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Particle deconfinement in a bent magnetic mirror
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10.1063/1.4765692
/content/aip/journal/pop/19/11/10.1063/1.4765692
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/11/10.1063/1.4765692
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Cut-view of the bent magnetic mirror configuration considered. Each coil is tilted by an angle with respect to the longitudinal mid-plane. Coils are distant by 2 L = 1 m and are 15 cm in radius.

Image of FIG. 2.
FIG. 2.

Magnetic field intensity contours in four azimuthal planes (). Gray dashed lines represent the projection of the magnetic field lines. Tilting angle .

Image of FIG. 3.
FIG. 3.

Temporal evolution of the ion spatial coordinates. Multiple time scales are at play; the classic azimuthal motion periodicity observed in magnetic mirror is accompanied by radial and longitudinal displacement because of the magnetic field non axi-symmetry.

Image of FIG. 4.
FIG. 4.

Poincaré plot in the longitudinal mid-plane. The solid blue line is the magnetic surface passing by , the black dotted line is the ion orbit, and the red dashed line is the circle of radius .

Image of FIG. 5.
FIG. 5.

Temporal evolution of the ion radial coordinate when crossing the z = 0 plane. Non axi-symmetry is responsible of the radial drift of the particle. Error bars correspond to the ion Larmor radius. The vertical dashed-dotted lines indicate the particle azimuthal position. The red and green curves are, respectively, the radial displacement induced by the gradient and the curvature drift. The solid blue curve is the radial displacement induced by the non circular profile of the magnetic surface in the longitudinal mid-plane.

Image of FIG. 6.
FIG. 6.

Temporal evolution of the ion radial coordinate when crossing the z = 0 plane. . Azimuthal trapping in a given half of the domain allows the particle to reach large radial position in the mid-plane as compared to the passing orbits.

Image of FIG. 7.
FIG. 7.

Poincaré plot in the longitudinal mid-plane. The blue solid line is the magnetic surface passing by , the red dashed line is the circle r = 0.2, the black dashed-dotted line delimits the two half domains, and the black dotted lines are the ion orbits for different initial positions on the magnetic surface. The drift is counter-clockwise and the curvature drift is clockwise. .

Image of FIG. 8.
FIG. 8.

Poincaré plot in the longitudinal mid-plane. The blue solid line is the magnetic surface passing by , the red dashed line is the circle r = 0.2, and the black dotted lines are the ion orbits for different initial positions on the magnetic surface. .

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/content/aip/journal/pop/19/11/10.1063/1.4765692
2012-11-06
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Particle deconfinement in a bent magnetic mirror
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/11/10.1063/1.4765692
10.1063/1.4765692
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