Showing papers by "Bobby Antony published in 2022"

DC Breakdown Characteristics of C₄F₇N/CO₂ Mixtures With Particle-in-Cell Simulation

Abstract: The breakdown characteristics of C₄F₇N/CO₂ mixtures under dc condition are investigated with a particle-in-cell method. The processes of elastic, excitation, ionization, and attachment collisions are all considered. The elastic cross section of electron scattering from C₄F₇N is modeled through quantum mechanical spherical complex optical potential formalism. Based on the cross-sectional data, the dielectric strength of pure C₄F₇N is studied. The threshold of breakdown is in good agreement with the experiment. Besides, the dielectric strength of C₄F₇N/CO₂ mixtures is also obtained. The threshold of breakdown in 80% C₄F₇N and 20% CO₂ is larger than that of pure C₄F₇N when the gas pressure is larger than 1300 torr. The results show that the energy loss of electrons is mainly caused by excitation collision with CO₂ when the energy of electrons ${T}_{e}$ is smaller than 5.5 eV. When ${E}/{P}$ is small, the proportion of low-energy electrons is large and ${T}_{e}$ increases with the ratio of C₄F₇N. Therefore, the effective ionization rate first decreases and then increases as the ratio of C₄F₇N increases.