Abstract
Summary form only given. A novel inductively coupled mid frequency (2 MHz) plasma source with orthogonal coil configuration is presented. The inductive coil consists of two perpendicular copper rod layers inside the chamber to improve the power transfer efficiency and uniformity of plasma. The results of magnetic field distribution under low and high plasma density are reported in detail. It shows that the radial uniformity of magnetic field and plasmas is enhanced significantly compared with that of external planar coil in 460 kHz frequency. Depending on the input power, the plasma source can operate in either the electrostatic (E) mode or electromagnetic (H) mode discharge. It is interesting that the mode transition can be continuous or discrete. The mode transition jump is obvious in 460 kHz with the same inductive coil and chamber. Furthermore, the required input power to initiate the discharge is observed remarkably low (10 W) in the present chamber with a volume of 18.5 litres
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