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Pulsed Ion Sheath Dynamics in a Cylindrical Bore for Inner Surface Grid—Enhanced Plasma Source Ion Implantation

Chinese Physics Letters 2002年第10期19卷 1473-1475页

作者：王久丽杨思泽等 InstituteofPhysics ChineseAcademyofSciencesBeijing100080 StateKeyLaboratoryforMaterialsModificationbyLaser IonandElectronBeamsDalianUniversityofTechnologyDalian116024

Based on our recently proposed grid-enhanced plasma source ion implantation (GEPSII) technique for inner surface modification ofmaterials with cylindrical geometry, we present the corresponding theoretical studies of the temporal evolution of the plasma ion sheathbetween the grid electrode and the target in a cylindrical bore. Typical results such as the ion sheath evolution, time-dependent ion densityand time-integrated ion energy distribution at the target are calculated by solving Poisson's equation coupled with fluid equations forcollisionless ions and Boltzmann assumption for electrons using finite difference methods. The calculated results can further verify thefeasibility and superiority of this new technique.

关键词： Grid new technique CIRCULAR APERTURE Targets sheaths Poisson equation Ion energy distribution Plasma source ion implantation Ions

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ARTIFICIAL AGING TESTS WITH DEFECTIVE COMPOSITE INSULATORS 19th

ARTIFICIAL AGING TESTS WITH DEFECTIVE COMPOSITE INSULATORS

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： B.LUTZ F.LIANG J.ZHANG Z.GUAN L.WANG Laboratory of Advanced Technology of Electrical Engineering and Energy Graduate School at ShenzhenTsinghua University

ISBN: (纸本)9771003651221

＜正＞In this study,artificial aging tests with composite insulators containing different defects at the sheath-core interface were *** including copper strips,wood strips and weak adhesion between sheath and core were *** samples were stressed by a stepwise increasing AC test voltage while the leakage current and the surface temperature were *** effect of the defect type,defect length and of absorbed water on the aging process was investigated in dry environment. In case that the leakage current exceeded 0.2 mA, samples containing wetted or conductive defects exhibited a significant increase of surface *** highest temperature developed at the defects’ edges near to the ground electrode where puncturing of the silicone rubber sheath finally *** puncturing mechanism is critical for the long-term performance of composite insulators since further aging mechanisms may be triggered afterwards.

关键词： composite insulators surface temperature leakage currents Grounding electrodes dry conditions Hygroscopic Water insulators Composites aging mechanism sheaths Accelerated aging

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