Fusion Fuel Reactivity Explorer (2D)

Not every fusion fuel burns the same. This simulator plots the Maxwellian-averaged reactivity ⟨σv⟩(T) for the four fuel cycles that matter for real reactors — deuterium-tritium, deuterium-deuterium, deuterium-helium-3 and aneutronic proton-boron-11 — as glowing log-log curves derived from each reaction's Gamow energy (computed from its actual reduced mass and charge product, not looked up from a table). Drag the temperature slider — or drag directly on the graph — and a marker slides along the selected curve while a plasma-core particle cloud brightens and pulses with the live fusion rate; the density and confinement-time sliders turn that reactivity into an actual power density and a Lawson triple product, showing why D-T dominates near-term reactors while p-¹¹B stays a distant, radiation-lean goal.