Fusion Science and Technology / Volume 49 / Number 2T / February 2006 / Pages 155-163
Technical Paper / Plasma and Fusion Energy Physics - Equilibrium and Instabilities
Tearing modes often limit the performance of tokamak plasmas, because the magnetic islands which they generate lead to a loss of confinement, or even a disruption. A particularly dangerous instability is the neoclassical tearing mode, which can grow to a large amplitude because of the amplification effect that the bootstrap current has on an initial 'seed' magnetic island. This paper will address the mechanisms which dominate the neoclassical tearing mode evolution, and thereby identify possible control techniques.