Detection of slowly rotating n = 1 mode with signal compensation for an externally perturbed field in the KSTAR tokamak
| Autor: | Juram Kim, J.G. Bak, Y. In, Hyunsun Han, Ju-Yeob Lee, S.W. Yoon, Sang-hee Hahn, Young-Mu Jeon |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Tokamak Toroid Field (physics) Mechanical Engineering Plasma 01 natural sciences Signal 010305 fluids & plasmas Computational physics law.invention Magnetic field Nuclear Energy and Engineering law KSTAR 0103 physical sciences Eddy current General Materials Science 010306 general physics Civil and Structural Engineering |
| Zdroj: | Fusion Engineering and Design. 145:33-39 |
| ISSN: | 0920-3796 |
| DOI: | 10.1016/j.fusengdes.2019.05.022 |
| Popis: | A mode identification method for slowly rotating (or non-rotating) n (toroidal mode number) = 1 plasma instabilities has been newly established with the signal compensation method used for an external time-varying magnetic field. The mode identification method is based on the Fourier decomposition scheme and processes the signal of the magnetic probes (MPs) on the passive stabilizer in the Korea Superconducting Tokamak Advanced Research (KSTAR) tokamak. To exclude the non-plasma magnetic perturbation by the external current coils and their secondary eddy currents on the passive stabilizer that may not be easily characterized, the ARX-SISO (autoregressive with exogenous terms-single input single output) method has been introduced in the signal compensation process. Preliminary off-line analysis presented herein confirms that this method can adequately detect the time evolution of the mode-locking, along with a slowly rotating state, even in the presence of external magnetic perturbations. |
| Databáze: | OpenAIRE |
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