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In order to avoid the eddy-current effect due to a rapid-cycling magnetic field in the high-intensity proton synchrotron ring (300 m in circumference), several tens of ceramic chambers are to be installed. The 99.7% alumina ceramic ducts of 1-m long were sintered and braze jointed. A TiN film of 10 nm thick was formed inside the chamber for suppressing secondary electron emission, and electroformed copper stripes were plated outside. The course of the production process, including sintering, polishing, metallizing ceramics, and brazing them to the titanium flanges, is reported. Mechanical strength and vacuum performances are also examined. |