Interplay and specific features of radiation mechanisms of electrons and positrons in crystalline undulators

TL;DR

This paper predicts how the spectral distribution of radiation emitted by ultra-relativistic electrons and positrons in periodically bent crystals varies with bending amplitude, revealing charge-dependent effects due to different radiation mechanisms, crucial for developing novel light sources.

Contribution

It introduces a detailed analysis of radiation mechanisms in periodically bent crystals, highlighting charge-dependent spectral features based on numerical simulations.

Findings

Spectral distributions change with bending amplitude.

Differences observed between electrons and positrons.

Implications for designing crystal-based light sources.

Abstract

We predict peculiar changes in spectral distributions of radiation emitted by ultra-relativistic positrons and electrons in periodically bent crystals with variation of the bending amplitude. It is shown that the changes, being sensitive to the projectile energy, manifest themselves differently for negatively and positively charged projectiles. We demonstrate that the features observed are due to the interplay of different radiation mechanisms occurring in periodically bent crystals. The observations are important for design, practical realization and channeling experiments with periodically bent crystals as the key element of the novel light sources. The analysis presented is based on the grounds of accurate numerical simulations of the channeling process.