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タイトル: | Highly time-resolved evaluation technique of instantaneous amplitude and phase difference using analytic signals for multi-channel diagnosticsa) |
著者: | Ohshima, S. Kobayashi, S. Yamamoto, S. Nagasaki, K. Mizuuchi, T. Kado, S. Okada, H. Minami, T. Lee, H. Y. Zang, L. Kenmochi, N. Kasajima, K. Ohtani, Y. Shi, N. Nagae, Y. Konoshima, S. Sano, F. |
著者名の別形: | 大島, 慎介 |
発行日: | Nov-2014 |
出版者: | AIP Publishing |
誌名: | Review of Scientific Instruments |
巻: | 85 |
号: | 11 |
論文番号: | 11E814 |
抄録: | A fluctuation analysis technique using analytic signals is proposed. Analytic signals are suitable to characterize a single mode with time-dependent amplitude and frequency, such as an MHD mode observed in fusion plasmas since the technique can evaluate amplitude and frequency at a specific moment without limitations of temporal and frequency resolutions, which is problematic in Fourier-based analyses. Moreover, a concept of instantaneous phase difference is newly introduced, and error of the evaluated phase difference and its error reduction techniques using conditional/ensemble averaging are discussed. These techniques are applied to experimental data of the beam emission spectroscopic measurement in the Heliotron J device, which demonstrates that the technique can describe nonlinear evolution of MHD instabilities. This technique is widely applicable to other diagnostics having necessity to evaluate phase difference. |
著作権等: | © 2014 AIP Publishing LLC |
URI: | http://hdl.handle.net/2433/189550 |
DOI(出版社版): | 10.1063/1.4891102 |
PubMed ID: | 25430379 |
出現コレクション: | 学術雑誌掲載論文等 |
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