The New NRC 2.1 Metre Primary Cesium Beam Frequency Standard, Cs V

The design and construction of the new NRC 2.1 metre cesium beam frequency standard, Cs V, are described and preliminary performance data are given. The standard is equipped with a cesium oven and detector at each end, and experiments show that it functions satisfactorily for both beam directions, with negligible interaction between the adjacent oven and detector. Operating characteristics for both beam directions are discussed in detail, and systematic errors for both modes of operation are outlined. Preliminary estimates indicate that the accuracy is between 1 and 2 × 10 -13 . Comparisons with the NRC hydrogen masers show that a frequency stability of about 1 × 10 -13 is attainable within 120 sec.