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Report No.
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Vacuum technologies in high-power proton accelerators

Kamiya, Junichiro   

Basic role of the vacuum systems in conventional particle accelerators is to maintain enough low pressure in the beam lines to guarantee the beam lifetime. In high power proton beam accelerators, the requirement for the vacuum system is much tougher due to the large size vacuum devices and high radioactivation. In addition, it is essential to pre-treat the vacuum materials in order to suppress pressure instability due to gas desorption from the vacuum wall originating from the large amount of the charged particles. Further, the rapid evacuation from the atmospheric pressure to the UHV after maintenance is also required to ensure the beam operation time. We aim to present the typical vacuum technologies in high power proton beam accelerator by introducing the vacuum system of J-PARC, especially of 3GeV rapid cycling synchrotron (RCS).

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