Bohm sheath criterion associated with magnetized collisional warm plasma containing secondary electrons and negative ions

Abstract Using Sagdeev potential approach the modified Bohm’s criterion is evaluated for magnetized electronegative warm plasma containing secondary electrons. Dependency of Bohm velocity on electrons, inclination angle magnetic field, collisionality, electronegativity and temperature ratio (electron to positive ions) are examined. found be independent magnitude field but depends its incidence angle. As increases at edge sheath gets reduced.