  We demonstrate state-of-the-art technique of an active clock to provide a
continuous superradiant lasing signal using an ensemble of trapped Cs atoms in
the optical lattice. A magic wavelength of the proposed |7S1/2; F = 4, MF = 0>
- |6P3/2; F = 3, MF = 0> clock transition in Cs atom is identified at 1181 nm
for constructing the optical lattice. Pertinent optical lines are also found
for pumping and repumping atoms from their ground states. A fractional
uncertainty about 10-15 level to the clock frequency has been predicted by
carrying out rigorous calculations of several atomic properties. The bad-cavity
operational mode of the active clock is anticipated to improve its short-term
stability remarkably by suppressing intrinsic thermal fluctuations. Thus, a
composite clock system with better in both short-term and long-term stabilities
can be built by combining the above proposed active clock with another
high-accuracy passive optical clock.
