Recent Experiments on the STOR-M Tokamak
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1 Recent Experiments on the STOR-M Tokamak Chijin Xiao and STOR-M Team Plasma Laboratory University of Saskatchewan 33 rd Annual Conference of CNS Saskatoon, June 10-13,
2 Acknowledgements Dr. T. Onchi Y. Liu, S. Elgriw, D. McColl Dr. M. Dreval (Institute of Plasma Physics NSC KIPT, Kharkov, Ukraine) Dr. T. Asai (Department of Physics, Nihon University, Tokyo, Japan) Prof. A. Hirose Supported by CRC and NSERC 2
3 Outline STOR-M Tokamak Program Motivation for Resonant Magnetic Perturbation (RMP) Experiments Experimental Setup Model Predictions Experimental Results Conclusions 3
4 STOR-M Tokamak Construction started 1984 Operation since 1987 Still active as the only tokamak in Canada PPL, Univ. of Sask.
5
6
7 STOR-M Programs 7 Transport studies Ohmic H-modes induced by CT injection, plasma biasing, edge heating Compact torus (CT) injection fuelling, pressure profile (bootstrap current) control in burning plasmas AC (alternating current) operation quasi-steady state tokamak operation most efficient ohmic heating method Diagnostics development Plasma flow velocity measurements Ion temperature measurement Microwave scattering, reflectometry PPL, Univ. of Sask.
8 STOR-M Programs (cont.) Magnetohydrodynamic (MHD) studies by resonant magnetic perturbations (RMPs) Suppression of m=2 MHD fluctuations Modification of plasma flow PPL is a member of IAEA CRP using small fusion devices 8 PPL, Univ. of Sask.
9 Motivations Magnetohydrodynamic (MHD) instabilities in tokamak have adverse/dangerous effects Degrade confinement Cause major disruptions heat load, structural damages Benefits of resonant magnetic perturbations (RMP) Reduce magnetic perturbations Modify plasma flow velocities which may lead to H-mode triggering Shielding of error field Prevent disruptions 9
10 Experimental Setup m/n=2/1 helical coils to suppress the dominant mode B B exp i m n t 0 10
11 Mirnov coils Mirnov coil arrays used to detect the mode structure and frequencies. SVD algorithm is used to analyze the MHD modes 11
12 Ion Doppler Spectroscopy Normal view: Wavelength calibration PMT array: Time resolved flow measurement 12 Tangential view: Doppler shift Choice of impurities spatial resolution: CIII: r=7cm OV: r= 4cm CVI: r=0cm
13 13 Model Predictions
14 14 Results -Suppression
15 Expanded traces RMP 15
16 Mirnov and SXR signal amplitudes and their wavelet spectra 16
17 Spatial structure of modes Before RMP (m=2) During RMP (m=3) After RMP (m=2) 17
18 Spatitial Fourier analysis and the rms amplitudes of m=1 to m=4 18
19 Flow velocity measurements r~4 cm r~0 cm RMP O V and C VI flow measurements at different RMP current. RMP was fired at 20ms for 8ms 19
20 (Top left) MHD and O V velocities vs IRMP (Top right) RMS of MHD fluctuations and O V flow vs IRMP (Bottom left) MHD velocity and RMS vs IRMP (Botton right) MHD and O V velocities vs IRMP
21 O V and C VI flow measurements at different double RMP pulses and I p. The first RMP was fired at 15ms for 3ms and the second was fired at 20ms for 3ms.
22 O V and C VI flow measurements at different non resonant magnetic perturbations (NRMP). NRMP was fired at 20ms for 8ms
23 Conclusions RMP significantly suppresses the m=2/n=1 magnetic fluctuations Plasma flow in the counter-current direction slows down (even reverses direction) during RMP Flow velocity is approximately proportional to the magnetic fluctuation amplitude. Effects of RMP on magnetic island becomes more significant with increasing current through the RMP coils. 23
24 24 Thanks you!
25 Research in Plasma Physics Laboratory Fusion plasma theory (A. Hirose, A. Smolyakov) Partially ionized plasma theory (A. Smolyakov) Tokamak experiments (A. Hirose, C. Xiao) CT injection (C. Xiao, A. Hirose) Plasma Processing (A. Hirose, Q.Q. Yang, C. Xiao) Ion implantation, photonics (M. Bradley) Page 25 SWIP, Chengdu 2013 年 8 月 5 日 4 时 10 分
26 Relative mode amplitudes Before Suppression During suppression After suppression 26
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