Influence of bending parameters on crystalline undulator radiation peak stability for 530 MeV positron channelling

TL;DR

This study uses molecular dynamics simulations to analyze how bending parameters in crystalline undulators affect the stability and energy of emitted radiation peaks, providing guidance for designing gamma-ray sources.

Contribution

It offers new insights into the effects of bending amplitude and period on CUR peak stability and energy, with practical estimates for manufacturing tolerances.

Findings

Increasing bending amplitude shifts the CUR peak to lower energies.

Decreasing bending period shifts the CUR peak to higher energies.

The CUR peak remains stable over a range of bending parameters.

Abstract

We investigate the stability of crystalline undulator radiation (CUR) peaks emitted by 530 MeV positron channelling in periodically bent C(110) crystals with varying bending amplitudes and bending periods. Relativistic molecular dynamics simulations were performed to quantify how these parameters affect the intensity and position of the CUR peak. The continuous potential approximation was used to identify isolines of constant peak energy, providing a reference for regions of spectral stability. MD results show that increasing the bending amplitude shifts the CUR peak to lower photon energies, while decreasing the period shifts it to higher energies, with both trends accompanied by enhanced dechannelling. For crystal parameters similar to recent experiments conducted at the MAinz MIkrotron (MAMI), the simulated CUR peak appears near 0.515 MeV. These results demonstrate that the CUR peak remains stable across a broad range of bending amplitudes and periods, establishing estimates of manufacturing tolerances for the design of gamma-ray crystal-based light sources.