Upgrade of the profile monitors in the injection beam line of COSY

The injection beam line (IBL) of COSY consists of 4 straight and 4 bent sections. At the beginning and at the end of each bent section a wire array is used to measure the profile of the ion beam delivered by the cyclotron 'JULIC' to COSY. The 8 stations of wire array assemblies consist of a vacuum chamber holding arrays of each 39 wires for the two transversal planes. The profile data is used primarily to optimize the beam line transmission. Further maintenance of the old readout electronics is considered impractical. A decision was made to upgrade the readout system with a state of the art multichannel electronics, designed by iThembaLABS in South Africa. Each multichannel pico ammeter electronics is connected to one wire array. They measure currents at the wires being hit by the beam. A brief overview of existing methods of taking beam profile data is presented. Some technical aspects and the latest measurement results are discussed.