An Alternate Ring-Ring Design for eRHIC

TL;DR

This paper proposes a new ring-ring design for eRHIC, a polarized electron-ion collider, emphasizing high luminosity, broad energy range, and low technical risk by reusing existing facilities.

Contribution

It introduces an alternate eRHIC design utilizing high repetition rate beams and existing infrastructure, aiming for high performance with reduced R&D.

Findings

Achieves luminosities up to 2x10^34 cm^-2s^-1

Provides polarization higher than 70% for electron and light ion beams

Utilizes existing US facilities for cost-effective implementation

Abstract

I present here a new ring-ring design of eRHIC, a polarized electron-ion collider based on RHIC at BNL. This alternate eRHIC design utilizes high repetition rate colliding beams and is likely able to deliver the performance to meet the requirements of the science program with low technical risk and modest accelerator R&D. The expected performance includes high luminosities over multiple collision points and a broad CM energy range with a maximum value up to 2x10^34 cm-2s-1 per detector, and polarization higher than 70% for the colliding electron and light ion beams. This new design calls for reuse of decommissioned facilities in the US, namely, the PEP-II high energy ring and one section of the SLAC warm linac as a full energy electron injector.