Pagani, C. Bertucci, M. Bignami, A. Bosotti, A. Chen, J.F. Michelato, P. Monaco, L. Paparella, R. Pirani, S. Sertore, D. JACoW Geneva, Switzerland 978-3-95450-191-5 10.18429/JACoW-SRF2017-TUPB070 English 547-552 TUPB070 cavity ion HOM coupling operation Contribution to a conference proceedings 2018 2018-01 https://doi.org/10.18429/JACoW-SRF2017-TUPB070 http://jacow.org/srf2017/papers/tupb070.pdf INFN-LASA is going to join the international partnership for Fermilab PIP-II project and to provide a novel design for the 650 MHz cavity of the 0.61 beta linac section, plug compatible with the Fermilab Cryomodule design. This paper reports the cavity design features both from the electro-magnetic and mechanical aspects, with focus on the rationales at the basis of the choice of main parameters. Furthermore, the current plans for the future R&D activity are here reported, including the production of two single cells and two complete cavities.