ELIC: A High Luminosity And Efficient Spin Manipulation Electron‐Light Ion Collider Based At CEBAF

Electron‐light ion colliders with center of mass energy between 20 and 100 GeV, luminosity between 1033 and 1035 cm−2 sec−1, and polarization of both beams at or above 80% have been proposed for the study of hadronic structure. The Electron‐Light Ion Collider (ELIC) facility would require the upgrade of CEBAF to 5–7 GeV energy recovering linac and the realization of an ion storage ring complex, accelerating and storing light ions of up to 150 GeV. In this report several innovative features of electron and ion beam designs and their advantages in delivering the luminosity and spin are described. These features include: electron circulator ring to reduce electron polarized source and energy recovering linac requirements, twisted spin booster and collider ring; interaction points with low beta‐star and crab‐crossing using the short, cooled ion bunches. Accelerator physics and technology issues for both protons/ions and electrons are presented. The feasibility of an integrated fixed target program at 25 GeV a...