[P-EM11] Dynamics of Magnetosphere and Ionosphere

[PEM11-30] Development of a miniaturized X-ray imager for GEOspace X-ray imager (GEO-X)

*石川 久美¹、江副 祐一郎²、沼澤 正樹²、伊師 大貴²、藤谷 麻衣子²、大坪 亮太²、福島 碧都²、鈴木 光²、湯浅 辰哉²、中嶋 大³、平賀 純子⁴、三好 由純⁵、笠原 慧⁶、満田 和久¹ (1.宇宙航空研究開発機構/宇宙科学研究所、2.首都大学東京、3.関東学院大学、4.関西学院大学、5.名古屋大学、6.東京大学)

キーワード：X線、磁気圏

A reduction in weight of instrument, especially optics, is a key technique for explorers or small satellite missions. GEO-X (GEOspace X-ray imager) is a Japanese small satellite mission for X-ray observations
of the dayside boundaries of the Earth’s magnetosphere. An instrument is composed of a X-ray telescope
and a radio hard semiconductor pixel detector. Conventional X-ray optics have a trend that optics with better angular resolution have larger ratio of the weight to effective area. Therefore, it is difficult to utilize them for the X-ray planetary mission which has a severe weight limit. Micro pore optics are being developed based on a concept of a miniature optics. An original micro pore optics based on Si micromachining technologies will be used. A CMOS image sensor and a DEPFET (DEPleted P-Channle FET) are candidates for the X-ray detector. These new type semiconductor detectors are radiation hard and have optical light resistance, which are crucial in GEO-X to observe magnetosheaths and cusps near the dayside of the Earth. We report a summary of the instrument design and development for GEO-X.