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Influences of multiple low- modes on resistive wall mode identification and feedback control
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View: Figures


Image of FIG. 1.
FIG. 1.

Time evolution of the modes responsible for the plasma rotation drop and collapse. Shown are the time traces of (a) , and (the estimated no-wall ); (b) upper plane view photodiode; (c) plasma rotation at , where is the normalized radius; (d) matched-filtered mode amplitudes with and without the basis vectors; (e) and mode amplitudes based on the expanded matched filter; (f) carbon plasma rotation at , 0.7 and 0.9; (g) expanded view of the and mode amplitudes with the numerically extracted mode amplitude from Mirnov probes. The time frames in (f) and (g) are denoted in (c) and (e), respectively.

Image of FIG. 2.
FIG. 2.

Profiles of pressure, safety factor, and plasma rotation. Shown are the profiles of (a) pressure and safety factor at , (b) plasma rotation, and (c) detailed edge pressures from the region denoted in (a). In (a), the pressure profile (solid curve) is based on the kinetic EFIT using the experimental measurements, whereas the other neighboring profiles (either dashed or dash-dot curve) are a part of the scaled pressure profiles adopted for stability study. In (b) and (c), the dashed curves are the profiles at in the pre-ELM phase, while the solid curves are at in the post-ELM phase. The rotation measurement error bars are within , which are not distinguishable on this figure, if plotted.

Image of FIG. 3.
FIG. 3.

Ideal MHD no-wall and ideal-wall -limits based on DCON. Based on a kinetic equilibrium reconstruction at of the DIII-D discharge 122929, the ideal MHD no-wall (▲) and ideal-wall limits (●) were calculated for , 2, and 3 modes using the DCON stability code. The experimental value is also shown for comparison.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influences of multiple low-n modes on n=1 resistive wall mode identification and feedback control