利用电子回旋共振放电提高氢原子制备效率方法研究

Study on the Method of Using ECR Discharge to Improve the Efficiency of Hydrogen Atom Preparation

基态氢原子的制备是氢原子钟工作的基础,提高氢原子的生成率极为重要.针对电离泡内氢等离子体中的原子成分不易直接被探测的情况,本文将软件仿真模拟与实验光谱诊断相结合,研究泡内原子成分.采用COMSOL软件建立射频感应耦合等离子体(ICP)和微波电子回旋共振(ECR)两种放电模型,模拟了一定输入功率、不同气压下氢等离子体中原子密度的分布规律.根据仿真模型,使用ICP和ECR两种电离源在通氢的石英制电离泡内形成等离子体,测量了一定输入功率、不同气压下的辐射光谱强度.结果表明,15 W输入功率、8 Pa~14 Pa气压时,微波ECR放电产生的原子密度明显高于射频ICP放电,可知此时微波ECR放电能更高效地产生氢原子.该研究显示出微波ECR放电在氢原子钟上的应用前景.

The preparation of ground-state hydrogen atoms is the basis of the operation of hydrogen maser,and it is very important to increase the generation rate of hydrogen atoms.Because the atomic composition in the hydrogen plasma of the ionization bubble is not easy to be detected directly,this paper combines software simulation and experimental spectrum diagnosis to study the atomic composition in the bulb.The COMSOL software was used to establish two discharge models of RF ICP and microwave ECR,and the distribution of atomic density in hydrogen plasma under certain input power and different pressure was simulated.Compared with the simulation model,RF ICP and microwave ECR dissociator were used to generate plasma in a quartz discharge bulb with hydrogen,and the radiation spectrum intensity under a certain input power and different pressures was measured.The results show that when the input power is 15 W and the pressure is 8 Pa~14 Pa,the atomic density generated by microwave ECR discharge is significantly higher than that of RF ICP discharge.It can be seen that microwave ECR discharge can produce hydrogen atoms more efficiently under the above conditions.This research shows the application prospect of microwave ECR discharge in the hydrogen maser.