Abstract
A ferromagnetic-enhanced inductively coupled plasma source consisting of a narrow U-shaped gas discharge tube and a large chamber has been investigated. The effect of chlorine admixture with argon on the discharge properties was studied both experimentally and numerically. The discharge electric field strength and gas temperature were measured in chlorine concentrations of 0%–4% and discharge current densities of 0.2–1.5 A cm−2. The appearance of discharge instabilities was noticed at current densities below 1 A cm−2. A global model of Cl2/Ar discharge was modified and used to describe basic features of plasma in the U-shaped tube. The plasma composition, energy balance terms and electric field strength values were calculated, and satisfactory agreement between the experimental and numerical data was found. A possible approach to decrease the U-shaped tube’s power losses and the mechanism of the instabilities’ formation are discussed.
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