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The collisional dynamics of test impurity ions in spherical tokamak plasmaswith strongly-sheared radial electric fields is investigated by means of a testparticle full orbit simulation code. The strength of the shear is such that thestandard drift ordering can no longer be assumed and a full orbit approach isrequired. The effect of radial electric field shear on neoclassical particletransport is quantified for a range of test particle mass and charge numbersand electric field parameters. It is shown that the effect of a shearedelectric field is to enhance the confinement of impurity species above thelevel observed in the absence of such a field. The effect may be explained interms of a collisional drag force drift, which is proportional to particlecharge number but independent of particle mass. This drift acts inwards fornegative radial electric fields and outwards for positive fields, implyingstrongly enhanced confinement of highly ionized impurity ions in the presenceof a negative radial electric field.

Full orbit simulations of collisional impurity transport in spherical tokamak plasmas with strongly-sheared electric fields