KEK-B particle accelerator. The two main rings of the KEK-B factory accelerator at Tsukuba, Japan. This is an asymmetric electron-positron collider at 8x3.5 gigavolts (GeV). This linear accelerator injects electrons into the green ring (high energy ring, HER) and positrons into the blue ring (low energy ring, LER). The rings consist of 1600 magnets which guide and accelerate the particles toward a collision point at a centre-of-mass energy of 10.58 GeV. Here, a BELLE detector records the energies released and subatomic parti- cles created by the collisions. The KEK-B factory is dedicated to researching the CP violation mystery and other topics in B-Meson decays.