On reflection of ion acoustic waves

Reflection of ion acoustic waves from a bipolar potential structure was studied in a double plasma device. The existence of a reflected signal, even when no external bias was applied on the bipolar reflector, could be detected, although with much lower velocity than the incident wave. Application of proper bias on such a reflector resulted in an additional reflected image with greater velocity than the reflection obtained without bias. The experiment was also extended to study negative ion plasma waves.