Nonlinear evolution of the double tearing instability
In recent years, many tokamak experiments have shown evidence for transport barriers in regions of negative magnetic shear. However, the control of the parameters of such discharges is a difficult task and the evolution of a configuration of this type may lead to instabilities due to presence of multiple rational surfaces in the plasma. In particular, the double tearing instability may affect the confinement, since it may lead to relaxations of the electron temperature. The present work is part of a systematic investigation of the stability and nonlinear evolution of the double tearing instability. Its aim is to analyse more precisely the structure of the nonlinear solutions of the magnetohydrodynamics (MHD) equations, studying the properties of stationary saturated double tearing modes and the structure of oscillatory solutions which bifurcate from a stationary nonlinear solution.
Bibliographic Reference: Report: EUR-CEA-FC-1620 EN (1998) 23pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez-Durance (FR)
Record Number: 199810329 / Last updated on: 1998-03-09
Original language: en
Available languages: en