Mechanism of stabilization of ballooning modes by toroidal rotation shear in tokamaks |
| |
Authors: | Furukawa M Tokuda S |
| |
Institution: | Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka, Ibaraki 311-0193, Japan. furukawa@ppl.k.u-tokyo.ac.jp |
| |
Abstract: | A ballooning perturbation in a toroidally rotating tokamak is expanded by square-integrable eigenfunctions of an eigenvalue problem associated with ballooning modes in a static plasma. Especially a weight function is chosen such that the eigenvalue problem has only the discrete spectrum. The eigenvalues evolve in time owing to toroidal rotation shear, resulting in a countably infinite number of crossings among them. The crossings cause energy transfer from an unstable mode to the infinite number of stable modes; such transfer works as the stabilization mechanism of the ballooning mode. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|