The construction of an optically pumped Cs beam primary frequency standard was undertaken in the PTF laboratory. The main features of its design are described. Preliminary results and values of the major frequency shifts are then given. The measured short-term stability is reported.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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