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Changes in Statistical Characteristics of Turbulent Plasma Density Fluctuations During a Transport Transition in the L-2M Stellarator

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Abstract

At the specific power of electron cyclotron resonance (ECR) heating of 3.2 MW m–3 (plasma density of 2 × 1019 m–3, electron temperature of 0.6 keV), an increase in the plasma energy lifetime by not less than 30% is accompanied by a two-time-decrease in the level of short-wave turbulent density fluctuations. In such a shot, before the beginning of the quasi-stationary confinement stage, the turbulent state of density fluctuations is characterized by the stronger deviation from zero of the coefficient of excess of fluctuation increments than it is in shots without transport transitions. This indicates the stronger deviation of the probability distribution function of density fluctuation increments from the normal law in shots with transport transitions. Based on the analysis of increments of short-wave fluctuations using the special method for separating the continuous components in stochastic processes, a qualitative difference was established between the behaviors of the structural components forming the plasma turbulence in shots with and without transport transitions. In addition, for shots with transport transitions, a change in the shape of the approximating finite mixture of normal distributions and parameters of its component densities is demonstrated.

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ACKNOWLEDGMENTS

Statistical analysis of ensembles of experimental data was performed by A.K. Gorshenin using the infrastructure of the Shared Research Facilities “High Performance Computing and Big Data” (CKP “Informatics”) of the Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences (Moscow). The authors express their gratitude to the sc-ientific team of the L-2M stellarator represented by I.Yu. Vafin, A.I. Meshcheryakov, I.A. Grishina, D.G. Vasilkov, S.E. Grebenshchikov, and Yu.V. Kholnov for providing measurement data on the mean plasma density, electron temperature, plasma energy content, and limiter voltage.

Funding

The article was prepared with partial financial support from the Ministry of Education and Science of the Russian Federation as part of the implementation of the program of the Moscow Center for Fundamental and Applied Mathematics (agreement no. 075-15-2022-284).

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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, K. A. Sarksyan, V. D. Stepakhin & N. K. Kharchev

  2. Peoples’ Friendship University of Russia, 117198, Moscow, Russia

    V. D. Borzosekov

  3. Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences, 119333, Moscow, Russia

    A. K. Gorshenin

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  1. G. M. Batanov
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  2. V. D. Borzosekov
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Translated by I. Grishina

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Batanov, G.M., Borzosekov, V.D., Gorshenin, A.K. et al. Changes in Statistical Characteristics of Turbulent Plasma Density Fluctuations During a Transport Transition in the L-2M Stellarator. Plasma Phys. Rep. 48, 740–753 (2022). https://doi.org/10.1134/S1063780X2270026X

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