Abstract
A novel soft X-ray (SXR) data analysis technique has been recently developed and applied to the SXR data from the STOR-M tokamak to determine the radial locations of rotating magnetohydrodynamic (MHD) modes by examining the difference signals between two neighboring SXR channels [Rev. Sci. Instrum. 2011, 82, 053503]. In the simulations presented in this paper, the realistic SXR viewing angles and different SXR emissivity models are included. Comparison is made for two emissivity models: (a) a model with a constant SXR emissivity within the island and zero background equilibrium emissivity outside the island and (b) Gaussian emissivity perturbation inside the island with the parabolic background equilibrium emissivity distribution. Simulations with both emissivity profiles reveal the same criteria for determination of the radial position of the magnetic islands: (a) the phase reversal of the oscillations in the difference signals and (b) increase in the oscillation amplitude near the island. The results demonstrated the robustness of the techniques suitable for various kinds of emissivity perturbations due to rotating magnetic islands.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
