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Taking advantage of the presence of fusion scientists and engineers from all over the world at the 30^th International Atomic Energy Agency (IAEA) Fusion Energy Conference in China this month, the IAEA Nuclear Fusion journal announced the publication of a : “On the Path to Tokamak Burning Plasma Operation.” Physicist David Campbell—the former director of Science & Operations at ������app—served as the coordinating editor for this major scientific endeavour.

The special issue describes the extensive physics R&D activities for ������app and fusion energy development carried out under the International Tokamak Physics Activity (ITPA) between 2007 and 2025. It covers a wide range of physics issues—from plasma confinement and fast particles to plasma control, including power fluxes on plasma-facing components and the mitigation of power transients, and diagnostics to cite a few. The special issue follows the path of the Nuclear Fusion volume in on the ������app physics basis, and the Nuclear Fusion volume in titled “Progress in the ������app Physics Basis"—both summarizing ITPA R&D work for ������app.

The 2025 special issue includes topics of relevance to ������app, as well as to tokamak burning plasmas more generally. In many cases, the underlying physics R&D activities were motivated by specific features of the previous ������app Baseline developed around the staged approach but the scope of the implemented R&D studies has wider implications. In particular, the new and its associated , which were presented at the 30^th IAEA Fusion Energy Conference are, to a substantial degree, based on these ITPA R&D studies.

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