Improvements and New Evaluation of NIM4 Caesium Fountain Clock at NIM in 2005-2006

作     者：李天初 李明寿 林平卫 王平 陈伟亮 刘年丰 林戈戈 

作者机构：National Institute of Metrology (NIM) Beijing 100013 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2007年第24卷第5期

页      面：1177-1179页

核心收录：

学科分类：07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

主　　题：Improvements Evaluation Fountain 

摘      要：The NIM4 caesium fountain clock has been operating stably and sub-continually since August 2003. We present our improvements on NIM4 in 2005-06 and the most recent evaluation for its frequency shifts with an uncertainty of 5 × 10^-15. A 203-day comparison between NIM4 and GPS time shows an agreement of 2 × 10^-14. Finally the construction of the NIM5 transportable caesium fountain clock is briefly reported.