Liu, Z.C. Gao, J. He, F.S. Jin, S. Mi, Z.H. Wang, F. Zhao, T.X. Zheng, H.J. Zhuang, D.H. JACoW Geneva, Switzerland 978-3-95450-191-5 10.18429/JACoW-SRF2017-TUPB033 English 451-453 TUPB033 cavity HOM ion GUI damping Contribution to a conference proceedings 2018 2018-01 https://doi.org/10.18429/JACoW-SRF2017-TUPB033 http://jacow.org/srf2017/papers/tupb033.pdf Slotted superconducting cavity is a novel structure with extremely low impedance and high BBU threshold. It can be used in various high current applications. A 1.3 GHz 3-cell slotted superconducting cavity was designed and tested. The room temperature test results show the cavity has an extremely low impedance. The vertical test results show the cavity gradient can reach several MV/m, but it was limited by the test end group made of steel.