Fluctuation Studies in the Edge Plasma of the CT-6B Tokamak


P. Khorshid1,3), L. Wang2), M. Ghorannevis3), X.Z. Yang2), C.H. Feng2)

1)Physics Dept., Islamic Azad University, Mashhad 91865-164, Iran
2)Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
3)Plasma Physics Research Centre, Islamic Azad University, Tehran, Iran


In thermonuclear fusion plasmas, transport losses are usually believed to be caused by turbulent fluctuations. Particularly in the outer region of tokamaks, electrostatic fluctuations can be responsible for the radial energy flux and particle transport in the scrape-off layer (SOL). In the edge plasma of the CT-6B tokamak, the magnetic and electrostatic fluctuations were investigated using Mirnov coils, a moveable limiter and Hα light emission in the normal and limiter biased discharges. We found that the plasma potential fluctuations in the edge of plasma are nearly dependent on the magnetic fluctuations. The results shown that there is a close correlation in the fluctuation level and suppression of Hα emission and magnetic field at the core and edge of plasma.

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