[Cuga] International Workshop on Low Energy e± Physics at Jefferson Lab (LEEPP at JLab)- A message from Eric Voutier

[Lorelei Carlson]

International Workshop on Low Energy e± Physics at Jefferson Lab  (LEEPP at JLab<mailto:LEEPP at JLab>)

The long time interest for positron beams at Jefferson Lab (JLab) forms the basis for an upgrade initiative known as “Ce+BAF 12 GeV”. It will feature high duty factor beams with intensies up to 1 µA within an RF-structure. The positrons for these beams will be produced in the bremsstrahlung shower generated by a lower energy mA electron beam impinging on a high-Z target, utilizing the PEPPo (Polarized Electrons for Polarized Positrons) technique for producing highly spin-polarized positrons in a compact accelerator footprint. This methodology opens up the possibility of also producing lower energy positron beams with high intensity and spin polarization. Beams generated from this source would enable unique experimental programs at JLab with the perspective to reveal details of the electromagnetic interaction, unravel the structure of nucleons and nuclei, and investigate the existence of physics beyond the standard model.

The success of Ce+BAF 12 GeV relies on the development of crucial R&D for generating the required electron and positron beams. Consequently, new capabilities should emerge in the mean time, with opportunities for low-energy (sub-GeV) Nuclear Physics, Atomic Physics and Materials Science. Notably, this R&D aims at intense beams both for generation of polarized electrons at mA intensity and linac based positron beams that have the potential to exceed present capabilities by orders of magnitude. Altogether, output of this effort has a great potential to facilitate a venue for low energy e+/e- physics.

The LEEPP at JLab International Workshop aims to explore new pathways for Science with both unpolarized/polarized electron and positron beams. Beam energies ranging from 1-100 MeV for both species as well as moderated/slow positrons to several eV are within the scope of this workshop. It will be held at Jefferson Lab, November 3rd-7th, 2025 and will discuss low energy scientific opportunities at Jefferson Lab with respect to:
- Positron sources, related equipment and diagnostics
- Nuclear Physics
- Atomic Physics
- Materials Science
- Tests of the Standard Model Physics.
The workshop will include invited talks and selected contributions. Registration and abstract submission will soon open through the workshop page.

Mark your calendars!

The Organizing Committee

David Cassidy (University College London)
Joe Grames (Jefferson Lab)
Douglas Higinbotham (Jefferson Lab)
Kevin Jordan (Jefferson Lab)
Tyler Kutz (Universität Mainz)
Axel Schmidt (George Washington University)
Farida Selim (Arizona State University)
Eric Voutier (Université Paris-Saclay) - Contact

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