The series DQW cavities manufactured at RI (eight cavities) and CERN (two cavities) have progressed significantly over the period of 2024-25. Two cavities, one from RI and one from CERN, were fully qualified with higher order mode (HOM) couplers in their final state well beyond the specification (4.7 MV) and sent to UK-STFC for cryostating the first series module (next section).
Two other cavities have undergone testing in their final state with HOMs and will conclude in quarter 2 of 2025. The remaining six series cavities were all welded during 2024. One of these cavities already reached the specification values and is being jacketed with a helium tank at RI. The rest of the cavities are at different stages and will be tested during 2025 and sent back to RI for jacketing.
Figure 2. DQW series bare cavities welded at Research Instruments.
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RF Dipole Cryomodule for SPS Tests (UK & CERN)