Speaker
Description
The Electron Storage Ring (ESR) of the Electron-Ion Collider (EIC) to be built at Brookhaven National Laboratory will provide spin-polarized electron beams at 5, 10, and 18 GeV for collisions with polarized hadrons. Electron bunches with polarization parallel and anti-parallel to the arc dipole fields will co-circulate in the ring at the same time, and each bunch must be replaced once it is sufficiently depolarized by synchrotron radiation. In this work, we detail the unique challenges posed by designing such a collider ring to operate at different energies, and their solutions. This includes satisfying spin matching conditions, calculating optimal energies for polarization, determining best figures-of-merit, and correcting the spin match with optimized closed orbit distortions even where a longitudinal spin match is not feasible. Finally, we show that polarization requirements are exceeded in nonlinear tracking results of the ESR including magnet errors, beam-beam effects, crab cavities, and vertical emittance creation for beam size matching at the interaction point.
Funding Agency
Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
| Region represented | North America |
|---|---|
| Paper preparation format | LaTeX |
