[P-CG20] 宇宙・惑星探査の将来計画および関連する機器開発の展望

[PCG20-P08] A low-energy particle experiment for both ion and electron measurements using a single microchannel plate-based detector

*横田 勝一郎¹、斎藤 義文²、浅村 和史² (1.大阪大学・理学研究科、2.宇宙航空研究開発機構・宇宙科学研究所)

キーワード：静電分析器、宇宙プラズマ計測、SS520-3号機ロケット、イオン電子観測、マイクロチャンネルプレート

We have developed a low-energy particle experiment that alternately measure ions and electrons in space. The ability to switch between ion and electron measurements is achieved by simply adding ultra-thin carbon foil and positive and negative outputs to a conventional top-hat electrostatic analyzer and a high-voltage power supply, respectively. The advantage of this experiment is that it can perform both ion and electron measurements using only one MCP-based detector for electrons, since it detects secondary electrons emitted from the carbon foil. For the SS520-3 sounding rocket program, we prepared two identical energy analyzers, one for ions and the other for electrons to demonstrate this technique. Laboratory tests confirmed that the performance of the two analyzers was comparable to that of conventional analyzers for ion and electrons. The SS520-3 rocket experiment in the high latitude auroral region yielded observations that captured typical features of ions and electrons, which were similar to previous observations.