Experimental studies of plasma sheath near meshes of different transmissivity

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

中国物理B ›› 2010, Vol. 19 ›› Issue (8): 85201-085201.doi: 10.1088/1674-1056/19/8/085201

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇下一篇

Experimental studies of plasma sheath near meshes of different transmissivity

李毅人, 马锦秀, 郑尧邦, 张文贵

Key Laboratory of Basic Plasma Physics and Center for Magnetic Fusion Theory, Chinese Academy of Sciences, and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

收稿日期:2009-12-25 修回日期:2010-02-05 出版日期:2010-08-15 发布日期:2010-08-15
基金资助:
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).

Experimental studies of plasma sheath near meshes of different transmissivity

Li Yi-Ren(李毅人), Ma Jin-Xiu(马锦秀)^†ger, Zheng Yao-Bang(郑尧邦), and Zhang Wen-Gui(张文贵)

Key Laboratory of Basic Plasma Physics and Center for Magnetic Fusion Theory, Chinese Academy of Sciences, and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

Received:2009-12-25 Revised:2010-02-05 Online:2010-08-15 Published:2010-08-15
Supported by:
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).

摘要/Abstract

摘要： 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.

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.

Key words: plasma sheath, presheath, mesh, emissive probe

中图分类号: (Plasma sheaths)

52.40.Kh

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

李毅人, 马锦秀, 郑尧邦, 张文贵. Experimental studies of plasma sheath near meshes of different transmissivity[J]. 中国物理B, 2010, 19(8): 85201-085201.

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[J]. Chin. Phys. B, 2010, 19(8): 85201-085201.

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Experimental studies of plasma sheath near meshes of different transmissivity

Experimental studies of plasma sheath near meshes of different transmissivity

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