High-Intense Gamma-Ray Emission from a Crystalline Undulator with Realistic Bending Profiles

R. Negrello; L. Malagutti; L. Bandiera; N. Canale; F. Cescato; P. Fedeli; V. Guidi; A. Mazzolari; G. Paternó; J. Reyes Garrido; M. Romagnoni; A. Sytov; A. V. Korol; A. V. Solov'yov

arXiv · 2609.15101

High-Intense Gamma-Ray Emission from a Crystalline Undulator with Realistic Bending Profiles

R. Negrello·L. Malagutti·L. Bandiera·N. Canale·F. Cescato·P. Fedeli·V. Guidi·A. Mazzolari·G. Paternó·J. Reyes Garrido·M. Romagnoni·A. Sytov·A. V. Korol·A. V. Solov'yov

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Abstract

The development of compact and intense $γ$-ray sources in the MeV energy range remains a significant frontier in radiation physics, with profound implications for nuclear physics, medicine and applied science. In this work, we present a comprehensive numerical investigation of the photon emission probability and brilliance of a Crystalline Undulator (CU) based on a periodically bent Si(110) crystal. Our approach integrates realistic deformation profiles obtained via Finite Element Method simulations of a realistic sample, where bending is induced by patterned Si$_3$N$_4$ surface stressors. Relativistic molecular dynamics simulations, performed using the MBN Explorer software package, consider a 10 GeV positron beam consistent with the foreseen FACET-II facility specifications. Our results reveal a distinct undulator radiation peak in the 1.6-2.1 MeV range, well-separated from the broader channeling radiation background. We show that for an optimal aperture angle of $1/2γ$, the source reaches a maximum peak brilliance of about $5\times10^{22}$~photons/s/mm$^2$/mrad$^2$/0.1\%~BW. This performance is highly competitive with large-scale Gamma-Beam Systems and exceeds that of Inverse-Compton Scattering sources, confirming the potential of crystalline undulators as high-brilliance, compact light sources for the MeV domain.

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R. Negrello, L. Malagutti, L. Bandiera, N. Canale, F. Cescato, P. Fedeli, V. Guidi, A. Mazzolari, G. Paternó, J. Reyes Garrido, M. Romagnoni, A. Sytov, A. V. Korol, A. V. Solov'yov. 2026-09-14. High-Intense Gamma-Ray Emission from a Crystalline Undulator with Realistic Bending Profiles. https://arxiv.org/abs/2609.15101

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