Pre-Registered Prediction: Magnet Field

The breeder predicts a peak field of 16.84 T with 8 T on-axis and states the tolerance a magnetic measurement must meet, testing the magnet design directly.

The prediction

The breeder (Hyperion) relies on high-temperature-superconducting magnets to produce a peak field of 16.84 T at the conductor and 8 T on-axis at the plasma. These fields are prerequisites for the plasma current of 9.66 MA and the confinement behind Q_sci 3.076. The record pre-registers the predicted field values and profile.

The falsifier

A measured on-axis field below 8 T beyond tolerance, or a peak conductor field that cannot reach 16.84 T without exceeding the magnet's stress or quench limits, refutes the magnet operating point as designed. This is a comparatively direct test: the field is measurable with standard magnetic diagnostics early in commissioning, before plasma operation.

# Pre-registered field test (schematic)
B_axis_pred = 8.0     # T on-axis
B_peak_pred = 16.84   # T at conductor
def verdict(B_axis, B_peak, tol=0.05):
    ok = (abs(B_axis-B_axis_pred) <= tol*B_axis_pred and
          B_peak <= B_peak_pred*(1+tol))
    return 'field confirmed' if ok else 'REFUTED: magnet point'

An early, clean test

Because magnet fields can be verified before first plasma, this prediction is among the earliest to resolve. Confirming it de-risks a large block of downstream physics that assumes the design field; failing it forces a redesign before plasma operation rather than after.

This page describes a design-and-simulation study, not a built machine. Construction of the breeder (Hyperion) begins Q2 2027; first-of-a-kind first tritium is targeted near 2030. No hardware net-gain claim is made before FOAK.