Title :
Progress of the fountain frequency standard at NMIJ in 2008
Author :
Yanagimachi, S. ; Takamizawa, A. ; Watabe, K. ; Hagimoto, K. ; Ikegami, T.
Author_Institution :
Time & Freq. Div., AIST, Tsukuba, Japan
Abstract :
National Metrology Institute of Japan (NMIJ) is developing two fountain frequency standards (NMIJ-F1, NMIJ-F2). NMIJ-F1 is in the phase of operation for continuous monthly report since February in 2008. The possibility of the reduction in the uncertainty caused by the collisional shift that mainly limits the total uncertainty of NMIJ-F1 is presented. The construction of NMIJ-F2 proceeded, and then the launched atomic signal was observed.
Keywords :
frequency standards; fountain frequency standard; Atomic measurements; Frequency conversion; Frequency estimation; Frequency measurement; Hydrogen; Masers; Metrology; Stability; Standards development; Uncertainty;
Conference_Titel :
Frequency Control Symposium, 2009 Joint with the 22nd European Frequency and Time forum. IEEE International
Conference_Location :
Besancon
Print_ISBN :
978-1-4244-3511-1
Electronic_ISBN :
1075-6787
DOI :
10.1109/FREQ.2009.5168348
