Effect of nonlinear energy transport on neoclassical tearing mode stability in tokamak plasmas
- Univ. of Texas, Austin, TX (United States). Dept. of Physics, Inst. of Fusion Studies
An investigation is made into the effect of the reduction in anomalous perpendicular electron heat transport inside the separatrix of a magnetic island chain associated with a neoclassical tearing mode in a tokamak plasma, due to the flattening of the electron temperature profile in this region, on the overall stability of the mode. The onset of the neoclassical tearing mode is governed by the ratio of the divergences of the parallel and perpendicular electron heat fluxes in the vicinity of the island chain. By increasing the degree of transport reduction, the onset of the mode, as the divergence ratio is gradually increased, can be made more and more abrupt. Eventually, when the degree of transport reduction passes a certain critical value, the onset of the neoclassical tearing mode becomes discontinuous. In other words, when some critical value of the divergence ratio is reached, there is a sudden bifurcation to a branch of neoclassical tearing mode solutions. Moreover, once this bifurcation has been triggered, the divergence ratio must be reduced by a substantial factor to trigger the inverse bifurcation.
- Research Organization:
- Univ. of Texas, Austin, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- FG02-04ER54742
- OSTI ID:
- 1535309
- Journal Information:
- Physics of Plasmas, Vol. 24, Issue 5; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Impact of neoclassical tearing mode–turbulence multi-scale interaction in global confinement degradation and magnetic island stability
|
journal | December 2017 |
Stabilization of a magnetic island by localized heating in a tokamak with stiff temperature profile
|
journal | February 2018 |
Real frequency tearing layers with parallel dynamics and the effect on error field locking and resistive wall modes
|
journal | October 2019 |
Non-linear simulations of neoclassical tearing mode control by externally driven RF current and heating, with application to ITER
|
journal | August 2019 |
Similar Records
Controlled neoclassical tearing mode (NTM) healing by fueling pellets and its impact on electron cyclotron current drive requirements for complete NTM stabilization
Helical temperature perturbations associated with tearing modes in tokamak plasmas