Turaj, K. Bastard, J. Calaga, R. Calvo, S.J. Capatina, O. Castilla, A. Chiodini, M. Duval, C. Edwards, A.V. Ferreira, L.M.A. Gourragne, M. Kohler, P. Montesinos, E. Pasquino, C. Pechaud, G. Stapley, N. Valverde Alonso, N. Walker, J.D. JACoW Publishing Geneva, Switzerland 2673-5504 978-3-95450-234-9 10.18429/JACoW-SRF2023-THIAA02 English 925-931 cavity HOM luminosity vacuum radiation Contribution to a conference proceedings 2023 2023-09 https://doi.org/10.18429/JACoW-SRF2023-THIAA02 https://jacow.org/srf2023/papers/thiaa02.pdf The LHC High Luminosity (HL-LHC) project includes, among other key items, the installation of superconducting crab cavities in the LHC machine. The Double Quarter Wave (DQW) crab cavity will be utilised to compensate for the effects of the vertical crossing angle. Two bare DQW series cavities were manufactured in Germany by RI Research Instruments and validated successfully at CERN through a cold test at 2K. Two DQW series cavities were produced in-house at CERN, integrated into a titanium helium tank, and equipped with RF ancillaries. This paper addresses the cavities preparation processes and summarizes the results of cryogenic tests of DQW cavities at CERN