DOAJ Open Access 2022

Triggering of tearing instability by impurity radiation through resistive interchange reversal in a tokamak

Shiyong Zeng Ping Zhu Ruijie Zhou Dominique Frank Escande

Abstrak

Recent MHD simulations find that the reversal of the local resistive interchange parameter $D_\mathrm{R}$ from negative to positive due to impurity radiation cooling is able to linearly destabilize the resistive tearing mode (TM) growth in a tokamak above a threshold in impurity level. A layer of perturbed Pfirsch–Schlüter current density and resistivity are also induced by the impurity radiation, which further govern the TM growth and saturation in the nonlinear stage. The impurity threshold and the TM growth strongly depend on the parallel thermal conductivity, and such a dependence derives from the impact on $D_\mathrm{R}$ of the fast parallel thermal equilibration along the helical magnetic field lines.

Topik & Kata Kunci

Nuclear and particle physics. Atomic energy. Radioactivity

Penulis (4)

Shiyong Zeng

Ping Zhu

Ruijie Zhou

Dominique Frank Escande

Format Sitasi

APA MLA BibTeX

Zeng, S., Zhu, P., Zhou, R., Escande, D.F. (2022). Triggering of tearing instability by impurity radiation through resistive interchange reversal in a tokamak. https://doi.org/10.1088/1741-4326/aca687

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Informasi Jurnal

Tahun Terbit: 2022
Sumber Database: DOAJ
DOI: 10.1088/1741-4326/aca687
Akses: Open Access ✓