Abstract
The Fisk Plasma Source (FPS) is a plasma device operating at Fisk University. Dusty plasmas in the FPS device are produced by suspending 40 μm diameter silica (SiO2) particles in an argon dc (direct current) glow discharge plasma. Experiments are performed at pressures ranging from 90 to 150 mTorr. A 20 mW HeNe laser is used to illuminate the dust particles. Langmuir probes and video images are used to diagnose the charging and confinement of the dust particles in the plasma. A modified version of the dust grain charging model is developed and is used to estimate the charge. The silica particles are shown to become negatively charged in the plasma with up to 105 electrons. The presence of the negatively charged dust grains is correlated to a reduction in the electron saturation current in the plasma.
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