Nonlinear Energy Collimation System for Linear Colliders

TL;DR

This paper proposes a nonlinear optics approach using a skew sextupole pair for energy collimation in linear colliders, aiming to enhance collimator survivability during beam failures.

Contribution

It introduces an alternative nonlinear optics design based on skew sextupoles for energy collimation in linear colliders.

Findings

Skew sextupole pair effectively increases transverse beam size at collimators.

Simulation results demonstrate improved collimator protection.

The method is feasible for high-energy collider applications.

Abstract

The post-linac energy collimation system of multi-TeV linear colliders is designed to fulfil an important function of protection of the Beam Delivery System (BDS) against miss-steered beams likely generated by failure modes in the main linac. For the case of the Compact Linear Collider (CLIC), the energy collimators are required to withstand the impact of a full bunch train in case of failure. This is a very challenging task, assuming the nominal CLIC beam parameters at 1.5 TeV beam energy. The increase of the transverse spot size at the collimators using nonlinear magnets is a potential solution to guarantee the survival of the collimators. In this paper we present an alternative nonlinear optics based on a skew sextupole pair for energy collimation. Performance simulation results are also presented.