The cryogenic vacuum system of SIS100 at FAIR

FAIR, Facility for Antiproton and Ion Research, is a new international accelerator facility for the research with antiprotons and ions. The accelerator complex will be built in Darmstadt (Germany) in cooperation with an international community of countries and scientists. The synchrotron SIS100 is the main working horse of the facility. This synchrotron, presently in its advanced planning phase at GSI, is designed for acceleration of high intensity, low charge state heavy ion and proton beams. The machine will have a circumference of about 1.1 km and utilise fast-ramped superconducting magnets. For this reason, about 80% of the whole beam pipe vacuum will be operated at cryogenic temperatures. In these cold sections, the cooling of the beam guidance magnets will be used simultaneously for cryopumping the beam pipes. We present an overview on the infrastructure of the cryogenic beam vacuum system of SIS100 and discuss some design details and special features.