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Effect of external resonant fields and limiter biasing on hard X-ray intensity and mirnov oscillations in IR-T1 Tokamak

Published online by Cambridge University Press:  25 June 2014

K. Ghanbari ,
M. Ghoranneviss  and
A. Salar Elahi
K. Ghanbari
Affiliation:
Plasma Physics Research Center, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
M. Ghoranneviss
Affiliation:
Plasma Physics Research Center, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
A. Salar Elahi*
Affiliation:
Plasma Physics Research Center, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
*
†Email address for correspondence: Salari_phy@yahoo.com
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Abstract

Runaway electrons in tokamaks can cause serious damage to the first wall of the reactor and decrease its life time. Also, hard x-ray emission generated from high energy runaway electrons lead to the plasma energy loss. Therefore, suggesting methods to minimize runaway electron in tokamaks are very important. Applying external resonant field is one of the methods for controlling the Magneto Hydrodynamic (MHD) activity. Relation between the MHD activity and runaway electrons has already been studied (Jaspers et al. 1994; Ghanbari et al. 2012) Jaspers, R., et al. 1994 Phys. Rev. Lett.72, 4093; Ghanbari, M. R., et al. 2012a Phys. Scr.83, 055501. Present study attempts to investigate the effects of limiter biasing and Resonant Helical magnetic Field (RHF) on the generation of runaway electrons. For this purpose, plasma parameters such as plasma current, MHD oscillation, loop voltage, emitted hard x-ray intensity, Halpha impurity, safety factor in the presence and absence of external fields, were measured. Frequency activity was investigated with FFT analysis. The results show that applying resonant fields can control the MHD activity, and then hard x-ray emitted from the runaway electrons.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 1 , January 2015 , 905810103
Copyright
Copyright © Cambridge University Press 2014 

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References

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