A singular finite element technique for calculating continuum damping of   Alfv\'en eigenmodes
  Damping due to continuum resonances can be calculated using dissipation-less ideal magnetohydrodynamics (MHD) provided that the poles due to these resonances are properly treated. We describe a singular finite element technique for calculating the continuum damping of Alfv\'{e}n waves. A Frobenius expansion is used to determine appropriate finite element basis functions on an inner region surrounding a pole due to the continuum resonance. The location of the pole due to the continuum resonance and mode frequency are calculated iteratively using a Galerkin method. This method is used to find the complex frequency and mode structure of a toroidicity-induced Alfv\'{e}n eigenmode (TAE) in a large aspect ratio circular tokamak and are shown to agree closely with a complex contour technique. 
George W. Bowden and Matthew J. Hole
physics.plasm-ph