Limits RegistryPUBLIC RECORD
Limits RegistryITER, under construction at Saint-Paul-lez-Durance in southern France by a 35-nation collaboration, is designed for a plasma volume of about 840 m³ — ten times larger than any previous tokamak — aiming at 500 MW of fusion power from 50 MW of heating (Q = 10). Its first plasma is scheduled for the 2030s.
The question, scope, and sources behind this Registry record.
ITER, under construction at Saint-Paul-lez-Durance in southern France by a 35-nation collaboration, is designed for a plasma volume of about 840 m³ — ten times larger than any previous tokamak — aiming at 500 MW of fusion power from 50 MW of heating (Q = 10). Its first plasma is scheduled for the 2030s.
The largest design plasma volume of any tokamak built or under construction.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
This record has no editable parameters. Read the formal question and assumptions before challenging it.
Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-LARGEST-TOKAMAK-UNDER-CONSTRUCTION-ITER
No active verified bounties are linked to this Limit.
View verified bounty tracker ↗No accepted machine-checked reproductions are recorded for this Limit.
Limits Registry. LR-LARGEST-TOKAMAK-UNDER-CONSTRUCTION-ITER. Largest tokamak ever built (plasma volume). 2026.