Investigation of 3D tungsten distributions in (1, 1) kink modes induced by toroidal plasma rotation. (2nd July 2015)

• Record Type: Journal Article
• Authors: Weiland, M; Gude, A; Igochine, V; Maraschek, M; Zohm, H; Bohle, R; Dux, R; Lackner, K; Odstrčil, T; Pütterich, T
• Other Names: other.
• Is Part Of: Plasma physics and controlled fusion. Volume 57:Number 8(2015:Aug.)
• Publication Date: 2015-07-02
• Subjects: soft x-ray -- synthetic diagnostic -- volume of sight -- high-Z impurities -- centrifugal effect -- toroidal asymmetries -- phase profile; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/0741-3335/57/8/085002
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: The presence of high- Z impurities, such as tungsten (W), can lead to non-uniform SXR radiation on flux surfaces due to the centrifugal forces in rotating plasmas. The goal of this work is to characterize the effects of such rotation-induced radiation asymmetries on FFT-based SXR mode analysis. Therefore, a synthetic SXR diagnostic has been implemented, which takes into account the full 3D geometry of the detectors, resulting in a volume integration rather than the more simplifying line integration. We have focused on resistive kink modes, where we have implemented a model for the flux surfaces perturbed by the mode and the W distribution within. In a rotation scan, which leads to a variation of the asymmetry, a strong dependence of the FFT phase profile on the asymmetry strength is found. A comparison with experimental data shows good agreement, which verifies the used models.