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Investigation of Tokamak Plasma MHD Activity Using FFT Analysis of Mirnov Coils Oscillations

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Abstract

A tokamak plasma mode was analyzed using the Fast Fourier Transform (FFT). Fourier analysis is reliable technique for mode detection in tokamaks. For this purpose, we used a poloidal array of Mirnov coils. After Fourier analysis on Mirnov coils data, Power Spectral Density (PSD) diagram was plotted. PSD describes how the power of a signal is distributed with frequency. In this contribution we also determined edge safety factor and safety factor from Fourier based derived mode numbers q = m/n. We obtained the maximum MHD activity using power spectrum in the frequency of 33 kHz. Also the edge safety factor determined small than 3, and the values of obtained safety factor from the mode numbers are between 2 ≤ q ≤ 5.

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Acknowledgments

The authors thank from the discussion with Dr. Khorshid and IR-T1 technical team Mr. Mohammadi, Arvin and Nick- Mohammadi.

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Authors and Affiliations

  1. Department of Physics, Science and Research Branch, Islamic Azad University, Fars, Iran

    Z. Goodarzi

  2. Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran

    M. Ghoranneviss & A. Salar Elahi

Authors
  1. Z. Goodarzi
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  2. M. Ghoranneviss
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  3. A. Salar Elahi
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Correspondence to A. Salar Elahi.

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Goodarzi, Z., Ghoranneviss, M. & Salar Elahi, A. Investigation of Tokamak Plasma MHD Activity Using FFT Analysis of Mirnov Coils Oscillations. J Fusion Energ 32, 103–106 (2013). https://doi.org/10.1007/s10894-012-9526-4

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  • DOI: https://doi.org/10.1007/s10894-012-9526-4

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