频率的长期比较用于测试α的变化。利用共视法验证测试结果并发布高不确定度指标的喷泉钟频率信号。

中文关键词： 铷同位素；原子喷泉钟；精密测量；频率比对；不确定度评估

英文摘要： The project will research the atomic fountain clocks group of rubidium isotopes and its application on measuring the variation of α, the fine structure constant. We have pointed out that the variation can been detected by comparing related variation between two clock frequencies of the isotopes, and the idea has been proved as one of the most effective methods by theory. One part of research is improvements of a rubidium 87 atomic fountain clock, the stability will become better by adding a cold atoms loading system, and adjusting microwave system will restrict the error of distributed cavity phase, so as to reduce the total uncertainty of the clock to less than 1.3E-15. Many adjustments, such as adding a loading system of cold atoms and fine magnetic shield, are used at building of atomic fountain of rubidium 85, which will make the device run continuously with best indexes. The microwave synthesizer of atomic fountain of rubidium 85 is attached to the microwave system of rubidium 87 fountain clock, the fountain clock groups runs by the way of same source, which decreases comparing time of two fountain clocks greatly. The uncertainties of fountain clock of rubidium 85 and its measuring result of clock frequency will less than 3E-15, and the result of long-time comparing of two clocks will use to detect the vari

英文关键词： rubidium isotopes；atomic fountain clock；precision measurement；frequncy comparison；uncertainty evalution