Magnetic Fields and Magnetic Diagnostics for Tokamak Plasmas

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Magnetic fields and tokamak plasmas Alan Wootton Figure 18.7. The internal electric field prior to a disruption (from Hutchinson) Figure 18.7 shows some spatial profiles of E φ from this analysis just before and at a disruption. Although the edge electric field goes negative (the negative voltage spike) the internal electric field strongly positive. In principle, having measured j and E we could derive the local conductivity. Mirnov Oscillations The same probes used to measure the internal equilibrium properties can be used to look at the Mirnov fluctuations (as long as the coils have a sufficiently high frequency response). Data from such experiments has isolated the radial dependence of the fluctuating b r , b θ fields, as shown in Figure 18.8. It agrees with our discussion in section 17, namely b ∝ (r mn /r) m+1 for r > rmn without a vacuum vessel. In the presence of a conducting vessel at r = r w we must account for the image currents which flow, so for example we would expect 138
Magnetic fields and tokamak plasmas Alan Wootton Figure 18.8. The measured radial dependence of the fluctuating poloidal fields (Mirnov oscilations) from and m = 2 tearing mode (measurements in TOSCA). 139
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Magnetic Fields and Magnetic Diagnostics for Tokamak Plasmas

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