Thomas A. J. Body is a 🏷️#physicist at 📝Commonwealth Fusion Systems, where he has worked on boundary and edge modelling since October 2022. He is second author, with 📝Thomas Eich, of "Power and particle exhaust for the ARC fusion power plant" (2026). He took his doctorate at the 📝Max Planck Institute for Plasma Physics, a master's in fusion energy at the University of York, and an honours bachelor's degree at the Australian National University.

Body's earlier work was code validation: testing whether edge turbulence simulations reproduce a real machine before anyone trusts them on a machine that does not exist. He contributed to the GRILLIX flux-coordinate-independent turbulence code and to the multi-code validation against the TCV-X21 diverted 📝L-mode reference case on 📝TCV, and to global Braginskii simulations of the 📝ASDEX Upgrade edge and 📝scrape-off layer — including the finding that neutral gas has to be in the model for the simulated edge to match the measured one. That validation lineage is what the 2026 ARC exhaust paper spends: it predicts that 📝ARC reaches 📝divertor detachment with argon 📝impurity seeding of roughly 0.9 % in the 📝divertor, at a divertor neutral pressure near 20 pascals sufficient to pump 📝helium ash below 2 % in the core, with a core 📝Zeff penalty under 0.5. Every one of those is a modelled projection for an unbuilt machine, and the paper is explicit that large type-I 📝edge localized modes would break detachment and must be avoided — a question 📝SPARC is meant to settle.