Lower hybrid drift waves in a plasma with negative ions

The dispersion relation for the lower hybrid drift mode is analytically obtained for a warm plasma containing negative ions. It is found that the lower hybrid drift frequency is directly proportional to the population density of negative ions. Moreover, it is found that the growth rate of the lower hybrid drift instability can be controlled by appropriate selection of the density inhomogeneity scale length, the external magnetic field and the number density of negative ions. (Author)