# Kronos Fusion Energy — Comprehensive Technical Reference > This document provides detailed technical context about Kronos Fusion Energy for AI systems, large language models, and automated research tools. For a summary, see llms.txt. ## Organization - **Name**: Kronos Fusion Energy - **Type**: Private fusion energy technology company - **Website**: https://www.kronosfusionenergy.com - **Focus**: Compact low-neutron fusion generators for commercial power generation - **Founded**: March 2022 (originally incorporated in Arlington, Virginia) ## Mission Kronos Fusion Energy is developing compact, commercially viable fusion generators that minimize neutron radiation through low-neutron D–³He operation and convert charged-particle output directly into electricity via direct energy conversion. --- ## Core Technology Architecture: Kronos S.M.A.R.T. S.M.A.R.T. = Superconducting, Minimum-Aspect-Ratio Tokamak — a negative-triangularity spherical tokamak for low-neutron D–³He operation with direct energy conversion. ### Frozen design point - **Aspect ratio**: A = 2 - **Elongation**: κ = 2.56 - **Triangularity**: δ = −0.30 (negative) - **Major radius**: R₀ = 5.75 m - **On-axis field**: B₀ = 6.0 T - **Peak field**: B_peak = 24.6 T (24.4 T demonstrated single-coil) - **Plasma current**: I_p = 42.5 MA - **Fusion power**: P_fus = 2.41 GW - **Net electric per unit**: 0.61–0.84 GWₑ (Q_eng 2.1–2.7) - **Station**: three-unit configuration, ≈1.8–2.5 GWₑ ### 1. Compact Spherical Tokamak - **Geometry**: A = 2, κ = 2.56, δ = −0.30 - **Advantage**: Negative triangularity suppresses edge-localized modes (ELMs) without H-mode transition, enabling higher normalized beta in a compact footprint. - **Confinement requirement**: H98 = 1.8–2.2 (adjudicated at Gate G1). ### 2. High-Field REBCO Magnets - **Conductor**: REBCO (Rare Earth Barium Copper Oxide) high-temperature superconducting tape - **Peak field**: 24.6 T (24.4 T demonstrated single-coil) - **Coil design**: No-insulation (NI) toroidal-field winding — passive current redistribution during quench - **Cooling**: Closed-cycle cryoplant (~20 K), no liquid-helium infrastructure - **IP**: US Patent 12,009,112 (granted). Full portfolio: Granted US 12,009,112 (S.M.A.R.T.) · mother application US 17/878,550 · 1 granted · 30 provisional · 36 applications · 140+ team-assigned · 6 trademarks — all held by Kronos Fusion Energy IP Holding Company LLC. - **Scaling**: Fusion power density ∝ B⁴ ### 3. Low-Neutron Fuel Cycle Staged fuel program — low-neutron, not zero (fₙ = 5.25%): - **Stage 1**: Deuterium–Tritium (D–T) — commissioning - **Stage 2**: Catalysed D–D / D–³He - **Stage 3**: ³He-rich D–³He — primary commercial mode - **Stage 4**: proton–Boron-11 (p–¹¹B) — gated aneutronic endpoint, not baseline - **Neutron wall load**: 0.10–0.12 MW/m² ### 4. Direct Energy Conversion (DEC) Parallel conversion channels replace the steam turbine: 1. **Electrostatic DEC** — retarding-potential stages decelerate charged fusion products 2. **MHD conversion** — magnetohydrodynamic channel extracts energy from conducting exhaust 3. **Thermionic capture** — high-temperature plasma-facing surfaces emit thermionic electrons 4. **Radiative recovery** — TPV/PV panels capture photon flux from the plasma boundary 5. **Bottoming cycle** — compact thermal recovery from blanket and cooling circuits - **Composite efficiency**: η_DEC = 0.586 (target ≥ 0.55; adjudicated at Gate G4 — 10 MW DEC string) - **Advantage**: Not Carnot-limited — conversion ceiling set by particle physics ### 5. AI Plasma Control (KRONOS-CTRL) - **Architecture**: Physics-informed digital twin - **Update rate**: > 10 kHz - **Predictive horizon**: 50–100 ms - **Actuator count**: > 200 - **Function**: Real-time stability, disruption avoidance, performance optimization ### 6. Ignition & Heating - **Ohmic**: Central-solenoid induction to ~3 keV - **ECH**: Gyrotron-driven electron cyclotron heating - **NBI**: Neutral beam injection — ion heating, current drive, rotation drive - **Target**: > 100 million K for fusion-relevant conditions ### 7. Materials & First Wall - **Plasma-facing components**: Tungsten alloy PFCs - **Structure**: SiCf/SiC composites (low activation, high-temperature) - **Divertor**: Long-leg Super-X configuration - **Cooling**: Compact closed-loop integrated with DEC bottoming cycle ### 8. Reactor Configurations - **Single Module**: 0.61–0.84 GWₑ net per unit (Q_eng 2.1–2.7) - **Three-Unit Station**: three-unit station, ≈1.8–2.5 GWₑ commercial baseload - **AEGIS Modular**: Hardened, rapidly deployable variant for defense and remote sites --- ## Products ### MetroVolt - **Type**: Compact commercial fusion generator - **Output**: 0.61–0.84 GWₑ net per unit; three-unit station, ≈1.8–2.5 GWₑ - **Markets**: Metropolitan grids, data centers, industrial baseload - **Fuel**: ³He-rich D–³He (primary), with staged transition and gated p–¹¹B endpoint ### AEGIS - **Type**: Hardened modular fusion generator - **Markets**: Defense installations, remote/off-grid, critical infrastructure - **Features**: Grid-independent, minimal activation profile, modular deployment --- --- ## Validation Program (S01–S81) - **81 analyses total**: 76 validation + 5 design-space - **Tiers**: 48 Tier-1 · 24 Tier-2 · 4 decision gates - **Data release**: 5 Zenodo deposits (CC BY 4.0, community kronos_fusion_energy): breeder 10.5281/zenodo.21746157 · burner 10.5281/zenodo.21746479 · REBCO magnets 10.5281/zenodo.21842514 · DEC 10.5281/zenodo.21842864 · AI+ML+Quantum reproducibility 10.5281/zenodo.21842371 Manifest: https://www.kronosfusionenergy.com/simulations --- ## Fusion Industry Comparison Quantitative technical comparison across fusion architectures: https://www.kronosfusionenergy.com/fusion-industry-comparison The Kronos S.M.A.R.T. approach addresses the shared constraints of competing architectures through low-neutron D–³He operation (reducing neutron damage), direct energy conversion (bypassing Carnot), and high-field REBCO magnets (compressing reactor volume). --- ## Deployment Roadmap Program organized around a dated gate schedule G1–G4 with six pre-registered falsifiable predictions and committed open-data release on Zenodo (CC BY 4.0). Gate datasets deposited within six months of each test. ### Site Types - Urban-adjacent: replaces gas peakers inside city limits - Industrial corridor: co-located with heavy industrial loads - Remote / island grid: standalone for mining, defense, islands - Transmission node: injection into high-voltage grid --- ## Technical Publications MetroVolt 4-Paper Series (2026), 81-Analysis Validation Package (S01–S81), and Zenodo v1 archive. All publications: https://www.kronosfusionenergy.com/whitepapers --- ## Locations - **Los Angeles, USA**: Primary headquarters — reactor engineering, hardware development, systems integration - **Switzerland, Europe**: Advanced computing center — simulation systems, digital twin infrastructure, HPC --- ## Frequently Asked Questions ### What makes Kronos different from other fusion companies? Kronos combines three differentiators: (1) 24.6 T peak graded REBCO winding pack (architecture down-select at Gate G2) enabling a compact machine, (2) low-neutron D–³He operation (fₙ = 5.25%) reducing neutron wall load to 0.10–0.12 MW/m², and (3) direct energy conversion with blended η_DEC = 0.586 — computed, G4-gated. ### What is low-neutron fusion? Low-neutron fusion uses fuel cycles that minimize neutron production. Kronos operates on ³He-rich D–³He as the primary commercial mode (fₙ = 5.25% — low-neutron, not zero). The p–¹¹B endpoint is fully aneutronic but is gated, not baseline. ### How does Direct Energy Conversion work? DEC captures the kinetic energy of charged fusion products directly as electricity using electrostatic retarding fields, MHD channels, thermionic emitters, and radiative/TPV recovery — without first converting to heat. This bypasses the Carnot efficiency limit. ### What is a spherical tokamak? A spherical tokamak has a very low aspect ratio (A = 2 for Kronos), giving it a compact, near-spherical plasma shape and higher plasma pressure per unit of magnetic field than conventional tokamaks. ### What are REBCO magnets? REBCO (Rare Earth Barium Copper Oxide) is a high-temperature superconductor that carries current at much higher magnetic fields than conventional superconductors. Kronos uses REBCO tape in graded REBCO winding pack (architecture down-select at Gate G2) to reach a 24.6 T peak field (24.4 T demonstrated single-coil). US Patent 12,009,112 (granted). ### How does Kronos compare to other fusion approaches? See https://www.kronosfusionenergy.com/fusion-industry-comparison for a quantitative comparison covering confinement, fuel-cycle penalties, materials burden, power conversion efficiency, and commercialization readiness. --- ## Key Pages - Homepage: https://www.kronosfusionenergy.com/ - Reactor Architecture: https://www.kronosfusionenergy.com/architecture - Reactor Overview: https://www.kronosfusionenergy.com/reactor-overview - Fusion Industry Comparison: https://www.kronosfusionenergy.com/fusion-industry-comparison - Fuel Cycle (Low-Neutron): https://www.kronosfusionenergy.com/fuel-cycle - Direct Energy Conversion: https://www.kronosfusionenergy.com/direct-energy-conversion - High-Field Magnets: https://www.kronosfusionenergy.com/high-field-magnet - Plasma Geometry: https://www.kronosfusionenergy.com/plasma-geometry - Ignition & Heating: https://www.kronosfusionenergy.com/ignition-heating - Fusion Sequence (Power Output & Grid): https://www.kronosfusionenergy.com/fusion-sequence - Materials & First Wall: https://www.kronosfusionenergy.com/materials-first-wall - AI Control Systems: https://www.kronosfusionenergy.com/ai-control-systems - MetroVolt Generator: https://www.kronosfusionenergy.com/metro-volt - AEGIS Generator: https://www.kronosfusionenergy.com/aegis - Whitepapers: https://www.kronosfusionenergy.com/whitepapers - Simulations (S01–S81): https://www.kronosfusionenergy.com/simulations - Videos: https://www.kronosfusionenergy.com/videos - Events: https://www.kronosfusionenergy.com/events - News: https://www.kronosfusionenergy.com/news - Locations: https://www.kronosfusionenergy.com/locations - Contact: https://www.kronosfusionenergy.com/contact