The US Department of Energy's Oak Ridge National Laboratory (ORNL) has executed a licensing agreement with Type One Energy Group for a portfolio of technologies related to cryogenic pellet injection. This agreement provides the private fusion developer with access to systems designed for fuelling and disruption mitigation in fusion reactors, a key enabling technology for continuous plasma operations. The licensed intellectual property stems from over four decades of ORNL research and development in pellet fuelling, which has produced systems for major fusion experiments globally. For Type One Energy, this partnership secures a mature technology essential for the fuel cycle of its planned high-field stellarator, a design concept named FusionDirect. Source: World Nuclear News

Cryogenic pellet injectors are a primary method for introducing deuterium and tritium fuel deep into the core of a high-temperature plasma. The technology involves forming small, solid pellets of hydrogen isotopes at cryogenic temperatures and accelerating them to high velocities, allowing them to penetrate the plasma's edge and deposit fuel in the hot central region. This is more efficient than gas puffing, which primarily fuels the plasma periphery. The ORNL systems also have applications in disruption mitigation for tokamaks, where injecting pellets of impurities can rapidly and radiatively cool the plasma to prevent damage to plasma-facing components during an instability. While stellarators are inherently resilient to major disruptions, precise core fuelling remains a critical challenge for achieving sustained, high-performance operation. Source: World Nuclear News

Cryogenic pellet injectors are a primary method for introducing deuterium and tritium fuel deep into the core of a high-temperature plasma.

This agreement exemplifies the public-private partnership model being advanced by the DOE to accelerate commercial fusion energy development. By transferring technology developed over decades with public funding, national laboratories like ORNL can de-risk critical subsystems for private companies, allowing them to focus on reactor design and integration. Kathy McCarthy, Associate Laboratory Director for Fusion and Fission Energy and Science at ORNL, stated that the lab is committed to this model to help private industry succeed. The partnership allows Type One Energy to incorporate a proven, high-performance fuelling system into its plant design, avoiding the substantial time and capital investment required to develop such a system from the ground up. This approach is central to the US fusion commercialization strategy. Source: World Nuclear News

Type One Energy is developing a stellarator based on a high-field, quasi-axisymmetric configuration, aiming to combine the steady-state operational advantages of the stellarator with the improved confinement properties of optimized magnetic geometries. The company's CEO, Christofer Mowry, described the ORNL technology as the "world's most advanced pellet injectors." Integrating this system is a significant step in maturing the company's balance-of-plant and auxiliary system designs. The next steps for the partnership will involve the transfer of technical knowledge and collaboration between ORNL and Type One Energy engineers to adapt and integrate the pellet injection system into the specific operational requirements and physical layout of the FusionDirect power plant. Source: World Nuclear News