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Oak Ridge lab readies MPEX materials testbed as fusion pushes toward the grid
Summary
Oak Ridge National Laboratory says its Material Plasma Exposure Experiment (MPEX) will stress-test candidate fusion materials and is expected to be operational by 2028, part of ORNL collaborations with industry and universities to accelerate commercial fusion deployment.
Oak Ridge National Laboratory is assembling a dedicated materials testbed to evaluate how reactor components will withstand the extreme conditions inside fusion devices, a laboratory official said on the lab’s Sound of Science podcast.
"MPEX is gonna be a plasma flamethrower," Troy Carter of ORNL's fusion energy division said, describing the Material Plasma Exposure Experiment's goal of subjecting materials to intense heat and particle fluxes that mimic fusion environments. Carter said the facility is being assembled now and ORNL hopes to have it operational by 2028.
The experiment is intended to help researchers measure erosion, material response and fuel retention across a range of fusion concepts, Carter said, testing not only plasma-facing materials but also exhaust systems, maintenance approaches and manufacturability considerations. "You can't be replacing the wall of your device every two months," Carter said, arguing materials durability is essential to commercial viability.
Hosts pointed to ORNL’s broader capabilities — including facilities such as the High Flux Isotope Reactor (HFIR) and the Spallation Neutron Source (SNS) and advanced simulation resources — as reasons the lab can play a coordinating role in the transition from scientific experiments to engineered power plants. Carter said leveraging national-lab assets alongside private-sector speed can reduce industry risk and help the United States capture the fusion industry.
The lab's MPEX project and related activities were described as part of collaborations with industry and the University of Tennessee to create a high-heat-flux facility and to evaluate materials intended for near-commercial fusion devices. Carter cautioned that while progress is real, challenges and technical risk remain.
