Impurity radiation seeding of neoclassical tearing mode growth

Zeng, Shiyong; Zhu, Ping; Howell, Eric C.

doi:10.1088/1741-4326/adc288

Impurity radiation seeding of neoclassical tearing mode growth

Journal Article · Mon Mar 31 00:00:00 EDT 2025 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/adc288· OSTI ID:2544400

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Abstract

The physics of neoclassical tearing modes (NTMs) is of great concern to tokamak plasma stability and performance, especially in the burning plasma regime. Whereas in many situations the seed events can be clearly identified, such as sawteeth and edge localized modes, the potential seeding mechanism of NTMs due to the resistive tearing instability driven by the impurity radiation cooling still needs more study. Recent NIMROD simulations have demonstrated that local impurity radiation cooling can drive the seed island growth and trigger the subsequent onset of NTM instability. The seed island is mainly driven by the local helical perturbation of the diamagnetic current induced by the perturbed pressure gradient as a result of the impurity radiative cooling on the rational surface. A heuristic closure for the neoclassical viscosity is adopted, and the seed island is further driven by the perturbed bootstrap current induced from the neoclassical electron viscous stress in the extended Ohm’s law. The growth rate of the NTM in simulations is found proportional to the electron neoclassical viscosity, and a theoretical neoclassical driving term is adopted to account for the nonlinear neoclassical island growth in the simulations.

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Sponsoring Organization:: USDOE

OSTI ID:: 2544400

Alternate ID(s):: OSTI ID: 2532460

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 5 Vol. 65; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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Impurity radiation seeding of neoclassical tearing mode growth

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Impurity radiation seeding of neoclassical tearing mode growth

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