Contribution Oral presentation
Construction, commissioning and first data-taking of the Cylindrical-GEM KLOE-2 Inner Tracker
The KLOE-2 experiment aims to continue the successful program of KLOE, that collected 2.5 fb⁻¹ of integrated luminosity between 2001 and 2006 at DAΦNE, the φ-factory at the Frascati National Laboratory of INFN, fulfilling a vast set of precision kaon and hadron physics measurements. One of the major upgrades of the apparatus is the extension of the tracking system with the insertion of a central Inner Tracker (IT) inside the Drift Chamber. The IT is realized as four concentric cylindrical triple-GEM detectors, directly fixed onto the DAFNE beam pipe, at a distance from the interacion point going from 130 mm to 205 mm. The conception, design and realization of the cylindrical-GEM have been taken on in Frascati since 2007, with the goal of minimizing dead-spaces, support frames and material budget. The final result is a very light detector with an overall thickness corresponding to only 2% of a radiation length. Moreover the detector exploits the outstanding rate capability typical of the micro-pattern gas detectors, useful to cope with the unavoidable background of a high-luminosity e⁺e⁻ collider. The tracker provides space points with resolutions of 200 μm in rφ and 500 μm in z. The two coordinates are obtained by an XV strips patterned readout coupled to the GASTONE front-end, the 64 channels ASIC with digital output developed for the KLOE-2 experiment. In this talk we will give a comprehensive review of the construction procedures, the integration with the collider and the commissioning. Very preliminary measurements with cosmic muons and beam interactions will be shown as well. Extremely challenging problems have to be faced during these phases, lasted two years, that demanded for likewise advanced solutions.