SIS100/300 Conceptual Design Studies

The main accelerator system of the proposed research facility FAIR is the two stage synchrotron complex SIS100/300, consisting of two separate synchrotron accelerators with equal circumferences. SIS100/300 shall provide beams of protons and heavy ions with high intensities and high energies. The existing GSI accelerators UNILAC and SIS18 shall serve as injector for SIS100/300. SIS100 will be designed for the acceleration of heavy ion beams, e.g. for U-ions with an intensity of up to 1·10, an energy range from 400 to 2715 MeV/u and one machine cycle every second. These beams of heavy and also of lighter ions will be used for the production of secondary beams of radioactive ions. SIS100 shall also accelerate high intensity proton beams with 2.8·10 protons per second for the production of intense antiproton beams. SIS300 will be used for the acceleration of fully ionized uranium ions (U) to very high energies up to 34 GeV/u. This energy has been raised above the CDR [1] value of 23.3GeV/u in the course of discussions with the scientific community, who prepares studies of condensed baryon matter (CBM). Hence the design value for the magnet bending power had to be increased from 200Tm to 300Tm at an unchanged circumference of 1083m. SIS300 will also be operated as a stretcher ring for high intensity heavy ion beams to provide almost 100% duty cycle during slow extraction.