Challenges to the vacuum system in high intensity accelerators

Kamiya, Junichiro   

This workshop intends to an activation of vacuum science field thorough talks of young scientists, who are concerning themselves in the vacuum technology, surface, thin films, and so on. My talk will be based on my own experiments, which are cultivated though works in J-PARC and CERN. The abstract is following. High power beam is one of the mainstreams of the particle accelerators. Characteristics of vacuum systems in accelerators are their large dimensions, existence of beam, radiation circumstances. These characteristics are not independent. And therefore in high power accelerators, there are many functions, which related to the vacuum are broad. In my talk, I intend to show the importance and appeals of the vacuum in high power accelerators through experimental results of vacuum apparatus, to which I actually related, such as a J-PARC kicker magnet, a large aperture titanium chamber, a vacuum chamber of high magnetic permeability, and a CERN collimator.