Role of deflection magnetic field in hydrogen ionic plasma formation

In this study, hydrogen electron plasma is irradiated on an aluminum plate, and negative hydrogen ions are produced on the plate surface. Hydrogen ionic plasma is maintained near the surface, where a deflection magnetic field is applied using a pair of magnets in the vicinity of the surface. When no magnetic field is applied, ionic plasma is not formed. The interface position between the ionic and the electron plasma depends on the quantity of negative ions produced and the deflection magnetic flux density. The deflection magnetic field that controls the electron flux toward the surface, while maintaining quasi-neutrality, is indispensable for the formation of ionic plasma.