Development of a Re-Deployable Radiator Demonstration Model for Deep Space Explorer

Next-generation deep space missions, especially small spacecraft exploring outer planets, will require technology that minimizes heater power consumption. To address this need, we are developing a re-deployable radiator, referred to as the Reversible Thermal Panel (RTP). This device autonomously deploys or stows the radiator surface in response to the temperature variations in the heat source. The radiator surface remains stowed at low temperatures to minimize the heat dissipation, and is deployed at high temperatures to enhance heat dissipation. The proposed design employs shape memory alloys (SMAs) as reversible actuators to enable autonomous thermal control. The RTP incorporates lightweight graphite sheets with high thermal conductivity to improve specific heat dissipation. Japan's deep space exploration demonstrator, DESTINY+, will demonstrate future exploration technologies. The RTP is planned to be mounted as one of the demonstration devices. For the on-orbit demonstration using DESTINY+, we have developed a Reversible Thermal Panel Demonstration Model (RTP-DM) with a mass of approximately 1.2 kg and a heat radiation capability exceeding 100 W. This paper presents the design, fabrication, and testing results of the RTP-DM.