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The effect of biased limiter on the magnetic island width in tokamak plasma

Published online by Cambridge University Press:  13 December 2013

M. Ghasemloo ,
M. Ghoranneviss  and
M. K. Salem
M. Ghasemloo*
Affiliation:
Department of Physics, Shahr-e-Ray Branch, Islamic Azad University, Tehran, Iran
M. Ghoranneviss
Affiliation:
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, P.O.Box 14665-678, Tehran, Iran
M. K. Salem
Affiliation:
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, P.O.Box 14665-678, Tehran, Iran
*
†Email address for correspondence: ghasemloomaryam@gmail.com
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Abstract

In this work the effects of Cold Biased Limiter (CBL) and Emissive Biased Limiter (EBL) have been individually investigated, in both positive and negative polarities, on the width and frequency of magnetic islands. The effects were examined using singular value decomposition and wavelet techniques on mirnov coil signals. The results show that the application of EBL with both positive and negative polarities has been more effective on plasma stability compared with CBL. Comparing different polarities of CBL and EBL revealed that the positive polarity was more effective on the width of magnetic islands than negative polarity. The greatest impact occurs during EBL with positive polarity, in which reduction is observed in both width of magnetic islands and emission of Hα radiation. Besides, intensity and frequency of magnetic islands are reduced from 50 to 25 kHz in around 1 ms after bias application. Meanwhile, the minimal effect on width and frequency of magnetic field occurs in CBL with negative polarity.

Type
Papers
Information
Journal of Plasma Physics , Volume 80 , Issue 1 , February 2014 , pp. 113 - 130
Copyright
Copyright © Cambridge University Press 2013 

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