He, T.H. Xu, H. Zhou, K. Zhou, Z. JACoW Publishing Geneva, Switzerland 978-3-95450-265-3 10.18429/JACoW-SAP2023-MOPB030 English 70-72 gun cavity cathode electron coupling Contribution to a conference proceedings 2024 2024-11 https://doi.org/10.18429/JACoW-SAP2023-MOPB030 https://jacow.org/sap2023/papers/mopb030.pdf In recent years, the properties of new field emission materials have been gradually improved with the advancement of materials research fields, which have provided the possibility for the research and realization of cold cathode RF guns. A 0.32+1 cell S-band RF gun was designed based on the emission properties of carbon nanotube films and ultra nano diamond films. This article mainly introduces the selection of electron gun cavity, RF design and corresponding thermal analysis. The physical design results basically meet the design requirements.