%0 Journal Article
%T Improvements and New Evaluation of NIM4 Caesium Fountain Clock at NIM in 2005--2006<br>Improvements and New Evaluation of NIM4 Caesium Fountain Clock at NIM in 2005-2006
%A LI Tian-Chu
%A LI Ming-Shou
%A LIN Ping-Wei
%A WANG Ping
%A CHEN Wei-Liang
%A LIU Nian-Feng
%A LIN Yi-Ge
%A <br>李天初
%A 李明寿
%A 林平卫
%A 王平
%A 陈伟亮
%A 刘年丰
%A 林戈戈
%J 中国物理快报
%D 2007
%I 
%X 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.
%K 06
%K 30
%K Ft
%K 43
%K 58
%K Hp<br>NIM4
%K 铯
%K 喷泉时钟
%K 评估
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=E27DA92E19FE279A273627875A70D74D&aid=A6F1F92187EC7BB83030066217DE03A3&yid=A732AF04DDA03BB3&vid=B91E8C6D6FE990DB&iid=94C357A881DFC066&sid=A60ED5C9472B8BEB&eid=4206C58D935377EA&journal_id=0256-307X&journal_name=中国物理快报&referenced_num=0&reference_num=0