Dual aperture high luminosity collider at Cornell

We describe a very high luminosity electron-positron collider that operates in the ϒ_4s energy range. Trajectories intersect with a small horizontal crossing angle so that closely spaced bunches collide only at the interaction point. An electrostatic deflector steers the counter-rotating beams into side-by-side vacuum chambers that share a common dipole guide field. The beams also share superconducting RF accelerating cavities. Independent focusing and chromaticity correction is provided by dual aperture superconducting quadrupoles and sextupoles. The machine is installed above the synchrotron injector in the CESR tunnel. The existing storage ring can remain for service as an accumulator or dedicated synchrotron light source. With 3A/beam in 180 bunches, β_ν*=7 mm, beam-beam tune shift parameter ξ=0.06 and beam energy of 5.3 GeV, we anticipate luminosity of 3×10³⁴cm^-2s^-1