Engineering Architecture of the Stochastic Adaptive Spheromak Reactor (SASR)

The commercial viability of magnetic confinement fusion is currently bottlenecked by the engineering complexities of legacy Deuterium-Tritium (D-T) tokamak architectures, specifically their reliance on massive superconducting coils, tritium-breeding blankets, and inefficient thermal steam cycles. This paper presents the comprehensive engineering architecture for the Stochastic Adaptive Spheromak Reactor (SASR), a compact, high-field (>12 T) system optimized for the aneutronic proton-boron (p-11B) fuel cycle. Operating in a severe thermodynamic disequilibrium (Ti >> Te)driven by an active Alfvénic Hammer, the SASR sustains a 5 GW thermal output. While the topological stability and kinetic viability of this non-equilibrium “Cooling Race” were established in preceding works, translating this pulsed micro-chronology into a continuous commercial power cycle presents unique engineering challenges. By calculating the kinetic margin thresholds for the Alfvénic heating pulse (τH) across D-T, D-3He, and p-11B fuels, we establish the rigid operational boundaries required to guarantee collisionless ion-heating via magnetic reconnection events and sustain the“Cooling Race”. We mathematically define the macroscopic fueling requirements (1.43 g/s) and establish a strict > 2.9 km/s velocity threshold for macroscopic cryogenic decaborane pellet injection to bypass the 70 μs active reconnection pulse at SASR’s radius a = 0.9 m. Exhaust is managed volumetrically via an Active Helicity Edge Divertor (AHED), which utilizes Coaxial Helicity Injection (CHI) and real-time embedded RF diagnostic feedback to actively maintain a sub-critical stochastic boundary layer (Chirikov parameter S ≈ 0.9). The expanding exhaust is decelerated through a 1.45 MV Venetian-Blind Direct Energy Conversion (DEC) array, capturing the 8.7 MeV alpha-particle yield directly as grid-ready High-Voltage Direct Current (HVDC). A Capillary Porous System(CPS) flowing liquid lithium first wall mitigates Bremsstrahlung radiation damage and high-Z impurity sputtering, while thermally shielding a highly conductive oxygen-free copper flux conserver that provides critical passive Magnetohydrodynamic (MHD) stabilization against macroscopic tilt and shift modes. By eliminating the steam island and massive external magnetic coils, the SASR achieves a projected Capital Expenditure (CAPEX) of $4.5 Billion for a 3 GWe baseload plant, yielding a highly disruptive 4.6-year Return on Investment (ROI).