Fixed-energy cooling and stacking for an electron ion collider
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Copyright 2015 CC-BY-3.0 and by the respective authors. The proposed designs for polarized-beam electron-ion colliders require cooling of the ion beam to achieve and sustain high luminosity. One attractive approach is to make a fixed-energy storage ring in which ions are continuously cooled and stacked during a collider store, then transferred to the collider and accelerated for a new store when the luminosity decreases. An example design is reported for a 6 GeV/u superferric storage ring for this purpose, and for a d.c. electron cooling system in which electron space charge is fully neutralized so that highcurrent magnetized e-cooling can be used to best advantage.