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Saturday, June 13, 2026
Crossfield Fusion — Technical Profile & Analysis
Deep-dive assessment of the Compact closed-orbit velocity-resonant system architecture, fuel path, and market positioning.
Technology Assessment & Commercial Milestones
Magneto-Inertial, Pulsed & Alternative Cores
Pulsed compression schemes that explicitly avoid massive static superconducting magnets, prioritising upfront-capex reductions and modular replicability.
Reactor design
Magneto-Inertial — velocity-resonant
Core tech focus
Non-thermal ion distribution control
Key milestones
Pre-commercial.
Non-thermal velocity-resonant approach: holds ions strictly in a narrow velocity band where the fusion cross-section peaks, bypassing the Maxwellian-distribution bremsstrahlung problem that constrains aneutronic thermal plasmas.
FRC, MTF, sheared-flow Z-pinch and levitated dipole topologies. Helion's magneto-inertial FRC bypasses the thermal steam cycle entirely — plasma magnetic energy directly induces electricity in surrounding coils on expansion. TAE's continuous beam-driven FRC targets p-¹¹B, demanding triple products on the order of 10²⁴–10²⁵ keV·s·m⁻³.
- Pulsed-rep-rate engineering: sustaining 1–10 Hz operation with millisecond-scale energy recovery.
- For aneutronic FRC (TAE), bremsstrahlung scales as Pbrems ∝ Tₑ^½, capping Pfus/Pbrems at ~0.2–0.3 without non-thermal ion distributions.
- For MTF (General Fusion), liquid-metal vortex stability under pneumatic shock and synchronisation of dozens of pistons.
- For sheared-flow Z-pinch (Zap), maintaining kink-stability at commercial pulse repetition rates.
- Elimination of large superconducting magnet assemblies removes the single largest capex line in tokamaks.
- Direct-conversion architectures bypass the 35–40% Rankine/Brayton thermodynamic ceiling, pushing net plant efficiency past 60–70%.
- Liquid-metal first-walls (General Fusion) eliminate first-wall replacement cycles entirely.
Helion holds the industry's singular commercial benchmark — a binding Microsoft 50 MW PPA for 2028. D-³He fuel and direct induction allow compact, high-rep-rate modules suited to hyperscaler data-centre siting. General Fusion offers radical mechanical simplicity by replacing lasers and brittle superconductors with pistons, solving the neutron-wall problem via a rotating liquid-lithium barrier. Zap has demonstrated 1.6 GPa plasma pressure, suggesting magnet-free architectures may be the lowest-capex route.
Sourced from the 2026 Global Fusion Energy Comparison — triple-product physics, DEC architecture, and LCOE framework.
Who built Crossfield Fusion
Founded by James McKenzie, Crossfield Fusion is focused on achieving immediate, localized impacts using compact nuclear technology. McKenzie structured the company around an optimized, highly efficient variation of Inertial Electrostatic Confinement (IEC). By deliberately aiming away from massive, long-term grid plants, McKenzie's design targets immediate commercial markets—specifically, creating portable, low-cost fusion devices optimized for decentralized medical isotope production and advanced neutron radiography.
James McKenzie
Advanced engineering developer and industrial technology pioneer
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