A Collimation System Baseline Design for the Electron Storage Ring at the Electron-Ion Collider

TL;DR

This paper proposes a baseline collimation system for the Electron-Ion Collider's electron storage ring, effectively reducing beam losses, radiation, and detector backgrounds while maintaining beam quality and allowing future optimizations.

Contribution

It introduces a novel collimation design tailored for the EIC electron ring, demonstrating its effectiveness through simulations and outlining plans for further refinement.

Findings

Significant reduction in beam-gas and Touschek scattering losses.

Collimators do not adversely affect machine acceptance or beam lifetime.

Design provides a robust baseline for future lattice optimizations.

Abstract

We present the baseline design of the electron ring collimation system for the Electron-Ion Collider (EIC) at Brookhaven National Laboratory (BNL). The system addresses beam losses in a high-current electron storage ring with superconducting (SC) final-focus magnets and sensitive detectors, where uncontrolled losses can generate heat loads, radiation, and detector backgrounds and damage. The proposed collimation insertion localizes halo particle losses through reducing interaction region beam losses from beam-gas and Touschek scattering by several orders of magnitude while keeping detector backgrounds and cryostat heat loads within acceptable limits. Multi-turn particle tracking simulations show that the collimators do not significantly impact machine acceptance or beam lifetime, and their positions and apertures can be re-optimized for future lattice configurations. Ongoing work includes incorporating crab cavities and solenoid fields into simulations, refining vacuum conditions, and optimizing collimator geometry and materials. This design establishes a robust baseline for the EIC electron ring collimation system and supports continued lattice optimization for machine operations.