Abstract
High accelerating fields at low rf power losses are needed for the ALPI superconducting booster currently under construction at Legnaro. Niobium sputtering onto 160 MHz OFHC Copper Quarter Wave resonators (QWRs) has been investigated in a Biased DC Diode configuration. Q-values of the order of 109 and accelerating fields over 6 MV/m at 7 Watt - that are far above ALPI specifications — are currently achievable with high reproducibility. Due to the high RF performances achieved and their reliability, sputtered QWRs will be installed into the ALPI high beta section.
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