Magnetic traps
0° baseball trap
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Baseball 0.biot |
A baseball trap is a magnetic trap for plasma that is wound in the shape of the seam of a baseball.
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This file contains a Wire object describing the baseball coil, three Wire objects with zero current marking the x, y, and z axes, and a Linear probe along the z-axis. The probe result (magnitude of magnetic flux density, B) is shown below:
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20° baseball trap
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Baseball 20.biot |
By changing the angles in the winding of a baseball trap, it is possible to vary the field in the center of the trap, and thereby get a deeper or shallower magnetic trap.
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This file contains a Wire object describing the baseball coil, three Wire objects with zero current marking the x, y, and z axes, and a Linear probe along the z-axis. The probe result (magnitude of magnetic flux density, B) is shown below:
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A two-coil trap
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Bergeman fig 2.biot |
This trap is an anti-Helmholtz configuration from Bergeman et al.
T. Bergeman et al, Phys. Rev. A, 35 (1987) 1535.
This file contains a Loop object describing the two coils, and a Planar probe calculating the contour plot of the magnetic trapping potential (here just the magnitude of the magnetic flux density, B).
A three-coil trap
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Bergeman fig 6.biot |
This trap is an three-coil configuration from Bergeman et al.
This file contains a Loop object describing the three coils, and a Planar probe calculating the contour plot of the magnetic trapping potential (here just the magnitude of the magnetic flux density, B).
A Ioffe trap
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Bergeman fig 7.biot |
This trap is Ioffe configuration from Bergeman et al. This configuration consists of four current-carrying bars (the red and green bars) and two loops with non-opposing currents. This produces a magnetic trap with nonzero magnetic field at the minimum.
This file contains, in addition to the conductors, two Planar probes calculating the contour plots of the magnetic trapping potential (here just the magnitude of the magnetic flux density, B).
