范德华异质结热电子制冷技术驱动X射线管传热性能强化研究OA

Van der Waals(vdW)heterostructures have attracted much attention due to their distinctive optical,electrical,and thermal properties,demonstrating promising potential in areas such as photocatalysis,ultrafast pho-tonics,and free electron radiation devices.Particularly,they are promising platforms for studying thermionic emis-sion.It is illustrated that using vdW heterostructure-based thermionic emission can enhance heat transfer in vacuum devices.As a proof of concept,the approach is demonstrated to offer a promising solution for the long-standing overheating issue in X-ray tubes.Specifically,it is shown that the saturated target temperature of a 2000 W X-ray tube can be reduced from around 1200 ℃ to 490 ℃.Additionally,it is also demonstrated that by reducing the height of the Schottky barrier formed in the vdW heterostructures,the thermionic cooling performance can be en-hanced.The findings pave the way for the development of high-power X-ray tubes.