abstract
- A theoretical and experimental study of a low-temperature DC glow discharge in the annular region of coaxial cylinders is presented. Plasma density was modified by varying the applied voltage and the neutral gas pressure. The ion density, mean electron energy, and plasma potential profiles were reconstructed through local measurements with the Langmuir probe technique along the radial direction. A one-dimensional asymptotic solution of a low-temperature plasma is presented that considers nonlinear effects and non-constant electronic temperature, which are neglected in most analytical solutions found in the literature. Additionally, a high-order spectral numerical solution was developed. Both analytical and numerical results agree qualitatively with the experimental observations. © 2025 Elsevier Ltd