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Two in-situ experimental methods are presented in which dust particles areused to determine the extent of the sheath and gain information about thetime-averaged electric force profile within a RF plasma sheath. These methodsare advantageous because they are not only simple and quick to carry out, butthey also can be performed using standard dusty plasma experimental equipment.In the first method, dust particles are tracked as they fall through the plasmatoward the lower electrode. These trajectories are then used to determine theelectric force on the particle as a function of height as well as the extent ofthe sheath. In the second method, dust particle levitation height is measuredacross a wide range of RF voltages. Similarities were observed between the twoexperiments, but in order to understand the underlying physics behind theseobservations, the same conditions were replicated using a self-consistent fluidmodel. Through comparison of the fluid model and experimental results, it isshown that the particles exhibiting a levitation height that is independent ofRF voltage indicate the sheath edge - the boundary between the quasineutralbulk plasma and the sheath. Therefore, both of these simple and inexpensive,yet effective, methods can be applied across a wide range of experimentalparameters in any ground-based RF plasma chamber to gain useful informationregarding the sheath, which is needed for interpretation of dusty plasmaexperiments.

Using Dust as Probes to Determine Sheath Extent and Structure