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. 2013 Apr 30;4:1785. doi: 10.1038/ncomms2787

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The potential well, for F=100, at the indicated times and at z=0. The flat-bottomed appearance of the well at early times results from the quadratic addition of the solenoidal field to the r³ dependent octupole field. (Here, r is the transverse radius .)

Inline graphic — The potential well, for F=100, at the indicated times and at z=0. The flat-bottomed appearance of the well at early times results from the quadratic addition of the solenoidal field to the r³ dependent octupole field. (Here, r is the transverse radius .)