Tokamak vs Stellarator: Engineering Trade-offs
Comparison of plasma stability, construction complexity, maintenance, and cost between the two leading fusion approaches.
Key Highlights
- ✓ Plasma confinement comparison
- ✓ Construction complexity analysis
- ✓ Maintenance accessibility
- ✓ Cost per watt projections
- ✓ Private company approaches (CFS, Helion, Type One Energy)
Overview
A detailed engineering comparison of tokamak and stellarator fusion reactor designs. Covers plasma stability, construction complexity, maintenance challenges, cost projections, and the trade-offs that determine which approach will succeed first.
What's Inside
Plasma Confinement
Tokamaks use axisymmetric fields and plasma current for confinement, requiring pulsed operation or current drive systems. Stellarators use complex 3D magnetic fields for steady-state operation but require precise coil manufacturing. We compare beta limits, energy confinement times, and MHD stability.
Engineering and Cost
Tokamaks benefit from simpler coil design and decades of operational experience but face disruptions and first-wall maintenance challenges. Stellarators offer steady-state operation and easier maintenance but require ~3x more superconducting material. We project LCOE for both approaches.
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