# GTROTA: A code for the solution of the coupled nonlinear extended neoclassical rotation equations in tokamak plasmas using successive over-relaxation and simulated annealing

## Description

Abstract GTROTA (Georgia Tech ROTAtion) is a code that solves the extended neoclassical rotation equations for tokamak plasmas, derived from the multifluid moment equations (including electromagnetic effects) in generalized toroidal magnetic flux surface geometry. It computes the toroidal and poloidal fluid rotation velocities and the in–out and up–down density asymmetries at each radial location. The solution of these equations is accomplished iteratively, using a physically motivated decomposition, ... Title of program: GTROTAv1 Catalogue Id: AEPT_v1_0 Nature of problem Tokamak plasma rotation velocities and the poloidal in-out and up-down asymmetries of plasma densities are calculated from the coupled set of nonlinear equations, which shows a very instable iterative dynamics. To solve for the true solution for this nonlinearly coupled system that does not converge to a single solution, physics-based determination of the true solution becomes necessary and GTROTA provides the algorithm for users to find the true solution from the nonlinear topological maps. Versions of this program held in the CPC repository in Mendeley Data AEPT_v1_0; GTROTAv1; 10.1016/j.cpc.2013.06.006 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)