DIII-D Partners to Test New Fusion Reactor Divertor
The installation seeks to mitigate heat burst instabilities to improve the efficiency of fusion energy pilot plants.
Updated on Oct. 15, 2026 in Nuclear
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The DIII-D National Fusion Facility in San Diego has entered a partnership with Kyoto Fusioneering to install a specialized divertor designed for negative triangularity plasma operations. This research-stage project aims to evaluate how this plasma shape can manage heat and particle exhaust more effectively than traditional tokamak designs.
Why it matters
Managing heat exhaust is a critical barrier for fusion energy, and this partnership aims to solve the problem of edge-localized mode instabilities that can damage tokamak components. The resulting data will be shared with fusion pilot plant developers to accelerate reactor engineering.
The project follows a 2023 DIII-D test of a temporary divertor setup. The new installation will allow researchers to test whether negative triangularity—a plasma shape initially considered in the 1970s—can avoid edge-localized mode heat burst instabilities.
The players
DIII-D National Fusion Facility
A tokamak facility in San Diego specializing in magnetic confinement fusion research and core-edge integration.
Kyoto Fusioneering
A technology firm providing advanced components and engineering services for fusion energy systems.
Columbia University
An academic institution contributing to the plasma research and divertor investigation project.
The details
Tokamaks use a divertor to extract heat and impurities from the plasma. A divertor — a device located at the bottom of the vacuum vessel that directs particle exhaust away from the reactor wall — is being redesigned to support negative triangularity. By shaping the plasma with negative triangularity, researchers aim to stabilize the plasma edge, preventing the heat burst instabilities that typically damage the plasma-facing components. Kyoto Fusioneering will manufacture the specific tiles required for this modified internal configuration.
Timeline
1970s and 1980s: Negative triangularity was initially considered for tokamak operations.
2023: DIII-D conducted a negative triangularity campaign with temporary tiles.
Early 2026: DIII-D announced a partnership with Oak Ridge National Laboratory.
The Tech Race
This collaboration marks a shift from temporary experimental setups to dedicated hardware for testing plasma exhaust. It follows the long-standing DIII-D National Fusion Facility research program that has sought to optimize plasma confinement for future pilot plant designs.
This research provides fundamental data for fusion pilot plant developers rather than immediate consumer applications. The findings will eventually influence how reactor components are designed for future energy stability and thermal management.
The takeaway
This project validates a specific plasma geometry that could resolve long-standing stability issues in fusion reactors. Observers should watch for data releases from the upcoming experimental runs as they will inform the standard design parameters for future fusion energy pilot plants.
Further reading
For broader context on fusion reactor engineering, see our Nuclear section.
Source note: This article includes information reported by Ans.
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