VEQ: a fast parametric Grad--Shafranov solver for fixed-boundary tokamak equilibria with flexible source profiles

Researchers have developed Veloce EQuilibrium (VEQ), a fast parametric framework designed for tokamak modeling workflows that require frequent, low-latency computation of fixed-boundary equilibria.

The VEQPy implementation is an axisymmetric fixed-boundary Grad-Shafranov solver utilizing a variationally induced projected residual. It employs flux-surface harmonics and shifted-Chebyshev coefficients for profile and source closures.

VEQ offers six input routes for pressure-gradient, toroidal field function, poloidal flux gradient, enclosed toroidal current, current density, and safety factor information, all mapping to a single residual operator, demonstrating route consistency in tests.