Effects of external magnetic field ripple on FRC equilibrium
The two-dimensional equilibrium of Field-Reversed Configuration (FRC) plasma in presence of an external ripple magnetic field is computed to show the emergence of multiple magnetic axes for hollow equilibrium current profiles. An increase in ripple amplitude reduces the hollowness threshold required for the development of multiple magnetic axes. For an intermediate range of the ripple axial period, the formation of multiple magnetic axes becomes the most likely. The ripple's radial extension and the curvature of the axial field are the critical factors underlying the non-monotonic effect of ripple's axial period. When the axial period increases from the lower range, the ripple's radial extension gradually grows and enhances the chance of forming multiple magnetic axes. Once the ripple's radial extension covers the entire radial domain, further increasing the ripple axial period decreases the ripple field curvature, which becomes the dominant factor for lowering the hollowness threshold for the formation of multiple magnetic axes.