[P-CG21] 宇宙・惑星探査の将来計画と関連する機器開発の展望

[PCG21-P09] ３次元電位分布計算による「みお」搭載MIAのトップハット分析器特性の非対称性の解釈

*三宅 亙¹、斎藤 義文²、横田 勝一郎³ (1.東海大学工学部、2.宇宙科学研究所、3.大阪大学)

キーワード：みお、トップハット静電分析器、水星イオン分析器

MIA (Mercury Ion Analyzer) on board Mio employs a top-hat electrostatic analyzer, which has axisymmetric toroidal electrodes and is designed to have no dependence in its characteristics on azimuthal direction of incident ions. However, our ground calibration experiments have revealed that it has a slight dependence. We have tried to explain the dependence by means of three dimensional model calculations. We assumes that all parts of electrode are manufactured precisely. Our results shows that a slight relative rotation (or tilt) of electrodes can lead to a slight dependence on incident azimuthal direction similar to that obtained from the ground experiments.