Every calculation in this model, documented in the open — what it does, the method, its inputs and outputs, where it runs, and how confident we are. This is the logic behind the numbers; the exact code lives in the open deposits. Pairs with Governing Physics ↗ and Methodology ↗.
0-D power-balance evaluator (breeder)PLASMA & SYSTEMSVALIDATEDIn-browser (Pyodide)
Solves the coupled confinement + fusion-reactivity + power balance for the breeder design point.
METHOD · Zero-dimensional systems model (dt_evaluator.py + kronos_clean.py, pure NumPy). Fusion power from ⟨σv⟩ reactivity; heating/loss balance sets τ_E and Q.
R₀, a, κ, B₀, Ti₀, nₑ, H₉₈, TBR → Q, P_fus, P_n, I_p, β_N, τ_E, T (kg/yr)
Confinement scaling (IPB98(y,2) · H₉₈)PLASMA & SYSTEMSSOURCEDIn-browser (live)
Sets energy confinement time from the standard tokamak scaling law, scaled by the H₉₈ factor.
METHOD · τ_E = H₉₈ · τ_IPB98(I_p, B, n, P, R, a, κ, A). H₉₈ is the design's largest single uncertainty.
I_p, B, n, P_heat, geometry → τ_E
Bootstrap current fractionPLASMA & SYSTEMSREDUCED-ORDERPrecomputed (frozen)
Splits plasma current into self-driven (bootstrap) and externally driven parts.
METHOD · I_p = I_bootstrap + I_driven (frozen: 1.50 + 8.36 MA, f_bs ≈ 0.152) from the pressure profile.
pressure profile, β → f_bs, I_driven
Stability / β gatePLASMA & SYSTEMSSOURCEDIn-browser (live)
Feasibility gate on plasma pressure.
METHOD · β_N < 4.2 (no-wall NSTX limit) combined with damage-life and coil limits as the "closes" criterion.
β_N, B_peak, T (dpa-life) → closes / does-not-close
Burner closure / operating windowPLASMA & SYSTEMSREDUCED-ORDERPrecomputed (frozen)
Determines whether the D–³He burner produces net power and how much.
METHOD · Power ledger with DEC recovery over the fuel trajectory; Q_E and f_n vs x(³He), Ti, nₑ. Closure crosses ~x0.44.
x(³He), Ti, nₑ, B_throat → Q_E, f_n, net MWe
Plug-density requirement (Frank Eq. 3.4)PLASMA & SYSTEMSREQUIREMENTPrecomputed (frozen)
The binding condition for burner net power.
METHOD · φ_i = T_e · ln(n_p/n_c); net power requires plug-to-central density ratio n_p/n_c ≈ 16. A requirement, not a solved result.
T_e, target confining potential → required n_p/n_c
Design-space scanDESIGN EXPLORATIONVALIDATEDPrecomputed (frozen)
Maps performance and feasibility across the whole design space.
METHOD · 25,201-configuration grid evaluated through the real 0-D evaluator; each point tagged by gate closure and fuel.
grid over I_p, B, Ti, n, … → Q / P_fus / closes per config
Monte-Carlo uncertainty (UQ)DESIGN EXPLORATIONVALIDATEDPrecomputed (frozen)
Propagates input uncertainty to the headline outputs.
METHOD · 2,000-sample Monte-Carlo over H₉₈, Ti₀, f_He4, f_G, TBR through the real evaluator → distributions and P(Q ≥ target).
input distributions → output PDFs, feasibility probabilities
Sensitivity / tornado rankingDESIGN EXPLORATIONREDUCED-ORDERIn-browser (live)
Ranks which inputs move the answer most.
METHOD · One-at-a-time swing analysis of |ΔQ| across the input ranges; H₉₈ dominates the spread.
input ranges → ranked sensitivities
Agentic what-if searchDESIGN EXPLORATIONREDUCED-ORDERIn-browser (live)
Finds the smallest change that hits a performance goal while staying feasible.
METHOD · Search over levers (H₉₈, B₀, Ti₀) calling the real evaluator; returns the minimal gate-preserving change to hit e.g. "+20% Q".
goal + allowed levers → lever, value, recomputed result, gate
REBCO J_c(B,T) scalingMAGNETS & MATERIALSPUBLIC-DATAPrecomputed (frozen)
Critical current density of the superconductor vs field.
METHOD · Power-law B-scaling anchored to public 20 T tape data, with layer-geometry conversion to superconductor J_c (17.59→6.66 MA/cm² over 5→20 T at 4.2 K).
B, T, tape geometry → J_c, engineering J_e
Winding-pack rule-of-mixtures (λ)MAGNETS & MATERIALSDESIGNPrecomputed (frozen)
Effective structural/electrical properties of the conductor stack.
METHOD · Volume-fraction weighting across REBCO (1.34%), Cu, Hastelloy, MP35N co-wind and insulation.
layer fractions & properties → effective allowable, λ_sc
Bore-resolved hoop stressMAGNETS & MATERIALSCOMPUTED (refutes field-only)Precomputed (frozen)
Structural stress in the high-field plug coil.
METHOD · σ(bore) from magnetic pressure with a reinforced rule-of-mixtures allowable. 87–350 MPa across the swept bore — under the 1091 MPa allowable, refuting the naïve field-only scaling (~1047 MPa).
B, J_wp, bore, reinforcement → σ_bore vs allowable
Quench protection (adiabatic MIITs)MAGNETS & MATERIALSDESIGN (benchmarked)Precomputed (frozen)
Peak temperature during a magnet quench.
METHOD · Current-divider adiabatic MIITs (∫J²dt) with contact-resistance retention fraction; self-protecting, benchmarked to Suetomi 2021 (reproduces 330 K).
stored energy, ρ_ct, geometry → T_max, V_terminal, τ_dump
Fatigue life (Basquin + Goodman)MAGNETS & MATERIALSINFEASIBLEPrecomputed (frozen)
Cyclic survival of the plug winding pack.
METHOD · S-N fatigue with Goodman mean-stress correction on layer-resolved FEA hoop stress. At operating field N_cycles ≪ design cycles → INFEASIBLE (the binding magnet gate).
σ_max, R, S-N constants → N_cycles vs design cycles
Magnet neutron lifetimeMAGNETS & MATERIALSDESIGN-STUDYPrecomputed (frozen)
Coil life under fusion-neutron fluence vs shielding.
METHOD · life = life₀ · exp(Σ_R · t) as a function of tungsten shield thickness; 15 cm W → ~0.56 FPY (below the 2 FPY target).
shield thickness, Σ_R, fluence → lifetime (FPY)
Direct energy conversion (ion-only)ENERGY CONVERSIONSOURCEDPrecomputed (frozen)
Converts charged-particle energy to electricity without a steam cycle.
METHOD · Ion-only DEC recovery efficiency (η ≈ 0.70) applied to the escaping charged-particle power — key to the low-neutron burner.
charged-particle spectrum → recovered electric power
Grounded retrieval (Ask-the-Twin)INTELLIGENCEREDUCED-ORDERIn-browser (live)
Answers questions only from the cited corpus.
METHOD · Lexical token-overlap scoring over machine-tagged chunks; answers above a ≥2 threshold with a citation, otherwise declines. Honest: lexical, not neural embeddings.
question, machine → answer + DOI citation (or decline)
Anomaly detection (digital shadow)INTELLIGENCEREDUCED-ORDERIn-browser (live)
Flags off-nominal behaviour in the telemetry stream.
METHOD · Rolling mean ± 3.2σ over a windowed baseline (excludes the recent window); step faults trigger an anomaly flag.
telemetry stream → σ-score, anomaly flag
Two-tier verificationREPRODUCIBILITYVALIDATEDHPC / local (declared)
Proves every result regenerates from the open record.
METHOD · Tier-1 byte-identical (md5) for deterministic outputs + Tier-2 tolerance (relative-diff) for floating-point; 182/182 checks pass.
deposit code + data → pass/fail per check
Quantum proof-of-concept + resource estimateINTELLIGENCEREDUCED-ORDERHPC port (declared)
Honest assessment of quantum advantage for the workload.
METHOD · Reproducible quantum PoC with a classical-vs-quantum resource estimate. Verdict: no crossover this decade — classical methods win today.
problem instance → resource estimate, verdict