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Alexander Scheinker¹

¹Applied Electrodynamics Group, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA. ascheink@lanl.gov.

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|August 19, 2024

Summary

This study introduces a non-invasive virtual diagnostic for precisely controlling electron beams at free electron lasers (FELs). A novel generative diffusion model achieves megapixel resolution for real-time beam characterization, enhancing FEL performance.

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Area of Science:

Accelerator Physics
Quantum Optics
Data Science

Background:

Advanced light sources like free electron lasers (FELs) require precise control of relativistic electron beams.
Electron bunch characteristics directly influence the quality and properties of generated coherent light.
Traditional diagnostics for electron beams are often destructive and struggle with time-varying drifts and collective effects.

Purpose of the Study:

To develop a non-invasive method for characterizing electron beam longitudinal phase space.
To achieve high-resolution (megapixel) diagnostics for real-time beam control.
To overcome limitations of destructive measurement techniques in FELs.

Main Methods:

Development of a generative conditional diffusion model.
Application of the model to reconstruct 2D time vs. energy longitudinal phase space distributions.
Validation using experimental data from the European X-ray FEL.

Main Results:

Demonstration of a non-invasive virtual diagnostic for electron beam phase space.
Achieved megapixel resolution (1024x1024) for detailed beam characterization.
Successful generative modeling on real experimental FEL data.

Conclusions:

The developed diffusion model offers a powerful non-invasive tool for electron beam diagnostics.
High-resolution virtual diagnostics can significantly improve the precise control of FELs.
This approach paves the way for enhanced dynamic imaging and FEL operational stability.