Experiences at the KEK B-factory vacuum system

As the vacuum system of the highest-luminosity collider in the world, the vacuum components of the KEK B-factory have experienced many great demands. The experience of the strong electromagnetic interaction between the vacuum components and a beam of charged particles led to the invention of a robust rf bridge (a comb-type bridge). Through an intensive study of the electron cloud problem in the positron ring, a sufficient set of mitigation technologies for a future high-current positron ring was established.