21–27 Sept 2025
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

Correlating post-wakefield acceleration laser spectra with electron beam spectra to bulid an indirect electron diagnostic

Not scheduled
1h 30m
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy

Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy

La Biodola Bay - 57037 Portoferraio Isola d’Elba (Li) - Italy
Poster (student) PS7: Beam diagnostics, instrumentation, Machine Learning Poster Session

Speaker

Paul Gellersen (University of York)

Description

The driving laser's spectrum evolves during laser-wakefield acceleration due to the density and intensity gradients in the driven plasma wave. These density gradients also determine the accelerating fields experienced by injected electrons, and so the post-acceleration laser spectrum may be correlated with the electron spectrum, potentially allowing for its use as a non-disruptive diagnostic of the electron beam spectrum. This would be useful in any application that uses the electron beam in a disruptive way, including several methods of light generation and, of particular interest to the authors, radiation reaction studies.

The relationship is highly non-linear however, and so we make use of machine learning approaches and train a model using not only the laser and electron spectra, but also additional diagnostics measuring the post-acceleration laser energy and spot size. This approach is validated using idealised PIC simulation and then tested on real data from an inverse-Compton scattering experiment carried out at ELI-NP in April 2024. I will present on the method, its quality as an indirect diagnostic, and plans to improve it.

Primary author

Paul Gellersen (University of York)

Co-authors

Alec Thomas (University of Michigan) Annabel Gunn Brandon Russell (Princeton University) Brendan Kettle (Imperial College London) Christopher Murphy (University of York) Christopher Ridgers (University of York) Daniel Symes Elias Gerstmayr (Queen's University Belfast) Gianluca Sarri Laurence Bradley Lucian Tudor (Extreme Light Infrastructure-Nuclear Physics (ELI-NP)) Oliver Finlay (Central Laser Facility) Owen Lawrence (University of York) Rajeev Pattathil (Rutherford Appleton Laboratory) Rebecca Fitzgarrald (University of Michigan) Stuart Mangles (Imperial College London) Temour Michael Foster

Presentation materials

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