Beam-beam study of ERL based eRHIC

TL;DR

This paper analyzes the beam-beam effects in the eRHIC collider, highlighting unique challenges and potential solutions to optimize luminosity and beam quality in an ERL-based electron-ion collider.

Contribution

It provides a detailed study of beam-beam interactions specific to ERL-based colliders like eRHIC, including effects and mitigation strategies not previously explored.

Findings

Identification of disruption and mismatch effects on electron beams

Analysis of kink instability and noise heating on ion beams

Proposed countermeasures to mitigate beam-beam effects

Abstract

Beam-beam effects in eRHIC, the proposed ERL-based Electron-Ion Collider (EIC) at BNL, have several unique features distinguishing them from those in hadron-colliders and lepton-colliders. Taking the advantage of the fact that the electron beam is used only once, we expect the luminosity to be 10 times greater than for the ring-ring collision scheme with similar parameters. However, without instituting proper treatments, the quality of electron and hadron beams can undergo degradation or even beam loss, driven by the beam-beam interactions. We will discuss the harmful effects, including the disruption and mismatch effect of the electron beam, the kink instability and the noise heating of the ion beam and the possible countermeasures.