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Gaussian complex wavelet transform was used in the dynamic frequency spectrum analysis of HT-7 MHD (magneto-hydrodynamic) oscillations. It is shown that this method can provide good temporal resolution and spatial resolution, which is suitable to analyze the dynamic frequency spectrum of MHD oscillations. Typical discharges with sawtooth and MHD instabilities are analyzed with this method. The results show that the oscillation frequency is associated with the plasma pressure gradient.
[1] Deng Y Q, Xing Q R, Lang L Y, Chai L, Wang Q Y, Zhang Z G 2005 Acta Phys. Sin. 54 5224 (in Chinese)[邓玉强、邢岐荣、郎利影、柴 路、王清月、张志刚2005 54 5224]
[2] ZhangMJ, HeSP, TanH, XuWM 2000J. Vib. Meas. Diag. 20211(in Chinese)[张梅军、何世平、谭 华、徐文明 2000 振动、测试与诊断 20 211]
[3] Nagayama Y, Yamada M, Park W, Fredrickson E D, Janos A C, McGuire K M, Taylor G 1996 Phys. Plasmas 5 1647
[4] Von Goeler S, Stodiek W, Sauthoff N 1974 Phys. Rev. Lett. 33 1201
[5] Porcelli F, Boucher D, Rosenbluth M N 1996 Plasma Phys. Contr. Fusion 38 2163
[6] Zhong F C, Xie J K, Xu Z Z 1998 Nucl. Fusion Plasma Phys. 18 37 (in Chinese)[钟方川、谢纪康、徐至展1998 核聚变与等离子体物理 1837]
[7] ZhouW 2006 Advanced Technique of MATLAB Wavelet Analysis (Xian: Xidian University Press) p5 [周 伟2006 MATLAB小波分析高级技术(西安:西安电子科技大学出版社)第5页]
[8] Yamaguchi S, Igami H, Tanaka H, Maekawa T 2004Plasma Phys. Contr. Fusion 46 1163
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[1] Deng Y Q, Xing Q R, Lang L Y, Chai L, Wang Q Y, Zhang Z G 2005 Acta Phys. Sin. 54 5224 (in Chinese)[邓玉强、邢岐荣、郎利影、柴 路、王清月、张志刚2005 54 5224]
[2] ZhangMJ, HeSP, TanH, XuWM 2000J. Vib. Meas. Diag. 20211(in Chinese)[张梅军、何世平、谭 华、徐文明 2000 振动、测试与诊断 20 211]
[3] Nagayama Y, Yamada M, Park W, Fredrickson E D, Janos A C, McGuire K M, Taylor G 1996 Phys. Plasmas 5 1647
[4] Von Goeler S, Stodiek W, Sauthoff N 1974 Phys. Rev. Lett. 33 1201
[5] Porcelli F, Boucher D, Rosenbluth M N 1996 Plasma Phys. Contr. Fusion 38 2163
[6] Zhong F C, Xie J K, Xu Z Z 1998 Nucl. Fusion Plasma Phys. 18 37 (in Chinese)[钟方川、谢纪康、徐至展1998 核聚变与等离子体物理 1837]
[7] ZhouW 2006 Advanced Technique of MATLAB Wavelet Analysis (Xian: Xidian University Press) p5 [周 伟2006 MATLAB小波分析高级技术(西安:西安电子科技大学出版社)第5页]
[8] Yamaguchi S, Igami H, Tanaka H, Maekawa T 2004Plasma Phys. Contr. Fusion 46 1163
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