全天 X 線監視装置 (MAXI) 搭載ループヒートパイプ

抄録

This report presents an introduction to loop heat pipes (LHP). Fundamental characteristics of LHP are described in comparison with conventional heat pipes. Following a brief explanation of the operating principle of LHP, the focus is placed on a unique implementation of LHP, the MAXI loop heat pipe radiator system (LHPRS). Since August 2009, LHPRS is working as the heat transporting system to reject heat from the X-ray CCD camera (SSC) of Monitor of All-sky X-ray Image (MAXI) onboard the International Space Station. LHPRS has two separate radiators operating under transient thermal conditions. A brief examination of the flight data shows no performance degradation of LHPRS. The importance of subcooling is stressed for understanding the working principle of the startup and shut-off heaters of LHPRS. This report may be useful for potential LHP users.