Upper limit on efficiency of electron deflection in bent crystals

TL;DR

This paper evaluates the maximum achievable efficiency and deflection angles of electrons in bent crystals across a wide energy spectrum, highlighting potential applications in beam extraction for accelerators.

Contribution

It provides the first comprehensive assessment of physical limits on electron deflection efficiency and angles in bent crystals using experimental data and simulations.

Findings

Maximum deflection angles are 2-3 mrad at sub-GeV energies.

Deflection angles decrease to 0.5-1 mrad at sub-TeV energies.

Electron channeling can be used for beam extraction in accelerators.

Abstract

Basing on experiments at SLAC, MAMI, CERN, and on Monte Carlo simulations, we assess the physical limits on efficiency and reachable angles of electron deflection in bent crystals in the energy range from sub-GeV to sub-TeV. We find that applications of electron channeling for beam deflection are possible, limited by maximal deflection angle of 2-3 mrad at sub-GeV, 1-2 mrad at multi-GeV, and 0.5-1 mrad at sub-TeV energy. This opens opportunities for crystal-assisted electron beam extraction from accelerator rings.