Ma, W. Lu, L. Yang, L. JACoW Geneva, Switzerland 978-3-95450-191-5 10.18429/JACoW-SRF2017-TUPB041 English 481-483 TUPB041 ion cavity heavy-ion linac simulation Contribution to a conference proceedings 2018 2018-01 https://doi.org/10.18429/JACoW-SRF2017-TUPB041 http://jacow.org/srf2017/papers/tupb041.pdf A 325 MHz triple spoke type superconducting cavity for lead beams with β=0.3 is designed for the heavy ion inertial fusion (HIF) Demo facility. The design and simulations of the triple spoke will be reported in this paper, including the electromagnetic (EM) design and mechanical study using CST microwave studio (MWS) and ANSYS workbench.