イメージスキャナを用いた平板C/Cグリッド孔径の統計的分析 (イオン加速グリッド耐久認定用数値解析 JIEDI(JAXA Ion Engine Development Initiatives) ツールの研究開発ワークショップ論文集)

概要

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The erosion of accelerator grid aperture due to impingement of charge-exchange ions limits the normal operation of the microwave discharge ion engine, in which long life and high reliability are inherent because of electrode-less plasma generations. A commercially available image scanner and image-analysis software enabled to statistically analze the diameters of the huge number of apertures in the fl at C/C grids. This measurement method was applied to the accelerator grids of μ10 ion engine after the 20,000 hour endurance test and μ20 ion engine under ion machining in 30 hours. As a result, it was revealed that the erosion distribution of the μ10 grid had the azimuthal dependence. Moreover, we obtained the design guide for the next μ20 accelerator grid, to make the apertures with tapered shape on the side of upstream.