Study on a gas discharge pattern with discharge gap of the D<sub>2h</sub> symmetry
Abstract
<p indent="0mm">The pattern with discharge gap of D<sub>2h</sub> symmetry is obtained in dielectric barrier discharge for the first time. The discharge gap belonged to D<sub>2h</sub> point group is consisted of four striped structures which is made up circles and rectangles. The evolution of the pattern with this discharge gap is from D<sub>4h</sub> to D<sub>2h</sub> through self-organization. The device also achieves a tunable plasma photonic crystal. The spatial-temporal structure in circular areas investigated by an intensified charge coupled device camera (ICCD) shows that it is an interleaving of three different sublattices, which are central spots, spots on the boundary, circular halos, respectively. The circular halos investigated by a high-speed video camera show that the halos are randomly filaments. The plasma parameters of different sublattices are studied by a spectrograph. The formation mechanisms of the pattern and the circular halos are analyzed by wall charges theory.</p>
