Arc Heating Wind Tunnel Facility in ISAS/Japan and the activity to update and improve it for Further Sample Return Missions

Arc heating wind tunnel in JAXA/ISAS was established in 1996 for development of HAYABUSA reentry capsule. The facility has the strongest power with 1 MW with high enthalpy in Japan and it has been utilized for various researches and development of USERS and HAYABUSA2 after HAYABUSA development. The facility has been one of the inter-university facilities from 2014 and now it is utilized for various kind of researches like new ablator invention, artificial meteors and ablation sensor development by the university researchers in all over the Japanese universities. HAYABUSA2 was launched in 2014 and the following project to go and return from the asteroids on the orbit of Jupiter is on the plan. The heat flux HAYABUSA experienced during the reentry was estimated 15MW/m2, but it is estimated over 30MW/m2 the capsule will experience from Jupiter. For the development of the capsule, we plan to increase the heat flux by adding laser power. The heat flux at stagnation point that specimen suffer is determined by the distance from the nozzle exit of heater and the relationship between the distance and the heat flux is organized and provide for users reference. The impact pressure at stagnation point is also organized and provided. Our current activity is clarify the characteristic of the arc tunnel in detail. We developed the multi-point pressure sensor recently to acquire the surface distribution of impact pressure around the stagnation point of the specimen. It will be better to acquire to get the distribution of the heat flux. It is under consideration.