New Developments at the Polarized Ion Source of COSY-JÜLICH

The polarized ion source, originally built by the universities of Bonn, Erlangen and Köln^{1 3}, is based on the colliding beams principle². The polarized source is in routine operation at the cooler synchrotron COSY⁵ after a redesign of major components. Inside COSY a polarisation of 70 % at maximum momentum was reached⁴. In recent experimental runs up to 2.5 × 10¹⁰ protons with a polarization of 86 % were stored at the injection momentum of 295 MeV/c in the cooler synchrotron. The intensity of the accelerated beam in the cooler synchrotron on an internal target exceeded 3.5 mA at a momentum of 3200 MeV/c.