{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2025-10-16-deepmind-cfs-torax-fusion/","md":"https://postcutoff.com/e/2025-10-16-deepmind-cfs-torax-fusion/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2025-10-16-deepmind-cfs-torax-fusion","date":"2025-10-16","date_precision":"day","short_title":"Google DeepMind partners with Commonwealth Fusion Systems to optimise and control the SPARC tokamak with AI","deck":null,"takeaway":"DeepMind announced a research partnership with Commonwealth Fusion Systems (CFS) for CFS's SPARC tokamak, which aims to be the first magnetic-confinement device to produce net fusion energy.","category":"science","category_label":"Science & math","importance":3,"confidence":"high","status":{"key":"pending","labels":["Event confirmed","Awaiting review"]},"sources":[{"n":1,"title":"Google DeepMind: Bringing AI to the next generation of fusion energy","url":"https://deepmind.google/blog/bringing-ai-to-the-next-generation-of-fusion-energy/","type":"official","group":"primary","domain":"deepmind.google"},{"n":2,"title":"TORAX on GitHub","url":"https://github.com/google-deepmind/torax","type":"code","group":"primary","domain":"github.com"}],"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Google DeepMind","Commonwealth Fusion Systems"],"title":"Google DeepMind partners with Commonwealth Fusion Systems to optimise and control the SPARC tokamak with AI","summary":"DeepMind announced a research partnership with Commonwealth Fusion Systems (CFS) for CFS's SPARC tokamak, which aims to be the first magnetic-confinement device to produce net fusion energy. The work uses DeepMind's open-source JAX plasma simulator TORAX, RL and evolutionary search to find high-output operating scenarios, and RL controllers for real-time tasks such as spreading exhaust heat on the reactor wall. Google is also an investor in CFS.","key_facts":["TORAX: open-source, differentiable plasma transport simulator written in JAX; CFS: it 'saved us countless hours'","Three strands: fast simulation (TORAX), searching operating scenarios with RL/evolutionary algorithms, and RL real-time control (e.g. heat-load distribution)","Builds on DeepMind's 2022 RL tokamak magnetic-control work with EPFL's Swiss Plasma Center (TCV)","Google has invested directly in CFS"],"key_numbers":[],"tags":["fusion","tokamak","reinforcement-learning","simulation","jax","open-source"],"science":{"field":"physics","subfield":"plasma physics / fusion energy","problem":"Operating and controlling SPARC to reach net fusion energy (Q > 1)","result":"Partnership and tooling announced; no fusion result yet.","open_since":"","ai_system":["TORAX","reinforcement learning agents"],"human_role":"Human-led with AI tools","verification":{"key":"none","label":"Unverified claim","text":"Not applicable (partnership announcement)"},"status":"pending","shock":""},"body_md":"## What happened\n\nDeepMind and CFS said they would use AI to plan and run SPARC's plasma campaigns before the machine reaches full power, with TORAX as the shared simulation layer.\n\n## Why it matters\n\nIt moves AI plasma control from academic demos (TCV, DIII-D) into the commissioning plan of a privately built machine that aims for net energy.","disputed":[{"label":"Verification","text":"Not applicable (partnership announcement)","sources":[]}],"related":[{"id":"2026-09-03-pppl-pacman-fusion-ai-control","url":"https://postcutoff.com/e/2026-09-03-pppl-pacman-fusion-ai-control/","date":"2026-09-03","date_precision":"day","short_title":"PPPL's PACMAN framework lets multiple AI models control a tokamak in ~20 ms, preventing a tearing mode","deck":null,"takeaway":"It is a step toward the AI-supervised operation that future power-plant tokamaks such as SPARC and ITER are expected to need.","category":"science","category_label":"Science & math","importance":2,"confidence":"medium","status":{"key":"confirmed","labels":["Result confirmed"]},"sources":3,"official":1,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Princeton Plasma Physics Laboratory","General Atomics"]},{"id":"2024-02-21-ai-avoids-tokamak-tearing-instabilities","url":"https://postcutoff.com/e/2024-02-21-ai-avoids-tokamak-tearing-instabilities/","date":"2024-02-21","date_precision":"day","short_title":"AI controller predicts and avoids tearing instabilities in the DIII-D fusion reactor","deck":null,"takeaway":"Instabilities that can damage reactors are a key obstacle to fusion power.","category":"science","category_label":"Science & math","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Result confirmed"]},"sources":2,"official":1,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Princeton University","Princeton Plasma Physics Laboratory","General Atomics"]},{"id":"2022-02-16-deepmind-tokamak-plasma-control","url":"https://postcutoff.com/e/2022-02-16-deepmind-tokamak-plasma-control/","date":"2022-02-16","date_precision":"day","short_title":"Deep reinforcement learning controls fusion plasma in the TCV tokamak","deck":null,"takeaway":"It showed that RL could replace complex hand-engineered control in fusion devices and opened the way to AI-designed plasma scenarios.","category":"science","category_label":"Science & math","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Result confirmed"]},"sources":2,"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["DeepMind","EPFL Swiss Plasma Center"]}],"people":[],"posts":[],"videos":[],"models":[],"changes":[{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-09-29","human_review":null,"version":{"date":"2026-10-04"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":null,"in_training_data":true},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":null,"in_training_data":true},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":null,"in_training_data":true},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":null,"in_training_data":true}],"short_url":null}