The cylindrical-GEM inner tracker detector of the KLOE-2 experiment

摘要

The KLOE-2 experiment represents the continuation of KLOE. It acquired 5.5 fb~(-1) data from November 2014 to March 2018 with the aim of collecting the largest sample of φ mesons at the DAφNE e~+e~- collider at Frascati National Laboratory of INFN. A new tracking device, the Inner Tracker, was installed at the interaction region of KLOE-2 and it was operated together with the Drift Chamber to improve track and vertex reconstruction capabilities of the new experimental apparatus. The Inner Tracker is a four-layer cylindrical triple-GEM detector with each layer equipped with an X-V strips-pads stereo readout. Although GEM detectors have been extensively used in high energy physics experiments, the IT, with its fully-cylindrical geometry is a frontier detector and KLOE-2 is the first experiment which benefited of this novel detector technology operated at a collider. The operation of the Inner Tracker will be presented, together with the results of the alignment and calibration and tracking-vertexing performance of such a unique detector.