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19 April 2024 |
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Article overview
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Full particle orbit effects in regular and stochastic magnetic fields | | Shun Ogawa
; Benjamin Cambon
; Xavier Leoncini
; Michel Vittot
; Diego del Castillo-Negrete
; Guilhem Dif-Pradalier
; Xavier Garbet
; | | Date: |
18 Apr 2016 | | Abstract: | We study numerically the motion of a charged particle evolving in a periodic
cylindric static magnetic field, in order to investigate a magnetic model of
internal transport barrier (ITB). Starting from an initial ideal configuration
with a given q-profile, we perturb the magnetic structure by adding first only
one mode, and then two modes. In the first two considered cases magnetic field
lines are integrable, while they become chaotic when two modes are present.
Regarding the particle motion, while it is integrable in the ideal
configuration, we show that generic chaotic motion arises as soon as one of the
magnetic mode is present. Given the presence of two conserved quantities, the
existence of chaos in phase space implies that a conserved quantity related to
the magnetic moment cannot exist globally in phase space. Regarding the motion
when two modes are present and magnetic field lines are chaotic, the particles
trajectory analysis indicates that the regions where chaotic motion occurs
decreases as the energy of particle is increased. These results indicate that
except for particles with small velocities with small enough Larmor radii, the
transport barrier are still effectively present despite their apparent
destruction. Since it is expected that particles with very high energy will not
be confined in the cylinder, we conclude that the ITB model acts as a filter
and traps particles within a given energy range. | | Source: | arXiv, 1604.5112 | | Services: | Forum | Review | PDF | Favorites | |
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