German Physicists Confirm Spin Preservation in Laser-Plasma Accelerators via Helium-3 Ion Breakthrough

Physicists at HHU Düsseldorf prove that Helium-3 ion polarization is preserved during laser-plasma acceleration, a key discovery for future nuclear fusion.

By: AXL Media

Published: May 1, 2026, 7:28 AM EDT

Source: Information for this report was sourced from EurekAlert!

A Compact Alternative to Large-Scale Particle Accelerators

In a major advancement for experimental physics, researchers from Heinrich Heine University Düsseldorf and Forschungszentrum Jülich have uncovered critical insights into laser-plasma accelerator technology. While traditional facilities like CERN rely on massive, multi-kilometer ring structures and radio-frequency cavities, laser-plasma accelerators offer a compact and cost-effective alternative. These emerging devices can achieve acceleration gradients up to 1,000 times higher than conventional hardware, potentially democratizing access to high-energy particle physics across smaller research institutions.

The Crucial Role of Spin Alignment in Nuclear Fusion

The study focuses on the preservation of polarization, or collective spin alignment, during the high-intensity acceleration process. Prof. Dr. Markus Büscher, a lead physicist at HHU and Forschungszentrum Jülich, emphasizes that spin alignment is not merely a theoretical curiosity but a mechanical necessity for advanced energy applications. In the context of controlled nuclear fusion, aligning the spins of fusing nuclei in parallel can significantly increase the reaction probability, thereby boosting the total energy yield produced within a reactor.

Proving Polarization Preservation with Helium-3 Isotopes

To verify if spin alignment survives the violent environment of a plasma accelerator, the research team utilized a specific isotope known as Helium-3. The experimental procedure was logistically demanding, requiring the team to generate pre-polarized gas at Forschungszentrum Jülich every morning before transporting it to the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt. There, the researchers utilized the high-power PHELIX laser to accelerate the ions, subsequently using CR-39 detector plates to confirm that the particles maintained their polarization state.