Overdense plasma heating in Wendelstein 7-X(W7-X) stellarator

Adlparvar, S.; Miraboutalebi, S.; Kiai, S. M. Sadat; Rajaee, L.

doi:10.1016/j.rinp.2017.06.015

Cited by 2 publications

(1 citation statement)

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“…In OSXB double mode conversion, the incident electromagnetic (EM) wave is launched obliquely from the low magnetic field side to the confined plasma. Here, the mode conversion efficiency depends on many parameters including the density gradient L n , magnetic field source B 0 , optimum launching angle θ [6]. Moreover, the launching incident EM wave should be rescannable at high harmonics, i.e., at lower harmonics, the process of Landau damping or cold plasma dispersion will happen, but at medium and high harmonics the ECRH heating will occur [7].…”

Section: Introductionmentioning

confidence: 99%

Study Electron Cyclotron Double Mode Conversion in Overdense Plasma

et al. 2019

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Double mode conversion from ordinary mode O to extraordinary mode X is used to achieve electron Bernstein wave (EBWs) for the electron cyclotron resonance heating (ECRH). The efficiency of the mode conversion depends on many parameters including the density gradient L n , magnetic field source B 0 and optimum launching angle N z. An analytical formalism together with a numerical computation have been employed, considering W7X stellarator main parameters, such as 140 GH z , k 0 = 29 cm −1 , 2.5 T and 2.4 ×10 20 m −3 , in order to investigate the efficiency of the mode conversion. The values of the density gradient Ln, obtained by numerical simulation, are from 1 to 10 cm. These values of L n correspond to the power transmission window T OSX from 88 to 29%. Moreover, the dispersion relation of the EBW mode propagation up to 10 harmonics, ω = 10ω ce , has been plotted to help a better visualization of the EBW mode heating. Finally, the power deposition profiles around the resonance layers were calculated and presented.

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Section: Introductionmentioning

confidence: 99%