IFS Seminar

Abstract: 

This publication describes the DCON3D code for determination of the ideal MHD stability of stellarators with nested flux surfaces. The direct criterion of Newcomb was originally presented for one-dimensional cylindrical screw-pinch equilibria depending only on cylindrical radius r. It was extended with the DCON code to two-dimensional axisymmetric tokamak equilibria depending on toroidal flux coordinates ðw; hÞ. This work further extends the approach to nonaxisymmetric stellarator equilibria with nested flux surfaces, depending on toroidal flux coordinates ðq; h; fÞ. It provides a very fast and accurate method to determine the existence of instabilities without the need to compute eigenvalues and eigenfunctions.