A SUPERCONDUCTING INJECTOR LINAC FOR COSY

For the Cooler Synchrotron COSY at the Research Center Jülich a superconducting linear accelerator will replace the existing cyclotron which presently serves as an injector for COSY. The new injector will have to deliver polarized H- ions and polarized D- ions for injection into COSY with an energy of at least 50 MeV. The number of particles accepted in COSY is to be risen up to the space charge limit, which is a significant improvement especially for polarized ions. The polarized ions will be generated in a colliding beams source with magnetic extraction and subsequent electrostatic deflection. After the RFQ stage (up to 2.5 MeV/u) the particles will be fed into the LINAC section which consists of about 44 independently phased super-conducting 2-gap resonators. The ions are finally guided to the COSY injection point. The main characteristics of the LINAC operation will be 2 mA peak current, 2 Hz repetition rate, 500 us ion source pulse length. A facility description is given and designs are discussed. The status of the project is reported.