Sheath Criterion for a Collisional Electronegative Plasma Sheath in an Applied Magnetic Field

The sheath criterion for a collisional electronegative plasma sheath in an applied magnetic field is investigated. It is assumed that the system consists of hot electrons, hot negative ions and cold positive ions. The effect of an applied magnetic field on the sheath criterion is discussed. The results reveal that the magnetic field has effects on both the upper and lower limits, which cause the range of the ion Mach number to increase. In addition, the numerical calculations of the electronegative plasma sheath are carried out to demonstrate the effects of sheath criterion on the characteristics of the sheath.