Linear MHD stability studies of helically symmetric equilibria with HERA

Publisher Website
Google Scholar
Abstract
Helically symmetric equilibria without net longitudinal current and their linear MHD stability are studied with the HASE quasi-analytical equilibrium code and the HERA 2D spectral code. The modes investigated comprise low-m-number internal, external, high-m-number modes obtained with the large-k-number option of the HERA code and localized (k → ∞) ballooning modes. Stable straight Heliotron equilibria with beta up to <β> = 0.01 and stable straight Heliac equilibria with beta up to <β> = 0.29 are obtained. The correspondence between instability as obtained from the ballooning-mode equation in part of the plasma volume and from finite-k analysis is discussed.

This publication has 8 references indexed in Scilit: