Empirical disproof of linear-response
Standard plasma physics expects an L-H transition: turbulent flows generate shear, shear suppresses turbulence — a linear-response feedback loop with a discrete threshold.
This widget shows what the Tokamak architecture does instead. Above a low drive threshold, the accumulator saturates and the system snaps into a fixed geometric attractor set by the underlying safety-factor profile, not by the input. Push the drive harder once locked — nothing changes. The system stops responding to the input.
Target Mode m ≈ q₀ + q₁ / 2