• Y. Zhang, Y.S. Derbenev, G.A. Krafft, B.C. Yunn
  JLAB, Newport News, Virginia

The conceptual design of a polarized ring-ring electron-ion collider based on the CEBAF recirculated electron SRF linac relies on high repetition rate and high averaged current ion beams with very short bunch length and very small transverse emittance for reaching ultra high collider luminosity, up to middle of 10³⁴ s^-1cm^-2. Nevertheless, making of such ion beams is a significant challenge, depending on various accelerator R&D including ion source, SRF linac, staged electron cooling and crab crossing at interaction points. In this paper, we will present some new ideas and concepts towards to realization of high collider luminosities, as well as preliminary conceptual design of various components of an ion complex that is capable to create such ion beams.