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Magnetic strike point: Difference between revisions
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[[File:Strike_points.png|350px|right|thumb|Cross section of a tokamak plasma (<math>R</math> increases to the right) with strike points and related features labeled.]] | [[File:Strike_points.png|350px|right|thumb|Cross section of a tokamak plasma (<math>R</math> increases to the right) with strike points and related features labeled.]] | ||
Magnetic strike points are where the separatrix of a diverted tokamak plasma intersects the wall. | Magnetic strike points are where the [[separatrix]] of a [[divertor|diverted]] [[tokamak]] plasma intersects the wall. | ||
Typically, the highest heat loads are deposited at the outer (large <math>R</math>) strike point of the primary separatrix. | Typically, the highest heat loads are deposited at the outer (large <math>R</math>) strike point of the primary separatrix. | ||
Whether or not the strike points of a secondary separatrix receive significant fluxes is sensitive to <math>dR_{sep}</math>, the separation distance between the separatrices at the outboard midplane. | Whether or not the strike points of a secondary separatrix receive significant fluxes is sensitive to <math>dR_{sep}</math>, the separation distance between the separatrices at the outboard midplane. | ||
As separation shrinks the secondary outer strike point will start to receive higher flux, and the primary inner strike point will receive less. | As separation shrinks, the secondary outer strike point will start to receive higher flux, and the primary inner strike point will receive less. | ||
In a double null configuration with very small separation between the primary and secondary separatrices, the strike point in the direction of the <math>\vec{B} \times \vec{\nabla} B</math> drift will tend to receive more heat flux, breaking the symmetry. | In a double null configuration with very small separation between the primary and secondary separatrices, the strike point in the direction of the [[:wiki:Guiding_center#Grad-B_drift|<math>\vec{B} \times \vec{\nabla} B</math> drift]] will tend to receive more heat flux, breaking the symmetry. | ||
The strike points are important references for profiles of various quantities along the surface of the divertor target plates. | The strike points are important references for profiles of various quantities along the surface of the divertor target plates. | ||
Many quantities, like heat flux, particle flux, and electron temperature tend to have peaks near the strike points. | Many quantities, like heat flux, particle flux, and electron temperature tend to have peaks near the strike points. | ||
It is often useful to cast plots vs. <math>x-x_{strike}</math> instead of just <math>x</math> (where ''x'' might be ''R'', ''Z'', or distance along the plate). | It is often useful to cast plots vs. <math>x-x_{strike}</math> instead of just <math>x</math> (where ''x'' might be ''R'', ''Z'', or distance along the plate). | ||