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The effect of shear on the growth of large scale magnetic fields in helicalturbulence is investigated. The resulting large-scale magnetic field is alsohelical and continues to evolve, after saturation of the small scale field, ona slow resistive time scale. This is a consequence of magnetic helicityconservation. Because of shear, the time scale needed to reach anequipartition-strength large scale field is shortened proportionally to theratio of the resulting toroidal to poloidal large scale fields.

Sheared Helical Turbulence and the Helicity Constraint in Large-Scale Dynamos