scholarly journals Experimental Evaluation of the Blackbody Radiation Shift in the Cesium Atomic Fountain Clock

2022 ◽  
Vol 12 (1) ◽  
pp. 510
Author(s):  
Fan Yang ◽  
Xinliang Wang ◽  
Jun Ruan ◽  
Junru Shi ◽  
Sichen Fan ◽  
...  

The cesium atomic fountain clock is the world’s most accurate microwave atomic clock. The uncertainty of blackbody radiation (BBR) shift accounts for an increasingly large percentage of the uncertainty associated with fountain clocks and has become a key factor in the performance of fountain clocks. The uncertainty of BBR shift can be reduced by improving the system environment temperature. This study examined the mechanism by which the BBR shift of the transition frequency between the two hyperfine energy levels of the 133Cs ground state is generated and the calculation method for the BBR shift in the atomic fountain. Methods used to reduce the uncertainty of BBR shift were also examined. A fountain system structure with uniform temperature and good heat preservation was designed, and related technologies, such as that for measuring the temperature of the cesium fountain system, were studied. The results of 20 days of measurements, in combination with computer simulation results, showed that the temperature uncertainty of the atomic action zone is 0.12 °C and that the resulting uncertainty of BBR shift is 2.4 × 10−17.

2021 ◽  
Vol 23 (2) ◽  
pp. 023032
Author(s):  
V I Yudin ◽  
A V Taichenachev ◽  
M Yu Basalaev ◽  
O N Prudnikov ◽  
H A Fürst ◽  
...  

2004 ◽  
Vol 70 (3) ◽  
Author(s):  
Filippo Levi ◽  
Davide Calonico ◽  
Luca Lorini ◽  
Salvatore Micalizio ◽  
Aldo Godone

2013 ◽  
Vol 87 (1) ◽  
Author(s):  
M. S. Safronova ◽  
S. G. Porsev ◽  
U. I. Safronova ◽  
M. G. Kozlov ◽  
Charles W. Clark

2010 ◽  
Vol 82 (2) ◽  
Author(s):  
M. S. Safronova ◽  
Dansha Jiang ◽  
U. I. Safronova

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
A. Golovizin ◽  
E. Fedorova ◽  
D. Tregubov ◽  
D. Sukachev ◽  
K. Khabarova ◽  
...  

2012 ◽  
Vol 238 ◽  
pp. 608-610
Author(s):  
Bin Hu ◽  
Rong Yue Zheng ◽  
Bi Fei Zhou

Currently our country high-rise construction technology develops forward an important content to reduce the structure dead weight. The ceramsite concrete which makes full use of industry waste material obtains the good social efficiency and helps to reduce the structure dead weight effectively. At the same time, it has the good heat preservation performance as well as the fire protection performance. The short pier shear wall comes by the general shear wall development. It has absorbed irregular cross-section column structure’s merits. It is also easy to satisfy each kind of building plane request. Moreover, it has the lighter weight, saves the material and decreases earthquake function contrast to the general shear wall.


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