Two loop heat pipes (LHP) with parallel connection are used to cool the condenser of Alpha Magnetic Spectrometer 02(AMS-02).However
a series of factors lead to only one of LHPs primarily setting up and the other one failing to set up. The article established three-dimensional model of the LHP evaporator
used FLUENT to simulate its start-up temperature field. It is concluded that higher heat load facilitate start-up. Contact thermal resistance produced by structure or equipment difference can cause failure start-up. Finally
wick with primary and second wicks is better for start-up than wick of one single material.