Evaluation results of aprototype vapor chamberforhigh heat flux

The heat generation density of spacecraft components increases with increasing the appli-cation of high-frequency devices, such as GaN amplifiers. In the amplifiers for broadcast sat-ellites, the heat flux density exceeds 50 W/cm^2 and the dissipate heat exceeds 200W. In order to thermal control these components, a thermal control device that can handle high heat flux with high conductance (low temperature drop) is required. The high heat flux is thermally dif-fused in a vapor chamber, then heat is conducted to the radiator through a loop heat pipe. The combination of these devices can also reduce the temperature drop from the device to the ra-diator. In this study, we prototyped two types of vapor chamber. Results confirmed that, when water was charged in a vapor chamber with an internal sintered wick structure, the total thermal resistance was about 0.125 K/W from the heat source (including the vapor chamber) to the cooling plate with a 200W heat load.