Ceramic beam pipe for the TRIUMG KAON factory synchrotron rings

The sections of beam pipe passing through the magnets of the two fast cycling synchrotrons of the KAON Factory accelerator are to be constructed of alumina, thereby avoiding the eddy current problems which would otherwise arise if conventional metal pipes were used. An RF shield is required inside the nonconducting ceramic pipe to provide a low-impedance path for the image current of the circulating beam. Two schemes using different construction techniques for both the ceramic pipe and the internal RF Shield are described and compared. It is noted that the reference design of alumina beam pipe plus RF shield has operated reliably on ISIS for over seven years and can be regarded as a proven design. It is concluded that the integrated design could, with a little more development, offer an alternative at lower cost.<>