Results of the Juelich Accelerator Module Based on Super-Conducting Half-Wave Resonators

In the context of upgrading the existing proton and deuteron accelerator facility COSY at the Forschungszentrum Juelich, an accelerator module based on superconducting cavities is prototyped. Two rf cavities have been delivered and extensively tested. The design of the cryostat was finished in 2004, the construction has started and the first cool-down of the module was scheduled for early summer 2005. This paper will review the design constraints, report the results obtained from the superconducting accelerator cavities and their ancillary parts (power coupler, tuner etc) and present the status of the almost finished work.