A quasi-optical beam-tracing code for electron cyclotron waves absorption and current drive in tokamaks
26976a31dd
This change limits the evaluation of the poloidal flux spline ψ(R,z) to a particular domain where ψ(R,z) is strictly monotonic. This choice ensures that ψ_n < 1 only inside the plasma boundary; so plasma parameters like q(ψ), Te(ψ), etc. can be mapped to the physical space without ambiguities. Before this change, anywhere ψ_n happened to decrease below 1 (either as a result of a physical current or simply from the spline extrapolation), Gray would effectively create a spurious plasma region. This behavior is seriously problematic because it completely invalidates the simulation: it can alter the ray directions, the power disribution and total power if the beam enters one such region. The domain is computed by applying a transformation to the contour of the plasma boundary: for each contour point we cast a ray from the magnetic axis to that point and extend the ray until the restriction of ψ(R,z) on the ray starts decreasing or reach a maximum scaling factor. The endpoint of the ray is then taken as the new point. If ψ(R,z) is globally monotonic, the transformation is a homotety wrt the magnetic axis, so the domain will be an enlarged boundary; otherwise the shape will be more irregular (an intersection of the enlarged boundary and several level curves of ψ). Finally, each `pol_flux(r, z)` call is now guarded behind a check `inside(psi_domain, r, z)`. For points outside the domain the subroutine returns, as usual, -1 for ψ and 0 for derivatives. |
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| input | ||
| scripts | ||
| src | ||
| srcjetto | ||
| tests | ||
| .gitignore | ||
| configure | ||
| default.nix | ||
| depend | ||
| LICENSE.md | ||
| Makefile | ||
| minpack-LICENSE.txt | ||