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Control of the Plasma Characteristics by Hot Limiter Biasing in the IR-T1 Tokamak

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3 Author(s)
Agah, K.M. ; Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran ; Elahi, A.S. ; Ghoranneviss, M.

A tokamak's plasma characteristics as well as plasma modes are analyzed in the presence of hot limiter biasing regime in the IR-T1 Tokamak. Fast Fourier transform analysis is a reliable technique for mode detection in tokamaks. For this purpose, we use a poloidal array of Mirnov coils and hot limiter biasing system. After Fourier analysis on Mirnov coils data in the presence of hot biased limiter, power spectral density (PSD) diagram is plotted. PSD describes how the power of a signal is distributed with frequency. We obtain the maximum MHD activity using power spectrum in the frequency of 33 kHz. In this contribution, we also determine edge safety factor and safety factor from Fourier-based derived mode numbers $q=m/n$. The edge safety factor was determined to be smaller than 3, and the values of obtained safety factor from the mode numbers are between $2leq qleq 5$. Results show that hot limiter biasing with appropriate conditions can be used for control of the plasma safety factor and other plasma characteristics.

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Plasma Science, IEEE Transactions on  (Volume:41 ,  Issue: 8 )