Fusion diagnostics
Software revenue funds independent IEC / fusor diagnostics and computation. The physics stays free; paid seats buy artifacts you can hand in. These tools are free. Bosch–Hale and Child–Langmuir are named formulas. IEC yield is a pedagogical beam-target estimate — not a device prediction.
Bosch–Hale ⟨σv⟩
DT, DD, D-³He thermal reactivity
Child–Langmuir
Planar space-charge-limited J(V,d)
Coulomb barrier
V = Z1 Z2 e² / (4πε0 R)
IEC / fusor yield
Beam-target order-of-magnitude (toy)
What this is not
Not a neutron-survey code, not MHD, not a spherical-grid Poisson solver. If a number would be wrong for a homework or a lab notebook, the kernel throws or is labeled toy.