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Description
Double Quarter Wave (DQW) superconducting crab cavities will be employed to compensate for the vertical crossing angle in the High-Luminosity LHC (HL-LHC). Four DQW series cavities were manufactured and tested at the CERN vertical test facility. Each cavity undergoes a sequence of cold tests, starting from the bare cavity and progressing to the cavity in its final configuration, with all higher-order mode (HOM) couplers and the field antenna installed. This document presents the experience gained from RF cold test measurements of the first batch of DQW series cavities, with particular emphasis on measurements involving the HOM couplers. Challenges encountered during testing, such as limited field reach and the onset of field emission in two cavities equipped with HOM couplers, are also discussed.
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