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Determination of the resonant harmonics of the error field from dynamic magnetic measurements in a tokamak

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Abstract

The possibility is discussed of determining the amplitude and phase of a static resonant error field in a tokamak by means of dynamic magnetic measurements. The method proposed assumes measuring the plasma response to a varying external helical magnetic field with a small (a few gauss) amplitude. The case is considered in which the plasma is probed by square pulses with a duration much longer than the time of the transition process. The plasma response is assumed to be linear, with a proportionality coefficient being dependent on the plasma state. The analysis is carried out in a standard cylindrical approximation. The model is based on Maxwell’s equations and Ohm’s law and is thus capable of accounting for the interaction of large-scale modes with the conducting wall of the vacuum chamber. The method can be applied to existing tokamaks.

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Authors and Affiliations

  1. Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia

    V. D. Pustovitov

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  1. V. D. Pustovitov
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Original Russian Text © V.D. Pustovitov, 2008, published in Fizika Plazmy, 2008, Vol. 34, No. 1, pp. 20–26.

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Pustovitov, V.D. Determination of the resonant harmonics of the error field from dynamic magnetic measurements in a tokamak. Plasma Phys. Rep. 34, 18–23 (2008). https://doi.org/10.1134/S1063780X08010029

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  • DOI: https://doi.org/10.1134/S1063780X08010029

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