National Physical Laboratory India has developed a cesium atomic fountain frequency standard. The fountain has now become operational and is ready for complete frequency evaluation. In this paper, we report for the first time, the preliminary results obtained with this fountain, which include Ramsey fringes, frequency stability analysis, with an H-maser, and magnetic field mapping in the atomic flight region.
Teleprinter signals on long and medium haul land-line and radio circuit get distorted causing delay in exchange of information due to its garbled reception. The authors have designed a simple start-stop regenerator to correct the distortions to the minimum to enable the acceptance of signals by the printing system.
The design evolved is simple in its circuitry capable of correcting distortions upto 49 per cent and also can accommodate a speed variation of ±10 bauds. The regenerator can be used on circuits operating on 50, 75, 100 and 200 bauds speed.
We describe the current state of progress of the Cesium fountain frequency standard development at the National Physical Laboratory India (NPLI). The optical set-up of the fountain needed to capture, cool, manipulate and detect the cesium atoms is discussed in detail. The concept and design of physical structure of the fountain is also described. In addition, some of the recent results on cooling and trapping of cesium atoms are reported.
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