Glossary of Terms

\(T_i\): Ion temperature

\(T_e\): Electron temperature

\(n_e\): electron density

\(\psi\): poloidal flux

\(\hat{\rho}\): The normalized toroidal flux coordinate. used as the radial coordinate in the TORAX 1D mesh.

\(\hat{\rho}\) is a flux surface label, being constant on a closed surface of magnetic flux. The toroidal flux coordinate is defined as \(\rho=\sqrt{\frac{\Phi}{\pi B}}\), where \(\Phi\) is the toroidal magnetic flux enclosed by the magnetic flux surface being labelled. \(B\) is the magnetic field at the magnetic axis. The \(\hat{\rho}=\rho/\rho_{LCFS}\), where \(\rho_{LCFS}\) is the toroidal flux coordinate at the last-closed-flux-surface, in units of meters.

evolving profiles: core_profile variables (\(T_i\), \(T_e\), \(n_e\), \(\psi\)) which are evolved by the PDE, as determined in the numerics configuration (see Simulation input configuration).

prescribed profiles: core_profile variables that are not being evolved by the PDE, but have time-dependent variables in the profile_conditions configuration (see Simulation input configuration) that determine their values throughout the simulation.

runtime parameters: configuration variables that are inputs to the simulation. Some of these are time-dependent, and some are not.