A self-consistent hybrid model of kinetic striations in low-current argon discharges
نویسندگان
چکیده
Abstract A self-consistent hybrid model of standing and moving striations was developed for low-current DC discharges in noble gases. We introduced the concept surface diffusion phase space ( r , u ) (where denotes electron kinetic energy) described by a tensor nonlocal Fokker–Planck equation electrons collisional plasma. Electrons diffuse along surfaces constant total energy ? = ? e? between jumps inelastic collisions with atoms. Numerical solutions 1d1u were obtained two methods coupled to ion transport Poisson solver. studied dynamics striation formation Townsend glow argon gas at low discharge currents using two-level excitation-ionization ‘full-chemistry’ model, which includes stepwise Penning ionization. Standing appeared currents, exceeding critical value. These waves originate anode propagate towards cathode. have seen types full-chemistry models, resemble s p previously observed experiments. Simulations indicate that processes region could control positive column The helps clarify nature gases pressures.
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Self-consistent system of equations for a kinetic description of the low-pressure discharges accounting for the nonlocal and collisionless electron dynamics.
In low-pressure discharges, where the electron mean free path is larger or comparable with the discharge length, the electron dynamics is essentially nonlocal. Moreover, the electron energy distribution function (EEDF) deviates considerably from a Maxwellian. Therefore, an accurate kinetic description of the low-pressure discharges requires knowledge of the nonlocal conductivity operator and ca...
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ژورنال
عنوان ژورنال: Plasma Sources Science and Technology
سال: 2022
ISSN: ['1361-6595', '0963-0252']
DOI: https://doi.org/10.1088/1361-6595/ac4b68