Controlling the collimation and rotation of hydromagnetic disc winds

We present a comprehensive set of axisymmetric, time-dependent simulations of jets from Keplerian discs whose mass loading as a function of disc radius is systematically changed. For a reasonable model for the density structure and injection speed of the underlying accretion disc, mass loading is determined by the radial structure of the magnetic field of the disc. We vary this structure by using four different magnetic field configurations, …