TJ-II:Magnetic field: Difference between revisions

TJ-II:Magnetic field (view source)

72 bytes added , 12 October 2009

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 [[File:TJ-II Curvature.jpg|800px|thumb|center|TJ-II: Curvature &kappa;<sub>N</sub>]]
-Normal [[Magnetic curvature|magnetic curvature]] of the magnetic field, &kappa;<sub>N</sub>. Definition:
+Normal [[Magnetic curvature|magnetic curvature]] of the magnetic field, &kappa;<sub>N</sub>.
-:<math>\kappa_N = \kappa \cdot \frac{\nabla \psi}{|\nabla \psi|}</math>
+Positive values of &kappa;<sub>N</sub> are regions where curvature-driven modes are expected to be stable (note that this figure corresponds to the ''vacuum'' magnetic field -without plasma- so that strictly speaking it is not correct to speak about plasma stability).
-With this definition, positive values of &kappa;<sub>N</sub> are regions where curvature-driven modes are stable.
 [[File:TJ-II Local shear.jpg|800px|thumb|center|TJ-II: Local shear, ''s''<sub>local</sub>]]