Present status of beam lines at KEK

The present status of the beam lines at KEK 12 GeV proton synchrotron is given. The accelerator recently has achieved successful operation to accelerate protons up to 10.4 GeV at the latest run. The time schedule of construction and the program of experiments are also given. A 4 GeV/c unseparated beam, π2, has been just installed at the internal targe area. A beam, Kl, up to 6 GeV/c from the fast extracted proton beam for the bubble chamber experiments is at the final stage of construction. Two experiments with the π2 beam and two experiments with the bubble chamber beam are approved for the initial phase of experiements. These experiments are expected to start in the middle of 1977. Two low momentum separated kaon beams, K2 and K3, up to 2 GeV/c as well as the splitting system of the slow extracted protons are now at the final stage of design and the construction has been partially started. The completion of these beam lines is scheduled in the spring of 1979. Three experiments utilizing the kaon beams a...