Fusion Science and Technology / Volume 61 / Number 2T / February 2012 / Pages 113-121
Equilibrium and Instabilities / Proceedings of the Tenth Carolus Magnus Summer School on Plasma and Fusion Energy Physics
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.