Pick an input — h, I, amax, f, Nr, Nt — set a range, and the solver returns a JSON array of pre-computed field snapshots. The bar-chart UI animates k against the swept axis as frames roll in.
Every tunable that the calculator exposes is sweepable: spacing h (most common), excitation current I, coil size amax, turn counts Nr and Nt, frequency f, and the offset triplet (xt, yt, zt).
The 6.78 MHz ISM band and the 85 kHz SAE J2954 EV-charging band ship as one-click presets. Custom frequencies up to 1 THz are accepted; the field tensor is recomputed per frame, not interpolated.
The SweepRequest endpoint returns frames as a JSON array — field snapshots, time-series and aggregated metrics together. The web UI renders a scrubber and animated bar chart; scripted clients can post-process the same payload.
