x-ray irradiation analysis based on wavelet transform in tokamak plasma

Article type: Research Article

Authors: Ghanbari, K. | Ghoranneviss, M. | Elahi, A. Salar | Saviz, S.

Affiliations: Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran

Note: [] Corresponding author: A. Salar Elahi, Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran. E-mail: [email protected]

Abstract: Hard x-ray emission from the Runaway electrons is an important issue in tokamaks. Suggesting methods to reduce the Runaway electrons and therefore the emitted hard x-ray is important for tokamak plasma operation. In this manuscript, we have investigated the effects of external fields on hard x-ray intensity and Magneto-Hydro-Dynamic (MHD) activity. In other words, we have presented the effects of positive biased limiter and Resonant Helical Field (RHF) on the MHD fluctuations and hard x-ray emission from the Runaway electrons. MHD activity and hard x-ray intensity were analyzed using Wavelet transform in the presence of external fields and without them. The results show that the MHD activity and therefore the hard x-ray intensity can be controlled by the external electric and magnetic fields.

Keywords: Tokamak, runaway electrons, x-ray, MHD activity, Wavelet transform

DOI: 10.3233/XST-140462

Journal: Journal of X-Ray Science and Technology, vol. 22, no. 6, pp. 777-783, 2014