Parameters of the steady photoplasma in a gas mixture of Cs and Ar in a cylindrical cell with the radius R = 0.5 cm and length L = 1 cm are determined for pressures PCs = 0.02 torr and PAr = 1 torr within the framework of a self-consistent model taking into account the absorption and transfer (in the Biberman-Holstein approximation) of resonance radiation, plasma chemical reactions and charge transfer processes. The effect of broadening of the resonance D1 and D2 lines of Cs by the CsCs, ArCs and eCs collisions on the radiation transfer is taken into account.