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Fast-Scale Perturbations of Electromagnetic Fields upon Development of Arc Discharges at an Early Stage of Disruption in the T-10 Tokamak Plasma

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Abstract

The conditions leading to the development of fast-scale (  f ~ 0.2–1.5 MHz) electromagnetic oscillations in the periphery regions of plasma at an early stage of disruption in the T-10 tokamak are analyzed. Spatial and temporal characteristics of fast-scale oscillations are investigated by moving magnetic and electric probes mounted inside the tokamak vacuum chamber. Analysis reveals that initiation of the fast-scale oscillations can be related to the development of arc discharges in plasma near the T-10 tokamak limiters. The transition to a major disruption and collapse of the plasma current is accompanied by a sharp increase in the amplitude of the fast-scale electromagnetic oscillations. Monitoring the fast-scale electromagnetic oscillations at the plasma periphery can be an important trigger for systems to safely quench the discharge in a to-kamak.

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ACKNOWLEDGMENTS

The authors thank A.M. Kakurin, D.V. Sarychev, D.S. Sergeev, R.Yu. Solomatin, and A.V. Sushkov for providing some of the diagnostics data; and they thank G.E. Notkin, S.G. Maltsev, Yu.D. Pavlov, D.V. Ryzhakov, V.P. Budaev, L.N. Khimchenko, and S.A. Grashin for supporting this research.

Funding

The measurements described in Section 2 were carried out with the support of Rosatom State Atomic Energy Corporation (contract 2019). The analysis presented in Section 5 was supported by the Kurchatov Institute National Research Center, order no. 1111 dated June 1, 2019.

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  1. National Research Center Kurchatov Institute, 123098, Moscow, Russia

    P. V. Savrukhin, E. A. Shestakov & A. V. Khramenkov

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  1. P. V. Savrukhin
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Correspondence to P. V. Savrukhin, E. A. Shestakov or A. V. Khramenkov.

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Translated by I. Shumai

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Savrukhin, P.V., Shestakov, E.A. & Khramenkov, A.V. Fast-Scale Perturbations of Electromagnetic Fields upon Development of Arc Discharges at an Early Stage of Disruption in the T-10 Tokamak Plasma. Plasma Phys. Rep. 46, 349–362 (2020). https://doi.org/10.1134/S1063780X2004011X

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