Superconducting RF-Cavities for a 30-GeV PETRA Storage Ring

The installation of superconducting rf-cavities offer the possibility to increase the beam energy of the PETRA storage ring to 30 GeV. To investigate the large scale use of superconducting rf technology a prototype cryogenic module compatible with space requirements in the PETRA tunnel is developed. The cryostat has a length of 4.2 m and contains two 9 cell 1 GHz structures of elliptical shape. Rectangular and capacitive loaded circular waveguides are explored for high power input and higher mode output couplers.