title: x-ray irradiation analysis based on wavelet transform in tokamak plasma.
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.
authors.affiliation: Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
authors.forename: K
authors.initials: K
authors.lastname: Ghanbari
authors.affiliation: Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Ghoranneviss
authors.affiliation: Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
authors.forename: A Salar
authors.initials: AS
authors.lastname: Elahi
authors.affiliation: Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Saviz
mesh_terms: D004574:Electromagnetic Fields; D004583:Electrons; D008962:Models, Theoretical; D058626:Plasma Gases; D058067:Wavelet Analysis; D014965:X-Rays
chemical_list: D058626:Plasma Gases
keywords: MHD activity; Tokamak; Wavelet transform; runaway electrons; x-ray