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Theory of a stationary current-free double layer in a collisionless plasma
Eduardo Ahedo1, Manuel Martínez Sánchez
1Universidad Politécnica de Madrid, Madrid 28040, Spain. eduardo.ahedo@upm.es
Abstract:
Current-free double layers can develop in a collisionless, inertia-controlled plasma with two electron populations, expanding in a convergent-divergent nozzle. The double layer characteristics depend on whether they develop at the nozzle divergent side, convergent side, or throat. The divergent-geometry double layer describes faithfully the Hairapetian-Stenzel experiment [Phys. Rev. Lett. 65, 175 (1990)10.1103/PhysRevLett.65.175], whereas the two other types correspond with those studied in self-similar expansions and wall-collection models of similar plasmas.
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