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Two-dimensional plasma sheath observations in plasma source ion implantation.

dc.contributor.advisorAlport, Michael J.
dc.contributor.authorMeyer, Kevin Alan.
dc.date.accessioned2012-02-10T13:19:32Z
dc.date.available2012-02-10T13:19:32Z
dc.date.created1996
dc.date.issued1996
dc.descriptionThesis (M.Sc.)-University of Natal, Durban, 1996.en
dc.description.abstractPlasma Source Ion Implantation (PSII) is the process of implanting high energy ions [10-50 keV] into metallic targets, by pulsing them negatively whilst immersed in a background plasma. PSII achieves surface hardening, and increased wear and corrosion resistance. Numerous papers have been published describing numerical simulations and models of the PSII process, most of which have been limited to one dimension. This thesis presents the results of work carried out III the Plasma Processing Laboratory at the University of Natal, Durban, during 1994-1995. In particular, measurements of two-dimensional plasma sheath effects due to spherical and complex shaped targets are compared with a particle-in-cell simulation code. The simulation results are used to define a relationship between the plasma potential of the sheath edge and the saturation currents. Thus allowing for the saturation currents to be used to trace sheath evolution. These results are compared with the experimental measurements from the spherical target. Results from the rectangular and complex saw-tooth targets show a lack of sheath conformality. The ion saturation currents were susceptible to electron swamping, which occured in localised regions associated with target structure. It is thought that secondary electrons ejected from the target are focused and accelerated by the high target potential into these regions, where they swamp the ion current.en
dc.identifier.urihttp://hdl.handle.net/10413/4981
dc.language.isoenen
dc.subjectPlasma (Ionized Gases)en
dc.subjectIon implantation.en
dc.subjectTheses--Physics.en
dc.subjectCorrosion and anti-corrosives.en
dc.titleTwo-dimensional plasma sheath observations in plasma source ion implantation.en
dc.typeThesisen

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