Bychanok, D. Bayev, V. Butenko, A.V. Gusarova, M. Huseu, S. Lalayan, M.V. Maksimenko, S.A. Nikiforov, D. Petrakovsky, V.S. Pokrovsky, A.I. Polozov, S.M. Shvedov, A. Sukhotski, A.E. Syresin, E. Vasilevich, E. Yurevich, S.V. JACoW Publishing Geneva, Switzerland 2673-5539 978-3-95450-240-0 10.18429/JACoW-RuPAC2021-MOPSA16 English 165-167 cavity vacuum cryomodule experiment cryogenics Contribution to a conference proceedings 2021 2021-10 https://doi.org/10.18429/JACoW-RuPAC2021-MOPSA16 https://jacow.org/rupac2021/papers/mopsa16.pdf Design of the prototype cryomodule for testing low-beta 325 MHz half-wave cavities is currently undergoing at INP BSU. The cryomodule allows performing intermediate vacuum-, temperature-, and rf-tests during the fabrication of half-wave resonators. The first experimental results of cryomodule cooling down to liquid nitrogen temperatures are presented and discussed. The pressure and temperature control allow us to estimate the main cooling/heating characteristics of the cryostat at different operation stages. The presented test cryomodule will be used for further development and production of superconductive niobium cavities for the Nuclotron-based Ion Collider fAcility (NICA) injector.