Deep Dive: The Multi-Modal DEC Train

Kronos layers four conversion modes — direct charged-particle, MHD, thermionic, and photonic — to reach a blended, gate-adjudicated efficiency without betting on one method.

CPDC (S16)

Charged-particle direct converter

MHD (S17)

Plasma-exhaust MHD generator

Thermionic (S18)

Solid-state heat-to-electricity

Photonic (S19)

Radiation capture

Rather than rely on a single conversion method, Kronos MetroVolt uses a multi-modal direct-energy-conversion train — a sequence of complementary stages, each catching a different slice of the fusion energy, deposited and analyzed individually.

• Charged-particle direct converter (S16) — decelerates protons and alphas against a collector to recover their energy directly.
• Plasma-exhaust MHD generator (S17) — extracts power from the flowing conducting exhaust, no moving parts.
• Thermionic conversion (S18) — a solid-state stage turning high-temperature heat into electricity.
• Photonic capture (S19) — recovers energy from the plasma's bremsstrahlung and synchrotron radiation.

Because the modes are complementary, the design quotes a blended, gate-adjudicated efficiency rather than betting everything on one method — and the overall optimum is ³He-rich (η ≈ 0.60), not the aneutronic endpoint (analysis S71). Layering modes is also what keeps each mode's assumptions individually checkable.