Experimental studies of plasma sheath near meshes of different transmissivity

doi:10.1088/1674-1056/19/8/085201

Abstract The measurements of the potential distributions in the boundary layer near meshes with different mesh spacing were conducted in weakly collisional plasmas using a fine-structured emissive probe and the results of the sheath thickness and electric field at the sheath-presheath edge were compared with theoretical models of collisional presheath and collisionless sheath. It was shown that, because the meshes are partially transparent to ions, the sheath is thinner and the electric field is stronger for the mesh of higher transmissivity, owing to the increased ion density in the sheath contributed from the ions transmitted from the other side of the mesh. However, the potential profiles in the presheath remain almost the same for different meshes except for the shift of the sheath-presheath edge. The thickness of the sheath decreases while the electric field at the edge increases with the increase of the neutral gas pressure. Furthermore, depending on the pressure, the measured electric fields at the edge are close to that from the models of a transition region.

Keywords: plasma sheath presheath mesh emissive probe

Received: 25 December 2009
Revised: 05 February 2010
Accepted manuscript online:

PACS:	52.40.Kh	(Plasma sheaths)
	52.40.Hf	(Plasma-material interactions; boundary layer effects)
	52.70.Ds	(Electric and magnetic measurements)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10875121 and 40831062), partially by CAS Knowledge Innovation Program (Grant No. kjcx2-yw-n28), and the National Basic Research Program of China (Grant Nos. 2008CB717800 and 2009GB105001).

Cite this article:

Li Yi-Ren(李毅人), Ma Jin-Xiu(马锦秀), Zheng Yao-Bang(郑尧邦), and Zhang Wen-Gui(张文贵) Experimental studies of plasma sheath near meshes of different transmissivity 2010 Chin. Phys. B 19 085201

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