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Time–Space Evolution of the Parameters of Turbulent Density Fluctuations During Pulsed EC Heating of the Plasma at the L-2M Stellarator

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Abstract

The study is continued of the temporal changes of the parameters of turbulent plasma density fluctuations during multi-pulse electron cyclotron (EC) heating of the plasma on the L-2M stellarator. The plasma density fluctuations with different wave vectors (k = 30, 20, 2, and 1 cm –1) in different spatial regions of the plasma column were recorded by the method of collective scattering of microwave radiation. The time dependence of plasma density fluctuations, which has a bursty shape, was analyzed, including the discharges in which the gyroresonance region was shifted by 3–4 cm from the center of the plasma column toward the inside of the torus. A comparison was made between the specificities of the evolution of plasma density fluctuations and the evolution of their statistical characteristics. It was found that the kurtosis (M4) of the scattering signals deviates from the value 3, which also occurs in bursts. During a EC heating pulse, three groups of different bursts (of signal intensity, its kurtosis and their increments) were observed. Autocorrelation analysis of density fluctuations and their increment was carried out and it showed that the half-width of the autocorrelation functions changes during multi-pulse EC heating. The probability of the initiation of bursty processes by perturbations in the near-wall plasma region is discussed.

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ACKNOWLEDGMENTS

We are grateful to the scientific team of the L-2M stellarator (and personally, to D.G. Vasil’kov, I.U. Vafin, E.V. Voronova, S.E. Grebenshchikov, I.A. Grishina, A.A. Letunov, V.P. Logvinenko, A.I. Meshcheryakov, and Yu.V. Khol’nov) for the results of the measurements of main plasma macroparameters and informative discussions of the specific features of the multi-pulse EC heating.

Funding

This work was supported by the Russian Foundation for Basic Research, project no. 18-02-00621.

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Authors and Affiliations

  1. Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia

    G. M. Batanov, V. D. Borzosekov, L. V. Kolik, E. M. Konchekov, D. V. Malakhov, A. E. Petrov, K. A. Sarksyan, N. N. Skvortsova, V. D. Stepakhin, N. K. Kharchev & A. A. Kharchevsky

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  1. G. M. Batanov
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Correspondence to V. D. Borzosekov.

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Translated by E. Voronova

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Batanov, G.M., Borzosekov, V.D., Kolik, L.V. et al. Time–Space Evolution of the Parameters of Turbulent Density Fluctuations During Pulsed EC Heating of the Plasma at the L-2M Stellarator. Plasma Phys. Rep. 46, 955–966 (2020). https://doi.org/10.1134/S1063780X20100025

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