  Small number dust particle clusters can be used as probes for plasma
diagnostics. The number of dust particles as well as cluster size and shape can
be easily controlled employing a glass box placed within a GEC rf reference
chamber to provide confinement of the dust. The plasma parameters inside this
box and within the larger plasma chamber have not yet been adequately defined.
Adjusting the rf power alters the plasma conditions causing structural changes
of the cluster. This effect can be used to probe the relationship between the
rf power and other plasma parameters. This experiment employs the sloshing and
breathing modes of small cluster oscillations to examine the relationship
between system rf power and the particle charge and plasma screening length
inside the glass box. The experimental results provided indicate that both the
screening length and dust charge decrease as rf power inside the box increases.
The decrease in dust charge as power increases may indicate that ion trapping
plays a significant role in the sheath.
