What is the size of a floating sheath? An answer

Farina Voigt, Schabnam Naggary, Ralf Peter Brinkmann

69th An­nual Ga­se­ous Elec­tro­nics Con­fe­rence, Bo­chum, Ger­ma­ny, Oc­to­ber 11, 2016.


The formation of a non-neutral boundary sheath in front of material surfaces is universal plasma phenomenon. Despite several decades of research, however, not all related issues are fully clarified. In a recent paper, Chabert pointed out that this lack of clarity applies even to the seemingly innocuous question ``What the size of a floating sheath?'' [Plasma Sources Sci. Technol. 23 (2014) 065042] This contribution attempts to provide an answer that is not arbitrary: The size of a floating sheath is defined as the plate separation of an equivalent parallel plate capacitor. The consequences of the definition are explored with the help of a self-consistent sheath model, and a comparison is made with other sheath size definitions.

tags: floating-sheath