Title :
Evaluation of NPL CSF1 Primary Frequency Standard
Author :
Szymaniec, K. ; Chalupczak, W. ; Henderson, D. ; Ovchinnikov, Y.
Author_Institution :
National Phys. Lab., Teddington
Abstract :
A full performance evaluation of the caesium fountain primary frequency standard at the NPL is reported. Improved magnetic shielding has resulted in the inhomogeneity of the C-field being below 1 nT. The measurement of the frequency bias due to cold collisions is described. A direct evaluation of the fountain´s frequency stability, in comparison to that of a hydrogen maser, is reported
Keywords :
atomic collisions; frequency standards; magnetic shielding; masers; NPL CSF1; caesium fountain; cold collisions; frequency bias measurement; hydrogen maser; magnetic shielding; primary frequency standard; Atom optics; Atomic beams; Atomic measurements; Cooling; Frequency measurement; Hydrogen; Lattices; Masers; Phase noise; Stability;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2004 Conference on
Conference_Location :
London
Print_ISBN :
0-7803-8494-6
Electronic_ISBN :
0-7803-8494-6
DOI :
10.1109/CPEM.2004.305329
