Illustration: Heavy-ion synchrotron SIS18 with sections Circumference: 216 m Maximum magnetic rigidity: 18 Tm
Accelerator ring - SIS (German: SchwerIonenSynchrotron): The from UNILAC pre-accelerated ion beam, is further accelerating in the heavy-ion synchrotron SIS up to 90 % of light speed (270.000 km/s) in a few hundred thousand revolutions.