海上浮标新型原子钟磁光阱数值模拟和参数优化  

Numerical simulation and parameter optimization of novel atomic clock magneto-optical trap for offshore buoys

作　　者：李嘉昕 陈海军[1] 冯进军[1] 吴启航 LI Jiaxin;CHEN Haijun;FENG Jinjun;WU Qihang(National Key Laboratory of Science and Technology on Vacuum Electronics,Beijing Vacuum Electronics Research Institute,Beijing 100015,China;Merchant Marine College,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]北京真空电子技术研究所大功率微波电真空器件技术国家级重点实验室,北京100015 [2]上海海事大学商船学院,上海201306

出　　处：《上海海事大学学报》2023年第1期24-29,共6页Journal of Shanghai Maritime University

摘　　要：为了实现长时间实时采集并实时传输特定海域的海洋环境噪声、温度和深度等信息,需要提高浮标电子舱中原子钟自主守时的能力。本文基于蒙特卡洛方法对纵向冷却与推射分离的二维磁光阱(two-dimensinal magneto-optical trap with hollow cooling and pushing,2D-HP MOT)产生冷铯原子束的过程进行数值模拟。选取1×10^(8)个均匀分布且速度满足麦克斯韦-玻尔兹曼分布的原子,利用龙格-库塔法求解铯原子的运动方程,得到原子束通量和磁光阱系统各项参数的关系。对磁场梯度、蒸气压、横向冷却光、中空光的相关参数进行优化。模拟结果显示优化后的原子束通量达到3.1×10^(11)个/s。该方法能够方便快捷地优化2D-HP MOT系统的参数,为新型浮标的工程化设计提供理论指导。To realize the long-time real-time collection and real-time transmission of marine environmental noise,temperature and depth information in specific sea areas,it is necessary to improve the punctuality of the buoy electronic cabin’s atomic clock.Based on Monte Carlo method,the process of generating a cold cesium atomic beam by a two-dimensional magneto-optical trap with hollow cooling and pushing(2D-HP MOT)is numerically simulated.The hundred million uniformly distributed atoms with velocities satisfying the Maxwell-Boltzmann distribution are selected,and the equations of motion of the cesium atoms are solved by the Runge-Kutta method to obtain the relationships between the atomic flux and the parameters of the magneto-optical trap system.The parameters related to the magnetic field gradient,vapor pressure,transversely cooling beam,and hollow beam are optimized.The simulation results show that the optimized atomic flux reaches 3.1×10^(11) atoms/s.This method can conveniently and quickly optimize the parameters of the 2D-HP MOT system and provide theoretical guidance for engineering design of new buoys.

关 键 词：浮标 磁光阱 铯原子 冷原子束 

分 类 号：U644.433[交通运输工程—船舶及航道工程]