Units and Scale in the Model
The model uses SI units throughout, with a persistent scale reference so components never lose their true size.
One unit system
Every measurement in the model is SI. Machine envelopes and coil positions are in meters, wall and blanket layers in millimeters, magnetic fields in tesla, currents in mega-amperes, and temperatures in kelvin where cryogenics are involved. There is no imperial fallback, which keeps callouts directly comparable to the design papers.
The persistent scale reference
A scale bar and a human-height reference stay in the scene at all zoom levels. This matters more than it sounds: a spherical tokamak and a tandem mirror look superficially similar in a cropped render, but they differ greatly in proportion. The reference keeps the compact, low-aspect-ratio character of Hyperion and the long linear character of the burner honest.
Reading a layer callout
- First wall and blanket thicknesses are shown in millimeters at the cut face.
- Coil bore and machine radii are shown in meters.
- Fields such as 16.84 T peak and 8 T on axis appear in tesla against the conductor and the plasma centerline respectively.
Precision and rounding
Callouts show the precision the design record carries. A field quoted as 26.49 T for the burner plug is shown to that precision because the design study resolves it; an envelope dimension may be shown to the nearest tenth of a meter because that is the meaningful figure at the machine scale. The model does not invent significant digits.
Scale honesty
Because the geometry is the design geometry, apparent size in the scene is true relative size. See Coordinate Systems for how positions are measured, and The Physics-Computable Model for where the numbers come from.