Electron Channeling and Radiation in Crystalline Materials

Electron channeling occurs when relativistic electrons traverse a crystalline lattice aligned along specific planes or axes, experiencing periodic electrostatic potentials that guide their trajectories and suppress incoherent scattering. Within such channels, electrons emit distinctive electromagnetic radiation—known as channeling radiation—whose spectral and angular properties depend on crystal orientation, bending radius and particle energy. Bent crystals introduce additional coherent effects such as volume reflection, whereby non-channelled electrons are smoothly deflected by the curved potential, extending angular acceptance. Key parameters include the dechanneling length, which quantifies the average distance before particles leave a channelled state, and the bending amplitude that governs oscillatory motion in periodically bent structures, or crystalline undulators. Advances in Monte Carlo simulations and precision fabrication have refined predictive models of particle trajectories and radiation spectra. Practical applications range from compact X-ray and γ-ray sources to hybrid positron injectors for future colliders, as well as high-performance photon absorbers and beam dumps. Emerging research explores optimised crystal geometries and hybrid converter schemes to enhance photon yield, reduce energy deposition and open new avenues in medical imaging and high-energy physics instrumentation.

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Electron Channeling and Radiation in Crystalline Materials publication trend

The graph below shows the total number of articles in electron channeling and radiation in crystalline materials across all publications each year (not limited to Nature Index journals).

Technical terms

Channeling: Confinement of charged-particle trajectories along crystallographic planes or axes due to periodic electrostatic potentials within a crystal lattice.

Volume reflection: Smooth deflection of non-channelled particles by the bent crystal potential, offering broader angular acceptance than channeling.

Dechanneling length: Characteristic distance over which initially channelled particles are scattered out of the channelled state.

Crystalline undulator: Periodically bent crystal structure that induces oscillatory motion of channeled particles, producing quasi-monochromatic radiation.

Hybrid positron source: Two-stage converter system in which electrons first radiate photons in an oriented crystal before the photons convert into positrons in a secondary target.

References

1. Strong enhancement of electromagnetic shower development induced by high-energy photons in a thick oriented tungsten crystal. European Physical Journal C (2023).
2. Channeling, volume reflection, and volume capture study of electrons in a bent silicon crystal. Physical Review Accelerators and Beams (2016).
3. Simulation code for modeling of coherent effects of radiation generation in oriented crystals. Physical Review Accelerators and Beams (2019).
4. Investigation on radiation generated by sub-GeV electrons in ultrashort silicon and germanium bent crystals. European Physical Journal C (2021).
5. Crystal-based pair production for a lepton collider positron source. European Physical Journal C (2022).
6. The global bifurcation and chaotic behaviours for the crystalline undulator radiation. Acta Physica Sinica (2010).