NDLI: Reducing the blackbody radiation shift in the NIM new fountain design

Content Provider	IEEE Xplore Digital Library
Author	Fang Fang Kun Liu Xiaoke Yan Rui Suo Weiliang Chen Nianfeng Liu Yu Zhang Tianchu Li
Copyright Year	2013
Description	Author affiliation: Nat. Inst. of Metrol., Beijing, China (Fang Fang; Kun Liu; Xiaoke Yan; Rui Suo; Weiliang Chen; Nianfeng Liu; Tianchu Li) \|\| Beijing Inst. of Technol., Beijing, China (Yu Zhang)
Abstract	We are developing a new Cs fountain frequency standard in NIM, and shooting for the frequency uncertainty of a few parts in $10^{16}.$ The new fountain will run in a lab with the temperature fluctuation of 0.3K, and no active temperature control system will be added outside the flight tube. Instead, an isothermal liner will be surrounded the flight tube. It is a special type of heat pipe, made of a thin layer of vacuum tube filled with pure water. The thermal conductivity of a glass isothermal liner is about 10 times higher than that of coppers. It also works like a low pass filter reducing the temperature fluctuations of the system. The advantage of using an isothermal liner is to make the temperature of the whole interrogation region more uniform and stable. With precision standard Pt thermometers measuring the temperatures of a few locations of the flight tube, the average temperature uncertainty is less than 50 mK. The frequency shift due to the blackbody radiation can be calculated, and the relative frequency shift due to black body radiation can reach down to 7.2E-17 of this new fountain clock. Key words: Fountain clock, blackbody radiation, heat pipe.
Sponsorship	IEEE Ultrason., Ferroelectr., Freq. Control Soc.
Starting Page	232
Ending Page	234
File Size	482847
Page Count	3
File Format	PDF
DOI	10.1109/EFTF-IFC.2013.6702140
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-21
Publisher Place	Czech Republic
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature measurement Uncertainty Temperature Heating Electron tubes Copper Isothermal processes
Content Type	Text
Resource Type	Article

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