ORMEC: A three-dimensional MHD spectral inverse equilibrium code

The Oak Ridge Moments Equilibrium Code (ORMEC) is an efficient computer code that has been developed to calculate three-dimensional MHD equilibria using the inverse spectral method. The fixed boundary formulation, which is based on a variational principle for the spectral coefficients (moments) of the cylindrical coordinates R and Z, is described and compared with the finite difference code BETA developed by Bauer, Betancourt, and Garabedian. Calculations for Heliotron, Wendelstein VIIA, and ATF configurations are performed to establish the accuracy and mesh convergence properties for the spectral method