Existing ring RF systems are in operation in the following accelerator facilities:

• Heavy Ion Synchrotron (German: "Schwerionensynchrotron") SIS18
• Experimental Storage Ring ESR
• CRYRING.

SIS18 RF Systems

• SIS18 MA Cavities
• SIS18 Ferrite Cavities 
• SIS18 Bunch Compressor

ESR RF Systems

• ESR Ferrite Cavity
• ESR Barrier Bucket Cavity