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In a capacitively coupled radio-frequency dusty plasma discharge, the groove structure on the lower electrode significantly modulates the electric potential distribution within the sheath region, thereby strongly influencing the collective dynamics of dust particles. Experimentally, when micrometer-sized dust particles are injected into the discharge chamber, a clearly stratified suspension forms above the potential well created by the electrode groove, exhibiting a characteristic 'bowl-shaped' cloud structure. The macroscopic dimensions of the dust cloud, such as its vertical thickness and radial expansion, vary noticeably with changes in RF power and gas pressure. Moreover, a dust void is observed in the central region of each particle layer; its diameter and evolution are jointly determined by the dust particle density, RF power, and gas pressure. A hybrid model, which couples a fluid description with the equation of motion for dust particles, indicates that the suspension and arrangement of dust particles are predominantly determined by a balance of axial and radial forces. The axial forces include the electrostatic force from the sheath electric field, the ion drag force, and gravity, while the radial forces primarily arise from the radial component of the electric field and the corresponding ion drag force. Further experimental results show that applying a negative DC bias to the RF electrode causes the levitation height of the dust particles to first increase and then decrease with increasing bias voltage, exhibiting a non-monotonic trend. This shift in levitation height can be regarded as a clear indicator of the transition of the plasma discharge from the α-mode to the γ-mode.
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