the active blueprint

The architectural questions ARE the interface. Radiatively symmetric ⇒ 2D radial band-ladder, solved live per keystroke; effective per-band exchange, κ(line) monotonic in n₃ₚ occupation [ladder table]. Full 3D trace = offline physics check (precedent: 2.74 pred / 2.82 traced, 3%). v0 — gray-band [MODEL]; Kimi tables landing

alkali fuel power P_in [kW] inner tube bore ⌀ [mm] inner tube MATERIAL annulus gap [mm] outer tube ⌀ (quartz) — derived outer jacket hot mirror (contains H₂O-band radiation)

—suns on facet

—W_e (η 0.245 [EST])

—T inner tube [K]

—T outer tube [K]

—line escape → PV

—H₂O-band recycled

v0.1 solver [MODEL]: 4 bands · line escape/PV now interpolated on the r2-MEASURED κ-ladder (13/13 gates) (alkali line · NIR continuum · H₂O 2.7 µm · H₂O 6.3 µm), analytic coaxial-cylinder exchange, material Fresnel/α presets [T-family/EST], wall balance by bisection. Upgrades landing: κ(n₃ₚ) ladder + H₂O band tables + material sets (Kimi), MC check per config. Salt film: optically invisible (measured ≤0.03%) — not drawn as an optical element.

Blueprint is to scale from the parameters (section ⊥ axis). Dimensions in mm. Yellow core = driven line source S = B(λ,T)·e^(μ/kT), μ from the measured band [row18].

THE ACTIVE BLUEPRINT — twin-tube, parametric, live-solved