Instrument 1 of 4 · S01 · KX1 · S26

The frozen burn point.

This is the profile-integrated 0-D burn engine from the deposit (KX1_burn_engine.py + the frozen Mode-C reconciliation), running on the frozen machine: R₀ 5.75 m, A = 2.0, κ 2.56, B₀ 6.0 T, I_p 42.5 MA. Move the three knobs the plasma actually cares about; everything downstream — fusion power, neutron fraction, wall load, required confinement — recomputes from the Bosch–Hale integrals, live.

starting …

Core ion temp T_i0 65 keV

Line-avg density n̄_e 1.90 ×10²⁰

³He fuel-ion share 20 % (80:20)

The 80:20 point is the frozen commercial baseline (Stage 1a); the 2:1 mix (share 33 %) is the later-stage schedule. Both are deposited cases.

Fusion power

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MW · hot-ion ceiling

Neutron fraction

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% of P_fus

Neutron wall load

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MW/m²

Bremsstrahlung

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Required H₉₈

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IPB98(y,2)

β_N

—

Troyon

Greenwald frac

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f_GW

Read the badges honestly The 2.41 GW at the frozen point is a hot-ion ceiling — holding Ti/Te ≈ 1.9 is adjudicated by the S26 gate and is one of the paper's two stated feasibility gaps; the near-thermal baseline is ≈1.5 GW. The badges flip when you leave the deposited envelope: β_N > 5.0 (the wall-stabilized S79 limit), f_GW > 1.3, or a required H₉₈ beyond the stated 1.8–2.2 band. Source: the deposit — paper1/frozen_modeC_reconciliation.py, DOI 10.5281/zenodo.21248916.

The writeup

The plain-language paper behind this instrument: The Frozen Point — One Operating Point, Zero Moving Goalposts · Not a Knife-Edge: MetroVolt’s Operating Window.

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