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ITER is a global collaboration between 35 nations — the European Union (via EURATOM), China, India, Japan, Korea, Russia and the United States — building the world’s largest tokamak in Cadarache, France, to prove that nuclear fusion can become a viable, large-scale energy source. As a production run of one, the Tokamak has to work right the first time: there is no prototype run and no budget for rework.
Eighteen 14-meter “D”-shaped superconducting magnets ring the vacuum vessel, each requiring a toroidal gap tolerance of just ±0.5 mm. Heat, structural loads and magnetic forces during operation squeeze and shift the structure — if gap uniformity drifts out of specification, the resulting stress can pull magnets out of alignment and damage the device.
3DCS Variation Analyst models the full Tokamak assembly — 600+ parts, 15,000+ points and 760 functional moves — running Monte Carlo simulations to determine compliance status and quantify the risk impact of dimensional variation before parts reach final assembly.
3DCS is deployed as a CAA V5-based application, integrating tolerance analysis directly into ITER’s CATIA V5 design environment for configuration management and compliance tracking, with no reformatting of native CAD data.
ITER's dimensional team has advanced the Tokamak tolerance model for over a decade, adding analysis modules to improve accuracy and reduce run time.
A full 5,000-iteration tolerance analysis of the Tokamak model now runs in just 15 minutes, accelerating configuration management and risk assessment.
The model supports 6,000 measurements used to verify compliance status and run impact studies across 30 functional and assembly requirements.
Tolerance analysis on the eighteen D-shaped magnets keeps the toroidal gap within ±0.5 mm, preserving structural alignment under extreme operating stress.
ITER engineers now wait for 3DCS analysis results before their next design move, using the data to drive the decision-making process rather than assumption.
Since the first Tokamak Tolerance Model was built, ITER’s dimensional team has kept extending it with new 3DCS analysis modules.
The model now tracks roughly 14,500 tolerances and 35,000 measurements — up from the 2,200 tolerances and 760 functional moves of the original build — with contributions from all 35 partner nations.
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