Fig. 7: Side view of the plasma chamber.
From: Decoupling of dust cloud and embedding plasma for high electron depletion in nanodusty plasmas
A generator in series with a match box (MB) and balun drives the electrodes with a rf signal of 13.56 MHz. The balun symmetrizes the signal. Gas is fed into the chamber on top and pumped out on the bottom. For simplicity only the vertical, expanded laser stripe is shown (it is laser L1 in the experimental setup). The light scattered from L1 produces an image of a 2D cross section of the cylindrically symmetric dust cloud.
