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PreprintCC BY-NC-SA 4.0arXiv

Design and study of the electron beam-line at the European XFEL (ELBEX) for strong field quantum electro-dynamics

  • Marin Deniaud
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Abstract

Quantum electro-dynamic (QED) processes have been studied in the perturbative regime, well below the Schwinger limit. Exploring QED above this limit would require electric fields only obtainable in the lab frame with Lorentz boosting. Laser Und XFEL Experiment (LUXE) is an international project that aims to collide the 17.5 GeV electrons of the European XFEL with a high-power laser, allowing the study of non-linear Compton scattering, non-linear Breit-Wheeler pair creation and non-linear Trident process. The electron beam line at the European XFEL (ELBEX) project aims to provide the electron beam for LUXE and two other experiments. This project will be in the currently unused XTD8 tunnel of the EuXFEL and a new transport beam line must be designed. From the existing beam path, it will extract specific bunches and focus the transverse beam sizes at the needed locations for the experiments. Using the accelerator tracking code Xsuite, an achromatic and isochronous beam line was designed. There are two main phenomena that can impact the measured signal at LUXE. The first one is the background particles reaching the detectors, coming from the beam interactions with the residual gas and the beam pipe. Background simulations realized with the Geant4 based software BDSIM showed that there was not significant impact on the LUXE IP background rates. The second phenomena are the variations in electron bunches properties, i.e. beam jitter. Measurements at the EuXFEL are performed to evaluate the jitter for various beam parameters. Electron-laser collision simulations performed with Ptarmigan showed that beam size jitter is the only parameter with major impact on the signal at LUXE. The compact linear accelerator for research and applications (CLARA) facility is also looking at the possibilities of QED interactions by colliding a 250 MeV electron beam with 100 TW laser pulses.

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Cite

BibTeXRIS
BibTeX
@misc{deniaud2026design,
  title = {{Design and study of the electron beam-line at the European XFEL (ELBEX) for strong field quantum electro-dynamics}},
  author = {Marin Deniaud},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.08210},
  eprint = {2611.08210},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.08210},
  note = {CC BY-NC-SA 4.0},
}
RIS
TY  - UNPB
TI  - Design and study of the electron beam-line at the European XFEL (ELBEX) for strong field quantum electro-dynamics
AU  - Marin Deniaud
PY  - 2026
DA  - 2026/11/05
PB  - arXiv
DO  - 10.48550/arxiv.2611.08210
UR  - https://arxiv.org/abs/2611.08210
AB  - Quantum electro-dynamic (QED) processes have been studied in the perturbative regime, well below the Schwinger limit. Exploring QED above this limit would require electric fields only obtainable in the lab frame with Lorentz boosting. Laser Und XFEL Experiment (LUXE) is an international project that aims to collide the 17.5 GeV electrons of the European XFEL with a high-power laser, allowing the study of non-linear Compton scattering, non-linear Breit-Wheeler pair creation and non-linear Trident process. The electron beam line at the European XFEL (ELBEX) project aims to provide the electron beam for LUXE and two other experiments. This project will be in the currently unused XTD8 tunnel of the EuXFEL and a new transport beam line must be designed. From the existing beam path, it will extract specific bunches and focus the transverse beam sizes at the needed locations for the experiments. Using the accelerator tracking code Xsuite, an achromatic and isochronous beam line was designed. There are two main phenomena that can impact the measured signal at LUXE. The first one is the background particles reaching the detectors, coming from the beam interactions with the residual gas and the beam pipe. Background simulations realized with the Geant4 based software BDSIM showed that there was not significant impact on the LUXE IP background rates. The second phenomena are the variations in electron bunches properties, i.e. beam jitter. Measurements at the EuXFEL are performed to evaluate the jitter for various beam parameters. Electron-laser collision simulations performed with Ptarmigan showed that beam size jitter is the only parameter with major impact on the signal at LUXE. The compact linear accelerator for research and applications (CLARA) facility is also looking at the possibilities of QED interactions by colliding a 250 MeV electron beam with 100 TW laser pulses.
ER  -