Li, X. Pu, Y.H. Xie, X.C. Yang, F. Zhao, M.H. JACoW Publishing Geneva, Switzerland 2226-0366 978-3-95450-194-6 10.18429/JACoW-LINAC2018-MOPO079 English 163-166 MOPO079 cavity DTL proton linac focusing Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-LINAC2018-MOPO079 http://jacow.org/linac2018/papers/mopo079.pdf An Interdigit H-mode Drift-Tube-Linac (IH-DTL) with Alternating-Phase-Focusing (APF) method working at 325MHz was designed. With the RF field established properly in the cavity, protons can be accelerated from 3MeV to 7MeV successfully. In this paper, the process of designing such an APF IH-DTL cavity is going to be presented. Also, the characteristics of the cavity and pa-rameters studying of RF are going to be demonstrated.