被动型氢原子钟储存泡口原子分布计算及应用  

Calculation of atoms distribution at storage bubble entrance of passive hydrogen maser and its application

作　　者：王勇[1] 李建清[1] 邱实[1] 

机构地区：[1]东南大学仪器科学与工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2012年第1期67-71,共5页Journal of Southeast University：Natural Science Edition

基　　金：教育部国防科研培育基金资助项目(9350235006)

摘　　要：为了获得被动型氢原子钟高、低能态氢原子经四极磁选态器偏转后在储存泡口的分布规律,建立了更加贴近实际情况的分布模型.利用统计学方法,一定温度下的氢原子出射速度采用麦克斯韦分布,出射角度近似采用均匀分布,并结合氢原子在四极磁选态系统中的运动规律,通过数值计算得到了距四极磁选态器出口一定距离处高、低能态氢原子的三维分布密度.应用该分布模型,计算得到收集高能态氢原子的泡口优化半径与聚焦距离之间的关系,为储存泡的加工和聚焦距离的设计提供了依据,可以使得高能态原子被最大程度聚集,低能态原子被偏离,从而提高谐振腔内跃迁信号的功率.In order to get the distribution law of passive hydrogen maser＇s high and low energy state atoms at the storage bubble entrance after deflected by the quadrupole state selector,a distribution model much closer to practice is built up.Based on the viewpoint of statistics and the motion law of hydrogen atoms in the quadrupole state selecting system,the three-dimensional distribution density of high and low energy state atoms in the plane with a certain distance from the quadrupole state selector is figured out through numerical calculation method,in which the hydrogen atoms＇ emergence velocity distribution is regarded as Maxwell distribution under a certain temperature and the emergence angle is approximately regarded as uniform distribution.Using the distribution model,the mathematic relation between the optimum radius of the storage bubble entrance and focusing distance can be got,which can provide theory evidence for manufacturing of storage bubble and designing of focusing distance,so as to make the high-energy state atoms focused at the utmost and the low-energy state atoms dispersed.Consequently the power of transition signal in the cavity resonator can be increased.

关 键 词：被动型氢原子钟 储存泡口 三维分布密度 优化半径 聚焦距离 

分 类 号：TM935.113[电气工程—电力电子与电力传动]