Schematic representation of helium generated plasma source.
Figures are generally photos, graphs and static images that would be represented in traditional pdf publications.
The plasma source used in the present study consisted of two coaxial tubes, the outer one made out of copper and the inner one made out of insulating material. Two parallel grids 1 mm away from one another closed the tubes. The electric field was formed in the space between the two grids by applying a RF voltage difference supplied by a radiofrequency (RF) generator coupled to the source by a matching network.