| Revista: | Revista mexicana de física E |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000427239 |
| ISSN: | 1870-3542 |
| Autores: | Martínez Fuentes, M.A1 Herrera Velázquez, J.J.E1 |
| Instituciones: | 1Universidad Nacional Autónoma de México, Instituto de Ciencias Nucleares, Ciudad de México. México |
| Año: | 2017 |
| Periodo: | Ene-Jun |
| Volumen: | 63 |
| Número: | 1 |
| País: | México |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico, teórico |
| Resumen en inglés | The expression for the Debye shielding in plasma physics is usually derived under the assumptions that the plasma particles are weakly coupled, so that their total kinetic energy is much greater than their electrostatic interaction energy, and that the velocity distributions of the plasma species are Maxwellian. The first assumption also establishes that the number of particles within a sphere with a Debye radius, known as the plasma parameter ND, should be significantly greater than 1, and determines the difference between weakly and strongly coupled plasmas. Under such assumptions, Poisson’s equation can be linearized, and a simple analytic expression is obtained for the electrostatic potential. However, textbooks rarely discuss the accuracy of this approximation. In this work we compare the linearized solution with a more precise numerical (or “exact”) solution, and show that the linearization, which underestimates the “exact” solution, is reasonably good even for ND ∼ 40. We give quantitative criteria to set the limit of the approximation when the number of particles is very small, or the distance to the test charge too short |
| Disciplinas: | Física y astronomía |
| Palabras clave: | Teoría cinética y plasmas, Física del plasma, Blindaje Debye, Electrostática |
| Keyword: | Kinetic theory and plasma, Plasma physics, Debye shielding, Electrostatics |
| Texto completo: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
