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Spatial–Temporal Properties of Current-Convective Turbulence in Divertor Plasma under DIII-D-Like Detached Conditions

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Abstract

Recent experimental observations of divertor plasma turbulence at the ASDEX Upgrade tokamak have demonstrated the onset of strong fluctuations of plasma radiation intensity in the near X-point region within the inner divertor leg, when the machine was operating with the pronounced asymmetry in detachment of plasma between the inner and outer divertors. As been recently shown, one of the possible mechanisms responsible for these fluctuations can be related to the current-convective instability (CCI). In this contribution, we assess whether the CCI can drive turbulence with spatial and temporal parameters similar to those observed lately in DIII-D experiments. It is demonstrated that the CCI drives saturated plasma fluctuations, dominated by low-frequency modes with toroidal wavelengths on the order of the machine circumference in the inner divertor region—features that are similar to turbulence characteristics found in experiments.

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ACKNOWLEDGMENTS

The authors express gratitude to Prof. S.I. Krasheninnikov (UCSD) for supervising the ongoing work on the research problem. A.A. Stepanenko would like to thank Prof. L.E. Zakharov (PPPL), the head of the laboratory on Plasma–Surface Interaction and Plasma Technologies of the National Research Nuclear University “MEPhI,” created under the megagrant no. 14.Y26.31.0008 by the Russian Ministry of Science and Higher Education, for providing access to the high-performance computing cluster.

Funding

A.A. Stepanenko thanks the Russian Science Foundation for the financial support under grant no. 18-12-00329 of the theoretical work carried out and presented in the study. H.Q. Wang acknowledges the financial support from the U.S. Department of Energy under award no. DE-FC02-04ER54698 for conducting experiments at DIII-D.

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Authors and Affiliations

  1. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409, Moscow, Russia

    A. A. Stepanenko

  2. Oak Ridge Association of Universities, Oak Ridge, USA

    H. Q. Wang

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  1. A. A. Stepanenko
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  2. H. Q. Wang
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Correspondence to A. A. Stepanenko or H. Q. Wang.

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Stepanenko, A.A., Wang, H.Q. Spatial–Temporal Properties of Current-Convective Turbulence in Divertor Plasma under DIII-D-Like Detached Conditions. Plasma Phys. Rep. 45, 627–636 (2019). https://doi.org/10.1134/S1063780X19070110

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  • DOI: https://doi.org/10.1134/S1063780X19070110

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