Thermal control system design and simulation of AMS-02 main radiator avionics

This paper is dedicated on the system-level thermal design and modeling for AMS-02 (Alpha Magnetic Spectrometer) avionics, with the goal of obtaining a reliable thermal control system. Electronics system thermal design is illustrated with the combination of both passive and active thermal control concepts. Detailed TMM (Thermal Mathematical Model) and GMM (Geometric Mathematical Model) for main radiator, embedded heat pipe, Crates, XPDs, PDS, thermostat-controlled heaters are created based on capacitor-resistance network and lump-parameter methods. The thermal design is verified by the transient thermal performance of all WAKE/RAM electronic units with 3 typical ISS operation scenarios---cooling down at power outage, switch on at worst cold case, nominal operation at extreme hot. Analysis results manifest all electronic units can survive and operate within their temperature specifications and the present thermal control system can ensure AMS-02 electronics system well function during its 3 years lifetime on ISS.