Theta pinch
= Theta pinch
{title2=$\mathbf B=B(r)\hat{\mathbf z}$}
A <theta pinch> is a cylindrical plasma configuration with axial <magnetic field> and azimuthal <electric current>. For a static equilibrium without gravity, the radial <Lorentz force> gives $d[p+B^2/(8\pi)]/dr=0$ in <Gaussian units>. This straight-field configuration has no field-line curvature drive of the usual interchange instability.