Large-grain Superconducting Rf Cavities at Desy
نویسندگان
چکیده
The DESY R&D program on cavities fabricated from large-grain niobium explores the potential of this material for the production of approximately 1000 nine-cell cavities for the European XFEL. The program investigates both basic material properties, comparing large grain material to standard sheet niobium, and material availability, production, and preparation aspects. Several single-cell cavities of TESLA shape have been fabricated from large grain niobium. A gradient up to 41 MV/m at Q0 = 1.4·10 (TB = 2K) was measured after EP (electropolishing). Recently, the first three large-grain nine-cell cavities worldwide have been produced under a contract of DESY with ACCEL Instruments Co. The first cavity has already been tested with an accelerating gradient of 29 MV/m after BCP (Buffered Chemical Polishing) treatment. B
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