The optically pumped Cs beam frequency standard under development in our laboratory was first evaluated in 1993. The short term stability was /spl sigma//sub y/(/spl tau/) is 5.5/spl middot/10/sup -13//spl tau//sup - 1/2 /. The accuracy has been estimated to 1.1/spl middot/10/sup -13/, mainly limited by the distributed phase shift. After modification of the cavity, a new evaluation is in progress and is presented.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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