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Study on creation and destruction of transport barriers via effective safety factors for energetic particles | | Shun Ogawa
; Xavier Leoncini
; Guilhem Dif-Pradalier
; Xavier Garbet
; | | Date: |
10 Oct 2016 | | Abstract: | Charged particles with low kinetic energy move along magnetic field lines,
but so do not energetic particles. We investigate the topological structure
changes in the phase space of energetic particles with respect to the magnetic
one. For this study cylindrical magnetic fields with non-monotonic safety
factors that induce the magnetic internal transport barrier are considered. We
show that the topological structure of the magnetic field line and of the
particle trajectories can be quite different. We explain this difference using
the concept of effective particle $q$-profile. Using this notion we can
investigate the location and existence of resonances for particle orbits that
are different from the magnetic ones. These are examined both numerically by
integrating an equation of motion and theoretically by use of Alfv’en’s
guiding center theory and by use of the effective reduced Hamiltonian for the
integrable unperturbed system. It is clarified that, for the energetic
particles, the grad $B$ drift effect shifts the resonances and the drift
induced by curvature of the magnetic field line leads to the vanishing of the
resonances. As a result, we give two different mechanisms that lead to the
creation of transport barriers for energetic particles in the region where the
magnetic field line is chaotic. | | Source: | arXiv, 1610.2867 | | Services: | Forum | Review | PDF | Favorites | |
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