Abstract
Transient plasma currents are excited with pulsed electrodes in a large laboratory plasma in a parameter regime characterized by electron magnetohydrodynamics (${\ensuremath{\omega}}_{\mathrm{ce}}^{\ensuremath{-}1}\ensuremath{\ll}\frac{{t}_{\mathrm{pulse}}}{2\ensuremath{\pi}}\ensuremath{\ll}{\ensuremath{\omega}}_{\mathrm{ci}}^{\ensuremath{-}1}$). The combination of Hall currents and field-aligned currents gives rise to three-dimensional vortices whose helicity is manifested by linked and knotted current and field lines. The relation between magnetic helicity, $\ensuremath{\int}\mathrm{A}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{B}\mathrm{dV}$, current helicity, $\ensuremath{\int}\mathrm{J}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{B}\mathrm{dV}$, and their transport properties are investigated.
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