Schedule 4 [S191p-06] Optimal diffuser geometry for micro-scale high altitude test stand 〇Yamato Itoigawa1, Ryo Onodera1, Gieuseppe Gallo1, Landon Kamps2, Harunori Nagata1 (1. 北海道大学大学院工学院、2. Letara 株式会社) Keywords:Second Throat Ejector Diffuser、High Altitude Test Stand、Hybrid Rocket Motor