کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
271120 504989 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Initial damage processes for diamond film exposure to hydrogen plasma
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
Initial damage processes for diamond film exposure to hydrogen plasma
چکیده انگلیسی


• Exposing chemical vapour deposited (CVD) diamond films in a recently constructed device, MAGPIE, specially commissioned to simulate fusion plasma conditions.
• Non-diamond material is etched from the diamond.
• There is no hydrogen retention observed, which suggests diamond is an excellent candidate for plasma facing materials.
• Final structure of the surface is dependent on synergistic effects of etching and ion-induced structural change.

Diamond is considered to be a possible alternative to other carbon based materials as a plasma facing material in nuclear fusion devices due to its high thermal conductivity and resistance to chemical erosion. In this work CVD diamond films were exposed to hydrogen plasma in the MAGnetized Plasma Interaction Experiment (MAGPIE): a linear plasma device at the Australian National University which simulates plasma conditions relevant to nuclear fusion. Various negative sample stage biases of magnitude less than 500 V were applied to control the energies of impinging ions. Characterisation results from SEM, Raman spectroscopy and ERDA are presented. No measureable quantity of hydrogen retention was observed, this is either due to no incorporation of hydrogen into the diamond structure or due to initial incorporation as a hydrocarbon followed by subsequent etching back into the plasma. A model is presented for the initial stages of diamond erosion in fusion relevant hydrogen plasma that involves chemical erosion of non-diamond material from the surface by hydrogen radicals and damage to the subsurface region from energetic hydrogen ions. These results show that the initial damage processes in this plasma regime are comparable to previous studies of the fundamental processes as reported for less extreme plasma such as in the development of diamond films.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fusion Engineering and Design - Volume 88, Issue 12, December 2013, Pages 3101–3107
نویسندگان
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