KEK, Ibaraki
Tokyo Denkai Co., Ltd., Tokyo
The promising cavity performance has been confirmed on the niobium large grain cavity at many laboratories: Jlab, DESY, and IHEP/KEK in last 4 years R&D. The gradient over 35MV/m can be expected. The niobium materials for these cavity fabrications were sliced by EDM or combination of sawing and surface machining, which are rather expensive and no way for massive production like ILC. We have developed multi-wire slicing method applying silicon wafer technology. This technology could produce 150 circular sheets in 45 hrs with very smooth surface. So far we demonstrated 60 sheets slicing in 45hrs. Next 100 sheets slicing is under way. In this talk we will present the results and some result on the cavity test fabricated this slice materials.
