Development of CGEM Technology for Ultra-light Tracking Detectors: the KLOE-2 Inner Tracker

KLOE-2 at the Φ-factory DAΦNE of INFN Laboratori Nazionali di Frascati (LNF), is the first experiment using the GEM technology with a cylindrical geometry (CGEM), developed at the LNF by the Inner Tracker group and within the RD51 Collaboration. Four layers with 26÷41 cm diameters and L = 70 cm, each realized as a Triple-GEM detector, compose this new detector. To produce GEM foils of unprecedented size, the novel single-mask manufacturing procedure has been developed with the TE-MPE-EM CERN group, together with the realization of a novel XV readout pattern. The adopted solutions allowed the total material budget to be kept below 2% of the radiation length X0. The final assembly of the Inner Tracker has been completed on March 14, 2014. The production procedure will be reported together with the validation test results.