Optimizing the Bent Crystal Parameters for High-Efficiency Beam Extraction and Collimation in Circular Accelerators

TL;DR

This paper investigates how to optimize bent crystal parameters to maximize beam extraction and collimation efficiency in circular accelerators, achieving over 95% efficiency across a wide energy spectrum.

Contribution

It provides a comprehensive analysis of how crystal geometry and imperfections affect efficiency, offering guidelines for optimization in high-energy accelerators.

Findings

Extraction efficiency >95% achievable from 2 GeV to 7 TeV

Optimal crystal parameters depend on energy range and system geometry

Tolerance levels for crystal imperfections are established

Abstract

The efficiency of the beam extraction and collimation systems in circular accelerators with the use of the channeling effect in a bent crystal is determined. The dependences of the extraction efficiency on the geometrical parameters of the crystal (its length, thickness, and bending angle), the azimuthal location of the system components, and the offset of the septum or scraper are presented. The influence of crystal imperfections (amorphous layers, misorientation, and torsion) on the efficiency of the systems is considered, and their tolerances are proposed. It is shown that an extraction efficiency of >95% can be attained over a wide energy range from 2 GeV to 7 TeV by optimizing the crystal parameters and the positions of the system components.