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Neoclassical Tearing Mode (NTM)

  • Marc Maraschek
Chapter
Part of the Springer Series on Atomic, Optical, and Plasma Physics book series (SSAOPP, volume 83)

Abstract

Neoclassically driven tearing modes (NTM) are a major problem for tokamaks operating in a conventional ELMy H-mode scenario. Depending on the mode numbers these pressure driven perturbations cause a mild to strong reduction in the plasma pressure, thus limiting the maximum achievable normalized plasma pressure \(\beta_N = \beta_t /(\frac{I_p}{a B_t})\) , or can even lead to disruptions at low edge safety factor, \(q_ {95}\). A control of such modes in high \(\beta_N\) plasmas is therefore of vital interest for tokamaks. The control consists of two major approaches, namely the avoidance of the excitation of these modes and the removal, or at least mitigation of the impact of these modes, if the avoidance did not succeed. For both routes examples will be given and the applicability of these approaches to ITER will be discussed.

Keywords

Current Drive Toroidal Field Island Size Electron Cyclotron Resonance Heating Confinement Loss 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Max Planck Institute for Plasma PhysicsGarchingGermany

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