The Singular Value Decomposition as a Tool of Investigating Central MHD Instabilities in the HL-1M Tokamak
| Autor: | Dong Yun-Bo, Fu Bingzhong, Pan Chuanhong, Liu Yi |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Surface (mathematics) Tokamak Perturbation (astronomy) Plasma Radius Condensed Matter Physics Computational physics law.invention Classical mechanics Physics::Plasma Physics law Temporal resolution Physics::Space Physics Singular value decomposition Astrophysics::Solar and Stellar Astrophysics Magnetohydrodynamics |
| Zdroj: | Plasma Science and Technology. 6:2307-2312 |
| ISSN: | 1009-0630 |
| DOI: | 10.1088/1009-0630/6/3/008 |
| Popis: | A variety of strong MHD instabilities are always resulted from MHD activity of Tokamak plasmas. Central MHD instabilities can be observed with pinhole cameras to record soft x-ray (SXR) emission from the plasma along many chords with a high temporal resolution. The investigation of MHD instabilities often necessitates an analysis on spatial-temporal signals. The method of Singular Value Decomposition (SVD) can split such signals into orthogonal spatial and temporal vectors. By this means, the repetition time and the characteristic radius of various MHD phenomena such as sawteeth and snake-like perturbation can be obtained. Moreover, the (1,1) MHD mode is analyzed in great detail by SVD and used to determine the radius of the q = 1 surface. |
| Databáze: | OpenAIRE |
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