Abstract
Presented here is an image of a microwave air plasma produced from a 2.45-GHz source. To assist in the plasma ignition and confinement, a set of samarium-cobalt (Sm-Co) permanent magnets arranged in a double-hexapole configuration is used. In the image presented, air in the vacuum chamber is ignited into the plasma at a pressure of 3 × 10-3 torr. The plasma exhibits a distinct pattern where brighter areas appear at alternate regions of magnetic cusps. Based on particle-in-cell simulations, the bright areas coincide with regions where the electron energies and electron densities are relatively high.
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