Magnetic Fields and Magnetic Diagnostics for Tokamak Plasmas
Magnetic Fields and Magnetic Diagnostics for Tokamak Plasmas
Magnetic Fields and Magnetic Diagnostics for Tokamak Plasmas
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<strong>Magnetic</strong> fields <strong>and</strong> tokamak plasmas<br />
Alan Wootton<br />
B r (T)<br />
bottom<br />
outside<br />
inside<br />
θ (rad)<br />
top<br />
B (T)<br />
θ<br />
inside<br />
top<br />
θ (rad)<br />
outside<br />
Figure 6.14. The field components B r <strong>and</strong> B θ on a contour with minor radius 0.3m<br />
placed outside <strong>and</strong> concentric with the plasma described in Figure 6.13.<br />
More complicated configurations.<br />
It is easy to make non circular cross sectioned plasmas. Adding a quadrupole field produces an<br />
elliptic de<strong>for</strong>mation. Adding a hexapole field produces a triangular de<strong>for</strong>mation. There are some<br />
analytic expressions available <strong>for</strong> non circular cross sections, but in general numerical solutions<br />
to the basic Grad Shafranov equation must be used.<br />
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