Self-organized filaments in dielectric barrier glow discharges

Self-organized pattern formation of an atmospheric pressure plasma jet in a dielectric barrier discharge configuration

“…Each of the channels has a width of a few millimeters, clearly contrasting the typical submillimetersized filaments observed in the previous studies. 1, [8][9][10][11][12][13][14][15] The distance between two adjacent plasma channels is about 9 mm in Fig. 2͑b͒.…”

“…1 Pattern formations have been observed in many nonlinear and nonequilibrium systems. [2][3][4][5][6][7][8][9][10][11][12][13][14][15] Dielectric barrier discharge ͑DBD͒ is a typical nonlinear and nonequilibrium system, in which different discharge modes, referred to as filamentary, self-organized patterned, or diffuse discharges, can be obtained at atmospheric pressure by controlling the experimental conditions. The filamentary mode is characterized by a large number of short-lived microdischarge channels with a nanosecond time scale.…”

“…6,7 In the past two decades, the understanding of pattern formation in DBD has been broadened with experimental observations of a large variety of self-organized patterns including hexagon, strip, spiral, and concentric ring patterns. 1, [8][9][10][11][12][13][14][15] These are formed between two parallel electrodes immersed in a static atmospheric gas and their basic constituent elements tend to have a submillimeter diameter. Studies of pattern formations are important for DBDs, not only because of their intriguing similarities with those in other scientific disciplines but also because of their potential to uncover a previously uncharted operating regime that offers active plasma chemistry and stability simultaneously.…”

Computational algorithms for multiphase magnetohydrodynamics and applications to accelerator targets

“…After the hyperbolic step, the elliptic problem for the electric potential (6,8) is solved using the embedded-boundary method [24] (see [25] for the latest development of the embedded-boundary method for 3D moving elliptic-interface problems with front tracking). High-performance, parallelsoftware libraries of preconditioners and iterative solvers based on Krylov subspace methods such as PETSC [26] are used for solving the corresponding linear system of equations, and the electromagnetic terms are calculated.…”

“…The majority of numerical studies of free-surface MHD flows are based on semi-analytical treatment of simplified flow regimes [4,5]. Simplified models have successfully been used for the description of self-organized filaments in dielectric barrier-glow discharges [6,7] and the numerical modeling of micro-plasma instabilities [8]. But analytical models have a limited applicability for complex systems involving strongly coupled multi-physics phenomena.…”