High-energy high-luminosity electron-ion collider eRHIC
  In this paper, we describe a future electron-ion collider (EIC), based on the existing Relativistic Heavy Ion Collider (RHIC) hadron facility, with two intersecting superconducting rings, each 3.8 km in circumference. A new ERL accelerator, which provide 5-30 GeV electron beam, will ensure 10^33 to 10^34 cm^-2 s^-1 level luminosity. 
Vladimir N. Litvinenko, Joanne Beebe-Wang, Sergei Belomestnykh, Ilan   Ben-Zvi, Michael M. Blaskiewicz, Rama Calaga, Xiangyu...
physics.acc-ph