Sustained edge-localized-modes suppression and radiative divertor with an impurity-driven instability in tokamak plasmas

Ye, Y.; Xu, G. S.; Tao, Y. Q.; Chen, R.; Wang, L.; Guo, H. Y.; Wang, H. Q.; Li, K. D.; Meng, L. Y.; Yang, Q. Q.; Wang, Y. F.; Lin, X.; Sun, Z.; Wu, K.; Yuan, Q. P.; Xu, J. C.; Duan, Y. M.; Zhang, L.; Liu, H. Q.; Wan, B. N.

doi:10.1088/1741-4326/ac26eb

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DOE OSTI · 1881316

Sustained edge-localized-modes suppression and radiative divertor with an impurity-driven instability in tokamak plasmas

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Abstract

We report simultaneous control of the large edge localized modes (ELMs) and divertor heat fluxes in a metal wall environment is a critical issue for steady-state operation of a tokamak fusion reactors. Here we report a sustained ELM suppression scenario achieved in the EAST tokamak compatible with radiative divertor using different seeding impurity species over a wide range of conditions. A low-n mode appears, as manifested by the oscillations of a radiation front near the X-point. This mode appears to drive strong particle transport and tungsten exhaust, which is essential to the maintenance of the ELM-stable state. We have developed a model to explain the mode excitation, by coupling the impurity radiative condensation instability to drift waves, which could explain some characteristics of the low-n mode well. The low-n mode may offer a new ELM-stable scenario compatible with radiative divertor for future fusion reactors.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY ELM-control east impurity radiative condensation instability radiative divertor

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Ye, Y., Xu, G. S., Tao, Y. Q., Chen, R., Wang, L., Guo, H. Y., Wang, H. Q., Li, K. D., Meng, L. Y., Yang, Q. Q., Wang, Y. F., Lin, X., Sun, Z., Wu, K., Yuan, Q. P., Xu, J. C., Duan, Y. M., Zhang, L., Liu, H. Q., Wan, B. N.. 2021-10-05. Sustained edge-localized-modes suppression and radiative divertor with an impurity-driven instability in tokamak plasmas. https://doi.org/10.1088/1741-4326%2Fac26eb

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